Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
Volume 54, Issue 7
Displaying 1-50 of 62 articles from this issue
  • Kazuhiro Nozaki, Naoaki Bekki
    1985 Volume 54 Issue 7 Pages 2363-2366
    Published: July 15, 1985
    Released on J-STAGE: June 01, 2007
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    A sequence of period-doubling bifurcations is shown to lead to a chaotic attractor in a low dimensional subspace spanned by a soliton and long-wavelength radiation of an infinite dimensional system, which models nonlinear responses of a plasma driven by a capacitor rf field.
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  • Takashi Suzuki, Terutaka Goto, Akira Tamaki, Tadao Fujimura, Yoshichik ...
    1985 Volume 54 Issue 7 Pages 2367-2370
    Published: July 15, 1985
    Released on J-STAGE: May 29, 2007
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    Temperature dependences of the elastic constants of the Kondo lattice substance CeCu6 have been measured by the ultrasonic method. The transverse C66 mode exhibits a complete softening, which is associated with the structural phase transition from the orthorhombic D2h16 to the monoclinic C2h5 structures at Tc=168 K. The crystalline electric field effect has been observed in the softening of the elastic constants below about 100 K. The longitudinal C11 and C33 modes show a remarkable softening below 10 K, which is related to the excitation of the Kondo lattice.
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  • Takehiko Oguchi, Takuma Ishikawa
    1985 Volume 54 Issue 7 Pages 2371-2373
    Published: July 15, 1985
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    The real-space renormalization group theory using the first order cumulant is applied to the q-state antiferromagnetic Potts model on 2-d (dimensional) and 3-d lattice. The special features of this paper are that the Potts states are represented by q unit vectors in q−1 dimensional space and the two-sublattice structure is preserved after the renormalization transformation. The critical exponents obtained for q=2 in 3-d are in fairly good agreement with the reliable values and those for q=3 and 4 are obtained for the first time.
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  • Taizo Sasaki, Hideo Asahina, Akira Morita
    1985 Volume 54 Issue 7 Pages 2374-2377
    Published: July 15, 1985
    Released on J-STAGE: May 29, 2007
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    The magnitude of the bond charge of black phosphorus is determined from the self-consistent pseudopotential band calculation. The result is in good agreement with Phillips’ conjecture. It is found that the contribution of the bond charge to the crystal pseudopotential is important.
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  • Hidetoshi Fukuyama
    1985 Volume 54 Issue 7 Pages 2378-2381
    Published: July 15, 1985
    Released on J-STAGE: May 29, 2007
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    Effects or strong spin fluctuations induced by the Anderson localization are investigated on the quantum corrections to conductivity and magnetoresistance based on the Hubbard model together with long range Coulomb interactions. The present mechanism predicts a large spin dependent magnetoresistance, which will explain at least the trend observed in the various experiments which has been so far left unanswered.
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  • Satoshi Okuma, Fumio Komori, Youiti Ootuka, Shun-ichi Kobayashi
    1985 Volume 54 Issue 7 Pages 2382-2385
    Published: July 15, 1985
    Released on J-STAGE: May 29, 2007
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    The conductivity σLT of disordered copper films without and with magnetic impurities was measured at low temperature in order to study the metal-insulator transition. In both films, a continuous transition was observed with the increase of disorder and σLT was fitted to a scaling form with the same exponent of unity using high temperature conductivity as a parameter. These results are discussed along the recent scaling theory for interacting electrons.
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  • Yoshikazu Suzumura
    1985 Volume 54 Issue 7 Pages 2386-2389
    Published: July 15, 1985
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    The role of the electron hopping between chains in quasi-one-dimensional superconductors is studied based on the work by Brazovskii and Yakovenko [J. Phys. Lett. 46 (1985) L–111]. It is shown that strong intrachain interactions give rise to the tunneling of a pair of electrons in the BCS state whereas weak intrachain interactions lead to the individual electron hopping and the BCS state is destroyed.
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  • Hiroshi Tanino, Katsuo Kato, Madoka Tokumoto, Hiroyuki Anzai, Gunzi Sa ...
    1985 Volume 54 Issue 7 Pages 2390-2392
    Published: July 15, 1985
    Released on J-STAGE: May 29, 2007
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    Values of the lattice constants of the organic conductor β-(BEDT–TTF)2I3 up to 2 GPa at room temperature are obtained by Buerger precession method and the compressibilities dxxdp [/GPa] are determined as −0.044, −0.032 and −0.026, where x=a, b and c, respectively. The anisotropy factor of the compressibilities is less than 2, in contrast with the quasi-one-dimensional case of (TMTSF)2PF6. The difference is caused by the two-dimensional character of the electronic structure originated from the corrugated network of BEDT–TTF molecules.
