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Masatoshi Imada
1984 Volume 53 Issue 9 Pages
2861-2864
Published: September 15, 1984
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The negative sign problem is a serious difficulty with most existing Monte Carlo methods of evaluating fermion systems of greater than one-dimension because it makes the computation of physical variables practically impossible. A simple and general averaging method is proposed for many-fermion systems. This method is completely free of the negative sign problem. The efficiency and convergence are verified in the Feynman’s path integral calculations of a few simple models.
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Yoshimasa Isawa
1984 Volume 53 Issue 9 Pages
2865-2867
Published: September 15, 1984
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The quantum correction of the conductivity by the localization effect is evaluated in the presence of the inelastic scattering due to screened Coulomb interaction.
We find the contribution to the inelastic scattering time proportional to
T−1 as well as
T−3⁄2 in 3-dimensional system, indicating that the crossover will be observed at some temperature.
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Shinji Kawaji, Yoichi Kawaguchi
1984 Volume 53 Issue 9 Pages
2868-2871
Published: September 15, 1984
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Magnetic field dependence of magnetoconductivity in Si-MOS(001)
n-channel inversion layers is analysed by fitting recently developed Kawabata’s theory to experimental data. The theory is applicable to higher magnetic field region than Hikami, Larkin and Nagaoka’s theory and takes the intervalley scattering effect into account. Temperature dependence of the inelastic scattering time τ
ε is discussed in terms of Fukuyama and Abrahams’ theory for electron-electron scattering with large momentum transfer and Altshuler
et al.’s theory for that with small momentum transfer.
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Kazuo Sasaki
1984 Volume 53 Issue 9 Pages
2872-2874
Published: September 15, 1984
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Soliton contributions to dynamical structure factors of the easy-plane antiferromagnetic chain in a symmetry breaking magnetic field are studied in the sine-Gordon approximation. By considering deviation from perfect antiparallel alignment of neighboring spins, it is shown that low-frequency peaks due to solitons appear around the ferromagnetic Bragg point. They may be observable by the neutron scattering experiment on TMMC.
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Norimichi Kojima, Ikuji Tsujikawa, Hidenobu Hori, Hiroshi Nishimura, M ...
1984 Volume 53 Issue 9 Pages
2875-2878
Published: September 15, 1984
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Optical absorption spectra of YbCrO
3 have been investigated by using a pulsed high magnetic field. As the magnetic field is increased along the
a-axis of YbCrO
3 at 4.2 K, the energy position of the Cr
3+ exciton—Yb
3+ spin flip combined transition (
R′ band) shifts to the higher energy side and its intensity becomes large. In the field region (
H0\gtrsim30 T) where the energy position of the
R′ band approaches to that of the magnon sideband (Cr
3+ exciton—Cr
3+ magnon combined transition), the intensity of the
R′ band increases by one or two orders of magnitude and then approaches to that of the magnon sideband. It was concluded that the noticeable increase of the intensity of
R′ band under the magnetic field along the
a-axis is attributed to the strong hybridization of the
R′ band and the magnon sideband.
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Tsutomu Kawata
1984 Volume 53 Issue 9 Pages
2879-2884
Published: September 15, 1984
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A basic 2×2-matrix Riemann-Hilbert problem is studied and its complete connection to the associated eigenvalue problem is made clear. A potential formula independent on the spectral parameter λ is derived by considering a transformation contributed from the continuous data. As a by-product we get a mapping from the variation of scattering data to the one of potentials.
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Kazuya Kobayashi
1984 Volume 53 Issue 9 Pages
2885-2898
Published: September 15, 1984
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The Wiener-Hopf technique is one of the most powerful methods for analyzing the scattering and diffraction problems of electromagnetic or acoustic waves. The essential step for the solution contains the so-called
factorization. This procedure needs to split certain analytic functions (kernels) into the multiplication form of two functions which have semi-infinite regions of regularity. In this paper, factorization of typical kernel functions which arise in the Wiener-Hopf equations concerned with dielectric objects, is discussed. By applying a general factorization theorem, exact integral representations of split functions are obtained and then some approximate formulas are derived via rigorous asymptotic procedure. As a result, it is pointed out that final approximate formulas are useful for high frequency range.
