Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
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Volume 63, Issue 11
Displaying 1-50 of 51 articles from this issue
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  • Extending the Hamiltonian Structures and New Integrable Systems
    Chandana Ghosh, A. Roy Chowdhury
    Subject area: Mathematical methods in physics.
    1994 Volume 63 Issue 11 Pages 3911-3913
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.3911
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    By starting with the known Hamiltonian structure of integrable systems, it is shown how extended Hamiltonian operators can be constructed using the conditions deduced by Dorfman for an operator to be symplectic and Hamiltonian. Such extended operators are seen to generate new and coupled integrable systems.
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  • Vortical Structures in Homogeneously Sheared Turbulence Subjected to Background Rotation
    Mitsuru Tanaka
    Subject area: Electricity and magnetism: fields and charged particles.
    1994 Volume 63 Issue 11 Pages 3914-3918
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.3914
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    The homogeneously sheared turbulence subjected to a background rotation that cancels the shear vorticity is investigated numerically. The vortex structures that appear in the rotating flow are only longitudinal vortex tubes which are highly elongated in the streamwise direction. The vertical components of fluid velocity and particle diffusion are activated compared with spanwise components, reflecting the arrangement of the vortical structures, which leads to a large particle diffusion in the streamwise direction as well.
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  • Pattern Formations in Unstable Network: Model for Cross-Linked Polymer Chains
    Hiroshi Furukawa
    Subject area: Structure of liquids and solids; crystallography.
    1994 Volume 63 Issue 11 Pages 3919-3922
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.3919
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    We propose a model of an unstable chain network to study the pattern formation of cross-linked polymer blends in the thermodynamically unstable state. When the instability is triggered by a small number of point triggers, target patterns emerge. As time proceeds each concentric ring separates into several parts, but the overall image of the target pattern is maintained. Such patterns are frozen-in.
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  • Quasiparticles in Two-Dimensional Hubbard Model: Splitting of Spectral Weight
    Hidetoshi Fukuyama, Masao Ogata
    Subject area: Electron states in condensed matter.
    1994 Volume 63 Issue 11 Pages 3923-3926
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.3923
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    It is shown that the energy (ε ) and momentum (k) dependences of the electron self-energy function ∑ , (k, , ε +i0)≡ ∑ R, (k, , ε ) in two-dimension are Im, ∑ R, (k, , ε )=-aε 2| ε -ξ k| -γ (k), where a is some constant, ξ k=ε (k)-μ, ε (k) being the band energy, and the critical exponent γ (k), which depends on the curvature of the Fermi surface at k, satisfies 0≤ γ (k)≤ 1. This leads to a new type of electron liquid, which is the Fermi liquid in the limit of ε, ξ k→ 0 but for ξ k≠ 0 has a split one-particle spectra, as in the Tomonaga-Luttinger liquid.
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  • Volume Dependent Grüneisen Parameter in the Heavy Fermion Compound CeInCu2
    Tomoko Kagayama, Gendo Oomi, Eiji Ito, Yoshichika Ohnuki, Takemi Komat ...
    Subject area: Electron states in condensed matter.
    1994 Volume 63 Issue 11 Pages 3927-3930
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.3927
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    Electrical resistance of the heavy fermion compound CeInCu2 has been measured at high temperatures up to -- 1000, K and pressures to 8, GPa. The resistance-maximum temperature Tmax increases rapidly with increasing pressure, associated with an enhancement of the Kondo temperature TK. The volume dependence of the TK and the Grüneisen parameter Γ is discussed quantitatively.
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  • Giant Magnetotransport Phenomena in Filling-Controlled Kondo Lattice System: La1-xSrxMnO3
    Yoshinori Tokura, Akira Urushibara, Yutaka Moritomo, Takahisa Arima, A ...
    Subject area: Electron states in condensed matter.
    1994 Volume 63 Issue 11 Pages 3931-3935
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.3931
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    Giant magnetotransport phenomena including the field-induced nonmetal-metal transition have been found in single crystals of La1-xSrxMnO3 near the critical composition (x≈ 0.17) for the nonmetal-metal transition and in the temperature region around the magnetic phase transition. Change of the resistivity shows a universal curve as a function of the magnitude of temperature- or field-induced magnetization, the most of which agrees with the prediction by the D=∞ and S=∞ Kondo lattice model with strong ferromagnetic (Hund) coupling.
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  • Mixing-Type Quadrupolar Order on Γ7-Doublet in TmTe
    Tadao Kasuya
    Subject area: Electron states in condensed matter.
    1994 Volume 63 Issue 11 Pages 3936-3940
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.3936
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    Detailed experimental results on TmTe have been analyzed critically and the following novel characteristics have been revealed. The crystal field levels are different from the Γ8 ground state proposed before but have the sequence of Γ7, Γ8 and Γ6 with the Γ7 ground state, and a novel mixing-type quadrupolar order is developed at 2, K on the Γ7 doublet with a weak intensity, followed by a strong antiferromagnetic order at 0.5, K. All the anomalous properties are explained consistently.
