Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
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Volume 62, Issue 3
Displaying 1-36 of 36 articles from this issue
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  • Robust Nature of Dispersionless Envelope Lattice Solitons and Their Propagation in One-Dimensional Disordered Nonlinear Lattices
    Shozo Takeno, Shigeo Homma
    1993 Volume 62 Issue 3 Pages 835-838
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.835
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    Unique properties of envelope lattice solitons with dispersionless carrier-wave frequency exhibiting a robust nature and relaxed existence conditions are elucidated. This is done for a modified version of the Ablowitz-Ladik equation defined in a d-dimensional simple cubic (SC) lattice. Two methods are used: one is analytical for the ordered SC lattice and the other, numerical for a disordered one-dimensional lattice. In the former, a localized-mode concept is employed to show the relaxed existence condition for lattices of arbitrary dimension. In the latter, numerical experiments are performed to show fairly smooth propagation of dispersionless solitons even for strongly disordered cases, where ordinary solitons with dispersive carrier-wave frequency eventually settle down to immobile localized modes.
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  • Fractional Quantum Hall States in Narrow Channels
    Daijiro Yoshioka
    1993 Volume 62 Issue 3 Pages 839-842
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.839
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    A model system is considered where two dimensional electrons are confined by a harmonic potential in one direction, and are free in the other direction. The ground state in strong magnetic fields is investigated through numerical diagonalization of the Hamiltonian. It is shown that the fractional quantum Hall states are realized even in the presence of the external potential under suitable conditions, and a phase diagram is obtained.
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  • Higher Harmonic Cyclotron Resonance of Holes near Electron-Hole Droplets in Germanium
    Tatsumi Kurosawa, Norihisa Ishida
    1993 Volume 62 Issue 3 Pages 843-846
    Published: March 15, 1993
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.843
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    The origin of pronounced third harmonic signals of heavy holes in germanium observed in optically detected cyclotron resonance experiments is discussed. It is shown that strong higher harmonic cyclotron acceleration is possible for holes through a nonuniform field due to an electric dipole moment induced by the microwave field on an electron-hole droplet.
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  • Ground-State Quantum Monte Carlo Method Applied to Alternating-Bond Spin Chains
    Naomichi Hatano, Masuo Suzuki
    1993 Volume 62 Issue 3 Pages 847-850
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.847
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    A world-line Monte Carlo method of studying the ground state of a quantum system is proposed. An application of the method to the one-dimensional S=1⁄2 alternating-bond model is reported. Anisotropy dependence of order parameters suggesting ground-state phase transitions is observed.
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  • Hamiltonian Structure and Dynamical System Associated with the BKP Heirarchy
    Chandana Ghosh, A. Roy Chowdhury
    1993 Volume 62 Issue 3 Pages 851-853
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.851
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    Conserved quantities and the Hamiltonian structure associated with BKP equation are deduced with the help of pseudodifferential operators in (2+1) dimension and dressing technique. It has been proved that the restricted flows in one dimension corresponds to the integrable Henon-Heiles dynamical system.
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  • From Anyon Gauge Fields on a Plane to Anyon Gauge Fields on a Torus
    Takashi Yamamoto
    1993 Volume 62 Issue 3 Pages 854-858
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.854
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    The statitical interactions of anyons on a plane are described by a gauge field. We present a natural periodic generalization of such gauge field and find that this agrees with the corresponding gauge field on a torus which has been obtained from the Chern-Simons theory.
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  • Envelope Soliton Fission Due to Reflectionless Inhomogeneity
    Hiroaki Ono
    1993 Volume 62 Issue 3 Pages 859-867
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.859
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    Modulation of one-dimensional anharmonic lattice waves due to reflectionless inhomogeneity is shown to be governed by the inhomogeneous nonlinear Schrödinger equation. Based upon that equation, the behavior of envelope solitons in a step-like inhomogeneity is investigated. Unlike a dicontinuous mass interface, such a gradual mass interface is found not to lead to fission of an envelope soliton of bright type, but inhomogeneity of spring constants do. Explicit formulas concerning the fission of a weak envelope soliton of dark type are also derived.
