Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
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Volume 56, Issue 7
Displaying 1-50 of 53 articles from this issue
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  • Nonlinear Slow Fluctuation in Magnetic Ordering of CoCl2–GIC —Observation of a 1⁄ω-Type Spectrum—
    Motohiro Matsuura, Yasunaga Endoh, Takashi Kataoka, Youichi Murakami
    1987 Volume 56 Issue 7 Pages 2233-2236
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2233
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    Dynamical aspects of magnetic ordering in CoCl2-graphite intercalation compounds (GIC) were examined by complex AC susceptibility X*(ω) measurements at very low frequencies, down to the sub-millihertz region. The nearly independent feature of the imaginary part X″ on the measuring frequency ω has revealed the first direct finding of a 1⁄ω-type fluctuation spectrum in regular magnetic systems, on the basis of the fluctuation-dissipation theorem. The origin of the nonlinear fluctuation is discussed, taking the characteristic lattice structure into account.
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  • Quasilinear Electron Heating by Electrostatic Electron Cyclotron Harmonic Waves in a Plasma
    Masao Sugawa
    1987 Volume 56 Issue 7 Pages 2237-2240
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2237
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    Electron heating via the interaction with linearly stable electrostatic electron cyclotron harmonic waves was observed. This heating is interpreted to be based on the cyclotron damping caused by the quasi-linear interaction for a weakly turbulent plasma.
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  • Saturated Island Width in Tokamak with External Helical Perturbation
    Hiroshi Yamada, Zensho Yoshida
    1987 Volume 56 Issue 7 Pages 2241-2244
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2241
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    A self-consistent theoretical estimate of tearing-mode-island width is given for tokamak plasmas with external helical-field perturbations. The Δ′ criterion is applied to a system with a resonant helical field. The external perturbation is dealt with as an inhomogeneous boundary condition for the flux function.
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  • Neutron Diffraction Study on the Low-Temperature Monoclinic Form of PrCu6
    Hajime Asano, Masayuki Umino, Yoshichika \={O}nuki, Takemi Komatsubara ...
    1987 Volume 56 Issue 7 Pages 2245-2247
    Published: July 15, 1987
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2245
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    The crystal structure of PrCu6 was studied at room temperature and 85 K by means of high-resolution neutron powder diffraction. The room-temperature structure is isomorphic with orthorhombic CeCu6. The crystal structure at 85 K was clarified to be monoclinic with a space group P21/c and isomorphic with LaCu6. Low-temperature X-ray diffraction indicates a monoclinic-orthorhombic structural phase transition at 205 K.
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  • Equilibrium Crystal Shape: Two Dimensions and Three Dimensions
    Noriko Akutsu, Yasuhiro Akutsu
    1987 Volume 56 Issue 7 Pages 2248-2251
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2248
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    We show that the two-dimensional (2D) equilibrium crystal shape (ECS) determined from the anisotropic step free energy gives the facet shape of the 3D ECS below the roughening temperature. This fact brings us a general and efficient method to obtain the essential feature of 3D ECS, by estimating the step free energy from the 1D solid-on-solid (SOS) model or the 2D Ising model. We apply the method to the body-centered-cubic solid-on-solid (BCSOS) model and obtain almost the exact facet shape for a wide range of temperatures.
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  • Existence of Mobility Edge in Amalgamation Bands of Mixed Crystals
    Jun’ichir\={o} Nakahara, Shigeru Minomura, Hiroshi Kukimoto, Fuj ...
    1987 Volume 56 Issue 7 Pages 2252-2255
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2252
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    It is reported that the temperature dependence of luminescence intensity in AlxGa1−xAs and Cd1−xMnxTe obeys the same relation 1⁄(1+A exp (T⁄T0)) as is observed in amorphous Si:H and chalcogenide glasses. This temperature dependence is well understood by the assumption that a mobility edge exists near the edge of amalgamation-type bands in mixed crystals, and that localized states exist continuously below the mobility edge. The same dependence is observed for the luminescence intensity from bound magnetic polarons in Cd.95Mn.05Te.
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  • Quantum Size Effect of Cu Small Particles in Magnetic Field
    Shun-ichi Kobayashi, Shingo Katsumoto
    1987 Volume 56 Issue 7 Pages 2256-2258
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2256
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    We measured the magnetic field dependence of the Knight shift of 63Cu NMR in two samples of small copper particles with average diameters of 60 A and 100 A in fields of up to 4.9 T. When the magnetic field is so high that the Zeeman energy is larger than the average spacing of the energy levels of conduction electrons, the correlation between the levels of opposite spins is lost, and the spin susceptibility anomalies inherent in small particles vanishes. The results of the present experiment are in agreement with this expectation.