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  • Observation of Strong Magnetic Circular Dichroism of\ `Nonmagnetic' Y3+ Core Transition in Ferrimagnetic YIG Lattice
    Kazutoshi Yagi, Masatada Yuri, Hideo Onuki
    Subject area: Electron states in condensed matter.
    1994 Volume 63 Issue 11 Pages 3941-3944
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.3941
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    Magnetic circular dichroism (MCD) of Y3Fe5O12 (YIG) was measured in the vacuum ultraviolet region between 22, eV and 40, eV by use of a polarizing undulator with crossed and retarded magnetic fields. Strong MCD features were observed for the inner core transitions of Y3+ from the 4p6 to 4p5(4d+5s) levels, even though its ground state has J=0. It is suggested that the `nonmagnetic' Y3+ ion in a ferrimagnetic YIG lattice has an induced magnetic moment on the order of 0.01, μ B/ion.
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  • Sampling Ground-State Configurations of a Peptide by Multicanonical Annealing
    Ulrich H. E. Hansmann, Yuko Okamoto
    Subject area: Materials science.
    1994 Volume 63 Issue 11 Pages 3945-3949
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.3945
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    We test a variant of the multicanonical method, multicanonical annealing, to determine the ground-state configuration of biological molecules. As a simple example, we study Met-enkephalin, one of the simplest peptides. Our results are compared with those of simulated annealing.
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  • Correlation Length for the XXZ Spin Chain at Finite Temperature
    Hideyuki Mizuta, Taro Nagao, Miki Wadati
    Subject area: Mathematical methods in physics.
    1994 Volume 63 Issue 11 Pages 3951-3961
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.3951
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    Baxter's formula is extended to treat the thermodynamic properties of quantum spin chains. As an application of such formulation which we call finite temperature Baxter's formula, the XXZ Heisenberg spin chain is investigated. Combination of the formula and the finite size expansion provides a systematic method to evaluate low-temperature expansions of the thermodynamic quantities. The correlation length for the XXX spin chain is explicitly evaluated.
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  • Gauge Transformations among Generalised Nonlinear Schrödinger Equations
    Masato Hisakado, Miki Wadati
    Subject area: Mathematical methods in physics.
    1994 Volume 63 Issue 11 Pages 3962-3966
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.3962
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    The gauge transformations for (n+1)× (n+1) eigenvalue problems are introduced. In particular, extended forms of Ablowitz-Kaup-Newell-Segur (AKNS) system and Kaup-Newell (KN) system are found to be related by the gauge transformation. As an application of this theory, the interrelations between the coupled nonlinear Schrödinger equation and the coupled derivative nonlinear Schrödinger equation are explicitly shown.
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  • The Wigner Transform of Soliton Solutions for the Nonlinear Schrödinger Equation
    Hidetoshi Konno, Peter S. Lomdahl
    Subject area: Mathematical methods in physics.
    1994 Volume 63 Issue 11 Pages 3967-3973
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.3967
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    The Wigner function, a kind of wavelet transform is studied for one- and two-soliton solutions to the nonlinear Schrödinger equation. The exact expression of the Wigner transform for the one-soliton solution is obtained. The features of soliton-soliton interaction of different two-soliton states, the states of coherence analogous to that of two-localized wave packets in quantum mechanics, are displayed. Suitability of this transform for analyzing “soliton” in open systems is also discussed.
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  • On the Theory of the Two-Dimensional Heisenberg Antiferromagnet with Frustration on a Square Lattice
    A. F. Barabanov, V. M. Beresovsky
    Subject area: Mathematical methods in physics.
    1994 Volume 63 Issue 11 Pages 3974-3982
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.3974
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    The two-dimentional frustrated S=1/2 Heisenberg antiferromagnet is studied with a Green function decoupling method in a spherical approach. The second order phase transition from long-range order state to spin liquid state is found at λ =J2/J1=0.12 where J1, J2 describe the nearest and next nearest neighbors antiferromagnetic interaction. The temperature dependence of correlation functions Cρ , spin spectrum gap and uniform susceptibility χ is presented before and after transition. The dependence of χ on λ and T turns out close to the dependence of χ on doping parameter x and T in high-Tc superconductors. The discussion points out the importance of detailed dependence of Cρ on T and λ for the hole spectrum of doped CuO2 plane.
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  • Competing Bond Alternations in Spin-1/2 Quantum XY Chain
    YÔhei Saika
    Subject area: Mathematical methods in physics.
    1994 Volume 63 Issue 11 Pages 3983-3991
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.3983
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    We propose an exactly solvable model which has numerous low-lying excited states and the dispersionless zero energy mode, by introducing the competing bond alternations into the spin-1/2 quantum XY chain. We clarify the mechanism of the double peak in the temperature dependence of the specific heat and the residual entropy as follows; (1) Numerous low-lying excited states generate the double peak of the specific heat. (2) As an exception, only at the most competing points the double peak in the specific heat disappeares but the macroscopic residual entropy arises in the ground state. (3) If the competition is not so strong, the specific heat has a single peak.