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  • Asymptotic Behavior of Spin-Pair Correlation Function of Ising Model on Generalized Kagomé Lattice
    Kazuyuki Tanaka, Tohru Morita
    1993 Volume 62 Issue 3 Pages 868-872
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.868
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    The asymptotic behavior of the spin-pair correlation function and the spontaneous magnetization of the Ising model on the generalized Kagomé lattice is obtained. The nature of the disordered points is clarified for this system.
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  • Diagrammatical Techniques for Two-Dimensional Ising Models. III. Ising Model to Vertex Model
    Tohru Morita, Kazuyuki Tanaka
    1993 Volume 62 Issue 3 Pages 873-879
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.873
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    It is shown that an application of the techniques of division and integration of lattice sites reduces Ising models to equivalent vertex models. When the Ising model is on a two-dimensional lattice and no crossing occurs for any two of line segments connecting two lattice sites between which an interaction exists, the equivalent vertex model is shown to be a free-fermion vertex model. An argument is also given to show that the present method provides a method of expressing the partition function of a general Ising model on the square lattice, with noncrossing interactions within a square plaquette, in terms of a determinant of a 4×4 matrix.
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  • Thermodynamic Properties of Antiferromagnetic Quantum XY-Model on the Triangular Lattice
    Shigeo Homma, Hirotsugu Matsuda, Naofumi Ogita, Kazuhiro Sano
    1993 Volume 62 Issue 3 Pages 880-887
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.880
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    Thermodynamic properties of antiferromagnetic quantum XY-model (s=1⁄2) on a triangular lattice are studied by the Decoupled Cell Monte Carlo Method (DCM). The decoupled cell (DC) used in this study consists of 7 spins. The size N of systems are 15*15, 30*30, 45*45, respectively. Detailed studies of spin pair correlation functions for both x- and z-components are performed at various temperatures. The results suggest that the existence of the shortrange three sublattice structure. The mean square magnetization of a sublattice for the x-component does not depend on N, whereas that of the z-component shows a strong dependence on N below a certain temperature.
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  • Study on the Level Structure of 110Cd Populated by the Beta Decay of 110mAg
    L. L. Kiang, P. K. Teng, G. C. Kiang, W. S. Chang, P. J. Tu
    1993 Volume 62 Issue 3 Pages 888-897
    Published: March 15, 1993
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.888
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    The excited states of 110Cd populated by the beta decay of 110mAg have been studied extensively. With a HpGe–NaI(Tl) Compton suppression spectrometer 64 γ-rays are observed and identified. Coincidence spectra and eight γ-γ directional correlation functions are obtained with a HpGe–HpGe coincidence circuit. IBA and BSDI calculations are presented to discuss the energy levels as well as the B(E2) ratios of the γ-transitions.
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  • Magnetic Moments of Nuclei from Proton Stripping Reactions
    B. S. Bains, R. K. Bansal
    1993 Volume 62 Issue 3 Pages 898-900
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.898
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    Magnetic dipole sum rules for proton stripping reactions have been applied to calculate the magnetic moments of some targets. The spectroscopic factors from stripping reactions data have been used as input parameters in the sum rule equations.
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  • K-Capture Probabilities to the Excited States of 152Sm in the Decay of 152Eu
    Kawaldeep, Vijay Kumar, K. S. Dhillon, K. Singh
    1993 Volume 62 Issue 3 Pages 901-910
    Published: March 15, 1993
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.901
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    Intensities of strong and weak gamma radiations emitted in the decay of 152Eu have been measured using a 96.0 cm3 HPGe detector. Summing corrections due to cascading gamma rays have also been applied. Some new weak transitions reported earlier have been confirmed and some of them have been rejected by carefully analysing gamma ray single spectra. The measured gamma ray intensities were used to determine K-capture probabilities to the excited states of 152Sm by KX-ray-gamma-ray sum coincidence methods.
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  • Polarization Interferometry of X-Ray Diffraction
    Kouhei Okitsu
    1993 Volume 62 Issue 3 Pages 911-917
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.911
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    A new type of X-ray diffraction interferometry is described, in which σ- and π-polarized X-rays diffracted by a sample crystal interfere with each other. A reversal of image contrast in ‘polarization interference topograph’ due to contrary sign of a spherical strain field in a crystal is demonstrated in terms of numerical simulations by Takagi-Taupin’s dynamical theory. Further, a feasibility of ‘polarization holography’ of X-ray diffraction is pointed out.
