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 4
Displaying 1-45 of 45 articles from this issue
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  • A Possible Mechanism by Which the Vorticity Magnitude in Turbulence Distributes Nearly Exponentially
    Iwao Hosokawa
    1989 Volume 58 Issue 4 Pages 1125-1127
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1125
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    It is a well-known but very puzzling fact that the probability density of spatial distribution of the vorticity magnitude in isotropic turbulence is nearly exponential. This fact is explained on the basis of a simple vortex model for 3D homogeneous turbulence.
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  • Relation between Growth Rate of the Suydam Mode and That of Low Mode Number Interchange Instability
    Hideo Sugama, Masahiro Wakatani
    1989 Volume 58 Issue 4 Pages 1128-1130
    Published: April 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1128
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    Pressure-driven interchange instability of any mode number with the same helicity has the same limiting beta value as that by the Suydam criterion in the cylindrical plasma approximation. Growth rate of the Suydam mode gives an upper boundary of that of the low mode number interchange instability. It is possible that conventional numerical calculations using finite mesh sizes give a higher beta limit by the low mode number interchange instability than the Suydam limit because they fail to find sharply localized modes with small growth rates.
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  • The Critical Exponent η of the Three-Dimensional ±J Ising Model by the Transfer Matrix Method
    Hidetsugu Kitatani, Takehiko Oguchi
    1989 Volume 58 Issue 4 Pages 1131-1134
    Published: April 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1131
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    The three-dimensional ±J Ising model on the simple cubic lattice is studied by means of the screw transfer matrix method for L×L×N lattices (L=2∼5; N\simeq103). Studying the decay of the correlation functions, the value of the critical exponent η is found to be −0.26±0.03, assuming Tsg⁄J=1.2. The result is in good agreement with that obtained by the Monte Carlo method and high temperature series expansion method.
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  • Low-Temperature Specific Heats of Betaine Phosphate and Successive Phase Transitions at 82.7 and 87.1 K
    Masaki Maeda, Tooru Atake, Yasutoshi Saito, Hikaru Terauchi
    1989 Volume 58 Issue 4 Pages 1135-1136
    Published: April 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1135
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    Specific heats of betaine phosphate were measured in the temperature region from liquid helium temperature to room temperature. Two specific heat anomalies were found at 82.67 K and 87.11 K due to a new phase transition and the antiferroelectric phase transition, respectively. The sum of the two transition entropies was determined as 0.40 J K−1 mol−1.
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  • Magnetic Susceptibility and Superconductivity in (La1−xSrx)2CuO4
    Migaku Oda, Tatsuya Ohguro, Naofumi Yamada, Masayuki Ido
    1989 Volume 58 Issue 4 Pages 1137-1140
    Published: April 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1137
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    Temperature dependence of magnetic susceptibility χ and resistivity in (La1−xSrx)2CuO4 has been examined in a composition range of x≤0.15. For x\lesssim0.1, χ gradually decreases with lowering temperature, accompanied by a broad peak, while for x>0.1 χ monotonically increases with decreasing temperature. Superconducting transition temperature Tc is observed to be high in samples with x\lesssim0.1, although Tc is depressed with a steplike behavior below x\simeq0.08.
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  • Tunneling Conductance of a Bi2Sr2CaCu2O8-GaAs Junction along the c-Axis
    Nobuaki Miyakawa, Daisuke Shimada, Tadaharu Kido, Nobuo Tsuda
    1989 Volume 58 Issue 4 Pages 1141-1144
    Published: April 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1141
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    Anisotropy in the energy gap of Bi2212 was investigated by using a point contact tunneling junction and it was noted that there was very little anisotropy. When a GaAs needle was contacted perpendicular to the c-plane, at least two kinds of conductance curves were obtained, one with a gap of 42 meV and the other with a gap of 64 meV. In the latter, phonon structures extended to a higher voltage and a three-phonon process was observed similar to our multiphonon exchange model for superconductivity.
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  • Magnetic Symmetry of Yttrium Iron Garnet (YIG) in the Low-Temperature Phase
    Shunsuke Takano, Eiji Kita, Kiiti Siratori, Kay Kohn, Shigeyuki Kimura ...
