Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
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Volume 58, Issue 12
Displaying 1-50 of 52 articles from this issue
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  • Real Number Distribution Method for a Self-Consistent System of Equations in One-Dimensional Problems
    Shuji Obata
    1989 Volume 58 Issue 12 Pages 4257-4260
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4257
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    A solution method for a self-consistent system of equations is improved by utilizing the inherent principle in the Cauchy probability distributions. Using this method, as an example, the imaginary parts of the Green functions are evaluated in an infinite one-dimensional system using a model of a polymer with an unbalanced orbital. In applications of this method, the matrix of the secular equation is not necessarily symmetric and the interaction length among orbitals is unrestricted.
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  • Gradual and Sudden Transition to Chaos in a Sinusoidally Driven Nonlinear Oscillator
    J. Awrejcewicz
    1989 Volume 58 Issue 12 Pages 4261-4264
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4261
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    Two different scenarios leading from periodic orbits to chaotic orbits are traced, based on the shooting method. Starting with the 1/2 resonance solution, the sudden appearance of the strange chaotic attractor with increase of the static load, is discussed and illustrated. For this case the multiplier crosses the unit circle of the complex plane at +1. When the load decreases however the solution first goes through three successive period doubling bifurcations to the fourth subharmonic resonance. This subharmonic resonance becomes particularly sensitive with further decrease in the load and then the motion becomes chaotic.
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  • Ion-Temperature-Gradient-Driven Drift Mode Coupled to the Resistive Interchange Mode in a Heliotron/Torsatron
    Masatoshi Yagi, Masahiro Wakatani, Hideo Sugama, B. G. Hong, W. Horton
    1989 Volume 58 Issue 12 Pages 4265-4268
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4265
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    A new type of ηi mode is studied in a sheared slab model including an averaged curvature by an electrostatic incompressible fluid model describing both ion-temperature-gradient-driven drift modes (ηi modes) and resistive interchange modes (g modes) for a heliotron/torsatron. This ηi mode is destabilized by the coupling to the unstable g mode. In the low shear limit, the ηi modes driven by the unfavorable average curvature remain, and their growth rates depend weakly on the compressibility effect. The ηi modes are weakly destabilized by electron-ion collisions.
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  • A New Low-Temperature Dislocation-Relaxation Peak in Aluminum
    Toshio Kosugi, Takao Kino
    1989 Volume 58 Issue 12 Pages 4269-4272
    Published: December 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4269
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    Amplitude-independent internal friction measurement is made on a zone-refined aluminum single crystal between 2–240 K by a composite oscillator method. In the lightly deformed state (\lesssim10−4), a new relaxation peak is clearly found at 11 K. The activation energy of this peak is derived to be about 0.01 eV by assuming the attack frequency f0=1010 s−1, and if the peak is due to the kink pair formation of the dislocation on the Peierls potential valley, the Peierls stress is estimated to be about 10−5 μ (μ: shear modulus), which does not conflict with the yield stress of low-temperature plastic deformation measurements.
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  • Luminescence Decay of the V-Type Centers in KI Crystals Containing Divalent Cations
    Yoshihiro Shimizu, Tadahiko Harami, Shouhei Kakigi, Akizo Okuda
    1989 Volume 58 Issue 12 Pages 4273-4275
    Published: December 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4273
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    In KI crystals containing Mg2+, Ca2+, Sr2+ or Ba2+ ions, decay times of the luminescence are studied on the VLZ center which is one of the V-type centers produced by X-rays at 140 K. By the VLZ2-excitation(∼450 nm), the decay times of the luminescence observed near 1.5 μm were (4∼7)×10−6 sec at 70 K, depending upon the kinds of alkali earth ions. In KI(Ba2+), the decay time apparently decreased with increasing of temperature. The experimental results of the luminescence are interpreted in terms of the transition which occurs from an intermediate state to the ground state.
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  • Superconductivity of the t-t′-J Model
    Daijiro Yoshioka
    1989 Volume 58 Issue 12 Pages 4276-4279
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4276
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    The so-called t-t′-J model, i.e. t-J model together with the second- and the third-neighbor transfer terms, is investigated as a model for the high-Tc oxide superconductors. The exchange term is treated by the Schwinger boson mean field theory, and the transfer terms are treated by the second-order perturbation theory. It is shown that the spin fluctuation leads to an effective interaction between holes, the magnitude and sign of which depend on the sign of the second- and the third-neighbor transfer integrals. The interaction is strong enough to explain the high transition temperature of the oxides.