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  • Hidetoshi Fukuyama
    1985 Volume 54 Issue 7 Pages 2393-2396
    Published: July 15, 1985
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    Effects of spin fluctuations induced by the Anderson localization in interacting electron systems are investigated on the superconductivity. The result indicates the existence of strong depairing mechanism proportional to temperature, whose prefactor diverges at certain value of randomness resulting in the complete destruction of superconductivity.
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  • E. Simánek
    1985 Volume 54 Issue 7 Pages 2397-2400
    Published: July 15, 1985
    Released on J-STAGE: June 01, 2007
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    The effective dielectric constant of a tunnel junction of identical superconductors is calculated with use of the Kramers-Kronig dispersion relation. At T=0, a new expression for the renormalized capacitance of a weakly coupled junction is derived which is parametrized by x=e2⁄2; the ratio of electrostatic charging energy to the superconducting gap Δ. For x<<1 the results agree with the recent calculation of Eckern, Schön and Ambegaokar. Significant differences are found for x≥1: The renormalization is strongly reduced and remains finite for Δ=0. The theory finds useful application in the theory of phase ordering in granular superconductors.
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  • Kazuo Gesi
    1985 Volume 54 Issue 7 Pages 2401-2403
    Published: July 15, 1985
    Released on J-STAGE: June 01, 2007
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    Single crystals of Rb2CoCl4 and Rb2CoBr4 were grown from melt, and dielectric constants were measured along the three crystallographic axes down to liquid helium temperature. Below the ferroelectric Curie temperature Tc (Tc=192 K for Rb2CoCl4 and 180 K for Rb2CoBr4) there are one phase transition at 66 K in Rb2CoCl4 and two transitions at 95 K and 65 K in Rb2CoBr4. Dielectric anomalies at these low temperature transitions in Rb2CoX4 (X: Cl, Br) are quite similar to those in the corresponding Rb2ZnX4 crystals.
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  • Tadahiko Harami, Shouhei Kakigi, Akizo Okuda
    1985 Volume 54 Issue 7 Pages 2404-2405
    Published: July 15, 1985
    Released on J-STAGE: May 29, 2007
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    Optical properties of RbI crystals, which were additively-colored with iodine or electrolytically-colored by the pointed-anode method, have been studied. After coloration, two bands assigned as V2 and V3 bands are observed at 358 and 287 nm, respectively, at 77 K. Dichroism is induced in both bands at 77 K by irradiation with the [110]- or [100]-polarized V2 light. Upon irradiation with the V3 light at 68 K or at 125 K, the V2 and V3 bands are bleached and a few bands are formed simultaneously in the uv and visible regions. In addition to the properties of the V2 and V3 bands, spectral positions of the newly formed bands are consistent with the previous results of KI. It is concluded then that V centers introduced into halogen-excess crystals of RbI and KI have the same structures.
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  • Masato Yoshimori, Hiroyuki Watanabe
    1985 Volume 54 Issue 7 Pages 2406-2408
    Published: July 15, 1985
    Released on J-STAGE: June 01, 2007
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    Numbers of solar protons accelerated at flare sites are derived from gamma-ray observations of the C deexcitation line at 4.44 MeV and the neutron capture line at 2.22 MeV from the 1981 Apr. 1, 1981 May 13, 1981 Oct. 15 and 1982 June 6 flares. The derived numbers of protons accelerated to energies above 10 MeV are of the order of 1032. The number of protons producing gamma-ray lines seems to be much higher than the number of escaping protons from the Sun. The present result suggest that most of protons stream down and produce gamma-ray lines, and only a small fraction of protons escapes into interplanetary space.
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  • Ryogo Hirota
    1985 Volume 54 Issue 7 Pages 2409-2415
    Published: July 15, 1985
    Released on J-STAGE: June 01, 2007
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    The classical Boussinesq equation ut=[(1+u)v+vxx]x, vt=(u+v2⁄2)x describing shallow water waves, is transformed into the bilinear form and is shown to be a “pq=const” reduction of the modified KP equation. It is also shown that the bilinear form of the classical Boussinesq equation is transformed into the non-linear Schrödinger equation exhibiting dark-soliton solution.