    1989 Volume 58 Issue 4 Pages 1145-1148
    Published: April 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1145
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    The structural change in YIG at 125 K is revealed by the observation of the first-order magnetoelectric effect. From the detailed experiments at 77 K with different field cooling conditions, it is concluded that the magnetic point symmetry of YIG below 125 K is triclinic-1.
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  • The Exchange Narrowing of T1 in Solid Helium-3: The Fourth Moment of the Resonance Line
    Kazuyuki Matsumoto, Takayuki Abe, Takeo Izuyama
    1989 Volume 58 Issue 4 Pages 1149-1151
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1149
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    The exchange narrowing of the nuclear magnetic relaxation time T1 of bcc 3He is investigated. It is found that multiple exchange models with two and three parameters may explain the T1 data observed in the region 0.2<T<0.8 K for Vm=24.2 cm3/mol. We investigate further the narrowing in hcp 3He. Based on the multiple exchange model with the exchange parameters J1, J1′, J2, and Ksq, we obtain a theoretical expression for T1.
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  • Knot Theory and Conformal Field Theory: Reduction Relations for Braid Generators
    Miki Wadati, Yasuhiko Yamada, Tetsuo Deguchi
    1989 Volume 58 Issue 4 Pages 1153-1161
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1153
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    A formula for eigenvalues of the braid generator is derived from the Knizhnik-Zamolodchikov equation in conformal field theory. Through the formula, reduction relations are calculated. They agree with the results previously obtained in the study of new link polynomials. This establishes an explicit connection between knot theory based on exactly solvable models and conformal field theory.
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  • Interface Approach to Phase Transitions and Ordering by Monte Carlo Simulations and Its Applications to Three-Dimensional Antiferromagnetic Potts Models
    Yohtaro Ueno, Gang Sun, Ikuo Ono
    1989 Volume 58 Issue 4 Pages 1162-1181
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1162
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    We develop an interface approach to bulk phase transitions and ordered states by using Monte Garlo simulations, and apply it to antiferromagnetic q-state Potts models with q=3∼6 on the simple cubic lattice. A stiffness exponent a defined by ΔF∼La, where ΔF is the interface free energy for a system of size L, is introduced as a measure of the stiffness of the ordered phase against an external stress. Applying finite-size scaling to ΔF and to the squared order parameter enable one to determine each of Tc, ν, β and γ in order where Tc is the critical temperature and the others are critical exponents. This approach also provides a means to study properties of the ordered state through a and interface profiles. In the q=3 and 4 models the estimated exponents ν, β, γ and a indicate new universality classes. The q=5 model shows a phase transition, while the q=6 model does not. The q=3∼5 models have non-integer values of a at low temperatures. The phase transitions in these models are confirmed to be due to entropy gains.
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  • A Generalized Evolution Criterion in Nonequilibrium Convective Systems
    Masakazu Ichiyanagi, Kunisuke Nisizima
    1989 Volume 58 Issue 4 Pages 1182-1189
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1182
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    A general evolution criterion, applicable to transport processes such as the conduction of heat and mass diffusion, is obtained as a direct version of the Le Chatelier-Braun principle for stationary states. The present theory is not based on any radical departure from the conventional one. The generalized theory is made determinate by proposing the balance equations for extensive thermodynamic variables which will reflect the character of convective systems under the assumption of local equilibrium. As a consequence of the introduction of source terms in the balance equations, there appear additional terms in the expression of the local entropy production, which are bilinear in terms of the intensive variables and the sources. In the present paper, we show that we can construct a dissipation function for such general cases, in which the premises of the Glansdorff-Prigogine theory are accumulated. The new dissipation function permits us to formulate a generalized evolution criterion for convective systems.
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  • Ferroelectric Domain Pattern Evolution in Quenched Triglycine Sulphate
    Nobuaki Tomita, Hiroshi Orihara, Yoshihiro Ishibashi
    1989 Volume 58 Issue 4 Pages 1190-1198
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1190
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    Time evolution of domain patterns in a quenched ferroelectric triglycine sulphate (TGS) crystal is investigated in real time and in real space. The effect of applying an electric field after quenching is studied. The characteristic length, defined as a mean domain width, is found to obey the power law with respect to time. From the experimentally obtained time dependence of the area fraction of the domains with positive and negative polarization, it is found that this system behaves like one with a conserved order parameter in the studied time scale, though the order parameter in TGS is the polarization. For the system, to which the electric field is applied, it is found that the dynamical scaling law holds for the domain size distribution function.