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  • Fine Tuning of Metal-Insulator Transition in Al0.3Ga0.7As Using Persistent Photoconductivity
    Shingo Katsumoto, Fumio Komori, Naokatsu Sano, Shun-ichi Kobayashi
    1987 Volume 56 Issue 7 Pages 2259-2262
    Published: July 15, 1987
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2259
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    We report experiments on the electrical conductivity of Al0.3Ga0.7As:Si in the critical region of the metal-insulator transition. The electron concentration is finely controlled in the vicinity of the transition using the persistent photoconductivity effect. The value of the critical exponent turns out to be 1. The metal-insulator transition due to the delocalization effect by the magnetic field is also studied.
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  • 195Pt Knight Shift in the Heavy Fermion Superconductor UPt3
    Yoh Kohori, Takao Kohara, Hirofumi Shibai, Yasukage Oda, Tetsuyuki Kan ...
    1987 Volume 56 Issue 7 Pages 2263-2266
    Published: July 15, 1987
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2263
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    We observed 195Pt NMR in UPt3 in both the normal and superconducting states. The spectrum has a large negative shift and is quite anisotropic. In 5 kOe, no changes in the negative shift were observed down to the temperature of 60 mK, where the system was in the superconducting state. This means that the conduction electron spin susceptibility does not decrease in the superconducting state. The result does not contradict the possibility of anisotropic p-wave superconductivity of UPt3.
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  • Copper Pairs of dγ-Symmetry in Simple Square Lattices
    Fusayoshi J. Ohkawa
    1987 Volume 56 Issue 7 Pages 2267-2270
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2267
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    Physical properties of dγ-symmetry Cooper pairs were theoretically investigated by assuming the dispersion relation of a simple square lattice with the nearest neighbor transfer integral and attractive interactions between the nearest neighbors. Calculated properties such as the energy gap, the density of states and the NMR relaxation time show highly anisotropic features. A possibility is discussed that dγ-symmetry superconductivity realized by the nearest neighbor exchange interactions can explain the properties of high-Tc ceramic superconductors recently discovered. It is also shown that exchange interactions determined in insulating phases can explain high superconducting transition temperatures in metallic phases.
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  • Effects of Magnetic Frustrations on dγ-Symmetry Cooper Pairs in Simple Square Lattices
    Fusayoshi J. Ohkawa
    1987 Volume 56 Issue 7 Pages 2271-2274
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2271
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    The nearest-neighbor attractive interaction and the van Hove singularity definitely prefer dγ-symmetry Cooper pairs in simple square lattices with the nearest-neighbor transfer integrals. What are examined are the effects of magnetic frustrations on superconductivity realized by superexchange interactions in metallic phases as well as those on magnetic orderings in insulating phases. Although magnetic transition temperatures are significantly reduced by frustrations as expected, superconducting transition temperatures are not depressed, but are actually enhanced in certain cases by magnetic frustrations. A detailed analysis of magnetism in insulating phases is necessary to estimate transition temperatures of superconductivity realized by superexchange interactions.
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  • Specific Heat of Insulating EupSr1−pS
    Kazuko Kawasaki, Chiyo Hamamura, Yuka \={O}michi
    1987 Volume 56 Issue 7 Pages 2275-2278
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2275
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    The specific heat is studied by high-temperature series expansion up to β6 for an fcc Heisenberg spin system with nearest-neighbor ferromagnetic exchange interaction J1 and next-nearest-neighbor antiferromagnetic exchange interaction J2, between randomly distributed magnetic moments of arbitrary concentration p. The obtained results are compared with recent experimental data on EupSr1−pS, where due to the frustration effect, various magnetic phases occur. Reasonable agreement is found near the onset of the ferromagnetic or spin-glass phase from the paramagnetic phase.
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  • Anomalous Magnetostriction in CeAg1−xInx
    Makio Kurisu, Hideoki Kadomatsu, Hiroshi Fujiwara
    1987 Volume 56 Issue 7 Pages 2279-2282
    Published: July 15, 1987
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2279
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    The thermal expansion, magnetization and magnetostriction of CeAg1−xInx with 0≤x≤0.5 have been measured between 4.2 K≤T≤300 K and in magnetic fields of up to 65 kOe. At its cubic-tetragonal transition temperature, the lattice contracts drastically with decreasing T for x≥0.01, while for x=0, no thermal expansion anomaly is found at the quadrupole ordering temperature. Anomalously large and irreversible magnetostriction is observed for x=0.01 and 0.03. Such behavior is interpreted in terms of the redistribution of the tetragonal phase domains induced by an application of magnetic field.
