Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
Volume 55, Issue 12
Displaying 1-50 of 58 articles from this issue
  • Norikatsu Mio, Hiromasa Hirakawa
    1986 Volume 55 Issue 12 Pages 4143-4146
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Development of the dynamic gravitational field experiment provides us with the precise test for the inverse-square law of gravitation because this method is free from effects of the background mass distribution. However, since the previous experiments were performed by direct measurement of the force between masses, requirements for the detecting system were severer than those of null measurement. We show here the feasibility of the null experiment with advantages attendant on the dynamic method.
    Download PDF (424K)
  • Hidezumi Terazawa
    1986 Volume 55 Issue 12 Pages 4147-4148
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    A specific picture in a minimal composite model for the generation of quarks in which quarks are two- and four-body composites in the first and second generation leads to the mass relation of mcms=(4mdmu)⁄(4mumd), which may explain the largeness of mcms.
    Download PDF (260K)
  • Hidezumi Terazawa
    1986 Volume 55 Issue 12 Pages 4149-4151
    Published: December 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    It is pointed out that the masses of quarks and leptons in the first generation may satisfy the square-root sum rule of me1⁄2mνe1⁄2=md1⁄2mu1⁄2, which suggests the quadratic form of Hamiltonian in “hypercharges” and the additivity of “hypercharges” in a minimal composite model of quarks and leptons.
    Download PDF (376K)
  • Yasuhide Fukumoto, Takeshi Miyazaki
    1986 Volume 55 Issue 12 Pages 4152-4155
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The motion of a thin vortex filament in an incompressible inviscid fluid is investigated theoretically, based on the localized induction equation. The N-soliton solution is given explicitly, using the bilinear equations obtained by Hirota. A detailed examination of the solution shows that two solitons with large lateral excursion suffer backward phase-shifts during a head-on collision. The present solution also generates the N-soliton solution of the classical 1-dim. continuous Heisenberg ferromagnet equation.
    Download PDF (412K)
  • Akio Matsuoka, Koichi Sato, Hideki Arimoto, Shuichi Yamada, Akiyoshi N ...
    1986 Volume 55 Issue 12 Pages 4156-4159
    Published: December 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Time behavior of the plasma in the limiter shadow (peripheral plasma) has been studied in the STP-3M Reversed-Field Pinch experiment using Langmuir probes installed behind the limiters. Before setting up the RFP configuration, the peripheral density decreases rapidly after the initial ionization of the working gas. In the current rise phase, a large scale disturbance of peripheral density propagates with the asymmetrically generated toroidal flux in the direction of electron diamagnetic drift. In the quiescent phase, a pulsive increase of the peripheral density is accompanied with the flux enhancement. A possible mechanism of the increase of peripheral density is discussed.
    Download PDF (536K)
  • Haruo Honjo, Mitsuhiro Nambu
    1986 Volume 55 Issue 12 Pages 4160-4163
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    A model of forced plasma-maser effects is examined numerically. The model represents a conservative system and reduces to the forced type of the original Lotka-Volterra equation. A stochastic motion is found to occur when the density of a cold ion beam becomes larger.
    Download PDF (548K)
  • Yoshiyuki Ono
    1986 Volume 55 Issue 12 Pages 4164-4167
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Fractionally charged states in nearly 1/3-filled 1D electron-phonon systems are numerically investigated by using a Fröhlich-type model in the site representation. Especially a proper choice of the coupling constant is found to yield a soliton solution with the excess electron number 2/3 where the order parameter shows a locus of an almost straight line on a complex plane. This result is in accordance with the recent analytic calculation by Iwano and Wada.
    Download PDF (432K)
  • Michinobu Mino, Hitoshi Yamazaki
    1986 Volume 55 Issue 12 Pages 4168-4171
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Parallel pumping experiments in YIG magnons have been performed at 4.2 K. Above the spin-wave instability threshold, chaotic auto-oscillations are observed. From time-series data, return maps, fractal dimensions, positive Lyapunov exponents, phase space portraits of strange attractors and two-dimensional Poincare sections are obtained. The largest Lyapunov exponent, which describes the degree of chaos, is obtained as 0.34. The Poincare sections of the phase space trajectories exhibit the stretching and holding which are characteristics of strange attractors.