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  • Electronic States in High-Tc Copper-Oxide Superconductors
    Hisao Jichu, Tamifusa Matsuura, Yoshihiro Kuroda
    1989 Volume 58 Issue 12 Pages 4280-4283
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4280
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    The electronic states in the CuO2-layer have been studied by using the p-d model with the help of the bosonic technique for treating the local electronic correlation properly. What have been found are: at sufficiently low temperature the electronic states form coherent bands but there is a significant difference between the effects of electron doping and those of hole doping. In particular, the hole doping brings about a new band around the Fermi level inside the energy gap and intensity of the band increases as the number of holes increases. These band schemes may well explain the experiments.
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  • Pair States and Bound States of Solitons in an Ising-Like S=1⁄2 Antiferromagnet with a Weak Next-Nearest-Neighbor Interaction on a Linear Chain
    Fumitaka Matsubara, Sakari Inawashiro
    1989 Volume 58 Issue 12 Pages 4284-4287
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4284
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    The spin dynamics of an Ising-like S=1⁄2 antiferromagnet with a weak next-nearest-neighbor interaction on a linear chain is studied by a perturbation method. Bound states of two domain walls, i.e., 2-soliton bound states, are found in addition to soliton-pair states. When the next-nearest-neighbor interaction is ferromagnetic, the dynamical structure factor Sxx(k, ω) exhibits a sharp peak at a lower energy and a tail at higher energies. Our results are in good agreement with experimental observations of Sxx(k, ω) on CsCoCl3 and CsCoBr3 at low temperatures.
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  • Unenhanced Spin Susceptibility Consideration of the Spin Density Wave State in fcc Fe
    Kunitomo Hirai
    1989 Volume 58 Issue 12 Pages 4288-4291
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4288
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    Unenhanced spin susceptibility of fcc Fe is calculated for various wave vectors. The susceptibility has a maximum at a wave vector 2π⁄a(1, q, 0) with q∼7⁄48, which is close to the observed wave vector of spin density wave of fcc Fe precipitates. Characteristics of the susceptibility maximum are discussed in comparison with the case of Cr. It is found that in fcc Fe, the nesting of the Fermi surface hardly contributes to the determination of the position of the susceptibility maximum in contrast to Cr.
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  • Neutron Scattering Study of Antiferromagnetic Order in the Heavy Fermion CeInCu2
    Hiroaki Kadowaki, Setsuo Mitsuda, Hideki Yoshizawa, L. Rebelsky, S. M. ...
    1989 Volume 58 Issue 12 Pages 4292-4295
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4292
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    Neutron scattering experiment on a single crystal of the heavy-fermion system CeInCu2 demonstrated the occurrence of the magnetic order below 2 K which was found by the previous NMR measurement. The magnetic order is a short-range order of the type 1 structure of an fcc antiferromagnet in which moments parallel to (0 0 1) are modulated in the [0 0 1] direction. The moment estimated from the integrated intensity is μ=0.40±0.07 μB, which is about one half of the moment of the Γ7 ground state.
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  • Synthesis and Characterization of New Ternary Uranium Compound UCr2Al20
    Kiichi Okuda, Satoru Noguchi, Yasuhiro Nakazawa, Masayasu Ishikawa
    1989 Volume 58 Issue 12 Pages 4296-4299
    Published: December 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4296
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    A new U-based ternary compound UCr2Al20 was synthesized. The compound was characterized by X-ray diffraction, specific heat, magnetization and resistivity measurements. The low temperature electronic specific heat coefficient γ is estimated to be γ\simeq80 mJ/mol·K2. The magnetic susceptibility is slightly temperature dependent with the value χ\simeq2×10−3 emu/mol. The ratio χ⁄χcal, where χcal is calculated from γ, is about 2, which suggests that the compound is a magnetically exchange-enhanced system.
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  • Application of Finite Expansion in Elliptic Functions to Solve Differential Equations
    Gildemar C. Santos
    1989 Volume 58 Issue 12 Pages 4301-4309
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4301
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    In order to solve certain class of ordinary differential equation, its solution is expanded in finite power series of p(x) and dp⁄dx, where p(x) is any function satisfying (dp⁄dx)2=ΣKbkp(x)k. This power series systematically yields exact solutions of non-linear equations, such as the 5th KdV, Kuramoto, Fisher and other dispersive and diffusive equation.
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  • On Certain Homoclinic Soliton in Elastic Stability
    M. S. El Naschie
    1989 Volume 58 Issue 12 Pages 4310-4321
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4310
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    The possibility and consequences of two types of soliton in elastic stability namely loop and envelope soliton are discussed at some length. The main point here is that due to the homoclinic nature of these solitons, extreme sensitivity to initial conditions and asymptotic spacial chaos, as distinct from temporal chaos, may be anticipated. This in turn is related to some experimental observations in dynamical and quasi statical elastic systems.