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  • Two-Time Correlation Functions of a System Coupled to a Heat Bath with a Gaussian-Markoffian Interaction
    Yoshitaka Tanimura, Ryogo Kubo
    1989 Volume 58 Issue 4 Pages 1199-1206
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1199
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    Two-time correlation functions of physical operators of a system interacting with a heat bath producing a Gaussian-Markoffian noise are treated with the use of Feynman-Vernon’s influence functional formalism. The Laplace transforms of correlation functions are shown to be expressed in terms of continued fractions of relevant hyperoperators. The result is valid to all orders of the system-bath interaction. In the limitation of motional narrowing, it reduces to those obtained in conventional methods.
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  • A Temperature Shift Method in Canonical Molecular Dynamics
    Hiromi Otsuka
    1989 Volume 58 Issue 4 Pages 1207-1212
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1207
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    We propose a method for obtaining the average values of physical quantities at temperatures different from the assumed value from a simulation calculation of the constant temperature molecular dynamics (MD) with a fixed temperature. The method is developed on the basis of Nosé’s canonical MD. The present method is numerically tested in a simulation on a 13-atom Lennard-Jones cluster.
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  • High-Resolution Studies of Secondary Emission Spectrum from Resonantly Excited I2 Molecules
    Willem Overlaet, Masahiro Kimura, Shuichi Kinoshita, Takashi Kushida
    1989 Volume 58 Issue 4 Pages 1213-1224
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1213
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    The spectrum of secondarily emitted light from iodine vapor excited by a single-mode Ar+ ion laser has been measured in the forward scattering geometry with a resolution of 80 MHz. The observed spectrum has been found to consist of sharp and broad components. This result is shown to be reproduced fairly well by a Monte Carlo simulation of the molecular collision. The cross sections for the soft and hard velocity-changing collisions of an I2 molecule in the excited state have been obtained as 230 Å2 and 80 Å2, respectively.
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  • Instability of a Hollow Jet with Effects of Surface Tension and Fluid Inertia
    Ahmed E. Radwan
    1989 Volume 58 Issue 4 Pages 1225-1227
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1225
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    Instability of a gas cylinder in a moving infinite liquid under the action of capillary and inertia forces is discussed. The motion of the liquid has always a destabilizing influence, which increases the region of instability. But, the longitudinal wave number for the maximum instability does not change with the liquid velocity.
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  • Electron Transport Analysis in the Presence of Electric and Magnetic Fields by the FTI Method
    Nobuaki Ikuta, Y\={u}hei Sugai
    1989 Volume 58 Issue 4 Pages 1228-1247
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1228
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    Using the newly developed “flight time integral” method, we have carried out a rigorous analysis of the electron transport property in a model gas under the influence of electric and magnetic fields. As is well known, the electron energy distribution is not changed by addition of the magnetic field B in parallel to the electric field E, but is seriously changed when a crossed magnetic field is given above a critical value Bc, where all the electron transport coefficients are diminished with B. It is confirmed that the similarity law holds only when all the values of E, B and gas density N are changed together, keeping E⁄N and B⁄N constant.
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  • Edge Pedestal during the H-Mode of a Tokamak Plasma Measured by the Electron Cyclotron Emission
    Katsumichi Hoshino, Takumi Yamamoto, Hisato Kawashima, Toshihiko Yamau ...
    1989 Volume 58 Issue 4 Pages 1248-1264
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1248
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    The gradient of the edge electron temperature during a tokamak H-mode and parameter dependences of the threshold peripheral electron temperature are measured by the electron cyclotron emission (ECE). A steep gradient characterizes the H-mode and the threshold temperature is dependent on the plasma current. The second H-mode transition is observed, which is characterized by further depression of the intensity of deuterium line, and steeper gradient at the edge. A simple estimation using the measured gradient gives an improvement of the electron heat diffusivity at the pedestal. Some problems are discussed by comparing the measured results with the existing H-mode theories.