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  • Masakazu Ichiyanagi
    1985 Volume 54 Issue 7 Pages 2416-2426
    Published: July 15, 1985
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    We construct a quantum statistical theory for nonequilibrium hydrodynamic systems which is based on the collective description of a bose fluid. It is proposed that the fluctuations around the Onsager variables can be treated in terms of the collective coordinates which are the auxiliary variables grounded upon the existence of the adiabatic motions of the fluid. The nonlinear hydrodynamic equations are derived from a new stand point of view. A special attention has been put on the treatment of the reaction of heat bath to the hydrodynamic motions.
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  • Masakazu Ichiyanagi
    1985 Volume 54 Issue 7 Pages 2427-2435
    Published: July 15, 1985
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    A new formulation is given of the critical fluctuation of the superfluid order-parameter. It concerns attempts to derive from fundamental principles the equation of motion of the superfluid order-parameter. It is shown that critical fluctuations of the superfluid order-parameter can be described in terms of quasiparticle fields. The present considerations, predominantly formal, are shown to give a reasonable justification to Pitaevskii’s method of procedure and to provide a good quantitative picture of the critical dynamics of superfluid.
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  • H. Khushnood, A. Shakeel, M. Irfan, A. Ahmad, M. Shafi
    1985 Volume 54 Issue 7 Pages 2436-2441
    Published: July 15, 1985
    Released on J-STAGE: May 29, 2007
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    An experimental study has been undertaken to determine the cluster size in p-N interactions at 400 GeV. The maximum number of charged particles constituting a cluster has been observed to be four. Comparison of this finding with those obtained for 50 GeV π-nucleus, 400 GeV p-nucleus and 1000 GeV p-N reactions earlier, leads to the conclusion that the cluster size is independent of the identity and energy of the incident hadron which indicates that the dynamics of the cluster formation and hence the mechanism of hadronization in the final stage is probably the same in both types of reactions at high energies.
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  • Shigeki Mori
    1985 Volume 54 Issue 7 Pages 2442-2452
    Published: July 15, 1985
    Released on J-STAGE: June 01, 2007
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    Monte Carlo calculations on nuclear spallation reactions with high energy protons were performed by using a model for intranuclear cascade reactions in the energy range up to 1000 GeV and a nuclear model for the evaporation process. The scale factor of the characteristic particle production distance δ and the nuclear density reduction factor D were used in the cascade model in order to simulate the energy dependence of particle production from heavy target nuclei and mass-yield distributions for spallation products in the incident proton energy range above several GeV. The general characteristics of calculated mass-yield curves were determined primarily by the two parameters δ and D and they are in reasonable agreement with experimental data.
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  • Hideki Hamagaki, Yoshijiro Shida, Hiromichi Kamitsubo, Hirokane Kawaka ...
    1985 Volume 54 Issue 7 Pages 2453-2461
    Published: July 15, 1985
    Released on J-STAGE: June 01, 2007
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    Multiplicity of gamma-rays from the fission fragments was measured in the α-induced fission of 232Th, at the beam energy of 30 to 65 MeV. Incident energy dependence of γ-ray multiplicity as a function of fragment mass was obtained at each incident beam energy. Dependence of γ-ray multiplicity on the beam energy was compared with a classical calculation of transfer of angular momentum. Possible causes of the difference of the multiplicity between the symmetric and asymmetric mass region are discussed.
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  • Ryuji Takaki, Ken Adachi
    1985 Volume 54 Issue 7 Pages 2462-2469
    Published: July 15, 1985
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    A hydrodynamical model is developed to analyse vibration of a liquid drop on a horizontal bed. The drop has a flattened shape by the gravity and the surface tension. The fluid is assumed inviscid and to move nearly horizontally, so that the shallow water theory is applied, and a set of governing equations for the vibration is derived. It is applied to a small-amplitude oscillation and a normal mode solution is obtained, where the drop shows a standing wave along its periphery. The predicted vibration frequency agrees with the experiment by the present authors.
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  • Mitsuaki Funakoshi
    1985 Volume 54 Issue 7 Pages 2470-2476
    Published: July 15, 1985
    Released on J-STAGE: June 01, 2007
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    Steady long periodic internal waves of small amplitude in a two-layer fluid with a rigid upper boundary are examined under the assumption of no difference between mean horizontal velocities in each layer. When the depth ratio in quiescent state is close to a certain value σc determined by density ratio, the Korteweg-de Vries equation does not describe well such waves. For this case an equation including both quadratic and cubic nonlinear terms as well as dispersive term is derived. By taking the long-wave limit of periodic solutions to this equation, a shock like solution as well as a solitary wave solution of elevation or depression is obtained. One of the depth ratios at two flat regions for the shock like solution is larger than σc, and the other is smaller than σc. The velocity of this solution is independent of its amplitude. The amplitude of the solitary wave solution has a certain upper limit.