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  • Note on the Contribution of Relativity to Cu2 Bonding
    Jun Onoe, Hirohide Nakamatsu, Rika Sekine, Takeshi Mukoyama, Hirohiko ...
    Subject area: Electronic structure of atoms and molecules: theory.
    1994 Volume 63 Issue 11 Pages 3992-3995
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.3992
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    We have studied relativistic effects on chemical bonding in Cu2 dimer by using the nonrelativistic and relativistic discrete-variational Xα molecular orbital calculations. The present work has shown that the relativity nontribution to the Cu2 bonding is extremely small, in a similar manner to the previous result by Pélissier [J. Chem. Phys. 79 (1983) 2099]. Although the effect of relativity is very small, this effect makes the Cu2 bonding weak slightly, in contrast to the previous results by Bauschlicher et al. [J. Chem. Phys. 76 (1982) 6015] and Martin et al. [J. Chem. Phys. 78 (1983) 5840, Chem. Phys. Lett. 113 (1985) 451].
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  • Excitation of the 3s3p6 State of Ar+ by Electron Impact
    Seiji Tsurubuchi, Tatsunori Miyazaki, Kenji Motohashi
    Subject area: Electronic structure of atoms and molecules: theory.
    1994 Volume 63 Issue 11 Pages 3996-3999
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.3996
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    Emission cross section was measured for the 3s3p6→ 3s23p5 transition of Ar+ by electron impact in the energy range from the threshold to 1000, eV. The result obtained is (5.19± 0.93)× 10-18, cm2 for the 91.98, nm line and (2.64± 0.58)× 10-18, cm2 for the 93.21, nm line at 200, eV.
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  • Vorticity Generation by Shock-Vorticity Interaction
    Hideaki Miura, Shigeo Kida
    Subject area: Electricity and magnetism: fields and charged particles.
    1994 Volume 63 Issue 11 Pages 4000-4010
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4000
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    The mechanism of vorticity generation by shock-vorticity interaction is investigated by means of direct numerical simulation of a compressible fluid and an analysis using the Rankine-Hugoniot jump relation. The generation of vorticity caused by a passage of a shock wave is confirmed numerically by comparing the vorticity on the front and the back sides of the shock. In order to explain the generation mechanism, the amount of vorticity generated from a uniform flow on crossing a curved shock is estimated using the Rankine-Hugoniot jump relation. It is shown that vorticity is generated tangentially to the curved shock wave through the baroclinic torques.
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  • Equilibrium Configuration and Average Beta Values in a Reversed Field Pinch
    Katsuji Chiyoda
    Subject area: Kinetic and transport theory of fluids; physical properties of gases.
    1994 Volume 63 Issue 11 Pages 4011-4016
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4011
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    An equilibrium configuration of a reversed field pinch (RFP) plasma is derived by a model with the plasma pressure and the toroidicity. This configuration is a generalization of the force-free field. The flux function in this model, which vanishes on the plasma-shell interface, is expressed by the Bessel function of the first kind of order 0. The shift of the center of the flux surface from the center of the torus is obtained. The poloidal and total beta-values averaged over the cross section of the plasma column are also obtained. The theoretical results obtained here seem to be able to interpret the experimental results available at the present time.
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  • Ion Orbit Loss near Plasma Edge in Tokamak with Diverter Configuration
    Kenro Miyamoto
    Subject area: Kinetic and transport theory of fluids; physical properties of gases.
    1994 Volume 63 Issue 11 Pages 4017-4026
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4017
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    Analytical expression for the condition of ion orbit loss near the plasma edge of tokamak with diverter configuration is derived by use of drift orbit approximation. This simple expression can reproduce the result previously obtained by numerical calculation of ion drift orbit in JET configuration.5) The effect of radial electric field on ion orbit loss ion is systematically studied by use of this analytical exression. It is shown that, if the initial position of a test ion is outside the torus, the ion orbit loss does not necessarily decrease even by increase of the inward electric field. Ion orbit near X point is analyzed and striking positions of orbit loss ions on the diverter plate is examined.
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  • Radial Density Distributions in a Magnetized Electronegative Gas Positive Column
    Michio Matsumoto, Kazuo Sakai
    Subject area: Kinetic and transport theory of fluids; physical properties of gases.
    1994 Volume 63 Issue 11 Pages 4027-4034
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4027
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    A long positive column with negative ions is kept in a longitudinal magnetic field B. The negative ions are present of the same order amount as the electrons. The three species charged particles are treated to be distributed axially symmetric and uniform along the tube axis. Those particle distributions in the radial direction are numerically analyzed. The results so obtained are shown graphically as a parameter of the strength | B| at some given ratios g0 of negative ion's density to electron's at the axis. The distribution profiles are contracted more than the J0-distribution in inert gas discharges.