    Download PDF (448K)
  • Yasuji Kashiwase, Masahiro Mori, Motokazu Kogiso, Masayuki Minoura, Sa ...
    1986 Volume 55 Issue 12 Pages 4172-4174
    Published: December 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    An excess line was observed across the 220 thermal diffuse spot on diffraction photographs of a germanium crystal in the Laue arrangement by using monochromatized synchrotron radiation of wavelength 1.5405 Å. The excess line is explained to be caused by anomalous transmission of thermally scattered X-rays in the absorbing perfect crystal.
    Download PDF (384K)
  • Shigeji Fujita, Lan Nguyen
    1986 Volume 55 Issue 12 Pages 4175-4179
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The viscosity of a liquid generally decreases exponentially with the rise in temperature. A simple-kinetic theory of this behavior is given in terms of the momentum transfer by vacancies. The present theory is mainly developed for a simple liquid but the main ideas should be applicable to a general liquid.
    Download PDF (660K)
  • Masumi Hattori
    1986 Volume 55 Issue 12 Pages 4180-4185
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The equation of motion for a dipolar Ising Model at a marginal dimension d=3 is studied on the basis of the renormalized field theory. It is shown that the temperature dependence of a nonlinear relaxation time t(nl) is related to a linear one t(l) as t(nl)=t(l)Ms+, where Ms+ is defined as the spontaneous magnetization at the temperature Tc−|τ| irrespective of the sign of the renormalized temperature difference τ=TTc.
    Download PDF (436K)
  • Hatsuo Kimura, Huzio Nakano
    1986 Volume 55 Issue 12 Pages 4186-4193
    Published: December 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    The surface tension of the nematic-isotropic (N-I) interface is calculated in a mean field approximation for the system of rod-like molecules interacting via attraction as well as hard-core repulsion. It is found that the excluded volume effect favors the planar orientation of molecules at the N-I interface in contrast with the case of the nematic free surface at which the effect favors the normal alignment. Experimental behavior of nematogens such as 4-n-pentyl-4′-cyanobiphenyl (5CB) and 4-methoxybenzylidene-4′-butylaniline (MBBA) are analysed. Orientations of a molecule at the N-I interface and at the nematic free surface are explained consistently as effects of a counterbalance between the repulsive and attractive intermolecular forces.
    Download PDF (900K)
  • Takao Yamamoto, Takeo Izuyama
    1986 Volume 55 Issue 12 Pages 4194-4204
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    In our previous paper it was shown that the atoms adsorbed on an anisotropic rectangular substrate lattice may exhibit a unique incommensurate phase of new kind. Physical interpretation of this new phase, called the IC2 phase, is given in this paper. This phase is found to be the first example of “antiferromagnetic” short range order caused solely by entropy requirements. Such order can be seen only on an imaginary lattice but can not be detected on the real lattice. We show, however, that the new phase exhibits a distinct feature in the X ray and neutron scatterings. To show this we calculate the structure factor of the incommensurate phases on the basis of the Fermion approach developed in our previous papers.
    Download PDF (1060K)
  • Masuo Suzuki
    1986 Volume 55 Issue 12 Pages 4205-4230
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    A general method is proposed to study non-classical scaling behaviors of cooperative systems. This is based on the appearance of a “coherent anomaly” in mean-field-type or classical approximations of cooperative systems. The degree of approximation is analytically continued to construct a parameterized expression of a whole set of approximations, using Kubo’s linear response theory. General relations between scaling (or critical) exponents and “coherent-anomaly exponents” are derived using the theory of envelope and are also obtained from a finite-degree-of-approximation scaling, which is inspired by Fisher’s finite-size scaling. The present coherent-anomaly method (CAM) is promising for calculating analytically non-classical scaling exponents in cooperative phenomena. A general scheme of CAM in critical phenomena is presented. It is shown that even the combination of the Weiss and Bethe approximations gives rather good estimates of static and dynamic critical exponents.
    Download PDF (2992K)
  • Kenji Tobita, Hiroshi Takeuchi
    1986 Volume 55 Issue 12 Pages 4231-4233
    Published: December 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Measurements of one-electron loss cross section for ground state helium atom in hydrogen gas were made in the energy range of 2–15 keV. The cross section was determined by the initial growth method. In order to detect helium atoms and ions, micro-channel plate detectors were used. The obtained values are consistent with the published data in the energy range of 10–15 keV.