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  • Muhammad Umar Farooq, Yukio Kaneda
    1985 Volume 54 Issue 7 Pages 2477-2484
    Published: July 15, 1985
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    The hydrodynamic interaction between two (equal and unequal) spherical particles moving in a fluid is investigated by the method of matched asymptotic expansions in the small Reynolds number (Re). The particles are considered so close that each lies in the inner region of expansion of the other. The flow is assumed axisymmetric. The drag forces on one of the spheres in the leading and in the trailing positions of a uniform flow are determined upto the term of O(Re) for an arbitrary separation between the spheres’ centers. Results for large separation are favourably compared with those reported previously by the method of reflection and the case of small separation is discussed. For equal spheres, the minimum value of interactive (attractive) force is obtained approximately at the spheres’ separation of 3.5.
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  • Nobuaki Ikuta, Hidenori Itoh, Nobuyuki Okano, K\={o}ji Yamamoto
    1985 Volume 54 Issue 7 Pages 2485-2493
    Published: July 15, 1985
    Released on J-STAGE: May 29, 2007
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    The well known formula of isotropic diffusion coefficient Dv of electrons does not give exact values of lateral diffusion coefficient DT under an electric field. Dv implies the ensemble average of the instantaneous probability of diffusion, while DT is obtained as the time average of diffusion flux. The cause of the discrepancy between Dv and DT is the change of the collision frequcncy within respective flights of electrons due to the electric field. Problems concerning Dv and DT are made clear from relevant quantities calculated by the analytical method and by the Monte-Carlo simulation for various model cross sections.
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  • Takeo Soga
    1985 Volume 54 Issue 7 Pages 2494-2502
    Published: July 15, 1985
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    A weak evaporation from a droplet was studied based upon a linearized kinetic model equation which yields correct thirteen moments derived from the Boltzmann equation. The basic equation was solved using a singular perturbation method. Obtained results showed that density and temperature jumps at the droplet surface were weakly dependent upon the model equations if they were measured in the same length scale and against certain extensive values such as mass flux or heat flux. These extensive values of order O(Kn) were, however, dependent upon the Prandtl number through the heat conductivity, while they were little dependent upon a scaling factor of the collision frequency. The thickness of the Knudsen layer was however stretched by the inverse of the scaling factor compared with the one of the BGK model equation.
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  • Katsumichi Hoshino, Takumi Yamamoto, Akimasa Funahashi, Norio Suzuki, ...
    1985 Volume 54 Issue 7 Pages 2503-2515
    Published: July 15, 1985
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    Electron cyclotron heating (ECH) and pre-ionization using a 28 GHz 200 kW gyrotron were investigated in the JFT-2 tokamak. Three modes of the wave were launched from different types of launch system, i.e. the extraordinary mode from the high field side of the torus, the ordinary mode from the low field side, and TE02 mode from the top to examine their heating characteristics. The oblique launch of the extraordinary mode gave the largest central heating in consistent with the theoretical prediction. It was shown that the polarization of the launched wave as well as the effect of the mode conversion at the upper hybrid resonance layer contribute to the heating mechanism.
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  • Satoru Iizuka, Poul Michelsen, Jens Juul Rasmussen, Roman Schrittwiese ...
    1985 Volume 54 Issue 7 Pages 2516-2529
    Published: July 15, 1985
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    Investigations of double layer dynamics are performed in a Q-machine plasma by applying a positive step potential to a cold end-plate collector. The double layer created at the grounded plasma source just after the pulse is applied propagates towards the collector with the plasma flow speed. Large oscillations occur in the plasma current which is related to a recurring formation and propagation of the double layer. The current is limited during the propagation by a growing negative potential dip formed on the low-potential tail. Similar phenomena appear on the low-potential tail of the stationary double layer formed by applying a potential difference between two plasma sources.
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  • Katsusuke Shimizu, Masatada Ogasawara
    1985 Volume 54 Issue 7 Pages 2530-2536
    Published: July 15, 1985
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    Effect of banana orbit of the trapped particle on the dissipative trapped ion instability (DTII) is investigated. As the frequency of the DTII is much smaller than the bounce frequency, wave potential is averaged over the bounce period or along the banana orbit of the trapped particle. With this averaged wave potential, dispersion relation is obtained including the effect of the banana orbit. Stabilizing effect is not so large as expected. The growth rate is positive for the wide range of the poloidal mode number m. Previous results, based on the growth rate which makes use of an analogy to the finite Larmor radius effect, overestimate the damping by the effect of the banana orbit incorrectly.