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  • Efficient Trap of a Coaxial Gun Plasma in an Axisymmetric Mirror with an Internal Hoop
    Shiro Asano, Makoto Ihara, Masayuki Fukao
    1989 Volume 58 Issue 4 Pages 1265-1272
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1265
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    A method to trap a high temperature and high density plasma from a coaxial gun in a mirror machine is described. The method is to inject plasma parallel to the axis from a coaxial gun located off the axis. The validity of the method is experimentally demonstrated with an MHD-stabilized axisymmetric mirror with an internal hoop. Density, electron and ion temperatures and their time behaviors were measured and it was made clear that a high density high temperature plasma was well trapped in the mirror by the parallel off-axis injection while the plasma was little trapped by on-axis injection. The plasma parameters obtained were also compared with those of a conventional titanium washer gun plasma. The causes to restrict the maximum ion temperature and of its quick decay are discussed.
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  • Reflection of Ion-Acoustic Waves and Solitons
    Tatsuo Watanabe, Yasuo Kanamori, Nobuo Yajima
    1989 Volume 58 Issue 4 Pages 1273-1282
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1273
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    A stationary structure of a sheath around a negatively biased grid inserted in a homogeneous plasma and the associated effects on propagation characteristics of ion-acoustic waves are studied with a theory of collisionless plasma. The reductive perterbation method is applied to obtain the reflection coefficient of ion-acoustic waves from the grid. The results are shown to be in good agreement with the experiments by Nishida and Nagasawa.
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  • Nonprojectiveness of Moiré Fringe Patterns Observed in X-Ray Diffraction
    Junichi Yoshimura
    1989 Volume 58 Issue 4 Pages 1283-1295
    Published: April 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1283
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    Interference fringes in X-ray diffraction must be a projected figure thrown to the wave-traveling direction, due to the property of the wave field that ΔK=const. along the wave path and ΔK⊥\barK(ΔK=K′−K and (Remark: Graphics omitted.)), K and K′ being the wave vectors of interfering waves in vacuum). The second property comes from the condition |K|=|K′|. The question of whether moiré fringes have this projective property was examined experimentally. Moiré fringes were observed from a monolithic Si bicrystal by X-ray topography. Experiments have shown that the directions and positions of moiré fringes vary with the shift of the observation point along the wave path in oscillatory manners, and thus the moiré fringes are not exactly the projected figure. This fact indicates that the first or both of the conditions, ΔK=const. and ΔK⊥\barK, do not apparently hold in the moiré-fringe interference.
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  • Nonlinear Effect on the Axial Next-Nearest Neighbor Ising (ANNNI) Model: Application to CeSb
    Kazuo Nakanishi
    1989 Volume 58 Issue 4 Pages 1296-1306
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1296
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    Mean field calculations are made to study the effect of nonlinear terms with respect to the magnetization in the axial next-nearest neighbor Ising (ANNNI) model. The phase diagrams are calculated in both zero and nonzero magnetic fields, in which a large number of high-order commensurate phases is found. It is shown that the nonlinear effect makes the ordered phase stable at higher temperatures and larger fields. Partially disordered states which contain paramagnetic sites are also obtained, resulting from the nonlinear effect as well as the competition between the intralayer coupling and the entropy effect. In this connection, the theory is compared with the complex magnetic phase diagram of CeSb.
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  • Principle of Corresponding State for Fluid Metals
    Ryuzo Abe
    1989 Volume 58 Issue 4 Pages 1307-1311
    Published: April 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1307
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    By extension of a previous treatment, the principle of corresponding state for fluid metals is derived. The ion is regarded as a hard sphere with a core radius b. Dimensional analysis of the Schrödinger equation for an electron system leads to the result that four independent parameters appear to characterize the thermodynamic properties of the system. By a choice of suitable parameters, some relations between critical quantities are studied for a series of alkali metals. Also, a possible dependence of the critical compressibility factor and of the reduced equation of state on Z (valence of ion) is discussed.