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  • Normal Form of Nonlinear Schrödinger Equation
    Toshiyuki Kano
    1989 Volume 58 Issue 12 Pages 4322-4328
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4322
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    We develop an asymptotic theory of nonlinear dispersive wave where the nonlinear Schrödinger equation gives the leading order approximation. First, we define a normal form and show that the normal form takes an integrable form up to first order, but not to second order. Then, we study the interaction of two solitary waves of the normal form, and show that the interaction lead to the shift of soliton parameters.
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  • Hydrogen Coverage on W(001) Surface as a Dynamical System
    Takeshi Iizuka, Yasushi Iwata, Miki Wadati, Ken-ichiro Komaki
    1989 Volume 58 Issue 12 Pages 4329-4333
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4329
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    Time evolution of hydrogen coverage on a well defined tungsten surface detected by the nuclear reaction is discussed. A difference equation is proposed to describe a competition between the adsorption and desorption processes. Overshoot and oscillalion behaviors in the time variation of the hydrogen coverage are explained. A quantitative agreement between the experimental and theoretical results is observed.
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  • Jacobi Structures of the N-Soliton Solutions of the Nonlinear Schroedinger, the Heisenberg Spin and the Cylindrical Heisenberg Spin Equations
    Akira Nakamura
    1989 Volume 58 Issue 12 Pages 4334-4343
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4334
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    We have shown that the bilinear relations for the N-Soliton solutions can be reduced to the Jacobi relations of the matrix algebra in the case of the nonlinear Schroedinger, the Heisenberg spin and the cylindrical Heisenberg spin equations.
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  • Phase Boundary of an Ising Antiferromagnet
    S. Dasgupta
    1989 Volume 58 Issue 12 Pages 4344-4351
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4344
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    The phase boundary in the magnetic field—temperature (H-T) plane of an Ising antiferromagnet in a simple quadratic lattice is obtained by studying the zeros of the partition function in the complex temperature plane. The critical line in the weak field region is given by Tc(H)⁄Tc(0)=1−α×(mH⁄J)2, and the value of α is estimated from our numerical results and compared with previous determinations.
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  • Thermal Diffusion in a Lorentz Gas
    Kimie Nakashima, Naokata Takeyama
    1989 Volume 58 Issue 12 Pages 4352-4357
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4352
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    Regarding an isotropic Lorentz gas, thermal transport properties are discussed at the most elementary level. Lorentz’s original equations for heat and matter flows are reformulated in terms of kinetic quantities of dilute gases to clarify the nature of transport coefficients from the viewpoint of linear nonequilibrium thermodynamics including the Onsager reciprocal theorem. Especially referring to thermal diffusion properties of the Lorentz gas, Lorentz’s transport equations are studied by using the transported internal energy E** and the internal energy of transport E* which are connected with E**=E*+\barE, where \barE is the partial molecular internal energy. In this case, E*=kT⁄2 and \barE=(3⁄2)kT, and hence E**=2kT, using the Boltzmann constant k and the temperature T. A special case, E* being a constant activation energy of usual diffusion, is briefly discussed.
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  • Coherent-Anomaly Method Calculation on the Cluster Variation Method. I
    Koh Wada, Naotosi Watanabe
    1989 Volume 58 Issue 12 Pages 4358-4366
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4358
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    On the basis of the coherent-anomaly method (CAM) proposed by Suzuki, the static and dynamic critical exponents of the Ising model in the triangle and the square lattice are calculated using the cluster variation method (CVM) and the path probability method (PPM) devised by Kikuchi within analytical tractable approximations. The values of critical temperatures and critical exponents estimated from three approximations with different levels are generally reasonable. The two-dimensional results are also compared with those of the simple cubic lattice.
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  • Phase Diagram of Spin-1/2 Alternating Ferromagnetic Chain with XY-Like Anisotropy
    Satoru Yoshida, Kiyomi Okamoto
    1989 Volume 58 Issue 12 Pages 4367-4374
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4367
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    By the use of the numerical method we investigate the ground state phase diagram of spin-1/2 alternating ferromagnetic chain. We numerically diagonalized the Hamiltonian of finite systems (up to 20 spins) and analyzed the numerical data for various physical quantities using the finite size scaling and the extrapolation methods. The ground state is either the effective singlet (ES) state or the spin fluid (SF) state depending on the value of the alternation parameter δ and the anisotropy parameter Δ≡Jz⁄J⊥(Δ=−1 for the isotropic ferromagnetic case and Δ=0 for the XY case). The phase diagram obtained in this work strongly stupports the theoretical studies of Kohmoto-den Nijs-Kadanoff and Okamoto-Sugiyama. We also discuss the critical properties near the ES–SF transition line.