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Kenji Ohkuma, Miki Wadati
1984 Volume 53 Issue 9 Pages
2899-2907
Published: September 15, 1984
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The quantum three wave interaction models are introduced for three choices of statistics. The general Bethe states are constructed, and the existence of bound states is discussed for each model. It is concluded that the quantum three wave interaction models are completely integrable.
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Hideo Tsuru, Miki Wadati
1984 Volume 53 Issue 9 Pages
2908-2921
Published: September 15, 1984
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The Sine-Gordon equation is studied in detail. In particular, the properties of the multiple pole solution are investigated. It is found that the multiple pole solution describes a weak bound state of solitons and antisolitions. The scatterings among soliton, breather and the multiple pole solution are examined explicitly. Further, it is shown that the position shift analysis gives useful informations on the dynamics of particle-like waves.
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Shunji Kawamoto
1984 Volume 53 Issue 9 Pages
2922-2929
Published: September 15, 1984
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The classical Boussinesq equation is connected with the higher order water wave equation introduced by Kaup through a simple transformation. It is shown that similarity solutions of the two equations satisfy a special Riccati equation
g′=α
g2+βζ
g+γ transformed to the fourth Painlevé equation and several well-known linear ordinary differential equations, or
g′=α
g2+β
g+γζ to the second Painlevé equation and a few linear equations.
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Naobumi Honda, Harukazu Igarashi
1984 Volume 53 Issue 9 Pages
2930-2942
Published: September 15, 1984
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A full description of the previously proposed method of calculating low temperature specific heat and susceptibility of quantum spin chains are given. By the use of internal energy as the expansion variable the domain of convergence of the high temperature series is remarkably extended. The low temperature properties are obtained by continuing it in a natural way to polynomials in internal energy, whose form is suggested by the spin wave theory. The method is checked in the
S=1⁄2 XY model and is then applied to the Heisenberg model of
S=1⁄2, 1, 3/2 and 2. The results are satisfactory in ferromagnets and reasonable in the
S=1⁄2 antiferromagnet. In antiferromagnets of
S≥1 the results suggest inadequacy of our polynomial, which is, presumably, due to the existence of an energy gap.
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Fumihiko Takano, Hiroshi Takano
1984 Volume 53 Issue 9 Pages
2943-2955
Published: September 15, 1984
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The averaged eigenvalue spectrum of a large symmetric random matrix, in which each element is an independent random variable with the Gaussian distribution, is calculated by using the diagram technique. Compared with the methods used by Edwards and Jones and by Mehta, the present method is very simple and can be used in other calculations.
Leading terms in
N (the dimension of the matrix) and next leading terms are calculated exactly. It is shown that the term proportional to
N gives the semi-circular law obtained by Edwards and Jones. Next leading terms, which is of the order of unity, give three δ-functions as well as the corrections to the semi-circular law. One of the three δ-functions is the same as that of Edwards and Jones and other two are located at the band edges of the semi-circular law. The physical meanings of these results are discussed.
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Masahiko Sugawara, Yasuyuki Gono, Yoshinori Itoh
1984 Volume 53 Issue 9 Pages
2956-2965
Published: September 15, 1984
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Excited states in
217Ra were studied for the first time by the in-beam spectro-scopic techniques. Reactions used were
208Pb(
12C, 3n)
217Ra and
108Pb(
13C, 4n)
217Ra at 70 and 80 MeV, respectively. The γ-rays in
217Ra were identified based on the γ-ray excitation functions and the αγ-coincidence experiment. The level structure established in this study consists of three streched E2 cascades. Those states are interpreted to arise from the coupling of a valence neutron to the quadrupole- and octupole-phonon. An isomeric state with a half-life of 4.1±0.3 ns was found at 2388 keV with a spin-parity (31/2
−).