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  • Optical Bistability in Prism/Ag Film/Nonlinear Film/Air Geometry by Utilizing Surface Plasmon and Guided Wave Characteristics
    Toshihiro Okamoto, Masanobu Haraguchi, Masuo Fukui, Hiroshi Kawakami, ...
    1993 Volume 62 Issue 3 Pages 918-925
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.918
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    We have numerically investigated optical bistability (OB) in a TaFD9 prism/Ag film/PDA-4BCMU film/air geometry. 4BCMU films are dealt as nonlinear optic films with Kerr nonlinearity. In the geometry of our interest surface plasmon polaritons and guided waves can be excited. Numerical calculations have been carried out for TE- and TM-polarized incident lights. In the case of guided waves the critical power density required for OB is less than 1 W/cm2 under a certain condition. This is a promising value to realize actual optic devices.
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  • Real and Pseudo Kolmogorov Constant
    J. Qian
    1993 Volume 62 Issue 3 Pages 926-932
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.926
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    Two possible reasons are analyzed to explain why the Kolmogorov constant, obtained by direct numerical simulations and large-eddy numerical simulations conducted in recent years, is a pseudo Kolmogorov constant which is appreciably higher than the real (or theoretical) Kolmogorov constant. Firstly, the viscous effect dies away slowly as the wavenumber decreases and persists outside the narrow range near the Kolmogorov wavenumber. Secondly, the resolution of the numerical simulations is limited (e.g. 1283) and the observed k−5⁄3 range is narrow, so long-range triad interactions are excluded. In order to obtain the real Kolmogorov constant as well as to observe the Kolmogorov inertial subrange in numerical simulations, the resolution of simulations must be much higher than 1283.
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  • Davey-Stewartson Equation and Properties of Dromion
    Takenobu Nakao, Miki Wadati
    1993 Volume 62 Issue 3 Pages 933-947
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.933
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    Davey-Stewartson equation of type one (DS1 equation) is studied by the inverse scattering method. The Riemann-Hilbert problem is derived from the scattering problem for the DS1 equation. Dromion solutions are obtained and their properties are investigated.
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  • Frequency Response Analysis for the Secondary Electron Release by Metastables in Ionization Current Multiplication in N2 Gas
    Kanji Tsurugida, Nobuaki Ikuta
    1993 Volume 62 Issue 3 Pages 948-958
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.948
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    The effect of secondary electron emission from the cathode on the ionization current multiplication in the non-self-sustaining Townsend condition is investigated adopting the frequency response method. Measurement is carried out in N2 gas and the property of N2(A3Σu+) metastable molecules is analysed discriminating it from other secondary processes due to ions and photons in the frequency domain. The results are consistent with the data of transient current analyses. The frequency response method may be valid for the detailed analyses of the secondary processes in the total ionization current system.
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  • Hydrogen and PO4 Modes of RbH2PO4
    Akane Agui, Yusuke Nakai, Kohji Mizoguchi, Susumu Ikeda, Yasunori Tomi ...
    1993 Volume 62 Issue 3 Pages 959-964
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.959
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    Hydrogen and PO4 modes in RbH2PO4 (RDP) have been investigated by inelastic neutron scattering and Raman scattering experiments. Two large peaks at 124 meV and 159 meV in neutron scattering spectra are confirmed to hydrogen modes by comparing with Raman scattering spectra. These peak widths change around the ferroelectric phase transition temperature. This is considered to be due to the order or disorder of the PO4 tetrahedrons which affect the motion of hydrogen atoms.
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  • A Second Type of Prototypic to Ferroelectro-Incommensurate Transitions When the Number of Proper Order Parameters is One
    Kêichiro Aizu
    1993 Volume 62 Issue 3 Pages 965-969
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.965
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    This paper proposes a second type of transitions from prototypic phases to simultaneously incommensurate and ferroelectric phases when the number of proper order parameters, Np, equals one. This type differs from the first type in the following respects: In the second type, the number of subsidiary order parameters equals two (not one), the gradient-linear term is second degree (not third degree) with respect to the order parameters, and the transition can be second order (not must be first order). The \bar4m2-A2-E case, where A2 is the irreducible representation for the proper order parameter and E for the subsidiary order parameters, is investigated as exemplifying the second type. Although the reverse case, i.e., the \bar4m2-E-A2 case has Np≠1, it is also investigated for the sake of comparison.