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  • Search for Magnetic Scattering in La2CuO4
    Bingxin X. Yang, Setsuo Mitsuda, Gen Shirane, Yasuo Yamaguchi, Hiroshi ...
    1987 Volume 56 Issue 7 Pages 2283-2286
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2283
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    Magnetic ordering in pure La2CuO4 has been reexamined with high-resolution neutron diffraction from a powder sample. We have observed the onset of antiferromagnetic ordering at a Néel temperature of 250 K and a net moment 0.40±0.04 μB per Cu ion. The Néel temperature coincides with an anomaly in the bulk susceptibility. While these quantities are in disagreement with a previous study of the same sample, which yielded 240 K and 1.1 μB respectively, they are in good agreement with a recent work by Vaknin et al.
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  • 31P Nuclear Magnetic Relaxation Studies of the Dynamical Magnetic Behavior of UP
    Shigeru Takagi, Norio Niitsuma, Teiji Yoshida, Tadao Kasuya
    1987 Volume 56 Issue 7 Pages 2287-2290
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2287
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    31P nuclear magnetic relaxation has been utilized to study the spin dynamics of U 5f moments in the antiferromagnetic uranium compound UP in the paramagnetic state up to 800 K. The nuclear spin-lattice relaxation time T1 increases almost linearly with temperature above about 300 K. Evaluating the transferred hyperfine coupling constants due to up to the second nearest-neighbor U ions, the relaxation rate 1⁄τf of U 5f moments is deduced. h⁄τf is found to be comparable to the thermal energy kBT and to increase almost linearly with temperature above about 300 K.
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  • A Way from String to Soliton —Introduction of KP Coordinate to String Amplitudes—
    Kiyoshi Sogo
    1987 Volume 56 Issue 7 Pages 2291-2297
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2291
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    By the use of Tomonaga’s boson-fermion correspondence, we show explicitly the equivalence of vertex operators in three apparently different theories: bosonic string theory, τ function theory and soliton theory of Kadomtsev-Petviashvili (KP) hierarchy. Amplitude with arbitrary external momenta and with KP coordinates is calculated for tree and one-loop level in open bosonic string theory.
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  • Yang-Baxter Relations for Spin Models and Fermion Models
    Eugenio Olmedilla, Miki Wadati, Yasuhiro Akutsu
    1987 Volume 56 Issue 7 Pages 2298-2308
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2298
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    A systematic method to derive the Yang-Baxter relations for the fermion models which are equivalent to the solvable spin models is presented. The method is applied to prove the Yang-Baxter relation and the commutability of the transfer matrices for the one-dimensional Hubbard model.
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  • Equilibrium Shapes and Vibrations of Thin Elastic Rod
    Hideo Tsuru
    1987 Volume 56 Issue 7 Pages 2309-2324
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2309
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    Static equilibrium equations and dynamical equations for a thin elastic rod are studied in detail. The relation between the local induction equation for the vortex filament and the equilibrium equations of the elastic rod is clarified. The static equations are solved exactly and the shapes of the rod in a real space are obtained. The localized solution is a solitary wave. It deviates from a plane when the torsion exists. When the rod is strained initially, vibrational modes are coupled and the dispersion relations are modified. Linear stability of the twisted circular rod is also examined.
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  • Effect of Quantum Fluctuations on the Onset of Chaos in Josephson Junctions
    Kazuo Hida
    1987 Volume 56 Issue 7 Pages 2325-2331
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2325
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    The effect of the quantum fluctuations on the onset of chaos in the dynamics of the Josephson junction is studied by numerical simulation and the scaling theory using the semiclassical quantum Langevin equation. It is found that the effect of the quantum noise has the same universal property as the classical noise in the critical region of period doubling cascade and intermittency.
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  • On Lagrangian and Eulerian Interpretations of the Local Equilibrium Assumption in Nonequilibrium Convective Systems
    Seiya Abiko, Kazuo Kitahara
    1987 Volume 56 Issue 7 Pages 2332-2339
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2332
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    The formulation of nonequilibrium thermodynamics with convective flow under the influence of external potential field is made from the two view points of Lagrangian and Eulerian. Specifying two meanings of the local equilibrium assumption, we define two sets of the thermodynamic forces and fluxes, and derive two evolulion criteria in each picture.