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  • The Superfluid Transition of 4He Adsorbed in Zeolite —A Theoretical Study Based on the Quantum Lattice Gas Model—
    Ippei Doi
    1989 Volume 58 Issue 4 Pages 1312-1319
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1312
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    Based on the quantum lattice gas model, the superfluid transition temperature Tc is calculated for 4He atoms in the model substrate of zeolite. When the density in void cages and that in pores is different, Tc is strongly reduced compared with the case that the density is homogeneous. In particular, if a pore is longer than a certain length, the superfluidity completely disappears under any density. This makes a contrast with the case of the homogeneous density where Tc remains finite for each pore length. We also give a general discussion on the competition between the superfluid transition and the solid-liquid (or liquid-gas) transition of bose particles in zeolite.
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  • Electrical and Optical Properties of Poly(3,4-dialkylthiophene)
    Katsumi Yoshino, Yasuhisa Manda, Keiji Sawada, Shigenori Morita, Hiroy ...
    1989 Volume 58 Issue 4 Pages 1320-1324
    Published: April 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1320
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    Poly(3,4-dialkylthiophene) films prepared by both electrochemical and chemical methods utilizing FeCl3 as catalyst exhibit much larger band gap compared with non-substituted and 3-substituted polythiophene films. Poly(3,4-dialkylthiophene)s with long alkyl chains are soluble in several solvent. However, thermochromism has not been found contrary to poly(3-alkylthiophene), which are explained in terms of large torsion angle between neighbouring thiophene rings due to the steric hindrance by bulky alkyl group. Poly(3,4-dimethylthiophene) with large band gap also demonstrates drastic spectral, electron spin resonance (ESR) and conductivity changes upon doping due to an insulator-metal transition.
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  • Effect of Intersubband Impurity Scattering on the Anderson Localization in Two Dimensional Electron Systems
    Shuichi Iwabuchi, Yosuke Nagaoka
    1989 Volume 58 Issue 4 Pages 1325-1333
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1325
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    Effect of intersubband impurity scattering on the Anderson localization is studied in the weakly localized regime of two dimensional electron systems. It is shown that it changes not only the prefactor of the quantum correction of conductivity, but also the diffusion constant, depending on the ratio of the intersubband scattering time to the inelastic scattering time. The crossover behavior in magnetoconductivity from one-subband occupation to two-subband occupation is also studied. Since it varies depending on various scattering times, details of scattering processes can be determined for an arbitrary electron density by fitting experimental observations to theoretical expressions. Experimental determination of the inelastic scattering time without considering this effect leads to an incorrect estimation.
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  • Shell Structure of Electronic State of Icosahedral Al and Cu Clusters
    Nobuhisa Fujima, Tsuyoshi Yamaguchi
    1989 Volume 58 Issue 4 Pages 1334-1346
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1334
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    Electronic states of icosahedral (Ih) clusters Al13, Al12, Cu13 and Cu12 were calculated by the DV–Xα method which took into account of many-electron effects. The valence 3d orbitals of Ih–Cu13 cluster are localized within atom and isolated from the valence 4s and 4p orbitals extended over the whole cluster. The characteristic feature of the states of s and p valence electrons of Ih–Al13 and Cu13 clusters well corresponds to that of one-electron picture i.e. the shell model of the 3-dimensional isotropic harmonic oscillator potential. Electronic states of valence levels of Ih–Al12 and Ih–Cu12 clusters which have no central atom fairly well correspond to those of a combined potential of the harmonic oscillator and a 3-dimensional Gaussian potential barrier at the center of the cluster.
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  • Pairing of Fermions Coupled with Spin-1/2 Heisenberg System —Exact Diagonalization Study for Mechanism of High-Tc Superconductivity—
    Yasuhiro Hatsugai, Masatoshi Imada, Naoto Nagaosa
    1989 Volume 58 Issue 4 Pages 1347-1371
    Published: April 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1347
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    A coupled spin-fermion system is investigated as a model of high-Tc superconductivity. By the exact diagonalization technique, the binding energy of two fermions and several correlation functions in the ground state are calculated to study possible pairings of holes in orbitals of pπ, pσ, d3z2−r2 etc. The bound states of fermions are suggested in two regions in the parameter space. In the small transfer region, it is caused by local defects induced in the antiferromagnet at the fermion sites. The larger transfer region is characterized by the relatively extended disturbance of the antiferromagnetic correlation of the substrate spins, where the fermion forms singlet-like cloud around it. The latter is a characteristic feature of the antiferromagnetic fermion-spin coupling. The relevance of the latter region to high-Tc superconductivity is discussed. The possibilities of bound states of fermions in Kondo lattices are also investigated.