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  • Shigenori Tanaka, Setsuo Ichimaru
    1985 Volume 54 Issue 7 Pages 2537-2542
    Published: July 15, 1985
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    We calculate the stopping power of the degenerate electron liquid at metallic densities in the dielectric formalism. The strong Coulomb-coupling effects beyond the random-phase approximation are taken into account through the static and dynamic local-field corrections. It is shown that those strong-coupling and dynamic effects act to enhance the stopping power substantially in the low-velocity regime, leading to an improved agreement with experimental data.
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  • Yasuaki Sugizaki, Sadae Yamaguchi, Shinya Hashimoto, Makoto Hirabayash ...
    1985 Volume 54 Issue 7 Pages 2543-2551
    Published: July 15, 1985
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    Short-range order parameters for oxygen arrangement in a single crystal of ZrO0.30 quenched from above the order-disorder transition temperature were determined by measurements of elastic neutron diffuse scattering. The preferential configurations of vacancy-oxygen atom pair are found at the first and second neighbors of octahedral interstitial sites in the host hcp metal latitce, whereas the oxygen-oxygen atom pairs occur at the third, fourth and fifth neighbors. These features are similar to those in long-period ordered structures. The first-order atomic displacement parameters for O–Zr pairs indicate that the metal atoms move away from vacancies and no near the oxygen atoms.
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  • Shin’ichi Takeda, Shigeru Tamaki, Yoshio Waseda
    1985 Volume 54 Issue 7 Pages 2552-2558
    Published: July 15, 1985
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    A new quantitative method for evaluating the ion-electron correlation functions in liquid metals is proposed by using the measured structural data of X-ray and neutron diffraction with high accuracy. The method has been applied to liquid Bi and Sn and the radial distribution of valence electrons around the ion has been obtained. The ionic radii for Bi5+ and Sn4+ can also be derived from these results and they agree very well with those proposed by Pauling.
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  • Takuyuki S. Uragami
    1985 Volume 54 Issue 7 Pages 2559-2564
    Published: July 15, 1985
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    The intensity distribution of X-ray wave field in Bragg case in a deformed crystal is calculated by solving Takagi’s equations for an incidence of a very narrow wave. The intensity flow which will contribute to a formation of the image for a deformation in a crystal can be seen separate from the intensity distribution due to the direct reflection of incident wave on the entrance surface. A method for the topographic observation of a deformation almost without the intensity to give rise to a background is suggested. This method would be used for the traverse topography as well as the section one in Bragg case. It is also discussed that the suggested topographic method may be arranged to select an area to observe.
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  • Toshio Kosugi, Yoshiaki Kogure, Yosio Hiki
    1985 Volume 54 Issue 7 Pages 2565-2575
    Published: July 15, 1985
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    Attenuation of longitudinal pulsed ultrasound at frequencies between 27 and 99 MHz has been measured in LiF and NaCl crystals under hydrostatic oil pressure up to 3500 kg/cm2 at room temperature. Specimens used were in two different states: deformed to introduce dislocations, and irradiated by γ rays to eliminate the effect of dislocation vibration. From the pressure dependences of sound attenuation in the two states, the pressure dependence of the damping constant for dislocation motion was determined by an analysis based on the Granato-Lücke theory of overdamped resonance of dislocations. The results for LiF and NaCl crystals of high purity were well understood by considering the non-linearity mechanism or the fluttering mechanism of dislocation damping. For an impure LiF crystal, the pressure dependence of damping constant was found to be very different from that for the pure crystal.
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  • Yosuke Kayanuma, Hiroshi Yamada, Satoshi Tanaka
    1985 Volume 54 Issue 7 Pages 2576-2587
    Published: July 15, 1985
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    A Green function formalism is developed for the resonant scattering of acoustic phonons by randomly distributed two-level systems. The randomness is treated by the coherent potential approximation. The theory reproduces the Jacobsen-Stevens dispersion law in the dense limit of the concentration of the two-level system and the results obtained so far by the average t-matrix approximation in the dilute limit. The gradual change of the character of the resonantly scattered phonons as the concentration is varied is investigated through the calculation of various quantities such as the phonon density of states, the neutron scattering cross sections and the sound velocity.