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Kenji Torizuka, Norio Morita, Tatsuo Yajima
1984 Volume 53 Issue 9 Pages
2966-2974
Published: September 15, 1984
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The dependence of the third harmonic intensity on the medium length under completely phase-matched and resonant conditions is discussed. It is shown that the conversion efficiency in the coherent transient case is expected to exceed that in the steady state case in a long and/or dense medium when the incident light pulse has sufficient energy. The 3S–5S transition of sodium with a 602.3 nm light is studied experimentally as a model system. The efficiency as a function of the incident light frequency and intensity is in agreement with the predictions. By eliminating the phase-mismatching effect, the dependence on the medium density is also determined. It is demonstrated that the efficiency surely increases even in the higher density of sodium.
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Hiromitsu Hamabata
1984 Volume 53 Issue 9 Pages
2975-2979
Published: September 15, 1984
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The effect of the presence of a magnetic field on the propagation of thermoconvective waves (TCW) in a horizontal layer of electrically conducting, viscoelastic liquid (Oldroyd’s liquid B) heated from below is investigated on the assumption that both layer surfaces are free. The presence of a magnetic field decreases (increases) the logarithmic decrement (the damping length) of TCW for supercritical Rayleigh numbers and increases the frequency above which the thermal waves propagate almost undamped, although the qualitative properties of TCW are hardly altered by the presence of a magnetic field.
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B. N. Mandal, S. K. Goswami
1984 Volume 53 Issue 9 Pages
2980-2987
Published: September 15, 1984
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The problem of the scattering of surface wave obliquely incident on a submerged fixed vertical plane barrier in deep water, is solved approximately by reducing it to the solution of an integral equation. The reflection and transmission coefficients are obtained approximately for different values of the angle of incidence and wave number, and represented graphically.
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Yoshihumi Kimura, Yoshiro Kusumoto, Hidenori Hasimoto
1984 Volume 53 Issue 9 Pages
2988-2995
Published: September 15, 1984
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Some particular solutions for motion of point vortices in a circular cylinder are presented. The solutions, which are available to any number of the vortices, correspond to symmetrical configurations with respect to the cylinder axis and exhibit regular periodic trajectries.
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Kenichi Nanbu
1984 Volume 53 Issue 9 Pages
2996-2999
Published: September 15, 1984
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It was shown in [J. Phys. Soc. Jpn.
52 (1983) 3382] that there are two theoretically sound simulation methods for solving the Boltzmann equation; one is Nanbu’s method and the other is Belotserkovskiy and Yanitskiy’s method. The only defect of these methods is in that the computation time is proportional to the square of the number of simulated molecules. Here is proposed an approximation the use of which makes the computation time directly proportional to the number of molecules. The essence of the approximation lies in using the collision probability in Nanbu’s method or the collision rate in Belotserkovskiy and Yanitskiy’s method averaged over local equilibrium distribution function. The error of the approximation is small over a wide range of the degree of nonequilibrium.
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Masao Doi, Izumi Yamamoto, Fumiaki Kano
1984 Volume 53 Issue 9 Pages
3000-3003
Published: September 15, 1984
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We report a result of Monte Carlo simulation for the Brownian motion of thin rodlike polymers in concentrated solution. It is found that: (i) the rotational motion is a diffusion process characterized by an effective diffusion constant
Dr; (ii) at high concentration,
Dr is proportional to
c−2 (
c being the number density of the polymer). This result is in agreement with the tube theory and is consistent with the experimental results of electric birefringence and dynamic light scattering.
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Masayoshi Taguchi
1984 Volume 53 Issue 9 Pages
3004-3009
Published: September 15, 1984
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The toroidal effect on the beam-induced current for an axisymmetric toroidal plasma is investigated by means of an expansion in \sqrtε (ε: inverse aspect ratio). An expression for the induced current is obtained up to the order of ε. This current is numerically calculated when the beam ions are monoenergetic and the beam velocity is much smaller than the electron thermal velecity. By use of results, an approximate expression for the induced current is derived as a function of ε and effective charge \bar
Z of the plasma.