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  • Dynamics of an Initially Random Fractal Interface
    Hiroshi Orihara, Yoshihiro Ishibashi
    1987 Volume 56 Issue 7 Pages 2340-2347
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2340
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    We investigate the dynamic behavior of the interface in a two-dimensional space, the velocity of which is proportional to the local curvature and which is a random fractal at the initial moment. It is shown theoretically that the correlation function of the tangential unit vector of the interface satisfies a scaling law. The dynamics of a disclination in a quenched nematic liquid crystal is studied experimentally to exemplify the above theory and a good agreement between them is obtained. The difference between the dynamics of the single disclination and the assembly of disclinations is discussed.
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  • Formation of Clusters in 340 GeV/c π− Emulsion Interactions
    H. Ahrar, M. Zafar, M. Shafi
    1987 Volume 56 Issue 7 Pages 2348-2350
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2348
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    New data from 340 GeV/c π−-emulsion interactions are analyzed to investigate the cluster formation and their dependences with the target size and multiplicity. The data show significant dependence of the rapidity-gap distributions on the multiplicity. The multiplicity of clusters does not depend on the target size.
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  • Production of Clusters and Heavy Clusters in Nucleon-Nucleon Interactions at 400 GeV/c
    H. Ahrar, S. Ahmad, A. Tufail, M. Zafar, M. Shafi
    1987 Volume 56 Issue 7 Pages 2351-2356
    Published: July 15, 1987
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2351
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    In the present paper an attempt has been made to study the production of heavy clusters using the rapidity-interval method proposed by Adamovich et al. among hadrons produced in 400 GeV/pN and p-emulsion collisions. The results show some weak evidence for the production of heavy clusters at 400 GeV. The study of two particle rapidity-gap distributions gives an indication for strong short-range correlation and weak long range correlation at 400 GeV pN interaction.
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  • Three-Body Breakup Reaction in FSI Region
    Kiyoji Fukunaga, Sigeru Kakigi, Takao Ohsawa, Akira Okihana, Tsuguhisa ...
    1987 Volume 56 Issue 7 Pages 2357-2362
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2357
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    In a final-state-interaction region an analytical formula of transition amplitude is obtained using a second Born approximation to solve the AGS three-body equation. The breakup amplitude is represented as a product of two scattering amplitudes and a correction factor. Comparisons with experimental data are given and good fits are obtained.
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  • Collision-Induced Two-Photon Absorption of Ultrashort Light Pulses
    Kenji Torizuka, Norio Morita, Tatsuo Yajima
    1987 Volume 56 Issue 7 Pages 2363-2380
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2363
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    The relation between the spectral character of a completely off-resonant two-photon absorption and the non-impact collision dynamics of a three-level atomic system is studied. A collisionally induced resonance character in the spectral dependence of the absorption probability is shown theoretically. Measured results about the dependence of fluorescence intensity on the incident light frequencies are in good agreement with the theory. The interatomic potential between the sodium 4D state and argon is also estimated from experimental results.
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  • Composition Dependence and Inversion of αT of N2–CO Gas Mixture
    I. L. Saha, A. K. Datta, A. K. Chatterjee, S. Acharyya
    1987 Volume 56 Issue 7 Pages 2381-2386
    Published: July 15, 1987
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2381
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    The available concentration variation on In qe data of isobaric N2–CO gas mixtures in a hot wall thermal diffusion column has been utilised to calculate the composition dependence of thermal diffusion factor αT at three experimental temperatures 350.1, 368.1 and 432.0 K. It is found that there is always an inversion of αT as a function of composition for these experimental temperatures, indicating further that this inversion phenomenon occurs in a well-defined temperature range 248.6 K to 610.1 K. If the experimental conditions on composition and temperature fall within the area enclosed by the inversion curve and the temperature axis, in general, N2 enriches at the top of the column; if they are outside, then N2 enriches at the bottom.
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  • Super-Critical States of Double-Diffusive Convection under Time-Periodic Heating
    Shinichiro Yanase, Nozomu Gotoh
    1987 Volume 56 Issue 7 Pages 2387-2395
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2387
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    Super-critical states of a horizontal double-diffusive fluid layer under time-periodic heating is investigated by truncation models. It is found that if there is no salinity stratification, the fluid layer immediately attains a periodic motion tuned with the oscillation of external temperature field. If there is a stable salinity stratification, not only a periodic motion but a nonperiodic or chaotic motion appears in the supercritical states.
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  • Weak Compressive Ion Acoustic Double Layers in Presence of Negative Ions on the Auroral Field Lines
    K. S. Goswami, S. Bujarbarua
    1987 Volume 56 Issue 7 Pages 2396-2400
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2396
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    The propagation of ion acoustic double layers in a plasma containing a negative species of ions has been investigated theoretically. It has been found that this type of double layer exists when the electric potential is positive and the negative ion concentration is greater than some limiting value. It has also been shown that the double layers discussed in this paper may explain the recent observations on the auroral field lines.