    Download PDF (340K)
  • Osamu Sano
    1986 Volume 55 Issue 12 Pages 4234-4240
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Theoretical study is made on the two-dimensional steady thermal convection in a viscous fluid confined between two horizontal concentric cylinders. Temperature on the cylinder walls is distributed so that it varies linearly in the direction of gravity. The Boussinesq approximation is adopted, and first order perturbed fields from steady heat conduction state are examined. Four types of thermal convections with cellular structure are found, and dependences of critical Rayleigh numbers on the thickness of annular region are given for these types. Typical flow and temperature fields corresponding to these critical modes are shown.
    Download PDF (608K)
  • Nobuo Mizuno, Masatomo Sato
    1986 Volume 55 Issue 12 Pages 4241-4252
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Quasilinear development of Alfvén loss-cone instability by thermonuclear α-particles in a magnetic mirror system is investigated. The Alfvén wave is excited by anisotropy in the α-particle velocity distribution due to loss-cones, and α-particles are scattered by the excited waves. After considerations on the dispersion relation and resonance condition for Alfvén and magneto-acoustic waves, the system of quasilinear equations for the Alfvén loss-cone instability is solved analytically in the steady state and numerically to obtain a time-dependent solution. It is assumed that some fraction of the wave energy is reflected at the edge of the machine. The distribution function, density and loss fraction of α-particles and the wave energy density are obtained and analysed. The results show that the α-particle loss by the quasilinear diffusion can be very large compared to the one by collisional diffusion.
    Download PDF (1228K)
  • Tosiya Taniuti
    1986 Volume 55 Issue 12 Pages 4253-4258
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    A model equation to study nonlinear behaviours of a collisional drift-wave localized about a mode-rational surface in a slab model is derived on the basis of the magnetohydrodynamics for a low-β plasma of cold ions and isothermal electrons. The equation comprises the usual linear and nonlinear terms due to the density-gradient drift and the polarization drift and a linear term responsible for effects of finite electrical resistivity incorporated with effects of magnetic shear.
    Download PDF (628K)
  • Akira Ando, Kazuo Ogura, Hitoshi Tanaka, Motomi Iida, Shunsuke Ide, Ke ...
    1986 Volume 55 Issue 12 Pages 4259-4271
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    By injecting RF power in the electron cyclotron(EC) range of frequency, the plasma current is sustained and ramped up after OH power is shut off. Here EC driven current is generated by EC heating of suprathermal electrons in the OH plasma. The plasma current is also generated in the RF discharge plasma at EC resonance (ECR plasma) in WT-2. Both in OH-produced and ECR-produced plasmas, the electron velocity distribution function is asymmetric with respect to the magnetic field. This asymmetry leads to an asymmetric EC heating generating the toroidal plasma current. The efficiency of EC current drive is obtained as η∼1×10−4(1020 m−2kA/kW), which is small in comparison with the theoretical prediction.
    Download PDF (1684K)
  • Akira Sugiyama
    1986 Volume 55 Issue 12 Pages 4272-4282
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    A method for rapid convergence of lattice sums is applied to calculate the structural part, EVS, of the formation energy of a vacancy in metals by using Faber’s formula. Pair potentials discussed here are those derived from parameterized pseudopotentials screened by various dielectric functions. The method proves useful for this calculation; an error due to convergence is reduced so that numerical differentiation in Faber’s formula is performed accurately. Present result of the calculation for EVS is compared with results by Minchin et al., Popovic et al., and Ho. The comparison shows that errors in the calculations of EVS by these authors often exceed relaxation energies. The present method shows that EVS depends largely on the lattice size and on the form of the pseudopotential. Thus the calculation of EVS gives a method for reasonable choice of the potential form.
    Download PDF (1288K)
  • Shin’ichi Takeda, Shigeru Tamaki, Yoshio Waseda
    1986 Volume 55 Issue 12 Pages 4283-4295
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The neutron diffraction study of liquid Se–Te system has been carried out to reveal the origin of characteristic temperature dependence of various properties related to the structural order in atomic scale. The temperature dependence of measured structural functions of liquid SexTe1−x system could be explained by a gradual transition from two-fold coordinated component (non-metallic) to the three-fold coordinated one (metallic). The partial structure factors of these two-fold and three-fold coordinations are separated with the help of the thermodynamic data. A configurational model satisfying these situations is also presented.