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Hiroyuki Okada, Sadao Masamune, Hiroshi Nishihara
1984 Volume 53 Issue 9 Pages
3010-3017
Published: September 15, 1984
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We have investigated the behavior of neutral particles in a hydrogen plasma with a small tokamak NOVA-II by means of the H
α line intensity measurement. Our particular attention was paid to the contribution of the limiter to the recycling and the equilibrium balance of plasma particles. The H
α line intensity at the limiter was three times as strong as those at other positions. Transport of the neutrals injected by gas puffing in the toroidal direction was also investigated. No direct contribution of injected neutrals to the density distribution of neutral was observed at the position ±90° away from the gas injection valve in the toroidal direction.
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Naoto Kobayashi
1984 Volume 53 Issue 9 Pages
3018-3026
Published: September 15, 1984
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Atomistic calculations of activation energies of helium dissociation from helium-vacancy clusters in vanadium, niobium and molybdenum have been performed by a computer simulation method. In the process, formation energies of vacancy clusters, interstitial helium and helium-vacancy clusters have been also calculated as well as migration energies of vacancy and helium. Potentials of metal-metal and helium-metal for vanadium and molybdenum were after Johnson and Wilson, whereas other potentials were constructed in a similar manner. Calculated dissociation energies in vanadium and niobium are around 3.0 eV and smaller than those in molybdenum (4.0 eV to 5.0 eV). Large helium dissociation energies from small clusters suggest stable agglomeration states of helium in these bcc metals.
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Kozo Hoshino
1984 Volume 53 Issue 9 Pages
3027-3035
Published: September 15, 1984
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Theories of the excess energy, the Helmholtz free energy, the entropy and the partial and the total structure factors are described on the basis of the charged-hard-sphere model in the mean spherical approximation. In connection wth the charge ordering the important role of the excess entropy is emphasised in addition to that of the charge-charge correlation function.
The theories are applied to the liquid CsAu alloy. It is pointed out that the detailed studies of the partial structure factors and the entropy of mixing give the important information on the degree of the charge ordering in the system.
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Hiroaki Kamioka, Yoshio Sumino
1984 Volume 53 Issue 9 Pages
3036-3041
Published: September 15, 1984
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The sound velocity and its attenuation of three kinds of liquid tin-bismuth alloys, one eutectic composition of Bi/(Bi+Sn)=57.0 wt% and two hyper-eutectic compositions of Bi/(Bi+Sn)=63.5 and 66.7 wt%, were measured by the pulse transmission method over a range of temperatures extending from 139°C (eutectic temperature) to 190°C. The sound velocity of each liquid alloy shows the steady decrease with temperature in the measured temperature range, and the temperature coefficients of sound velocity in Bi
57.0Sn
43.0, Bi
63.5Sn
36.5 and Bi
66.7Sn
33.3, were −0.002, −0.589 and −0.660 m/s·deg at 170°C, respectively. By combining the present results with the previous data of density and thermal expansivity, the elastic and anelastic properties of liquid tin-bismuth alloys were reported, and discussion was made on the obtained results.
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Toyonori Munakata, Akito Igarashi
1984 Volume 53 Issue 9 Pages
3042-3045
Published: September 15, 1984
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Effects of interaction among the nonlinear Schroedinger solitons, neglected in our previous calculation of the lattice thermal expansion coefficient, are taken into account to obtain better agreement with the exact result.