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  • Origin of CP Violation and Neutral K-System
    Yoshio Yamaguchi
    1989 Volume 58 Issue 12 Pages 4375-4387
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4375
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    CP violation effects in a neutral kaon system are described and their 2π and πlν decays are analyzed. According to this new analysis, CP violation in neutral kaons demonstrates the existence of CP violating, flavor conserving new interactions HX (C conserving) which couple only to quarks and whose effective strength in low energy regime is ∼10−3. Implications of HX in particle and nuclear physics are briefly discussed.
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  • Super-Hypernuclei in the Quark-Shell Model. II
    Hidezumi Terazawa
    1989 Volume 58 Issue 12 Pages 4388-4393
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4388
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    By following the previous paper, where the quark-shell model of nuclei in quantum chromodynamics is briefly reviewed, a short review of the MIT bag model of nuclei is presented for comparison and a simple estimate of the Hλ (“hexalambda”) mass is also made for illustration. Furthermore, an even shorter review of the “nucleon cluster model” of nuclei is presented for further comparison.
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  • Equilibrium Charge States of Incident Uranium Ions with Relativistic Velocity
    Shosuke Karashima, Ken-ichi Hino, Tsutomu Watanabe
    1989 Volume 58 Issue 12 Pages 4394-4403
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4394
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    Calculations are made for charge state distributions of U-ions at energies of 200-, 437- and 962-MeV/amu passing through low and high atomic number targets. The charge states of projectile ions are determined from a local equilibrium condition between electron loss and capture processes. Radiative electron capture (REC) as well as non-radiative one (NREC) is taken into consideration in the electron capture process. Both capture and loss cross sections are calculated by relativistic formalism incorporating of a strong Coulomb distortion of an electron due to a projectile ion. Resultant equilibrium charge states of U-ions are in reasonable agreement with experimental values, in particular at the incident energy 962 MeV/amu.
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  • Effects of Second Order Terms in Amplitudes on Analysis of Particle Tracking for Small Circular Storage Rings
    Haruhiko Takase
    1989 Volume 58 Issue 12 Pages 4404-4409
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4404
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    In the analysis of particle tracking for small circular storage rings, the equation of motion with perturbation terms up to the second order in betatron amplitude is derived by assuming a one-dimensional simple model and the effects are estimated in this paper. The difference of betatron number between the equation of motion with perturbation terms up to the second order and that up to the first order becomes increase, when the magnetic field index is larger than 0.6.
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  • Head-On Collision of Shallow-Water Solitary Waves near the Critical Depth Where Dispersion Due to Gravity Balances with That Due to Surface Tension
    Yoshinori Yamamoto
    1989 Volume 58 Issue 12 Pages 4410-4415
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4410
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    Head-on collision of identical shallow-water solitary waves near the critical depth where dispersion due to gravity balances with that due to surface tension is studied by means of numerical analysis. It is found numerically that the solitary waves retain their identity even after repeated collisions.
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  • Two-Dimensional Resonant Interaction between Long and Short Waves
    Masayuki Oikawa, Makoto Okamura, Mitsuaki Funakoshi
    1989 Volume 58 Issue 12 Pages 4416-4430
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4416
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    Two-dimensional resonant interaction between an internal gravity wave and a surface gravity wave packet in a two-layer fluid is investigated. The equations describing this interaction are derived. Modulational instability of a plane wave solution of the quations is discussed. Some interesting solutions which follow from a two-soliton solution to these equations are given.
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  • The Stability of Natural Convection in an Inclined Fluid Layer with Internal Heat Generation
    Masaki Takashima
    1989 Volume 58 Issue 12 Pages 4431-4440
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4431
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    Linear stability theory is applied to the problem of the stability of natural convection that occurs in an inclined fluid layer with uniformly distributed internal heat sources. It is assumed that the two bounding plates are maintained at constant and equal temperature. The power series method is used to obtain the eigenvalue equation which is then solved numerically with the aid of the Muller method. The stability conditions are obtained for Prandtl numbers ranging from 0.001 to 1000 and for angles of inclination ranging from 0° to 90°. It is found that the instability sets in as either transverse travelling wave modes or longitudinal stationary modes and three-dimensional disturbances are not responsible for instability.