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  • The Diffraction Pattern of a Non-Bravais-Type Quasicrystal with Application to a Decagonal Quasicrystal
    Komajiro Niizeki
    Subject area: Structure of liquids and solids; crystallography.
    1994 Volume 63 Issue 11 Pages 4035-4043
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4035
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    There exists a duality in the structure between a non-Bravais-type quasilattice and its Fourier transform. The diffraction pattern of a quasicrystal modelled by the quasi-lattice is dominated by this structure of the Fourier transform and its reflections are classified into main reflections and several groups of satellite reflections depending on the symmetries in the reciprocal space of the reciprocal-lattice vectors of the reflections. The theory is developed with application to the order-disorder transformation of a decagonal quasicrystal.
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  • A Neutron Diffraction Study on the Deuteration Effect in CsH2PO4 Crystal
    Yutaka Iwata, Kiyoshi Deguchi, Shigeshi Mitani, Iwao Shibuya, Yoshitak ...
    Subject area: Structure of liquids and solids; crystallography.
    1994 Volume 63 Issue 11 Pages 4044-4050
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4044
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    The deuteration rate x of partially deuterated crystals, Cs(H1-xDx)2PO4, was determined through the neutron diffraction experiment. It was found that two non-equivalent positions of hydrogen atoms take slightly different deuteration rates. The deuteration rate x1 of the shorter hydrogen bond which is closely related to the ferroelectric phase transition is smaller than the rate x2 of the longer one. The observed dependence of the phase transition temperature Tc on x1 is found to be linear in contrast to the concaved dependence predicted in the one-dimensional proton-pseudospin coupled model. The neutron diffraction experiment also revealed that the distance of the shorter hydrogen bond increased linearly with x1, whereas that of the longer one remained constant.
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  • Towards Generalization of Ewald Sum
    Kazuhiro Fuchizaki
    Subject area: Structure of liquids and solids; crystallography.
    1994 Volume 63 Issue 11 Pages 4051-4059
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4051
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    A procedure is discussed concerning numerical lattice sums of quantities characterized by inverse power law and modulation wave vector. A relatively simple formula for the sum is derived for odd-dimensional lattice but for arbitrary power, modulation wave vector as well as lattice structure, which includes the sum of such as the Ruderman-Kittel-Kasuya-Yosida and the Friedel interactions as one of the special cases.
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  • Raman Scattering of CuGeO3
    Masayuki Udagawa, Hiroaki Aoki, Norio Ogita, Osamu Fujita, Akio Sohma, ...
    Subject area: Structure of liquids and solids; crystallography.
    1994 Volume 63 Issue 11 Pages 4060-4064
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4060
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    Polarization and temperature dependence of Raman scattering spectra of CuGeO3 has been measured from room temperature to 5, K. The observed phonons at room temperature are well assigned by the group theoretical estimation for Pbmm(D52h). The qualitative change for all possible Raman scattering spectra has not been found from room temperature to 14, K. The energy of the five inter-chain phonons increases with decreasing temperature. Below spin-Peierls transition temperature Tsp(=14, K), five peaks at 27, 107, 230, 370, and 820, cm-1 have been observed for the (c, , c) geometry while the peaks at 370 and 820, cm-1 appear for (b, , c).
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  • Far Infrared Transmission Measurements of R2Cu2O5 (R=Y, In, Lu and Sc)
    Hitoshi Ohta, Kazuaki Kuro–oka, Takao Nanba, Shojiro Kimura, Mit ...
    Subject area: Structure of liquids and solids; crystallography.
    1994 Volume 63 Issue 11 Pages 4065-4069
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4065
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    Far infrared transmission measurements of R2Cu2O5 (R=Y, In, Lu and Sc), which show strange two metamagnetic transitions below TN, have been performed in the energy region from 50 to 200, cm-1 at 4.2, K. Observed phonon energies are compared with each other, and their phonon modes are discussed.
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  • Simple Method of Calculating Grüneisen Parameter Based on the Shock Hugoniot Data for Solids
    Kunihito Nagayama, Yasuhito Mori
    Subject area: Structure of liquids and solids; crystallography.
    1994 Volume 63 Issue 11 Pages 4070-4077
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4070
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    This paper presents a novel way of calculating Grüneisen parameter for previously proposed three theoretical models. The present method provides a simplified and reliable way of estimating Grüneisen parameter for high-pressure states for solids. A new variable is defined, and integration of the differential equation for Grüneisen parameter is carried out along the shock Hugoniot curve. The available Hugoniot compression curve for the material are all that is required for calculation. Instead of the established but complicated procedure of Grüneisen parameter estimation, a simple and efficient algorithm of calculation has been developed. Numerical examples have been given for various materials, and general discussion for the behavior of Grüneisen parameter has been made.