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  • Experiment on the Anisotropy of Electron Temperature in ECR Plasma
    Hiroshi Amemiya, Hitoshi Oyama, Yuichi Sakamoto
    1987 Volume 56 Issue 7 Pages 2401-2412
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2401
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    Measurements of electron temperatures in the direction parallel and perpendicular to the magnetic field are made in a plasma produced by ECR (electron cyclotron resonance) in order to investigate the temperature anisotropy. It is found that the temperature perpendicular to the field is higher than the temperature parallel to the magnetic field by 3%–30% depending on the experimental condition. Dependence of anisotropy on the gas pressure, the resonance field configuration and the microwave power is studied. Discussion is made on the mechanisms causing the anisotropy and the energy relaxation.
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  • Structural Study of Amorphous SiGe Alloy Films Using Extended X-Ray Absorption Fine Structure
    Masatoshi Wakagi, Toshiyuki Ohno, Mitsuo Chigasaki, Masaharu Nomura
    1987 Volume 56 Issue 7 Pages 2413-2419
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2413
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    Extended X-ray absorption fine structure (EXAFS) measurements were made on a-SiGe and a-SiGe:H prepared by rf-diode sputtering and glow discharge decomposition along with crystal line SiGe, c-SiGe, prepared by annealing the amorphous samples. The Fourier transforms of Ge K-edge EXAFS of c-SiGe prepared by annealing sputtered a-SiGe, a-SiGe:H and glow discharge a-SiGe:H resemble each other in shape. The Fourier transforms of Ge K-edge EXAFS of sputtered and glow discharge a-SiGe:H films are also quite similar to each other. On investigating EXAFS and X-ray absorption near edge structure, XANES, of c-SiGe, a-SiGe and a-SiGe:H, it is found that the disorder of the network structure in the SiGe alloy system increases in the order of c-SiGe, a-SiGe and a-SiGe:H.
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  • Neutron Diffraction Study of Structural Phase Transition in Ferroelectric Li2Ge7O15
    Yutaka Iwata, Iwao Shibuya, Mitsuo Wada, Akikatsu Sawada, Yoshihiro Is ...
    1987 Volume 56 Issue 7 Pages 2420-2427
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2420
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    Structural change in Li2Ge7O15 crystal associated with the ferroelectric phase transition at 283.5 K has been investigated by neutron diffraction method. Comparison between the high- and the low-temperature structures proves that the change within a framework composed of corner-sharing [GeO4] and [GeO6] polyhedra is ascribed mainly to cooperatively combined tilting motion of the tetrahedra. This phenomenon may seem to be a soft phonon mode previously observed by the Raman scattering measurement. Behavior of Li+ ions in channels formed by the framework has also been examined. It is shown quantitatively by using split-atom method that one of the two Li+ ions in a broader channel seems to behave rather ‘order-disorder’ nature motion along the channel direction in the vicinity of the transition temperature.
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  • Behaviour of Acoustical Phonons in Metals in Low Temperature Region
    S. K. Kor, Kailash , K. Shanker, P. Mehrotra
    1987 Volume 56 Issue 7 Pages 2428-2432
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2428
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    A theory for studying the ultrasonic attenuation due to interaction of conducting electrons and acoustical phonons in metals is evolved at low temperatures and zero magnetic field starting from primary physical constants and using basic potentials. The same is tested for the case of noble metals. It is observed that the attenuation increases rapidly as temperature is lowered and is very high around 10 K. The available experimental evidences are found in support of the present results.
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  • Electron-Lattice Interaction and Lattice Dynamics in Black Phosphorus
    Masato Aoki, Naoshi Suzuki
    1987 Volume 56 Issue 7 Pages 2433-2447
    Published: July 15, 1987
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    DOIhttps://doi.org/10.1143/JPSJ.56.2433
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    The electron-lattice interaction in a narrow gap semiconductor, black phosphorus, is studied microscopically on the basis of tight-binding calculations of the electronic band structure. Interplanar forces along the [100] direction caused by the electron-lattice interaction are evaluated from the generalized electronic susceptibility calculated by using the electron-lattice coupling constants. Reflecting the narrow gap, the interplanar forces have significant values even for far neighboring planes. Further, considerable decrease of the energy gap induced by pressure gives rise to characteristic pressure dependences of the interplanar forces, which lead to a qualitative explanation of the observed pressure dependences of the phonon dispersion curves.