    Download PDF (932K)
  • Shigeru Tamaki, Shin’ichi Takeda, Sh\={u}zi Harada, Yoshio Wased ...
    1986 Volume 55 Issue 12 Pages 4296-4301
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Neutron diffraction experiments have been applied for liquid Bi–Zn alloys. The structure factors of this system along the liquidus curve have been obtained and its temperature dependence above the critical temperature, where the miscibility gap closes, is also examined. A remarkable change in the structure factor has been observed around 80 at% Zn, which composition corresponds to that of maximum critical temperature. This concentration variation of the observed structure factors has been discussed in view point of the thermodynamic properties.
    Download PDF (528K)
  • Kêitsiro Aizu
    1986 Volume 55 Issue 12 Pages 4302-4308
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Certain different types of twofold incommensurate phases are possible (an account of which was given recently). Their meanings are set forth again. It is manifested that some of them are ferroelectric or, in other words, a homogeneous or nonwavy polarization component is condensed in some of them. The direction of ferroelectricity is the same as in the corresponding commensurate ferroic phase. The faintness index of ferroelectric transition differs with different types of incommensurate phases (including the semicommensurate type). Nonferroelectric types of incommensurate phases (including the onefold incommensurate type) can be dielectrically distinguished from each other by taking polarization-wave condensation into consideration.
    Download PDF (736K)
  • Yoshihiro Ishibashi
    1986 Volume 55 Issue 12 Pages 4309-4314
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    A two-sublattice model is presented for reproducing the normal(N)-commensurate(C)-incommensurate(IC)-commensurate(C) phase sequence phenomenologically. The temperature dependences of the transition parameters representing the homogeneous ionic displacements and the incommensurate modulated structure are obtained. The temperature dependences of a lattice constant and the soft mode frequencies are also presented.
    Download PDF (492K)
  • Yasusada Yamada, Mitsuo Harada
    1986 Volume 55 Issue 12 Pages 4315-4322
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    A simple theory has been developed to explain various interesting aspects of successive phase transitions in K2Ba(NO2)4. K2Ba(NO2)4 crystal undergoes two phase transitions successively associated with orientational ordering of NO2 ionic groups. The first transition is characterized by the transition from disordered phase to a POD (partially ordered) phase, while the second transition is characterized by two-dimensional ordering in one of the sublattices. It has been shown that the successive transition scheme in K2Ba(NO2)4 can be satisfactorily explained within the framework of non-collinear Ising spin system with interactions up to third nearest neighbours. The most interesting features of the transitions; partial ordering at the first transition and low dimensionality of the second transition are both understood as due to ‘dipolar frustration’ occuring in an Ising system arranged on a Kagome lattice.
    Download PDF (816K)
  • Yasushi Ohfuti, Yoshiyuki Ono
    1986 Volume 55 Issue 12 Pages 4323-4340
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Various fractionally charged states in nearly quarter-filled one-dimensional electron-phonon systems are numerically investigated for Su-Schrieffer-Heeger’s model. Three types of solitons are obtained depending on the excess electron number δn=NeN⁄2 and spin s with N and Ne the total numbers of lattice sites and electrons; they may be called phase solitons, charged amplitude solitons and a neutral amplitude soliton for (δn, s)=(±1⁄2, 0), (±1⁄2, 1⁄2) and (0, 1⁄2), respectively. The states for the other δn’s are found to consist of proper combinations of the above solitons well separated from one another. Electronic levels corresponding to localized states associated with the solitons exist not only within the gap between the conduction and valence bands but also below the valence band. Creation energies and widths of the solitons are calculated for various coupling constants.
    Download PDF (1664K)
  • Mineo Saito, Atsushi Oshiyama
    1986 Volume 55 Issue 12 Pages 4341-4348
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Mechanisms of charge transfer along c-axis in first stage alkali-metal graphite intercalation compounds are studied by the self-consistent numerical-basis-set LCAO band-structure calculations within the local density functional scheme. An augmented LCAO basis set consisting of localized orbitals located at the interstitial sites between graphite layers in addition to the optimized atomic orbitals situated at the atomic sites, successfully describes interlayer states of pristine graphite. Moreover, in the cases of C8K, C8Rb and C8Cs, it is found that both the s-states originating from alkali-atoms and the interlayer states are located above the Fermi level. However, Mulliken charge population analysis for C8Cs indicates that a small amount of charge remains in 6s-orbital of Cs due to the hybridization between the 6s-orbital and the occupied graphite bands.