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  • Ken-ichi Tsuchiya, Misuzu K. Kunio, Kazutoshi Ohashi, Yoshiko H. Ohash ...
    1985 Volume 54 Issue 7 Pages 2588-2594
    Published: July 15, 1985
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    The dynamics of an impurity hydrogen in magnesium is investigated by using the pair potential technique. We have calculated the pair potential between hydrogen and magnesium, taking account of the non-linear screening effects of an impurity hydrogen. By use of it, we have calculated the energy profile for interstitial hydrogen and the force constants between hydrogen and magnesium. As the results of them, it is found that the minimum point of energy is too shallow to localize the interstitial hydrogen, and that the coupling between substitutional hydrogen and the nearest neighbor magnesium ion is very weak.
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  • Yoshiaki Ozaki, Kazuo Maki, Kenkichi Okada, James A. Morrison
    1985 Volume 54 Issue 7 Pages 2595-2602
    Published: July 15, 1985
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    The rotational energy levels of NH4+ in dilute solution in KBr have been calculated for three possible orientations of a tetrahedral ion in an octahedral field. Both tunneling and librational levels have been obtained. It is concluded that the inelastic neutron scattering spectra, which were reported in part I [J. Phys. Soc. Jpn. 52 (1983) 2401], are best accounted for on the basis of C3v orientation of the NH4+ ions on the cation lattice sites.
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  • Mamoru Ishizuka
    1985 Volume 54 Issue 7 Pages 2603-2606
    Published: July 15, 1985
    Released on J-STAGE: May 29, 2007
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    AC susceptibilities of Mn(HCOO)22H2O were measured to investigate a phenomenon of the fluctuation of uniform magnetization near the critical temperature (TN=3.686 K) under extremely weak magnetic field (temperature Barkhausen effect). As the phenomenon has suggested the movement of the complicated domain structure in the course of development of the spontaneous magnetization, the measurements were made in three alternative conditions which give different domain patterns. We found that the susceptibility has a large peak around TN and a long tail below TN in the same condition of observing the T.B.E. fluctuation. Co(HCOO)22H2O was also examined as a salt having different symmetry type of interaction from that of Mn(HCOO)22H2O. Small but sharp spikes were observed in the uniform magnetization in the course of decreasing temperature.
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  • Sigeo Ihara, Katsuo Suzuki
    1985 Volume 54 Issue 7 Pages 2607-2619
    Published: July 15, 1985
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    Superionic conductor Ag3SI is simulated by the molecular dynamics with a simple ionic potential for both α and β phases. The simulated result show that Ag ions stay near 6(b) sites of the anion bcc lattice in β phase, while they diffuse preferentially occupying 12(d) sites of the bcc lattice in α phase. The calculated Debye-Waller factor of the anions and the self-diffusion constant of Ag ions are in good agreement with the experiments. The velocity autocorrelation functions, the current-current correlation function and their frequency spectra are also obtained. The calculated moment ratio of the displacement suggests that the migration mechanism of Ag ions in α phase is a discrete hopping rather than a continuous motion.
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  • Tsuyoshi Murao
    1985 Volume 54 Issue 7 Pages 2620-2625
    Published: July 15, 1985
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    The analytical solution of the G–L equation has been presented in the previous paper for the surface-induced precursor effect of phase transitions with an approximate boundary condition, and the precursor effect in Pr metal and A-15 compounds has been discussed in conjunction with the above result. By taking the exact boundary condition, the numerical solution of this problem is calculated for the two cases; (I) polarization in a “paramagnetic” system when external field is present at half space; (II) the overall polarization when there is the over-critical region at surface. These present solutions are compared with the previous analytical solution.
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  • Sukla Mukhopadhyay, T. K. Mitra
    1985 Volume 54 Issue 7 Pages 2626-2634
    Published: July 15, 1985
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    The optical polaron bound in a Coulomb potential is investigated using a simple canonical transformation. The freedom in the choice of the generator of the transformation in this method is utilised to calculate the ground state for different types of trial generators. The results for different ranges of the coupling constant α and the Coulomb impurity parameter β are critically examined and compared with the major available results due to others. In view of the overall good and selectively excellent results obtained and in view of its simplicity the method appears to be useful.