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Yoshiyuki Matsumoto, Shin Akahoshi, Kenzi Hukuda
1984 Volume 53 Issue 9 Pages
3046-3051
Published: September 15, 1984
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Temperature dependence of
77Se hyperfine structure of SeO
43− radicals doped in KH
2(1−x)D
2xPO
4 is measured. It is found that the spectrum-splitting temperature
Tt for low-D crystal (
x\lesssim0.4) is nearly constant (160 K–170 K) and
Tt for high-D one (
x\gtrsim0.5) coincides with the respective Curie temperature. This D-dependence of
Tt is compatible approximately with the picture of D-independent bistable fluctuation of PO
4. But temperature dependence of the rate of bistable fluctuation of SeO
43− is found to depend on
x. This D-dependence is explained qualitatively by introducing interactions among the PO
4 dipoles mediated by the electric dipoles on the hydrogen bonds, effective moment of which depends on dynamical behavior of the hydrogen nuclei. It is pointed out that the present result is also compatible with both the local freeze-out model and the geometrical isotope effect.
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Masatsugu Suzuki, Rumiko Inada, Hironobu Ikeda, Sei-ichi Tanuma, Kunio ...
1984 Volume 53 Issue 9 Pages
3052-3059
Published: September 15, 1984
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The structural phase transition of stage 2 SbCl
5-graphite intercalation compound made from a single crystal of Kish graphite has been investigated by the electron diffraction, specific heat and static susceptibility below 300 K. The phase transition can be explained by the presence of two kinds of species for antimony chlorides. One of these species undergoes a commensurate-incommensurate phase transition at
Tcu (=230 K) of first order, and above
Tcu it forms a discommensuration structure in which the (\sqrt7×\sqrt7)R19.11° superlattice is modulated by the honeycomb domain structure. The other species remains unchanged as the (\sqrt7×\sqrt7)R19.11° structure at least above
Tc1 (=210 K). Below
Tc1, there appears the glassy phase which is identified as the (\sqrt7×\sqrt7) structure without directional long range order.
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Yukio Saito, Kazuhiro Igeta
1984 Volume 53 Issue 9 Pages
3060-3069
Published: September 15, 1984
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An antiferromagnetic Ising system on a triangular lattice is studied by means of a transfer matrix and the phenomenological scaling method. System consists of a semi-infinite strip and helical boundary conditions are imposed at the end of each row. At external magnetic fields
h=0 and 6
J, where
J is a nearest neighbor coupling constant, a unite residual entropy is obtained at the zero temperature. With a small field, specific heat is found to have two peaks; a high-temperature peak corresponding to the enhanced short-range order, and a low-temperature peak to the appearance of a long-range order. A phase diagram in
h−
T space is obtained by means of the phenomenological scaling, and agrees fairly well with the one obtained by Monte Carlo simulation. The main deficiency is the finite transition temperature at
h=0, which may be due to a crossover to the XY-like phase transition.
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Yutaka Okabe, Kaoru Ohno
1984 Volume 53 Issue 9 Pages
3070-3073
Published: September 15, 1984
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We have studied the susceptibility critical amplitude
Γ for the classical
n-vector model in the high-temperature expansion. With the help of the Pade approximant, we have shown the smooth and monotonic
n-dependence of the amplitude for the simple cubic, the body-centered cubic and the face-centered cubic lattices. The results are compared with the exact results for
n=∞.
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Kiyoshi Deguchi, Etsuo Okaue, Satoshi Ushio, Eiji Nakamura, Kohji Abe
1984 Volume 53 Issue 9 Pages
3074-3080
Published: September 15, 1984
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All of the components of the strain tensor
xi (
i=1, 2, 3 and 5) due to the temperature change have been measured for CsH
2PO
4 in a wide temperature range including the transition point. These strain components, except
x3, show anomalous temperature dependences which are hard to explain by the usual phenomenological theory. The quasi-one-dimensional Ising model by Carvalho and Salinas was extended to compressible cases. It is found that the extended model can give a quantitative explanation of the experimental results.