    Download PDF (888K)
  • Kenzo Naito, Yoshichika \={O}nuki, Takemi Komatsubara, Tsuneaki Miyaha ...
    1986 Volume 55 Issue 12 Pages 4349-4358
    Published: December 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    The energy states of 4f electrons in CexLa1−xCu6 (x=0, 0.2, 0.5, 0.8, 1) have been studied by means of resonant photoemission. At any concentration of cerium ions, the energy distribution of 4f partial density of states shows a leading peak with a skew Lorentzian shape and weak features on both sides of the peak. As the concentration of cerium ions increases, the width of the leading peak increases and its position moves toward the low binding energy, and the 4f partial density of states per cerium atom near the Fermi edge increases. Fine structures near the 4d threshold in photoyield spectra have also been observed. The shape of the 3D1 line of the lanthanum ion varies with the concentration of lanthanum ions. The origin of the observed dependence of energy distribution curves and photoyield spectra on the concentration of cerium ions is discussed.
    Download PDF (1340K)
  • Yoshikazu Suzumura, Tetsuro Saso
    1986 Volume 55 Issue 12 Pages 4359-4366
    Published: December 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Competition between the impurity pinning and the commensurability pinning is investigated by studying the one-dimensional charge density wave (CDW) systems under the external sinusoidal potential, −B cos θ, where θ is the phase of CDW. The pinning of θ is examined by both numerical and analytical methods which turn out to yield the consistent results. It is shown that both types of pinning coexist for all values of B and that the state pinned by impurities undergoes gradual change into the state pinned by the commensurability potential as B increases.
    Download PDF (764K)
  • Isao Sakamoto, Masaki Sugiyama, Yuuichi Takahashi, Takao Sato
    1986 Volume 55 Issue 12 Pages 4367-4369
    Published: December 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    We have measured the Hall resistivity ρH of CuFe alloys with concentrations c from 0.1 to 1.5 at% Fe at 4.2 K in magnetic fields H up to 10 kOe. For c<0.5 at% Fe ρH exhibits an ordinary Hall effect only, while for c≥0.7 at% Fe an anomalous Hall effect is observed. We attribute the origin of the anomalous Hall effect to the presence of clusters of Fe atoms.
    Download PDF (328K)
  • Akiko Natori
    1986 Volume 55 Issue 12 Pages 4370-4381
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The phonon limited resistivities ρa and ρc in directions of a- and c-axes have been calculated with use of the variational formula. In high temperatures, both the inelastic and inter-band scatterings become dominant, in addition to the usual acoustic phonon scattering. The phonon mode is approximated as a layered mode localized on a layer. Both ρa and ρc increase with the increase of temperature, but the ratio of resistivity, ρc⁄ρa, decreases monotonically and approaches to the anisotropy ratio of the effective mass in higher temperatures. The observed a-axis resistivity on a pyrolytic graphite agrees with the present calculation, but there is large discrepancy for the c-axis. The effect of the stacking fault is estimated, but very high density is required for the explanation of the observed magnitude of ρc.
    Download PDF (1252K)
  • Hideki Ueno, Katsumi Yoshino
    1986 Volume 55 Issue 12 Pages 4382-4387
    Published: December 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Poly(p-phenylene) films were heat-treated at various temperatures up to 2800°C. Heat-treated films are stable in air and show the wide range of electrical conductivity and are remarkably enhanced by heat-treatment above 600°C, which is interpreted in terms of the carbonization. Heat-treated films yield small positive thermoelectric power. From temperature dependences of electrical conductivity and thermoelectric power for the films heat-treated above 800°C, the metallic conduction is working only in the carbonized fragments.