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  • Analysis of Conductivity Data of KSnOPO4 (KSP) Single Crystal
    Hiroyuki Yanagisawa, Hiroshi Orihara, Yoshihiro Ishibashi
    Subject area: Structure of liquids and solids; crystallography.
    1994 Volume 63 Issue 11 Pages 4078-4081
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4078
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    The measured conductivity of KSnOPO4 (KSP) single crystals in the range from 100, Hz to 1, MHz in our previous work depends on frequency, but this dependence is considered to be due to the influence of the displacement current. It is shown that the analysis of the conductivity data of KSP, containing contributions both from the ionic conduction and the displacement current, can well explain the frequency and temperature dependences of the conductivity.
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  • Electronic Structures and Absorption Spectra of II-VI Compound Strained-Layer Superlattices
    Satoshi Hohnoki, Shin–ichi Katayama, Akira Hasegawa
    Subject area: Electron states in condensed matter.
    1994 Volume 63 Issue 11 Pages 4082-4096
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4082
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    Electronic structures and absorption spectra for direct valence-band-to-conduction-band transitions in ZnSe--ZnS and ZnTe--ZnSe strained-layer superlattices, which have recently attracted interest for an application to optoelectronic devices, are studied theoretically. The calculations of the electronic states near the band edges are carried out by using the Kronig-Penney model in the Luttinger-Kohn Hamiltonian. The calculated absorption spectra are decomposed into each transition component, examined in connection with the mixing of heavy- and light-hole states in detail, and compared with the experimental results. Overall features of the absorption spectra observed recently by Shen et al. are explained reasonably well. For ZnSe--ZnS, it is predicted that a drastic change in the absorption spectrum may occur by changing the incident-photon polarization, and for ZnTe--ZnSe a similar property will be observed, if samples with a thicker barrier layer are studied.
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  • Valence Band Density of States of the Iron Silicides Studied by Soft X-Ray Emission Spectroscopy
    Megumi Kasaya, Shoichi Yamauchi, Masaaki Hirai, Masahiko Kusaka, Motoh ...
    Subject area: Electron states in condensed matter.
    1994 Volume 63 Issue 11 Pages 4097-4101
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4097
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    Electron excited Si-L2, 3 valence band soft X-ray emission spectra for α -FeSi2 and β -FeSi2 have different spectral shapes each other, and showed modifications from that for a Si single crystal. From the study of these spectra in comparison with the existing theoretical study, it is concluded that these spectral shapes reflect electronic states due to their own coordinations of atoms. For the β -FeSi2, it is also concluded that the Si-d valence band density of state is included in the upper part of the valence band density of states.
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  • On the Formation of an Optical Mode Induced Single Centre Bi-Polaron
    S. Sahoo, T. K. Mitra
    Subject area: Electron states in condensed matter.
    1994 Volume 63 Issue 11 Pages 4102-4109
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4102
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    The single centre strong coupled bipolaron is studied by a combination of canonical transformation and second order Rayleigh-Schrödinger perturbation theory. It is shown that in the lowest order of perturbation the Pekar result is essentially recovered. The next order of perturbation, in the harmonic approximation, produces the stability criterion on η =ε ∞ /ε which compares well with those available in the literature. The strong coupling bipolaron energy, with the leading term proportional to α 2, is found to be of the form -Aα 2-B+O(1/α 2) where A and B are explicitly calculated.
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  • ESR Properties of κ -Type Organic Superconductors Based on BEDT-TTF
    Toshikazu Nakamura, Tomoko Nobutoki, Toshihiro Takahashi, Gunzi Saito, ...
    Subject area: Electron states in condensed matter.
    1994 Volume 63 Issue 11 Pages 4110-4125
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4110
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    A systematic investigation of electron spin resonance (ESR) properties, the spin susceptibility (χ spin), peak-to-peak linewidth (ΔHpp) and g-value, of κ -type BEDT-TTF superconductors has been carried out in order to clarify their electronic structures in the normal state. κ -(BEDT-TTF)2Cu[N(CN)2]Br (Space group: Pnma) and κ '-(BEDT-TTF)2Cu2(CN)3 (P21/c) have almost temperature independent g-values along all the crystal axes. On the other hand, the salts with space group of P21, κ -(BEDT-TTF)2Cu(NCS)2, κ -(BEDT-TTF)2Cu(CN)[N(CN)2] and κ -(BEDT-TTF)2Ag(CN)2· H2O, were found to show an anomalous enhancement of g-shift below about 130, K when the field was applied along the b axis in the two-dimensional conducting plane. Simultaneously, a rapid broadening of the linewidth has been observed. We discuss possible mechanisms of the anomalous temperature dependence of the g-value for the compounds of the P21 space group.
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  • Transition Temperatures in Cuprate Superconductors on the Basis of d-p Model
    Takashi Hotta
    Subject area: Electron states in condensed matter.