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  • On the Propagation of Lower Hybrid Solitary Waves
    K. S. Goswami, S. Bujarbarua
    1989 Volume 58 Issue 12 Pages 4441-4444
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4441
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    A simple formalism for the lower hybrid solitary waves propagating almost perpendicular to the magnetic field is developed. It is found that for such a wave, usual K-dV type soliton solutions may be obtained when the plasma exhibits a non-Maxwellian distribution functions.
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  • Electron Motion in a Nonlinear Magnetosonic Wave Propagating Perpendicularly to a Magnetic Field
    Yukiharu Ohsawa
    1989 Volume 58 Issue 12 Pages 4445-4454
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4445
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    Electron motion is studied analytically and numerically. In the framework of the drift approximation, the electron motion is given by the sum of the E×B- and ∇B-drifts, The ∇B drift is anti-parallel to the Ex×B drift (Ex is the Iongitudinal electric field). For a strong magnetic field, the Ex×B drift dominates in the shock region. Full electron dynamics is then numerically studied, and basic patterns of electron motion are presented. For a rather strong magnetic field (ωce\gtrsimωpe), the Ex×B-drift speed can be close to the speed of light, and relativistic effects become important. Energies of energetic electrons are found to oscillate with amplitudes of the order of the electron rest mass energy. Qualitative explanation is given for the relativistic energy oscillation.
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  • Induced Scattering Due to Nonlinear Landau and Cyclotron Damping of Electromagnetic and Electrostatic Waves in a Magnetized Plasma
    Reiji Sugaya
    1989 Volume 58 Issue 12 Pages 4455-4478
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4455
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    General expressions of the matrix elements for nonlinear wave-particle scattering (nonlinear Landau and cyclotron damping) of electromagnetic and electrostatic waves in a homogeneous magnetized plasma are derived from the Vlasov-Maxwell equations. The kinetic wave equations obtained for electromagnetic waves are expressed by four-order tensors in the rotating and cartesian coordinates. No restrictions are imposed on the propagation angle to a uniform magnetic field, the Larmor radius, the frequencies, or the wave numbers. By electrostatic approximation of the dielectric tensor and the matrix elements the kinetic wave equations can be applied to the case in which two scattering waves are electrostatic or they are partially electrostatic. Further, the matrix elements in the limit of parallel or perpendicular propagation to the magnetic field are given.
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  • Production of Negative Ion-Rich Plasma by Using a Magnetic Filter in Oxygen
    Hiroshi Amemiya, Yoshiharu Nakamura
    1989 Volume 58 Issue 12 Pages 4479-4486
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4479
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    A negative ion-rich oxygen plasma is produced in the central region of a large volume chamber, in which multipole type plasma devices surrounded with magnetic filters are placed. The provision of the magnetic filters is effective to enrich negative ions. The ratio of the electron to the positive ion density is estimated from probe measurements to be 10−5 to 10−4. The plasma is useful to simulate the D-layer.
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  • On the Theory of Ferroelectric Susceptibilities
    J. F. Scott
    1989 Volume 58 Issue 12 Pages 4487-4490
    Published: December 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4487
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    Recently M. Tokunaga has published two interesting papers (J. Phys. Soc. Jpn. 56 (1987) 1653; 57 (1988) 4275) that relate the fluctuating polarizations pc in the paraelectric phases of ferroelectrics (estimated from the Curie constants determining the dielectric susceptibilities) and the spontaneous polarizations PS at low temperatures. The ratios of these polarizations were discussed in terms of self-consistent phonon theory. In the present paper these results are related to earlier studies by Jaynes and Wigner, by Mason and Matthias, and others.
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  • Rhodes-Wohlfarth Plot in Ferroelectrics —in Reply to Scott’s Comments—
    Masaharu Tokunaga
    1989 Volume 58 Issue 12 Pages 4491-4492
    Published: December 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4491
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    A few comments are added on the ferroelectric substances discussed by Scott (the preceding paper) with respect to the use of the Rhodes-Wohlfarth ratios, the ratio of the paraelectric moment to the saturated moment, in discussing the phase transition mechanisms of them. A remark is made also on the validity of using the magnitude of the transition entropy to discuss these mechanisms in ferroelectrics. The latest plot of these ratios is presented including newly some of the substances listed by Scott.
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  • Structural Phase Transitions in CH3NH3HgCl3
    Yoshihiro Ishibashi, Vladimir Dvorák
    1989 Volume 58 Issue 12 Pages 4493-4495
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4493
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    The phase transitions in CH3NH3HgCl3 are discussed in terms of the Landau-type thermodynamic potential, starting from a hypothesized prototypic phase of high symmetry. It has turned out that the reverse of relative stability of the monoclinic and the trigonal phases actually observed can be well interpreted.