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  • On Mechanism of “the Giant Resistivity Anomaly” Appearing in the Superconducting Transition Region of TaSe3
    Mitsuru Morita, Kazuhiko Yamaya
    1989 Volume 58 Issue 4 Pages 1372-1376
    Published: April 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1372
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    To make clear the mechanism of “the giant resistivity anomaly” appearing in the superconducting transition region of TaSe3, the experimental conditions are re-examined. It was found that the anomaly is not intrinsic but is induced by a coupling between the non-linear current-voltage characteristics of TaSe3 and the high-frequency noise generated by instruments. From the measurement of the superconducting critical current, it was concluded that the superconductivity of TaSe3 is not of bulk nature but filamentary.
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  • Renormalized Fluctuation Theory of Resistive Transition in High-Temperature Superconductors under Magnetic Field
    Ryusuke Ikeda, Tetsuo Ohmi, Toshihiko Tsuneto
    1989 Volume 58 Issue 4 Pages 1377-1386
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1377
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    We attempt to explain the broad resistive transition observed in high-temperature superconductors under an applied magnetic field by a renormalized theory of the order parameter fluctuations using a model of superconductors with layered structures. The results are compared with single-crystal resistivity data. They are in good agreement, at least in the higher temperature side of the resistive transition, where the theory is expected to be valid.
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  • Theory of the Spin-Wave Mediated High-Tc Superconductivity
    Kazuo Hida
    1989 Volume 58 Issue 4 Pages 1387-1393
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1387
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    A model of the high-Tc oxide superconductor based on the antiferromagnetic spin wave exchange is investigated. It is assumed that the holes, which are the superconductive carriers, are mainly doped into the pπ orbital of the O atoms on the CuO plane. Cu spins are assumed to be localized and to be in the almost antiferromagnetic state. In this case, the O holes can form Copper pairs exchanging the spin wave of the Cu spin system. The transition temperature is calculated taking into account the lifetime of the spin wave and the retardation effect. The carrier density dependence of the transition temperature is discussed. The structure of the energy gap and the real space pair-wave function is presented. The Cooper pair is shown to have d-like symmetry.
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  • Superconductivity with On- and Inter-Site Attractions in a Two-Dimensional Square Lattice
    Hiroyuki Mori
    1989 Volume 58 Issue 4 Pages 1394-1402
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1394
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    We investigate superconductivity in a two-dimensional square lattice characterized by both an on-site attractive interaction (−V1) of the BCS type and an inter-site attractive interaction (−V2). We evaluate the phase diagram in the (V1, V2, T) space, which shows that there appear three kinds of superconducting states, i.e. a pure s-state, a pure d-state and a mixed state, depending on the values of V1, V2, and T. For some appropriate values of V1 and V2, two types of transitions take place on the reduction of temperature; from a normal state to a pure state and then from a pure state to a mixed state. We calculate several physical quantities in order to study their behaviors at these transition points. Implication of the present theory is discussed in relation with high-Tc superconductivity.
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  • Theory of the Resonating Valence Bond in Quantum Spin System
    Takehiko Oguchi, Hidetsugu Kitatani
    1989 Volume 58 Issue 4 Pages 1403-1415
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1403
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    The theory of the resonating valence bond (RVB) for the antiferromagnetic Heisenberg model of spin 1/2 proposed by Anderson is generalized by taking account of singlet bonds connecting distant spins, and is solved exactly for the finite lattice. It is shown that the RVB wave function is Stot (total spin quantum number)=0, and that replacing a part of singlet bonds by triplet bonds, eigenfunctions with Stot=1, 2, … can be constructed. These are the new representation of eigenfunctions of the Heisenberg Hamiltonian.