    1994 Volume 63 Issue 11 Pages 4126-4143
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4126
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    On the basis of d-p model, both normal and anomalous self-energies are calculated perturbatively up to third order with respect to the Coulomb repulsion U between d-electrons at a Cu site. The superconducting transition temperature Tc is obtained as a function of d- and p-hole numbers by the solution of the Dyson-Gor'kov equation. In the over-doped region, Tc decreases with the increase of the total hole number δ . This experimentally obtained behavior of Tc is successfully reproduced. In the under-doped region, Tc decreases rapidly with the decrease of δ experimentally. Such a rapid change of Tc is not obtained in our calculation, but it is found that Tc is almost independent of δ by the suppression due to the vertex corrections.
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  • Magnetic Susceptibility of Liquid Pb--Se and Sn--Se Alloys
    Satoru Ohno, Tatsuya Okada, Takashi Uehara
    Subject area: Electron states in condensed matter.
    1994 Volume 63 Issue 11 Pages 4144-4154
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4144
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    The dependence of the magnetic susceptibility on concentration for liquid Pb--Se and Sn--Se alloys exhibited a sharp minimum with a large negative value at thestoichiometric composition, PbSe and SnSe, respectively. Reasonable values of diamagnetic susceptibility on the Se-rich side can be obtained from the relationship between magnetic susceptibility and conductivity. The paramagnetic susceptibility obtained on the metal-rich side can be explained by the decrease in the density of states at the Fermi level and the increase in the enhancement factor with increasing Se composition. The sharp minimum in the concentration dependence of magnetic susceptibility is attributed to the enhancement of diamagnetic susceptibility due to the ion cores and the relatively small value of paramagnetic susceptibility due to the conduction electrons at the stoichiometry.
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  • Itinerant Ferromagnetism in Nickel
    Takuya Okabe
    Subject area: Electron states in condensed matter.
    1994 Volume 63 Issue 11 Pages 4155-4162
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4155
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    To study the origin of the ferromagnetism in metallic nickel, triply-degenerate bands with 0.6 hole per site are treated in the Gutzwiller procedure, where experimentally deduced values for the on-site effective interaction energies are used. We adopt the mechanism that the Hund's-rule coupling effect combined with the hole migration process works for alighning their spin moments ferromagnetically. Owing to the screening effect of conduction electrons, the energy of the triplet configuration of the d8 polar state is reduced to be buried in the d-bands. So the triplet state can be realized more frequency than the singlets. As a result, it is found, the itinerant ferromegnetism in nickel originates from the hopping process which involves the polarization. In the paramagnetic stste, this process is restricted more by the intraatomic correlation effect than in the ferromagnetic state. The condition requisit for realizing the ferromagnetic ground state is shown. Given also are the band-width narrowing factor and the weight of doubly occupied sites for the ferromagnetic ground state.
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  • Nonlinear Pressure Dependences of the Ferrimagnetic Curie and the Ferrimagnetic-to-Antiferromagnetic Transition Temperatures in (Cr1-xTix)5S6
    Kazuo Hatakeyama, Satoru Ohta, Takejiro Kaneko, Hajime Yoshida, Shunya ...
    Subject area: Electron states in condensed matter.
    1994 Volume 63 Issue 11 Pages 4163-4168
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4163
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    The ferrimagnetic Curie temperature (Tc) and the ferrimagnetic-to-antiferromagnetic transition temperature (Tt) in (Cr1-xTix)5S6(0≤ x≤ 0.15) were investigated up to 14, kbar. It is revealed that Tc decreases nonlinearly with increasing pressure (P) and that Tt also decreases at high pressures. The ratio Tt(P)/Tc(P) increases with increase in P. These nonlinear pressure dependences of Tc(P) and Tt(P) are qualitatively discussed on the basis of the band structure calculation for CrS in which the stability of antiferromagnetic states is determined by Cr3dz2-Cr3dz2 and Crd-Sp interactions. Important role of Crd-Sp hybridization on the pressure effect is suggested.
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  • Itinerant-Localized Duality Picture of Spin Fluctuations in High-Tc Cuprates. II. A Unified Phenomenology
    Osamu Narikiyo, Kazumasa Miyake
    Subject area: Electron states in condensed matter.
    1994 Volume 63 Issue 11 Pages 4169-4175
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4169
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    We present a phenomenology of spin fluctuations in the normal metallic state of high-Tc cuprates where the dynamical spin susceptibility resulting from the mode-mode couplings of the itinerant fermions and the localized spins consists of two parts: the coherent and the incoherent ones. The long-standing paradoxes on the experiments of the neutron scattering and the NMR, concerning the magnetic correlation length and the longitudinal and the transverse NMR relaxation rates, are resolved and the nature of the spin gap for these quantities is clarified.