    Download PDF (732K)
  • Morio Suzuki, Takayuki Yamada, Shuzo Kawata
    1986 Volume 55 Issue 12 Pages 4388-4395
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The tunnel conductance characteristics of Pb-SiO1+x-Te doped InSb junctions (0<x<1) were measured at temperatures between 2.6 and 32 K, and were found to show a V-shape zero-bias anomaly. The temperature dependence of the zero-bias anomaly was stronger in junctions fabricated on non-doped InSb than 0.08%Te doped InSb. The temperature dependence of an incremental resistance R(0) was found to largely deviate from that calculated from a collective excitation model and to obey to ln R(0)∝T−1⁄4, where R(0) is a value of (dI⁄dV)−1 at zero bias. The zero-bias anomaly in Pb-SiO1+x-InSb junctions can be explained with a variable-range hopping assisted tunneling, but not with a collective excitation model.
    Download PDF (904K)
  • Hiroshi Ishida
    1986 Volume 55 Issue 12 Pages 4396-4407
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The dependence of the plasmon dispersion in semiconductor superlattices on the dimensionality of subbands is investigated minutely. For this purpose, we present a method to calculate the polarization function of superlattices which explicitly takes account of subband widths and overlaps of electron wavefunctions in neighboring wells. The numerical results for the intrasubband plasmon in the GaAs-AlxGa1−xAs superlattice clearly demonstrate the close interrelation between the plasmon dispersion and the dimensionality of subbands.
    Download PDF (1176K)
  • Hiromichi Ebisawa, Hidetoshi Fukuyama, Sadamichi Maekawa
    1986 Volume 55 Issue 12 Pages 4408-4416
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Effect of electron localization through the dynamically screened Coulomb interaction on the superconducting transition temperature Tc is investigated in the weakly localized regime for dirty thinmetallic wires. Tc is reduced in proportion inversely to the diameter. The effect is larger than for films because of the stronger infrared divergence of the one-dimensional Coulomb interaction.
    Download PDF (868K)
  • Takeshi Hiraoka
    1986 Volume 55 Issue 12 Pages 4417-4422
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Hall effect in antiferromagnetic NdZn has been studied from 4.2 to 200 K. The extraordinary part of the effect (EHE) shows positive peak at TN=70 K and the drastic discontinuity from positive to negative is observed at the moment rotation temperature of TR=17 K. A calculation by the presently defined parallel and perpendicular antiferromagnetic skew scattering Hall effect combined with the effect of crystalline electric field(CEF) of which the ground state Γ8(1) qualitatively reproduces the observed temperature dependencies of EHE.
    Download PDF (596K)
  • Koichi Takasaki, Isao Harada, Takashi Tonegawa
    1986 Volume 55 Issue 12 Pages 4423-4434
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The temperature versus magnetic field phase diagram of the Ising model on a two-dimensional triangular lattice with nearest-neighbor and next-nearest-neighbor interactions is calculated by using the interface method of Müller-Hartmann and Zittartz. Both interactions are assumed to be antiferromagnetic, while the interaction ratio assumes arbitrary positive values. The resulting phase diagrams contain correctly various commensurate phases obtained in the ground state analysis. It is found that no commensurate phase is stable down to zero temperature at certain critical fields. This is explained as a consequence of the geometrical nature of the spin structures of two adjacent commensurate phases. For certain values of the interaction ratio, the phase diagrams are compared favorably with the Monte Carlo results obtained by Saito.
    Download PDF (1136K)
  • Kei-Ichiro Kobayashi, Kazuo Kanematsu
    1986 Volume 55 Issue 12 Pages 4435-4440
    Published: December 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Crystal structure of (YxZr1−x)Co2.9 is the PuNi3 type in x>0.3, four slabs hexagonal structure in 0.3>x≥0.1 and the MgCu2 type at x=0. X-ray diffraction patterns of the compounds show that the three structures are similar each other. The magnetic moment and the Curie temperature decrease with decreasing yttrium content x in x≥0.1. ZrCo2.9 has a larger moment and a higher Curie temperature than (Y0.1Zr0.9)Co2.9. The change of magnetic moment and crystal structure is analysed by the stacking model of Laves type (Y, Zr)2Co4 and CaCu5 type (Y, Zr)Co5 slabs.