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  • Reentrant Spin-Glass Transition and a Mixed Phase in an Ising System FexMn1−xTiO3
    Hideki Yoshizawa, Setsuo Mitsuda, Hiroko Aruga, Atsuko Ito
    1989 Volume 58 Issue 4 Pages 1416-1426
    Published: April 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1416
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    Neutron scattering demonstrates the clear reentrant spin-glass (SG) transition, for the first time, in the Ising system FexMn1−xTiO3 for x=0.33, 0.38, 0.60, and 0.65. The samples with x=0.41, 0.50 and 0.55 exhibit paramagnetic to SG behavior upon lowering the temperature. The results confirm the SG and reentrant SG transitions which were suggested from the previous bulk susceptibility measurements by Ito et al. The reentrant SG phase is shown to be actually a mixed phase where the antiferromagnetic long range order coexists with the SG ordering. The behavior of the diffuse intensity as well as the inverse correlation length κ as a function of an Fe ion concentration x strongly suggests that there exists a phase boundary between the mixed phase and the pure SG phase. Thus the phase below the AT line in an Ising SG system should be strictly distinguished from the pure SG phase. By comparing the data of the x=0.58 sample to that of the x=0.57 sample, this phase boundary is parallel to the temperature axis within the accuracy of 0.5% of the Fe concentration. The topology of the Ising SG phase diagram is briefly discussed by contrast to that of the Sherrington-Kirkpatrick model.
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  • Magnetization Curve for Ce Compounds in the Crystalline Field
    Norio Kawakami, Tatsuya Usuki, Ayao Okiji
    1989 Volume 58 Issue 4 Pages 1427-1432
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1427
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    The magnetization curve for the Ce Kondo system is investigated with the use of the exact solution of the Coqblin-Schrieffer model at zero temperature. Characteristic properties caused by the crystal-field effects are discussed with a simple level scheme for the hexagonal field. The obtained results are quantitatively compared with experimental findings for the heavy electron compounds CeAl3 and CeCu2Si2 with rather good agreement.
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  • Mössbauer Study on the Magnetic Structure of YbFe2O4: A Two-Dimensional Antiferromagnet on a Triangular Lattice
    Midori Tanaka, Hiroko Iwasaki, Kiiti Siratori, Isamu Shindo
    1989 Volume 58 Issue 4 Pages 1433-1440
    Published: April 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1433
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    Mössbauer spectra of 57Fe in a single-crystal YbFe2O4, an antiferromagnetic Ising spin system on a triangular lattice, were measured below the Neel temperature, TN. Outermost groups of absorption spectra, those due to Fe ions in a 3+-like state, were investigated extensively as a function of the external magnetic field during measurement (Hmeas) as well as that during cooling (Hcool) of the specimen through TN. It is concluded that there are three kinds of Fe[3+] ions of equal number, the spins of two of which are parallel to each other and antiparallel to the other. The effective field at the nuclei of the majority Fe[3+] spin is increased by Hmeas. Formation of short-range ordering of Fe ions with different valences is suggested, though the details are not clear at present.
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  • A New Luminescence under High-Density Excitation in PbI2 Possibly Due to a Self-Trapped Excitonic Molecule
    Jun Takeda, Takenari Goto, Makoto Tomita, Masahiro Matsuoka
    1989 Volume 58 Issue 4 Pages 1441-1445
    Published: April 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1441
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    A new luminescence band has been found in the temperature range from 40 to 80 K under high-density excitation of 2H-PbI2. The decay time of this luminescence at 58 K is about 400 ps, which is twice as large as that due to the excitonic molecule, and both the Stokes shift and the half-width are about 0.01 eV. These experimental facts suggest that the new luminescence comes from radiative annihilation of the self-trapped excitonic molecule leaving the exciton in the distorted lattice.
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  • Optical Absorption of Two Spheres
    Raphael Ruppin
    1989 Volume 58 Issue 4 Pages 1446-1451
    Published: April 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1446
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    The absorption cross section of a system of two spheres is derived by an analytic method based on the separability of the Laplace equation in bispherical coordinates. The method is applicable in the non-retarded limit, i.e., for sphere radius small in comparison with the wavelength of the impinging electromagnetic radiation. The evolvement of the absorption spectrum with decreasing distance between the spheres is demonstrated by numerical calculations. The implications on the interpretation of experimental infrared absorption spectra of small crystallites are discussed.