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  • 27Al-NMR and NQR Studies in the Antiferromagnetic Heavy Fermion CePd2Al3
    Hideki Tou, Yoshio Kitaoka, Kunisuke Asayama, Sjoerd A. M. Mentink, Ge ...
    Subject area: Electron states in condensed matter.
    1994 Volume 63 Issue 11 Pages 4176-4185
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4176
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    Systematic measurements of the NQR spectrum and the nuclear-spin-lattice relaxation rate, 1/T1, of 27Al in the heavy-fermion antiferromagnetic (AF) compound CePd2Al3 have revealed that the magnetic nature dramatically changes from showing long-range and inhomogeneous AF ordering for annealed and as-cast polycrystals, respectively, to a disappearance of any type of magnetic ordering for single crystals. A close relationship between the magnetic ordering and the structural disorder in the Al layers isolated from the Ce--Pd layers is demonstrated. The exchange coupling via the Al layers along the c-axis, which leads to the AF ground state, critically depends on the occupation and distribution of Al atoms as proposed by Mentink et al. It is pointed out that the randomness remaining inevitably in the Al layers masks the intrinsic magnetic excitation in the AF ordered state.
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  • Dielectric Behavior and Collective Excitation of an Electron Gas on a Tubule
    Osamu Sato, Yukio Tanaka, Michisuke Kobayashi, Akira Hasegawa
    Subject area: Electron states in condensed matter.
    1994 Volume 63 Issue 11 Pages 4186-4194
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4186
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    The dielectric property of an electron gas confined to the surface of the cylinder is investigated in the random phase approximation. The frequency dependence of the dielectric function shows a dimensional crossover from two- to one-dimensional behavior with decreasing the cylinder radius. In this model, the Fourier transform of the Coulomb potential is exactly performed. The plasma dispersion relation at long wavelengths is derived by considering the polarizability that comes from both intraband and interband transitions. It is shown that the intraband plasma dispersion agrees with that of the quantum wires. The dielectric function of the two-dimensional electron gas is also derived analytically from that of the electron gas on the cylinder surface.
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  • Dielectric Study on the Low-Temperature Phase Transition of TlH2PO4
    Jong–Ho Park, Kwang–Sei Lee, Jeong–Bae Kim, Masaru K ...
    Subject area: Electron states in condensed matter.
    1994 Volume 63 Issue 11 Pages 4195-4199
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4195
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    The dielectric constant along the b-axis, ε 'b, of TlH2PO4 has been measured in detail in the frequency range from 1, kHz to 1, MHz around the II-III transition temperature TL. The dielectric constant shows slightly discontinuous anomalies at TL, C=228.7± 0.1, K on cooling and TL, H=229.7± 0.1, K on heating. The thermal hysteresis of 1, K and discontinuous change of the dielectric constant at TL indicate that the II-III phase transition is of the first-order. The frequency dependence of TL and the appreciable dielectric dispersion were not observed above and below TL.
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  • Universal Scaling Behavior of Dielectric Dispersion and Its Breakdown in Glycerol, Propyleneglycol and Trimethyleneglycol
    Ryuji Abe, Masakiyo Horioka, Izumi Sakumiya, Satoshi Nakamura
    Subject area: Electron states in condensed matter.
    1994 Volume 63 Issue 11 Pages 4200-4205
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4200
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    Dielectric dispersions for glycerol, propyleneglycol and trimethyleneglycol have been measured in the frequency range from 0.1, kHz to 1, GHz. It is found that for glycerol and propyleneglycol, the ε''(ν ) curve changes the shape gradually with increasing temperature above Ta, whereas for trimethyleneglycol it once disappears around 197, K and appears again above 233, K with gradual change of the shape, where Ta is the temperature below which εp'' falls on a straight line at all temperatures below Ta. It is also examined that a non-ergodic and ergodic transition occurred or not by analyzing the temperature dependence of ν1/1.8p.
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  • Optical Measurements and Band Calculations of FeSi
    Hitoshi Ohta, Shin–ichi Kimura, Erkin Kulatov, Samed V. Halilov, ...
    Subject area: Electron states in condensed matter.
    1994 Volume 63 Issue 11 Pages 4206-4212
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4206
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    Reflectivity measurements of high quality FeSi single crystal have been performed at 6 and 300, K over a very wide spectral region from 0.05 to 30, eV. The optical conductivity is obtained by a Kramers-Kronig transformation, and it is discussed in connection with the recent band calculation in which the relativistic spin-orbit effects are taken into account and with other measurements done on FeSi before. The result of direct photoconductivity measurement in the spectral region from 200 to 800, cm-1 is also presented.
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  • Observation of an Interface Exciton and Exciton Localization in BiI3-CdI2 Multilayer Structures
    Katsuyoshi Watanabe, Noboru Miura, Teruo Komatsu
    Subject area: Electron states in condensed matter.