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  • Monte Carlo Twist Method Applied to the Two-Dimensional Ising Antiferromagnets in Magnetic Fields: Tests of the Method and Critical-Point Amplitudes
    Hideo Shioda, Yohtaro Ueno
    1993 Volume 62 Issue 3 Pages 970-980
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.970
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    We apply our Monte Carlo twist method to the antiferromagnetic Ising model on square lattices in several uniform fields imposing fixed boundary conditions. We have estimated the critical temperature Tc and critical exponent ν at each field. The former well agree with the analytic results of Müller-Hartmann and Zittartz, and the latter are all close to ν=1. We have calculated the finite-size critical-point amplitude of the interfacial free energy Ξ0 which is believed to be universal. Our estimate of Ξ0 at zero field is in good agreement with the analytic result of Abraham and Svraki\'{c}. We also report for the first time estimates of Ξ0 at finite fields. Further, comparison is made with results of Mon and Jasnow.
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  • Aggregation at Early Stage of Growth in Thin Films
    Takashi Nagatani
    1993 Volume 62 Issue 3 Pages 981-989
    Published: March 15, 1993
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.981
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    A growth model is presented to simulate the diffusion-limited aggregation pattern appearing in the formation process of thin films deposited by sputtering or evaporation. In the submonolayer range of deposits, aggregates are controlled by the sticking probability of sputtered (or vaporing) particles, the ballistic motion of particles and Brownian motion of particles on the deposition plate. By using computer simulation it is found that the deposit at early stage of growth becomes a quasi-two dimensional structure extending on the deposition plate at a typical height of a few particles. The pattern obtained by the computer simulation is similar to that found in experiments. A top view of the structure of clusters deposited on the plate shows the DLA fractal at low particle numbers. The cluster-size distribution ns(t) obeys the dynamic scaling: ns(t)≈tws−τf(s⁄tz) (τ=0.92±0.03, z=0.34±0.01, and w=0.58±0.03) where the cutoff function f(x) is a constant for x<<1. The scaling structure of the deposit shows a characteristic property definitely different from those of the diffusion-limited cluster-cluster aggregation (CCA).
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  • Amplitude Mode around a Moving Soliton in Polyacetylene
    Makoto Kuwabara, Yoshiyuki Ono
    1993 Volume 62 Issue 3 Pages 990-996
    Published: March 15, 1993
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.990
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    Amplitude mode around a moving soliton in polyacetylene is studied by the numerical simulations of the motion of the charged soliton in an external electric field within Su, Schrieffer and Heeger’s model. Its shape is visualized by numerically subtracting the Goldstone mode from the time derivatives of the lattice displacements, which are thought to be decomposed into linear normal modes around the (moving) soliton. The frequency of the amplitude mode as a function of the soliton velocity is estimated from the oscillations of the soliton width and the lattice potential energy, the latter oscillation being considered to be induced mainly by the amplitude oscillation. The frequency is found to increase as the velocity deviates from zero.
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  • Dragging a Charge-Density-Wave Soliton by an Electromagnetic or Acoustic Wave
    Boris A. Malomed
    1993 Volume 62 Issue 3 Pages 997-1000
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.997
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    It is demonstrated that a traveling electromagnetic or acoustic wave drags a phase soliton in a nearly commensurated CDW conductor at a velocity proportional to the square of the wave’s amplitude. The traveling-wave-induced drift of the charged soliton gives rise to specific photoelectric (actually, radioelectric) and acoustoelectric effects in the conductor containing “frozen” unipolar solitons. These effects can be used to indirectly detect the CDW solitons, and to estimate their size (the cutoff wavelength of the driving wave coincides with a characteristic size of the soliton).
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  • Critical Anomaly in Thermopower near the Spin-Density-Wave Transition in Quasi-One-Dimensional Conductors, (DMET)2AuI2 and (DMET)2Au(CN)2
    Kazuya Saito, Harukazu Yoshino, Koichi Kikuchi, Keiji Kobayashi, Isao ...
    1993 Volume 62 Issue 3 Pages 1001-1005
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.1001
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    The thermopowers of (DMET)2AuI2 and (DMET)2Au(CN)2 were measured between liquid helium and room temperatures. In addition to the metallic thermopower above the SDW transition temperature (16 and 24 K for (DMET)2AuI2 and (DMET)2Au(CN)2, respectively), a large excess contribution probably due to the SDW fluctuation was detected below about 70 K.