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Sigeo Ihara, Katsuo Suzuki
1984 Volume 53 Issue 9 Pages
3081-3087
Published: September 15, 1984
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Superionic conductor α-Ag
2S is simulated by the molecular dynamics with a simple ionic potential. The simulations are performed for two systems, one with 384 ions (128 S ions and 256 Ag ions) and the other with 1296 ions (432 S ions and 864 Ag ions). The simulated results show a characteristic feature of α-AgI type superionic conductor: anions form a bcc lattice and cations are mobile among interstitial sites. The temperature dependence of the tracer diffusion constant of Ag ions and the Debye-Wallar factor of S ions are in good agreement with experimentally observed ones. The velocity autocorrelation functions and the electrical conductivity are also obtained.
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Katsutoshi Iwahashi, Yoshiyuki Miwa, Yoshika Masuda
1984 Volume 53 Issue 9 Pages
3088-3094
Published: September 15, 1984
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Applying the spin wave theory to bcc solid 3He and taking into account interactions between spin waves, the free energy at finite temperatures, antiferromagnetic resonance frequency in the ordered phase and magnetic field strength where the transition from the uudd state to the pseudoferromagnetic state occurs, are calculated. If the exchange parameters are assumed to be
KP=
KF=−0.2471 mK and
jt=−0.1565 mK, large positive high temperature expansion coefficient
e3 determined from specific heat and pressure measurements by Fukuyama
et al. and Sawada
et al. can be explained. The temperature dependence of free energy between 0.3 and 0.7 mK determined by Osheroff
et al. is also explained as a combined effect of the interactions between spin waves and thermal excitations of spin waves with various wave lengths.
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Yoshihiro Hamauzu, Kaoru Masuda, Kazuyuki Hasegawa, Kimiyoshi Uchiyama ...
1984 Volume 53 Issue 9 Pages
3095-3100
Published: September 15, 1984
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Column matrix which describes the amplitudes of diffracted waves is expressed in the form of the resonane scattering plus the direct scattering. A new equation which determines the position of resonance is obtained from the resonance term. The present theory is applied to calculations of the intensity versus azimuthal angle spectrum for the system D/NaF(001). Intensity profiles of an isolated resonance is analyzed in detail.
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Tsuneya Ando
1984 Volume 53 Issue 9 Pages
3101-3111
Published: September 15, 1984
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A computer simulation is performed to study the problem of the Anderson localization in a two-dimensional electron system in strong magnetic fields. Scatterers with a long-range Gaussian potential are assumed and the localization criterion based on the Thouless number
g(
L) is employed. The states are shown to be exponentially localized except those in the vicinity of the center of the Landau level. Large statistical fluctuations inherent to the case of long-range scatterers prevent accurate determination of the detailed energy dependence of the inverse localization length. Response functions such as the Hall conductivity, the dynamical conductivity, and the lineshape of the cyclotron resonance are also calculated and compared with the results of the single-site approximation. The peak values of the diagonal conductivity are shown to be larger than the results calculated in the single-site approximation.
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Jiro Yamashita, Setsuro Asano
1984 Volume 53 Issue 9 Pages
3112-3119
Published: September 15, 1984
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The cohesive energy, the equilibrium lattice constant and the bulk modulus of NaF have been calculated by Löwdin’s method. The short range interactions between nearest neighbour ions and those between the nearest negative ions are taken into account. The theoretical values are in reasonable agreement with the observed values.
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Yoshiyuki Maeda, Noboru Miura, Makoto Sakata, Eiji Ohta
1984 Volume 53 Issue 9 Pages
3120-3125
Published: September 15, 1984
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Transverse magnetophonon resonance in
p-Te was investigated at various temperatures from 49 to 77 K in high pulsed magnetic fields up to 35 T. The small magnetophonon oscillations superposed on the large monotonic magnetoresistance could be observed by subtracting the monotonic part of the magnetoresistance. When the magnetic field parallel to the c-axis and the current perpendicular to the c-axis were applied, a new magnetophonon peak was observed around 22 T in the relatively high temperature range above 67 K. From consideration of the polarization and energy of the phonon modes, it was concluded that the E
h optical mode is responsible for the new peak around 22 T.