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  • Yositaka Yosida, Sei-ichi Tanuma, Yasuhiro Iye
    1985 Volume 54 Issue 7 Pages 2635-2640
    Published: July 15, 1985
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    The anisotropic susceptibility of the stage 2 and 3 SbCl5-graphite intercalation compounds (GIC) has been studied by using the Faraday method and the torque method in the temperature range from 4.2 K to 300 K. For the stage 2 SbCl5–GIC, χorb,⁄⁄(H⁄⁄c-axis) and χorb,⊥(H⊥c-axis) are estimated as (−112∼−63)×10−6 emu/mol and (+19∼+68)×10−6 emu/mol when the value for the susceptibility of the SbCl6 ion is chosen as −131×10−6 emu/mol and the charge transfer coefficient f is chosen as 0.24∼0.67. The orbital susceptibility of the acceptor GIC is diamagnetic in contrast to the orbital paramagnetism of the donor GIC. This asymmetry between the donor and the acceptor GIC cannot be explained in the framework of the theory by Safran and DiSalvo.
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  • Yoshiyuki Ono, Yasushi Ohfuti, Akira Terai
    1985 Volume 54 Issue 7 Pages 2641-2665
    Published: July 15, 1985
    Released on J-STAGE: June 01, 2007
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    Numerical analyses of the various states with nonlinear excitations in one-dimensional nearly one-third filled electron-phonon systems are performed by using Su-Schrieffer-Heeger’s model originally proposed for polyacetylene. The states are determined by solving numerically the self-consistent equations satisfied by the lattice displacement and the electronic wave functions. Different solutions are obtained for different values of the excess electron number δn=Ne−2N⁄3 with N the total number of the lattice sites and Ne the total electron number; the cases with δn=±1⁄3, ±2⁄3, ±1, ±4⁄3, ±5⁄3 and ±2 are considered. Through comparison of the energies for δn=0 and δn≠0, the creation energies of various nonlinear excitations are calculated and shown to depend not only on the absolute value but also on the sign of the charge of the excitations.
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  • Tsuneo Watanabe, Akinari Kasai
    1985 Volume 54 Issue 7 Pages 2666-2670
    Published: July 15, 1985
    Released on J-STAGE: May 29, 2007
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    The temperature dependence of the electron mobility in molybdenum ditelluride single crystals has been measured in the temperature range between 8 K and 830 K. The results are examined with the three dimensional Schmid’s model and two dimensional Fivaz’s model for homopolar optical phonon scattering. The temperature dependence in high temperature region above about 350 K is well explained by Schmid’s model.
    The resistivity anisotropy ρ⁄⁄c⁄ρ⊥c is also presented.
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  • Tsuneya Ando
    1985 Volume 54 Issue 7 Pages 2671-2675
    Published: July 15, 1985
    Released on J-STAGE: May 29, 2007
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    The broadening of the inter-subband absorption is calculated in space-charge layers on a Si surface. Scatterers are assumed to be dominated by charged ions at the Si-SiO2 interface. Among two different contributions to the broadening, the intra-subband process shows a drastic dependence on the strength of the depletion field, while dependence is smaller for the inter-subband process. The results explain recent experiments in accumulation layers on the Si (100) surface where extra Na+ ions are intentionally introduced at the interface.
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  • Tsuneya Ando
    1985 Volume 54 Issue 7 Pages 2676-2681
    Published: July 15, 1985
    Released on J-STAGE: June 01, 2007
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    A simplified approximation scheme is proposed for the calculation of subband energy levels in space-charge layers on narrow-gap semiconductors. The method consists of using the potential calculated in the classical approximation and also the WKB approximation. Its validity is demonstrated through comparison with results of more elaborate self-consistent calculations.
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  • Koichi Kitazawa, Michio Naito, Takao Itoh, Shoji Tanaka
    1985 Volume 54 Issue 7 Pages 2682-2689
    Published: July 15, 1985
    Released on J-STAGE: May 29, 2007
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    The McMillan’s electron-phonon coupling constant λ was calculated by the McMillan-Allen-Dynes equation from the available experimental results, including measurements on resistivity, Hall coefficient, Seebeck coefficient, specific heat and plasma reflectivity. A simple single band was assumed to obtain the electron-electron repulsion coefficient μ* by the Morel-Anderson equation. The coupling constant λ increases with bismuth content x, reaching 1.15 to 1.32 at x=0.2 where Tc is 10.7 K, indicating that BaPb1−xBixO3 is a strong-coupling superconductor in spite of its reported low density of states N(EF). The value λ⁄N(EF) of this material was found out to be extremely large if compared with conventional high Tc superconductors. Furthermore the metal-semiconductor phase transition observed in this system is suggested to be induced as the result of the strong electron-phonon interaction.