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  • Localized Mode Oscillations of Clustered Impurities Excited by a Soliton in the Toda Lattice
    Masanori Aoki, Yoshinori Tabata
    1987 Volume 56 Issue 7 Pages 2448-2454
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2448
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    The collision of a soliton with a cluster of mass impurities is studied by computer simulation. The mass ratio dependence of the energy of the localized mode is investigated form the clusters of 2∼5 impurities. The amplitude of the incident soliton is taken A=2 (force fn=A \sech2(κn−\sqrtAt)). All frequencies of the oscillation modes that are dominantly excited fall in the range ω=2.1∼2.3, which is just above the cutoff frequency (ωc=2.0). The saturation of the energy of the localized mode is observed at the considerably small cluster size. The property of the localized modes is also discussed theoretically in harmonic limit.
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  • The Antiferroelectric Phase Transition in the Slater-Takagi Model of Ammonium Dihydrogen Phosphate (NH4H2PO4) Type Crystals —Effect of the Removal of the Ice Condition—
    Yoshihiro Ishibashi
    1987 Volume 56 Issue 7 Pages 2455-2459
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2455
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    The antiferroelectric phase transition in ammonium dihydrogen phosphate NH4H2PO4 (ADP) type crystals is discussed in terms of the Slater-Takagi model with the ice condition completely removed. It is found that the transition can be of the second order if the energy level of the Takagi configuration is suitably chosen.
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  • Superconductivity vs. Charge Density Wave in One-Dimensional Bipolaron System with Random Potentials —S=1/2 XXZ-Chain with Random Fields—
    Naoto Nagaosa
    1987 Volume 56 Issue 7 Pages 2460-2470
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2460
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    We investigate the effects of the randomness and electron-electron interactions on the competition between superconductivity and charge density wave in one-dimensional bipolaron system in the half-filled case at finite temperatures. The model is transformed into the S=1⁄2 XXZ-chain with random fields, and we carry out the numerical simulation using the transfer matrix by Suzuki-Trotter formula. When the interaction between neighboring bipolarons is attractive, the suppression of the correlation functions is described by the scaling law. This result is discussed in connection with the Fukuyama-Lee length including the quantum fluctuations. When the interaction is repulsive, weak randomness suppresses the charge density wave and enhances the superconductivity, but strong randomness suppresses both.
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  • Photoemission Studies on Intercalation Compounds of MxTiS2 (M=3d Transition Metals)
    Yoshifumi Ueda, Kensuke Fukushima, Hiroshi Negishi, Masasi Inoue, Masa ...
    1987 Volume 56 Issue 7 Pages 2471-2476
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2471
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    Effect of 3d transition metal intercalation into 1T-CdI2 type TiS2 layered crystals, expressed as MxTiS2 (M=Mn, Fe, Co and Ni), has been studied by synchrotron radiation photoemission over the photon energy range of hω=32–120 eV. The spectra are found to depend strongly on the guest 3d metals and their conacentration. The valence bands are modified by the strong hybridization of Ti 3d, S 3p states and the guest atom 3d states, in good agreement with a theoretical prediction.
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  • Simulation of Compton Double Scatterings of Circularly Polarized γ-Rays by Magnetic Electrons
    Nobuhiko Sakai
    1987 Volume 56 Issue 7 Pages 2477-2485
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2477
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    In a recent study on the magnetic-electron Compton profile measurement by the author, an important correction of the spin-dependent multiple scatterings of circularly polarized γ-rays in a specimen was made on the basis of a computer simulation of the double scattering. This paper describes the detailed procedure of its simulation. It is found that the spin-dependent double scattering intensity is about one third of the ordinary double scattering intensity, due to the mutual cancellation among the intensities of spin-dependent double scattered γ-rays themselves.
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  • Resonant Photoemission Study of CeCu2 and CeCu2Si2
    Kazuo Soda, Tamiko Mori, Seiji Asaoka, Takehiko Ishii, Yoshichika \={O ...
    1987 Volume 56 Issue 7 Pages 2486-2493
    Published: July 15, 1987
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2486
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    The energy distribution of the 4f partial density of states has been measured on CeCu2 and CeCu2Si2 by means of the 4d-4f resonant photoemission. In CeCu2, states with the 4f character are distributed all over the valence band forming a major peak at 2.3 eV below the Fermi edge; the Ce 5d band exists near the Fermi level where the fractional density of the states with the 4f character is low. In CeCu2Si2, the 4f band spreads over the range within 3.5 eV from the Fermi edge with a few fine structures and does not form a prominent peak; the 4f partial density of states at the Fermi level is much higher than those in CeCu2 and CeCu6. Such aspects suggest a large hopping matrix element between the 4f level and the conduction states, as is consistent with the heavy-fermion superconductivity in CeCu2Si2.