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  • Dielectric, Elastic and Thermal Properties on a New Phase Transition in (CH3NH3)NaSeO4·6H2O
    Akio Miyazaki, Toshiyuki Ikeda, Toshio Osaka, Masaru Komukae, Yasuharu ...
    1989 Volume 58 Issue 12 Pages 4496-4500
    Published: December 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4496
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    Dielectric, ultrasonic, AC calorimetric and dilatometric measurements for (CH3NH3)NaSeO4·6H2O in addition to an X-ray examination were made. It was found that the crystal undergoes a phase transition of the second order at 136.9 K (Tc). The crystal at room temperature belongs to a point group 6mm with the unit cell parameters: a=7.36 Å, c=13.0 Å and Z=2. Both the specific heat Cp and the linear thermal expansion coefficients along the a and c axes, α11 and α33, show λ-type anomalies with anomalous tails near Tc. The dielectric constant along the a axis shows an anomalous break at Tc. The dielectric constant along the c axis and the elastic stiffnesses c33E, c44E and c66 do not show remarkable anomaly at Tc, while c11E shows a small anomaly near Tc, which corresponds to the λ-type anomalies observed in both Cp and αii(i=1, 3) near Tc.
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  • Investigation of Incommensurate Phases of the “Twiny” Gradient Form as Compared with Incommensurate Phases of the Simple Gradient Form
    Kêitsiro Aizu
    1989 Volume 58 Issue 12 Pages 4501-4510
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4501
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    It is assumed that the order parameters are two or more pairs {Qα, Q*α}, {Qβ, Q*β}, …. For those terms in the free energy function which are linear in ∂z and quadratic in Q, two different forms, (Qα*∂zQα−Qα∂zQα*)+… and (Qβ*∂zQα−Qα∂zQ*β)+…, can be conceived. The latter (twiny) form is rarer than the former (simple) form. Just like terms of the simple form, terms of the twiny form can generate incommensurateness. Consider phases derived from a common prototype. The highest-point-symmetried one of the incommensurate phases of the simple gradient form belongs to the prototype point group and hence is nonferroelectric, whereas the highest-point-symmetried one (temporarily called phase α) of the incommensurate phases of the twiny gradient form can be ferroelectric. It is possible that on cooling, the prototypic phase makes a second-order transition to phase α. The details are clarified by study of a specific case in which the simple and twiny forms both appear.
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  • Evaluation of Surface Roughness Parameters of Metal Films by Light Scattering Technique
    Yoshiki Naoi, Masuo Fukui
    1989 Volume 58 Issue 12 Pages 4511-4516
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4511
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    Light scattering is a powerful method to evaluate surface roughness parameters. From the information on radiation produced by the surface roughness we are able to get a pair of roughness parameter, i.e. the amplitude of surface corrugation and the transverse correlation length. However, the parameters evaluated by such a way cannot explain the whole angular distribution of scattered light intensity. We show that the angular distribution of scattered light intensity can be properly explained by a combination of several parameters.
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  • Electronic and Lattice Structures of Isolated Se Chains and Defects in Them. I. A Semi-Empirical Model and Properties of Regular Se Helix
    Atsushi Ikawa, Hideo Fukutome
    1989 Volume 58 Issue 12 Pages 4517-4533
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4517
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    We make a semi-empirical model for chains of Se based on the INDO and MINDO type models. It includes some other elements to mimic Se chains enclosed in channels of mordenite crystals (M–Se). With this model we calculate the electronic and lattice structures of isolated Se chains under the unrestricted Hartree-Fock approximation. The model gives a helical structure and a band gap of a long Se chain consistent with data of M–Se. The band gap and width in finite chains have chain length dependences. The calculated rotational potential shows that the helical structure is considerably soft against fluctuations of dihedral angles. The rotational potential has another minimum to make a kink in the helix. The kink has no gap level. A long regular planer zigzag chain is unstable and remains to be semiconducting. The stabilization mechanism of the helical structure is elucidated.
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  • XPS and UPS Studies of Valence Fluctuation and Surface States of Yb4As3, Yb4Sb3 and Yb4Bi3
    Shigemasa Suga, Susumu Ogawa, Hirofumi Namatame, Masaki Taniguchi, Aki ...