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  • Effect of Valence Mixing on Multiplet Structures in the 4d Core Photoabsorption Spectra for Ce Compounds
    Takeo Jo
    1989 Volume 58 Issue 4 Pages 1452-1463
    Published: April 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1452
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    The effect of valence mixing on multiplet structures in the Ce 4d X-ray absorption spectra for metallic Ce compounds such as CeRh3 and insulators CeO2 and CeF4 is discussed on the basis of the impurity Anderson model combined with the electron-electron (or hole) interactions described by the Slater integrals and the spin-orbit interactions. A similarity in the spectrum for a prethreshold region between metallic mixed valent compounds such as CeRh3 with the number of 4f electrons nf∼0.8 and trivalent compounds (nf∼1) and a dissimilarity between CeRh3 and the insulators CeO2 (nf∼0.5) and CeF4 (nf∼0.3) are explained consistently with an interpretation for their 3d core level spectra. The deviation from the multiplet structure typical of integral valence system is shown to be caused by a strong interference between the 4d104f0→4d94f1 and 4d104f1v→4d94f2v photoexcitations which is derived from the hybridization between the 4f and conduction (or valence) band states.
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  • Exciton Relaxation Processes into the UV-States in CdI2:Br Mixed Crystals
    Yoshinori Hayashi, Hideyuki Nakagawa, Hiroaki Matsumoto
    1989 Volume 58 Issue 4 Pages 1464-1473
    Published: April 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1464
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    Emission intensities, lifetimes and their temperature dependence of the UV-emission in the CdI2:Br mixed crystals were investigated from 1.7 to 50 K by varying the Br− concentration and the excitation energy. The UV-emission is observed in the region between 3.30 and 3.45 eV and diminishes as increasing the concentration of CdBr2. The UV-emission decays with three exponential components: τS=83 μs, τM=24 μs and τF=2.3 μs at 1.7 K. It has been proved that the initial state of the τS-component and that of the τM- and τF-components are quite distinct from each other. In order to explain the present experimental results three exciton relaxation processes into the UV-states are proposed, that is, the tunneling and the thermal activation processes from the bottom of the indirect free exciton band and the direct process from the upper states of excitons.
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  • Hysteresis and Relaxation Phenomena near a Bifurcation Point of the Oscillation Mode of the Forced Oregonator
    Yoshitaka Yamamoto, Takahiro Yamaguchi, Kuninosuke Imaeda
    1989 Volume 58 Issue 4 Pages 1474-1481
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1474
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    Responding to an external periodic force, the oscillation mode of the Oregonator shows a hysteresis phenomenon and a relaxation phenomenon according as the final value of the amplitude is inside or outside of the bistable region where the amplitude of the external periodic force is varied with time while the frequency is kept constant. In the outside of the bistable region and in the vicinity of the transition points, we observed relaxation phenomena and obtained the critical exponent in the relation between the relaxation time and the difference of the control parameter from the critical point.
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  • X-Ray Diffraction Analysis of Icosahedral Phase under High Pressures
    Yoshihisa Mori, Yuichi Akahama, Mototada Kobayashi, Haruki Kawamura, K ...
    1989 Volume 58 Issue 4 Pages 1482-1483
    Published: April 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1482
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  • Magnetic Susceptibilities of Liquid Cd–Na and In–Na Alloys
    Shin’ichi Takeda, Shigeru Tamaki
    1989 Volume 58 Issue 4 Pages 1484-1485
    Published: April 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1484
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  • The Optical Spectra of α-Al2O3 Single Crystals in the Vacuum Ultraviolet Region
    Tetsuhiko Tomiki, Tomoyoshi Futemma, Hiroo Kato, Tsuneaki Miyahara, Yo ...
    1989 Volume 58 Issue 4 Pages 1486-1487
    Published: April 15, 1989
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1486
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  • “Optical Constants and Excitons of Alkali Cuprous Halide Crystals” and “Optical Constants and Excitons of Alkali Silver Halide Crystals”
    Keiichi Edamatsu, Takao Nanba, Mikihiko Ikezawa
    1989 Volume 58 Issue 4 Pages 1488
    Published: April 15, 1989
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.58.1488
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