    1994 Volume 63 Issue 11 Pages 4213-4219
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4213
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    We have succeeded in growing BiI3--CdI2 multilayer structures by the hot wall technique. Optical absorption spectra were measured around the band-edge exciton energy of BiI3. The absorption peak due to the exciton transition exhibited a splitting and energy shifts in multilayer samples depending on the BiI3 film thickness. The higher-energy component was assigned to an exciton transition at interface layers. We also observed exciton transitions in ultra-thin films with thicknesses of a few unit-layers. These phenomena were analyzed by a model considering both exciton localization and a site shift effect.
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  • Theory of Angle-Resolved X-Ray Photoemission by Multiple Scattering Cluster Method. IV. Circular Dichroism for Non-Magnetic Systems
    Takashi Fujikawa, Masaru Yimagawa
    Subject area: Electron states in condensed matter.
    1994 Volume 63 Issue 11 Pages 4220-4243
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4220
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    X-ray circular dichroism in ARXPS spectra is discussed based on multiple scattering cluster method. First we describe the possibility of the circular dichroism for nonmagnetic system without spin-orbit interaction; Elastic scattering from surrounding atoms play an important role for the circular dichroism in photoemission angular distribution. Spin-orbit interaction gives rise to spin flip scattering in the photoelectron production processes and during the propagation of a photoelectron. When we detect spin polarization, we can measure the circular dichroism even if we have no surrounding atoms because of spin-orbit interaction. When we only measure photoelectron current, such effect cannot be expected. Explicit formulas to include scattering effects from surrounding atoms are given, where spin flip elastic scatterings play an important role. Simple model calculations clearly demonstrate those phenomena.
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  • Raman Scattering from Interface Phonons in GaInP/AlInP Superlattice
    Soichi Ochiai, Yoshiko Tanokura, Tomoyuki Sekine, Akihiko Kikuchi, Yaw ...
    Subject area: Electron states in condensed matter.
    1994 Volume 63 Issue 11 Pages 4244-4248
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4244
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    Measurements of Raman scattering were performed on ternary alloy superlattices GaInP/AlInP grown by gas-source molecular beam epitaxy. We observed interface phonons whose frequencies are explained in terms of an electrostatic continuum model using the optical phonons of AlInP and GaInP bulk alloys. The Raman intensities of the interface phonons are enhanced when the incident photon energy is close to the exciton energy in the GaInP quantum wells and to the band gap energy in the AlInP. We measured Raman spectra of AlGaInP quaternary alloy, which have the same composition on a standpoint of average crystal structure, and compare it with the spectra of the superlattice.
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  • Resonant Secondary Emission and Its Excitation Energy Dependence in Monoclinic Zinc Diphosphide
    Osamu Arimoto, Mitsuru Sugisaki, Kaizo Nakamura, Koichiro Tanaka, Tohr ...
    Subject area: Electron states in condensed matter.
    1994 Volume 63 Issue 11 Pages 4249-4255
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4249
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    Resonant secondary emission of monoclinic zinc diphosphide (β -ZnP2) has been investigated in detail under excitation into the energy range from the interband to the exciton-bands region. In addition to the 1LO line of 32.2, meV already reported, we have found more than 30 resonant Raman lines ranging from 9.4, meV to 58.9, meV by varying the excitation energy. These lines are observed distinctly when their scattered energies fall into the vicinity of the 1s exciton energy. It is confirmed that among phonons of 72 modes the LO phonon of 32.2, meV preferentially governs the relaxation processes of exciton polaritons in β -ZnP2. We have also observed a significant intensity decrease of the exciton polariton luminescence when the excitation energy is lowered across the 1s longitudinal exciton energy EL. A brief discussion is made in this connection.
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  • Quantum Heisenberg Ferromagnets with Long-Range Interactions
    Hiroki Nakano, Minoru Takahashi
    1994 Volume 63 Issue 11 Pages 4256-4257
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4256
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  • Accuracy of Stokes' Solution for a Viscous Flow Past a Sphere
    Tsutomu Arai, Akira Sakurai
    Subject area: Mathematical methods in physics.
    1994 Volume 63 Issue 11 Pages 4258-4259
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4258
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  • Atomic Size Effect in the X-Ray Diffraction for Partially Disordered One-Dimensional Molecular Superlattice
    Kazuyoshi Ogasawara, Yoshio Nogami, Takehiko Ishiguro
    Subject area: Classical and quantum physics: mechanics and fields.
    1994 Volume 63 Issue 11 Pages 4260-4261
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4260
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  • Zero-Bias Anomaly in GaAs:Zn Tunnel Junction under Magnetic Field
    Morio Suzuki
    Subject area: Relativity and gravitation.
    1994 Volume 63 Issue 11 Pages 4262-4263
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4262
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  • Adsorption and Desorption of Silicon in Electric Fields
    Kazuyuki Watanabe, Takashi Abe
    Subject area: Statistical physics and thermodynamics.
    1994 Volume 63 Issue 11 Pages 4264-4265
    Published: November 01, 1994
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.63.4264
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