    1989 Volume 58 Issue 12 Pages 4534-4543
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4534
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    X-ray and vacuum ultraviolet photoemission spectra were measured for valence fluctuating Yb4X3 (X: As, Sb and Bi) by use of Mg Kα and synchrotron radiation source. From the line shape analysis of the Yb 4f spectra, the mean valence is evaluated as 2.32, 2.34 and 2.10 for Yb4As3,Yb4Sb3 and Yb4Bi3. The surface Yb 4f level shift is estimated as 0.65, 0.63 and 0.59 eV, respectively. The plasmon satellite is confirmed in the Yb 4f and Yb 4d core XPS spectra of Yb4Bi3 in contrast to those in Yb4As3 and YbAs. As for the anionic states, the Bi 5d core UPS spectrum showed a remarkable asymmetry in contrast to the rather symmetric Bi 4f core XPS spectrum. This result suggests a contribution of the surface Bi 5d state at larger binding energies of about 0.5 eV.
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  • Crystal-Field Effects on the Periodic Anderson Model by Gutzwiller Approximation
    Makoto Yamashita, Norio Kawakami, Ayao Okiji
    1989 Volume 58 Issue 12 Pages 4544-4551
    Published: December 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4544
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    The crystal-field effects on the periodic Anderson model are investigated by means of the Gutzwiller approximation. The effective mass, the spin susceptibility and the generalized charge susceptibilities are numerically evaluated in the Kondo regime for three different kinds of simple level schemes. It is shown that former two quantities are considerably enhanced as the crystal-field splitting is increased. In the sufficiently large splitting regime, the analytic expression for the mass-enhancement factor is obtained, which is similar to that for the Kondo temperature in the impurity Anderson model.
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  • Transport Property and de Haas-van Alphen Effect in YCu2
    Yoshichika \={O}nuki, Takehiko Omi, Yoshiko Kurosawa, Kazuhiko Satoh, ...
    1989 Volume 58 Issue 12 Pages 4552-4556
    Published: December 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4552
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    We have measured the electrical resistivity, Hall coefficient, magnetoresistance and de Haas-van Alphen effect in YCu2. This substance is found to be a compensated metal with equal carrier concentration of electrons and holes. Fermi surface is found to be a multiply connected one constructed by many cylindrical arms. Open orbits exist along the b- and c-axes.
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  • Proximity Induced Meissner Effect in Dirty Normal Metals
    Osamu Narikiyo, Hidetoshi Fukuyama
    1989 Volume 58 Issue 12 Pages 4557-4568
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4557
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    Temperature dependences of the proximity induced Meissner diamagnetization in dirty normal metals are calculated by use of the Usadel equation. Besides the effect of the normal impurity scattering, that of the magnetic one is investigated. Especially the Kondo effect is examined based on the Anderson Hamiltonian employing a scheme that interpolates magnetic and non-magnetic behaviors, and a crossover between these two has been described.
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  • Kondo Effect on Josephson Critical Current in SNS Proximity System
    Osamu Narikiyo, Hidetoshi Fukuyama
    1989 Volume 58 Issue 12 Pages 4569-4575
    Published: December 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4569
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    The Kondo effect on the Josephson critical current in SNS proximity systems is investigated. The temperature dependence of the critical current is calculated by use of the extended Usadel equation for arbitrary Kondo temperatures and it is found that the critical current exhibits an anomalous behavior at around the Kondo temperature. The possible implication to high Tc oxide superconductors is discussed.
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  • Vertex Correction to RPA and Superconductivity in the Two-Dimensional Hubbard Model
    Kenji Yonemitsu
    1989 Volume 58 Issue 12 Pages 4576-4599
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4576
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    In the two-dimensional Hubbard model with the electron density nearly half-filled, RPA treatments resulted in d-wave superconductivity. We study how a vertex correction affects electronic self-energy part, thereby, superconducting transition temperature. The normal state self-energy part is estimated at the lowest temperature which can be reached numerically. The anomalous self-energy part is assumed to be frequency independent but its momentum dependence is determined without any restrictions. It has a large amplitude near the Fermi line and a d-wave symmetry, since there are strong scatterings near momentum transfers Q=(±π, ±π), lattice constant being taken to be unity. The vertex correction enhances these scatterings to increase the transition temperature by several times. The effective mass is also increased by a few percent. The frequency dependence of the anomalous self-energy part is found to give a small correction.
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  • Ground State and Excitation Spectrum of a Spin-1/2 Ising-Like Ferromagnetic Chain with Competing Interactions
    Jun-ichi Igarashi
    1989 Volume 58 Issue 12 Pages 4600-4609
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4600
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    Excitation spectrum as well as ground states is studied in detail in the region near the Ising limit with small XY-component in a Heisenberg ferromagnetic chain with competing antiferromagnetic second-neighbor interaction. A spin-fluid-like phase with gapless excitation spectrum, which exhibits ferromagnetic long-range order, is derived in the intermediate region between the saturated ferromagnetic and (2, 2) antiphase states, by mapping onto a system of Bose-like particles with hard core of finite radius. Expressions for the magnetization, the susceptibility and the dispersion relalion of the excitation spectrum are obtained in the intermediate phase. This mapping is expected to be exact in the region near the degenerate point.