    Download PDF (544K)
  • Takejiro Kaneko, Satoshi Arai, Shunya Abe, Kazuo Kamigaki
    1986 Volume 55 Issue 12 Pages 4441-4447
    Published: December 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    The magnetic measurements of the cubic RAuCu4(R=Gd, Tb, Dy, Ho and Er) intermetallic compounds are carried out in the temperature range from 4.2 to 300 K. In the paramagnetic region the reciprocal magnetic susceptibility follows the Curie-Weiss law. With increasing atomic number of rare earth ion the magnetic properties at low temperatures change from antiferromagnetism (R=Gd, Tb) to ferromagntism (R=Dy, Ho, Er). The results are discussed in terms of the RKKY theory.
    Download PDF (584K)
  • Hidetoshi Nishimori, Seiji Miyashita
    1986 Volume 55 Issue 12 Pages 4448-4455
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The magnetization process at T=0 of the spin-1/2 Heisenberg antiferromagnet on the triangular lattice with Ising-like exchange anisotropy is studied. A comparison is made to a corresponding classical system. A plateau of magnetization has been found for an interval of the external field, on which classical spin configurations dominate. Other than on the plateau, quantum effects invalidate the classical picture. A possibility of experimental confirmation of this classical-quantum crossover is also pointed out.
    Download PDF (828K)
  • Kiichi Okuda, Ko Kurosawa, Shozo Saito, Makoto Honda, Zhihong Yu, Mune ...
    1986 Volume 55 Issue 12 Pages 4456-4463
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Magnetic properties of a layered compound MnPS3 were investigated by means of magnetic susceptibility, high field magnetization and electron spin resonance. Temperature and angular dependence of EPR line width are characteristic of 2D-antiferromagnet. The main exchange interaction in the ab-plane is estimated to be Jk=−9.5±0.2 K. High field magnetization process and AFMR measurements at low temperatures below TN=78 K showed a spin-flop transition at Hc=38.0 kOe. They are satisfactorily explained by assuming the uniaxial anisotropy energy K=1.52±0.10×105 erg/cm3 perpendicular to the ab-plane.
    Download PDF (700K)
  • Yoshiei Todate, Yoshikazu Ishikawa, Keisuke Tajima, Syoichi Tomiyoshi, ...
    1986 Volume 55 Issue 12 Pages 4464-4476
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The spin dynamics in a quasi-two dimensional antiferromagnet MnTiO3 has been studied in the temperature range between 7 K and 300 K by means of inelastic neutron scattering with the multi-analyser crystal spectrometer (MAX). The exchange interaction parameters were determined from the spin-wave dispersion relations and it has been confirmed that the two-dimensional antiferromagnetic properties of MnTiO3 are realized by an accidental cancellation of the interlayer exchange interactions.
    Download PDF (1052K)
  • Hitoshi Yamazaki, Mike Warden
    1986 Volume 55 Issue 12 Pages 4477-4484
    Published: December 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Parallel pumping experiments in ferromagnetic (CH3NH3)2CuCl4 are studied at the pumping frequency of 9.39 GHz and the temperature of 1.65 K. Above the spin-wave instability threshold, auto-oscillations of magnon amplitude with a frequency of 8 kHz are observed. As the pumping power is increased, period-doubling, chaos and periodic windows are observed. Phase space portraits and one-dimensional return maps are constructed from the time series data.
    Download PDF (876K)
  • Syuji Kawada, Kazuki Shimura
    1986 Volume 55 Issue 12 Pages 4485-4491
    Published: December 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    The dielectric properties and the phase transition of ice Ih were investigated on RbOH-doped polycrystalline ice. Observed dielectric dispersions were roughly decomposed into two Debye type dispersion branches. The low frequency branch was responsible to the temperature dependence of the dielectric properties and the phase transition. The relaxation time of RbOH-doped ice was about 15 times longer than that of KOH-doped ice, but the activation energy did not alter. The temperature of the phase transition was almost the same as that of KOH-doped ice. Species of the alkali ion was effective to the dielectric relaxation but not to the phase transition temperature. This shows that observed phase transition is the intrinsic one of the ice crystal. The role of OH and alkali ion on the dielectric relaxation and some natures of this phase transition are discussed.