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  • Flux Pinning Mechanism of High-Tc Y–Ba–Cu–O Superconductor Containing Artificial Pinning Centers Y2BaCuO5
    Kenichi Tenya, Hideki Miyajima, Yoshichika Otani, Yuuichi Ishikawa, Sh ...
    1993 Volume 62 Issue 3 Pages 1006-1016
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.1006
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    Magnetic field and temperature dependences of magnetic torque and magnetic relaxation were investigated on Y–Ba–Cu–O superconducting systems containing Y2BaCuO5 artificial particulate precipitates. Two different types of pinning forces were found to act on fluxoids. One is the intrinsic pinning force due to a layered structure of Cu–O planes and the other is the extrinsic pinning force due to Y2BaCuO5 precipitates. The intrinsic pinning force is effective when the applied magnetic field is lying within an angle Δθ out of the Cu–O planes. The pinning potential obtained from the magnetic relaxation measurements is expressed by the form of log (Jc⁄j) where j is the shielding current density. The pinning mechanism is discussed in terms of the planar pinning at the precipitates and the transformation of fluxoid lines from stepwise to linear.
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  • Normal-State Uniform Magnetic Susceptibility and Superconductivity in Bi2SrzCa3−zCu2Oy
    Takayuki Iwamatsu, Hiromoto Uwe
    1993 Volume 62 Issue 3 Pages 1017-1024
    Published: March 15, 1993
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.1017
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    Superconductivity and the normal-state uniform magnetic susceptibility for Bi2SrzCa3−zCu2Oy (z=1–2) have been studied. Tc and the oxygen content y stay nearly constant with z, while the magnetic property exhibits a remarkable variation. The temperature dependence of the susceptibility exhibits a broad maximum at Tmax, which increases from 70 K to ca. 300 K with decreasing z from 2.0 to 1.0. Since the lattice parameter along the c-axis decreases remarkably with decreasing z, while those along the a and b axes remain nearly constant, the antiferromagnetic coupling between Cu spins in adjacent CuO2 layers is suggested. The constant Tc with the remarkable change of the magnetic properties implies inappropriateness of the spin-fluctuation mechanism for the high-Tc superconductivity.
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  • NMR Studies of Reentrant Spin Glass Phase in Random Mixture Co1−xMnxCl2·2H2O with Competing Exchange Interactions
    Kazuko Zenmyo, Hidenori Kubo
    1993 Volume 62 Issue 3 Pages 1025-1030
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.1025
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    The detailed magnetic phase boundary between antiferromagnetic and reentrant spin glass phases is determined by the (dis) appearance of a satellite line in NMR spectra caused by protons in a spin glass state. Transition temperatures for compositions around x=0.6 are found to be lower than the transition temperatures in other concentration regions. In the intermediate concentration region between x=0.47 and x=0.73, a Co-type antiferromagnetic ordering coexists with a Mn-type ordering. The quantity of spins in a spin glass state is estimated from relative intensities of a main line and its satellite lines. This is found to be about 40±10% of the total spins at 1.45 K, for 0.47\lesssimx\lesssim0.73.
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  • X-Ray Photoemission Spectroscopic Study of Impurity Effect and d-Band Formation Induced by the Substituted 4d Transition Metal Atoms in Ni1−xRhxS
    Takeshi Mamori, Masanori Matoba, Shuichiro Anzai, Atsushi Fujimori
    1993 Volume 62 Issue 3 Pages 1031-1036
    Published: March 15, 1993
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.1031
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    The effect of Rh substitution on the electronic structure of charge transfer type compound NiS is studied by XPS. We find the following results. (1) A narrow band is newly superimposed on the main peak (d8L) of NiS in the valence band region and its width increases with x. (2) The peak position and the line shape of Rh 3d core level spectra are very close to that of Rh metal. (3) The S 2s and the S 2p3⁄2 core level peaks shift toward higher binding energy (EB) with increasing x. (4) The Ni 2p3⁄2 core level main peak (d9L) shifts toward lower EB with increasing x. (5) The EB separation of the Ni 2p3⁄2 main and satellite peaks decreases as x increases, while the relative intensity of the latter peak to the former one increases. We suggest a tentative model that a Mott-Hubbard type metallic d-band is superimposed on charge transfer type host NiS, and that this contribution is one of the electronic origin for dTt⁄dx<0 reported previously. The origin of the metallic band is attributed to the Rh–Rh and/or Ni–Rh interactions in Ni1−xRhxS.