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  • Electronic Density of States for Quasi-One-Dimensional Charge Density Waves
    Yoshikazu Suzumura
    1987 Volume 56 Issue 7 Pages 2494-2502
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2494
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    By making use of the phase representation for the quasi-one-dimensional system consisting of linear chains with Tomonaga-Luttinger model, the electronic density of states for the charge density waves is calculated at zero temperature in order to examine the effect of the one-dimensional (1-D) fluctuation which originates in the intrachain interaction. In addition to a true gap caused by the long range order, a pseudogap is induced around the Fermi surface by the 1-D fluctuation. It is shown that the density of states just above the true gap diverges (reduces to zero continuously) in the case of the weak (strong) intrachain interaction.
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  • Nonlinear Conductivity Due to Field-Induced Depinning of Charge-Density Waves in NbSe3
    Masayuki Ido, Yoshitoshi Okajima, Hirotsugu Wakimoto, Migaku Oda
    1987 Volume 56 Issue 7 Pages 2503-2510
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2503
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    The conductivity σe due to sliding charge-density-wave (CDW) was measured in the T1-CDW regime of NbSe3. The measurements were also carried out on both crystals doped with Ti and with Ta. At high temperatures, where the CDW is considered in the impurity pinning regime, it is found that the field dependence of σe is independent both of depinning field and of the temperature, but it depends largely on a kind of the dominant impurity contained within the crystal. At low temperatures where the depinning field of the CDW is enhanced enormously, the field dependence of σe is different drastically from that observed at high temperatures.
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  • Angle-Resolved Ultraviolet Photoelectron Spectroscopy Study of the Si(111)\sqrt3×\sqrt3-Bi Surface
    Toyohiko Kinoshita, Shozo Kono, Hideo Nagayoshi
    1987 Volume 56 Issue 7 Pages 2511-2515
    Published: July 15, 1987
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2511
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    Angle-resolved ultraviolet photoelectron spectra have been measured for the Si(111)\sqrt3×\sqrt3-Bi surface. It has been found that at least four occupied surfacestate bands exist on the \sqrt3×\sqrt3-Bi surface. The results are compared particularly with the surface electronic structures of 1/3 ML adatom models with the consideration of spin-orbit interaction.
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  • Fluctuation-Induced Conductivity of Tin Superconducting Films with the Overdeposition of Gold
    Takamitsu Kobayashi, Shigeki Kojima, Kiyomi Okamoto, Mieko Ohtsuka
    1987 Volume 56 Issue 7 Pages 2516-2519
    Published: July 15, 1987
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2516
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    Effect of the spin-orbit scattering on the fluctuation-induced conductivity (FIC) above the superconducting transition temperature of tin films was investigated. Samples were prepared by the overdeposition of gold about 1 atomic layer. For comparison, unoverdeposited samples were also prepared. The measured FIC is well explained by the traditional superconducting fluctuation theory with three parameters, i.e. the transition temperature Tc, the pair-breaking parameter δ and the normal sheet resistance (Remark: Graphics omitted.). An experimental relation (Remark: Graphics omitted.) holds for each type of the samples. The values of δ for the gold overdeposited samples were larger than those for the unoverdeposited samples, which is considered to be due to the spin-orbit scattering effect owing to the existence of gold.
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  • Diamagnetic Susceptibility of AgI-AgBr System —Phenomenological Approach—
    Haruyuki Takahashi
    1987 Volume 56 Issue 7 Pages 2520-2527
    Published: July 15, 1987
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2520
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    The magnetic susceptibilities of an AgI-AgBr system have been measured as a funclion of concentration and temperature. Temperature dependence of the susceptibilities is interpreted in terms of a bond-orbital model. An atempt to separate the Van Vleck term from the Langevin term is made on the basis of this model. Important roles of the s-d hybridization and the overlap of valence orbitals are also pointed out from these results.
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  • Establishment of Dipole Equilibrium V2+ Doped NaCl
    Takeo Iri
    1987 Volume 56 Issue 7 Pages 2528-2534
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2528
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    Electron paramagnetic resonance techniques have been applied to investigate the variation of population distribution with temperature and time between nearest and next nearest neighbour V2+-vacancy dipoles. The process involves the rate W3 at which a next nearest vacancy interchanges its position with a particular nearest neighbour Na+, and the rate W4 of the inverse process to that of W3. The processes were investigated in the temperature range from 20°C down to −110°C. The jumping frequencies can be expressed in the Arrhenius forms W3=A3 exp (−E3⁄kT) and W4=A4 exp (−E4⁄kT) with the values: A3=3.45×109±0.3s−1, A4=1.27×1010±0.3s−1, E3=0.4876±0.010 eV and E4=0.5051±0.010 eV.