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  • Hideoki Kadomatsu, Makoto Isoda, Kiyokazu Tohma, Hironobu Fujii, Tetsu ...
    1985 Volume 54 Issue 7 Pages 2690-2699
    Published: July 15, 1985
    Released on J-STAGE: June 01, 2007
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    The magnetization of Fe2P single crystal was measured as a function of magnetic field H, temperature T and hydrostatic pressure p, for 0≤H≤20 kOe, 4.2 K≤T≤260 K and 0≤p≤14 kbar. It was found that the pressure-induced new magnetic phase below T=170 K and above p=5 kbar is the antiferromagnetic with one and unusual two steps metamagnetic behaviours. H-T magnetic phase diagrams were obtained at various pressures and they contains ferromagnetic, antiferromagnetic, intermediate and paramagnetic phases. In contrast with the drastic change in the Curie temperature with pressure, the magnetization at 4.2 K was pressure-insensitive. The pressure-induced magnetic transition and the antiferromagnetism of Fe2P are qualitatively discussed on the basis of the competition between the two different interactions and of the itinerant electron theory recently developed.
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  • Hirofumi Wada, Yoshitoshi Muraoka, Masayuki Shiga, Yoji Nakamura
    1985 Volume 54 Issue 7 Pages 2700-2707
    Published: July 15, 1985
    Released on J-STAGE: June 01, 2007
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    The forced volume magnetostriction of Fe–Al alloys in the concentration range from 15 to 36.5 at%Al has been measured at 4.2 K, 77 K and room temperature. The results were analyzed on the basis of a phenomenological theory of magneto-volume effects, where the volume change is classified into two contributions, the 3d band polarization and the volume dependence of exchange interaction between local moments. It is shown that the band polarization effect is dominant for volume magnetostrictions in cluster glass alloys (Al>30 at%) as well as in ferromagnetic alloys (Al<30 at %). The analysis gives a rough estimate of the intrinsic band susceptibility, which is strongly enhanced around the critical concentration for the collapse of a long range ferromagnetic order.
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  • Kuniyuki Koyama, Norio Terata, Motohiro Matsuura
    1985 Volume 54 Issue 7 Pages 2708-2713
    Published: July 15, 1985
    Released on J-STAGE: June 01, 2007
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    Spontaneous subsystem magnetizations in a heterogeneous system Mn(HCOO)2·2D2O are separately determined by observing and analyzing the proton NMR at zero field. The temperature dependence of spontaneous staggered magnetization LA of A subsystem consisting of antiferromagnetically coupled quadratic Heisenberg (100) planes follows to two distinct exponential laws. The critical index β=0.22±0.02 for 2×10−2<ε<0.5 and β=0.31±0.02 for ε<2×10−2 indicating apparently a three-dimensional nature of ordering. While, the temperature dependence of η≡LALB indicates that B subsystem consisting of noninteracting paramagnetic (200) planes does not contribute essentially to the phase transition of A subsystem at TN.
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  • Motohiro Matsuura, Kuniyuki Koyama, Youichi Murakami
    1985 Volume 54 Issue 7 Pages 2714-2719
    Published: July 15, 1985
    Released on J-STAGE: May 29, 2007
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    A simultaneous measurement of susceptibility and spontaneous magnetization of a S=5⁄2 quadratic Heisenberg antiferromagnet with weak canting interaction, Mn(HCOO)2·2H2O has been made at exact zero field in the immediate neighbourhood of TN. The critical exponents γ of the staggered susceptibility above TN and β of the spontaneous staggered magnetization below TN are derived to be 1.7±0.1 and 0.31±0.02, respectively in the same temperature range 5×10−4\lesssimε(=|TTN−1|)\lesssim1×10−2. Such characteristic critical phenomena asymmetric against TN look apparently inconsistent with the scaling law and the universality in the conventional sense.
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  • Tatsuo Kanashiro, Takashi Ohno, Mitsuo Satoh
    1985 Volume 54 Issue 7 Pages 2720-2724
    Published: July 15, 1985
    Released on J-STAGE: May 29, 2007
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    The line shapes of the quadrupole-split lines of 23Na in NaNO2 have been measured at room temperature with the applied magnetic field along the a and c axes. Asymmetry of two observed satellite lines is compared with a calculation based on a two-spin Hamiltonian with the dipole coupling between adjacent 23Na nuclei along the a direction. The result shows that the signs of components of the electric field gradient at the 23Na site are positive for Vaa and Vcc, and negative for Vbb.
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