    Download PDF (708K)
  • Masahiro Nakagawa, Tadashi Akahane
    1986 Volume 55 Issue 12 Pages 4492-4499
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The effect of polarization electric field on homogeneous-twist transitions in surface stabilized ferroelectric liquid crystal sample is studied on the basis of the continuum theory. From numerically calculated phase diagrams for an applied DC electric field and the anchoring strength at the boundaries, one may find that twist structure becomes unstable by the polarization electric field due to the spatially distributing polarization charge accompanied with that structure. Consequently, a homogeneous uniform state is found to be more stable rather than a twist state. Some experiments are suggested to clarify the effect of polarization electric field, and the present results are compared with those previously obtained by Pavel.
    Download PDF (836K)
  • Kazuhiro Hara, Yoshihiro Ishibashi
    1986 Volume 55 Issue 12 Pages 4500-4503
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Polarized Raman scattering spectra of LiGa5O8 are observed at room temperature. Two adjacent peaks are newly found in a low frequency region (128 and 135 cm−1). By the site symmetry consideration, we concluded that these peaks correspond to the doubly degenerate and the non-degenerate modes of the translational motion of GaO4 at the tetrahedral site. These two modes are the ones derived by splitting of the triply degenerate translational mode in the disordered state when the order-disorder transition occurs at 1140°C.
    Download PDF (344K)
  • S. Linderoth, H. Rajainmäki, H. E. Hansen, R. M. Nieminen
    1986 Volume 55 Issue 12 Pages 4504-4512
    Published: December 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    We report on low-temperature positron studies for pure, single crystals of the alkali halides KCl, NaCl and NaF. Strong temperature dependences are observed in the lifetime and angular correlation measurements in the temperature range 10–300 K. Delocalized para-positronium is observed at low temperatures in the three crystals. The broadening, with rising temperature, of the narrow peak in the angular correlation curve can be accounted for by the self-trapping model of positronium. The results are discussed in the light of this model, in terms of positronium localization at imperfections and in terms of positron interactions with imperfections created in the spur of the positron. The increased positronium formation with temperature is viewed as an enhanced escape probability of the excess electrons from sinks competing with positronium formation.
    Download PDF (1100K)
  • Minoru Itoh, Satoshi Hashimoto
    1986 Volume 55 Issue 12 Pages 4513-4518
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The dispersion of the refractive index has been studied near the 2s exciton resonance as well as the 1s exciton resonance in thin RbI and KI single crystals at 11 K by applying the Fabry-Perot interference method to them. The results are analyzed using the polariton dispersion formula based on a two-oscillator model. The new fitting of dispersion curves results in revised values of the 1s exciton parameters. In addition, the 2s exciton parameters can also be evaluated. These values of exciton parameters are shown to be in accordance with the data obtained from other experiments.
    Download PDF (756K)
  • Osamu Arimoto, Takuya Mukai, Ken-ichi Kan’no, Yoshio Nakai
    1986 Volume 55 Issue 12 Pages 4519-4527
    Published: December 15, 1986
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Optical conversion between two types of relaxed exciton states in RbCl:I has been investigated by means of double excitation method. When the crystal irradiated with ArF-excimer laser pulse is excited subsequently with N2-laser pulse, emission from the relaxed exciton of one-center type localized on the site of an I ion (NE emission) occurs. Generation of the NE omission is accompanied by a simultaneous decrease of emission from the relaxed exciton of two-center type with the configuration of [ICl+e] (BG emission). Intensity change of induced NE emission as a function of delay of N2-laser pulse irradiation was found to reflect decay times of BG emission. It is concluded that relaxed exciton of two-center type can be converted optically to that of one-center type via its hole-excited state.
    Download PDF (1136K)
  • Toshiaki Shiraishi
    1986 Volume 55 Issue 12 Pages 4528-4542
    Published: December 15, 1986
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The line shape functions and the first, second and third moments of the A-absorption and A-emission bands in KCl:Tl+-type phosphors have been investigated in consideration of the spin-orbit interaction and the electron-lattice interaction with three vibrational modes α1g(Q1), εg(Q2, Q3) and τ2g(Q4, Q5, Q6) within the Condon and Franck-Condon approximations. The linear and quadratic interactions are considered with the anharmonic potential terms in the electron-lattice interaction. In the approximation that the adiabatic potential energy surfaces are described as the quadratic terms of the interaction modes Q around their minimum points, the second and third moments of the A-emission band for the tetragonal distortion are expressed by using the coordinates of the minimum point and the coefficients of the quadratic terms of Q.
    Download PDF (1074K)
feedback
Top