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  • Cu Nuclear Magnetic Relaxation Studies of the Antiferromagnetic Heavy-Electron Compound UCu5
    Shigeru Takagi, Tamotsu Homma, Tadao Kasuya
    1989 Volume 58 Issue 12 Pages 4610-4615
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4610
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    Cu nuclear magnetic relaxation rate 1⁄T1 has been measured in the antiferromagnetic heavy-electron compound UCu5 (TN=15 K) in the paramagnetic state under zero external field by NQR technique. At high temperatures 1⁄T1 tends toward a constant, whereas on approaching TN it shows marked critical divergence, which has been found close to T1T∝(T−TN)0.4. An analysis has been made in terms of an exchange-coupled Kondo-impurity model, and the divergent behavior has been shown to be not incompatible with the model. At high temperatures, neglecting the q-dependences in χ(q, ω) and taking account of the neutron quasielastic linewidth at 50 K, the relaxation rate of U moments has been deduced. The large relaxation rate and its strong temperature-dependence suggest both the strong hybridization between 5f and conduction electrons and the dominance of the single-site dynamics in the U moment relaxation in UCu5.
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  • Electrical Conductivity and Dielectric Studies in CsCuCl3
    R. Lakshmi Narayan, S. V. Suryanarayana
    1989 Volume 58 Issue 12 Pages 4616-4619
    Published: December 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4616
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    The present work reports experimental results on polycrystalline pellet of CsCuCl3 employing d.c. conductivity (σ), dielectric constant (ε) and loss (tan δ). The conductivity data was collected in the temperature range 390–660 K and dielectric constant (ε) and loss (tan δ) have been measured in the frequency range from 5 kHz to 100 kHz at room temperature. The activation energy for conduction has been evaluated from the plot log σT versus 103⁄T.
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  • Phonon Sidebands of ν00 Line in Absorption and Luminescence Spectra of NaNO2: Spatial Dispersion of ν00 Exciton
    Masaaki Ashida, Yoshizo Kawaguchi, Riso Kato
    1989 Volume 58 Issue 12 Pages 4620-4625
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4620
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    Profiles of the phonon sidebands associated with the ν00 line in the singlet absorption and luminescence spectra of NaNO2 have been investigated by the measurement of high resolution spectra at 2 K. It is confirmed that energy separations of prominent peaks of the absorption sideband from the ν00 line are larger than those of the corresponding peaks of the luminescence sideband by 2∼9 cm−1. From the result the band width of the ν00 exciton is estimated to be 3∼5 cm−1. Profiles of vibronic lines in the luminescence spectrum are discussed in connection with the spatial dispersion of the ν00 exciton.
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  • Theory of 4f→3d X-Ray Emission Spectra in La and Ce Compounds
    Satoshi Tanaka, Yosuke Kayanuma, Akio Kotani
    1989 Volume 58 Issue 12 Pages 4626-4634
    Published: December 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4626
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    Theory of X-ray emission spectroscopy (XES) corresponding to the 4f→3d electronic transition in insulating La and Ce compounds is presented. The spectra are calculated with the impurity Anderson model by taking into account the spin and orbital degeneracies and by applying a formula of coherent second order optical process. It is shown that the spectral features of the 4f→3d XES are very sensitive to the differences in the 4f electron populations in these rare-earth materials, because the 4f electron directly participates in the radiative process.
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  • Exponents in the Theory of the Soft X-Ray Threshold Anomaly of Heavy Alkali Metals
    Yoshihiro Ohmura, Akinobu Ogiwara
    1989 Volume 58 Issue 12 Pages 4635-4642
    Published: December 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.4635
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    The threshold exponents α0 of anomalous soft X-ray absorption spectra of heavy alkali metals in the theory of Nozières and De Dominicis are calculated. Special attention is paid on Cs where the value of α0 is obtained experimentally as 0.06∼0.07 which is considerably smaller than α0 for K and Rb. By a proposed model for Cs that the localized 4f orbital is pulled in by the 5p hole that is created by absorption of soft X-rays, resulting in the screening of the 5p hole, we obtained the value of α0 to be 0.05, in agreement qualitatively with the experimental results. For K and Rb, the obtained values for α0 by the present study are 0.27 and 0.25, respectively, in satisfactory agreement with the experimental results.
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