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  • 119Sn NMR Studies of the Heavy-Electron Compound U3Au3Sn4
    Shigeru Takagi, Hiroyuki Suzuki, Takashi Kusumoto
    1993 Volume 62 Issue 3 Pages 1037-1043
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.1037
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    We have performed the 119Sn NMR, magnetic susceptibility, electrical resistivity and Hall effect measurements on a recently discovered heavy-electron compound U3Au3Sn4. The system is found to be in the incoherent Kondo state above about 40 K. Even under the presence of a large residual resistivity, the onset of coherence in the electronic system becomes evident below about 20 K in both ρ(T) and RH(T), but it does not manifest itself in T1−1(T). Observed almost T-independent T1−1(T) below about 20 K, however, is not considered as due to development of strongly q-dependent spin fluctuation (SF), since an analysis in terms of the Wilson ratio rather suggests a localized character of the SF.
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  • The 90°-Wall in the Tetragonal Phase of BaTiO3-Type Ferroelectrics
    Yoshihiro Ishibashi
    1993 Volume 62 Issue 3 Pages 1044-1047
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.1044
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    The structure of the 90°-wall in the tetragonal phase of BaTiO3-type ferroelectrics is studied on the basis of the Landau free energy. The wall thickness of the 90°-wall is found to be much thicker than the one for the 180°-wall.
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  • Hydrostatic Pressure Effects on the Excitons and Exciton-Phonon Interaction in BiI3 Crystals
    Hiroki Kurisu, Teruo Komatsu, Tsutomu Karasawa
    1993 Volume 62 Issue 3 Pages 1048-1056
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.1048
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    Optical absorption and photoluminescence due to excitons in BiI3 crystals have been measured under hydrostatic pressures up to 1.5 GPa at 77 K and 300 K. The direct exciton absorption band shows a red shift under pressure with a coefficient of −1.0×102 meV/GPa. The low energy tail of this band obeys the Urbach rule under all pressures. The steepness coefficient σ in the Urbach rule increases from 1.03 to 1.22 as pressure increases from atmospheric pressure to 1 GPa. The intensity of a photoluminescence from a self-trapped exciton state diminishes with increasing pressure, which is complemented by strengthening of the band edge photoluminescence. The behavior of the photoluminescence intensities and the steepness coefficient under pressure is discussed in terms of the instability of the self-trapped exciton state due to the change in the exciton-phonon interaction.
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  • Age-Related Decline of Accommodative Amplitude in Human Emmetropic Eye
    Sigeo Yomosa
    1993 Volume 62 Issue 3 Pages 1057-1075
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.1057
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    From the ageinvariancy of the emmetropic condition, it is shown that the emmetropicity is maintained mainly by the balance between the effect caused by the age-related increases in the curvature of the surfaces of the unaccommodative lens and that caused by the age-related changes in the refractive indices of the lens and the vitreous, and from this, some important expectations on the age-related changes in these refractive indices are derived. From the analysis of age-dependent variation of accommodative amplitude, it is concluded that the age-related decline of accommodative amplitude is brought about mainly by the age-related decreases in the changes in the radii of curvature of the surfaces of the lens during accommodation and subsidiarily by the age-related changes in the refractive indices of the lens and the vitreous. “The lens paradox” is theoretically explained by using our formula on accommodation.
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  • Exact Solutions of Reaction-Diffusion Equation
    E. V. Krishnan
    1993 Volume 62 Issue 3 Pages 1076-1077
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.1076
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  • Excitation Spectrum of Polarization of the Resonant Raman Scattering of F Centers
    Shinji Muramatsu
    1993 Volume 62 Issue 3 Pages 1078-1079
    Published: March 15, 1993
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.1078
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  • Diffuse Scattering of α-AgI with X-Ray CuKα and MoKα Radiations
    Takashi Sakuma
    1993 Volume 62 Issue 3 Pages 1080
    Published: March 15, 1993
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.62.1080
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