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  • Brillouin Scattering Study of Deuterated Dicalcium Strontium Propionate, Ca2Sr(C2D5CO2)6
    Toshirou Yagi, Hiroshi Fujisaki, Akira Sakai
    1987 Volume 56 Issue 7 Pages 2535-2541
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2535
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    Brillouin scattering spectra of deuterated dicalcium strontium propionate (DDSP) have been observed as a function of temperature near the paraelectric-ferroelectric phase transition temperature TC (279.5 K). The elastic stiffness constants cij in the giga hertz range are determined by the Brillouin frequency shift in the temperature region 260–300 K. The longitudinal acoustic modes propagating along the tetragonal [100] and [001] directions show a smaller anomaly at Tc than that of the non-deuterated DSP reported previously. The elastic dispersion Phenomena are discussed with particular emphasis on the role of the motion of the propionate molecules in the phase transition mechanism of DSP and DDSP.
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  • Dielectric Constant of the Quasi-One-Dimensional Ferroelectrics PbHPO4
    Noriyuki Nakatani
    1987 Volume 56 Issue 7 Pages 2542-2548
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2542
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    Effects of heat treatment and application of external bias field on the temperature dependence of static dielectric constant along the ferroelectric axis in the paraelectric phase have been measured for PbHPO4 single crystals grown by the tetramethoxy-silane-gel method. The crystals were proved to be biased in both directions almost equally by internal field. The internal field is induced by keeping the crystal at the ferroelectric phase and reduced by heat treatment at a high temperature. Supposing such an internal field, we can plainly describe the temperature dependence of dielectric constant on the basis of the quasi-one-dimensional Ising model.
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  • Time-Resolved Luminescence Spectra of AgBr at High Density Excitations
    Tetsuya Baba, Taizo Masumi
    1987 Volume 56 Issue 7 Pages 2549-2564
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2549
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    Tow new luminescence bands of AgBr have been investigated over a wide range of excitation power. A luminescence band (M-line) at λ=465 nm is intrinsic to AgBr at high density excitations by a pulsed dye laser, a nitrogen laser and a pico-second Nd3+-YAG laser. Dependence of the intensity on the excitation power, the energy position, the line shape, and the response to external magnetic fields of this luminescence band verify that the M-line is due to the partial radiative recombination of “free excitonic molecules” in AgBr. Another band (Q-band) at λ=478 nm is observed over a wide range of excitations and yields no superlinear dependence on excitation intensity in this range. Multiphonon structure at CW excitation together with sensitive dependence of the intensity on the origin and history of specimens suggest that the Q-band is due to unknown trapped and/or immobile states in purer but imperfect specimens of AgBr.
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  • Multiple LO Phonon Scattering in Orthorhombic Thallous Iodide
    Nobuhito Ohno, Kaizo Nakamura, Yoshio Nakai
    1987 Volume 56 Issue 7 Pages 2565-2569
    Published: July 15, 1987
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2565
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    The scattering spectrum of orthorhombic TlI has been measured at 2 K under the resonant excitation around the first exciton energy of 2.87 eV. The spectrum is composed of multiple LO phonon lines showing a characteristic intensity alternation as was found in indium halides. The dependence of intensities of the LO lines on the incident photon energy has been investigated. The LO lines show a resonant enhancement in intensity with 2s and higher exciton states as well as with the 1s exciton state. It is also found that some of the excitons relaxed to the band bottom are transformed into photons with the emission of 2LO phonons rather than 1LO phonon.
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  • Guided Wave Mode of the Surface Exciton Polariton in Anthracene Crystal
    Yasuo Nozue, Miho Kawaharada, Takenari Goto
    1987 Volume 56 Issue 7 Pages 2570-2580
    Published: July 15, 1987
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.56.2570
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    The stable solution of the TE-guided wave mode (TE–GWM) of the surface exciton polariton is obtained in the (001)-surface of anthracene crystal. The luminescence band observed around the surface exciton energy is ascribed to the radiative decay of the TE–GWM. The peak energy and the large width of this band are interpreted by the calculated dispersion curve of the TE–GWM. The incoming and outgoing resonances are observed in the Raman scattering by a surface phonon. The Raman line energy at the outgoing resonance coincides with the energy of the TE–GWM. The outgoing resonance is interpreted by the model of the TE–GWM. The luminescence structure observed below the surface exciton energy is assigned to the side-band of the TE–GWM associated with the emission of the surface phonon.
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