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Tsuneya Ando
1984 Volume 53 Issue 9 Pages
3126-3135
Published: September 15, 1984
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A computer simulation is performed to study localization in a two-dimensional electron system in strong magnetic fields. When scatterers only with attractive potentials are present and their concentration is not so high, the density of states is not symmetric around the center of each Landau level. The energy of delocalized states in this case is shown to be close to the energy where the real part of Green’s function vanishes except in the case of extremely low concentrations of scatterers. Effects of mixings between different Landau levels are also studied by including a finite number of Landau levels. It is shown that extended states remain to be present even if level mixings are important and that the energy for extended states is shifted to the higher energy side with the decrease of the strength of the magnetic field.
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Kimie Takusagawa
1984 Volume 53 Issue 9 Pages
3136-3137
Published: September 15, 1984
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It is shown that a stable domain boundary can exist in a system of coupled chains with incommensurate CDW. The boundary consists of solitons and anti-solitons arraying alternatively.
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Mitsuru Matsuura, Yuzo Shinozuka
1984 Volume 53 Issue 9 Pages
3138-3145
Published: September 15, 1984
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Variational calculations are performed to investigate the subband dependence of the ground (1
s type) and a few excited (2
s and 2
p type) states of a Wannier exciton in a quantum well. It is shown that (i) binding energies and oscillator strengths of excitons depend strongly not only on the width of the well but also on (electron and hole) subbands of the well with which excitons are associated and (ii) as the well changes from a thin well to a thick one, binding energies of most excitons for higher subbands do not change monotonically between two- and three-dimensional results.
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Masanori Sugahara, Masahiko Nagai, Nobuyuki Yoshikawa, Naoyuki Ando, Y ...
1984 Volume 53 Issue 9 Pages
3146-3152
Published: September 15, 1984
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A new macroscopic quantum effect with conjugate property to Josephson effect is proposed theoretically. Some experiments are given which reveal real existence of the effect.
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Hideoki Kadomatsu, Takanori Tsutaoka, Hiroshi Fujiwara
1984 Volume 53 Issue 9 Pages
3153-3159
Published: September 15, 1984
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The ac magnetic susceptibility, magnetization and electrical resistivity were measured for fcc Eu
xYb
1−x alloy (0≤
x≤0.4). The
x-temperature magnetic phase diagram was determined. Ferromagnetic state is observed for 0≤
x<0.29. The paramagnetic to ferromagnetic state transition temperature,
Tc, takes a maximum value, 31 K, near
x=0.12. The ferromagnetic to spin glass like state transition temperature,
Tt, suddenly appears at about
x=0.17 and the ferromagnetic region disappears at about 10 K and
x=0.29 (triple point). The paramagnetic to spin glass like state transition temperature,
Tg, shows almost no concentration dependence in 0.29<
x≤0.40. The spontaneous magnetization at 0 K obtained by an extrapolation holds the constant value, 7.6 μ
B/Eu atom, for
x\lesssim0.1, and decreases linearly as
x increases for
x\gtrsim0.1. In the electrical resistivity data, the transition from the semimetallic to semiconducting state as
x increases is found.
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Kenji Sumiyama, Tsutomu Yoshitake, Yoji Nakamura
1984 Volume 53 Issue 9 Pages
3160-3165
Published: September 15, 1984
Released on J-STAGE: May 29, 2007
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High concentration Fe
1−xCu
x alloys have been obtained by rf sputtering technique and investigated by X-ray diffraction and magnetization measurements. The bcc phase is extended over the region with
x=0–0.4, while the fcc phase with
x=0.6–1.0. For
x=0.4–0.6, we have the mixed phase of bcc and fcc. The lattice constant of bcc phase increases slightly and that of fcc phase decreases with increasing
x. In the bcc alloys, the average magnetic moment decreases with increasing
x and deviates upwards from the simple dilution law. In the fcc alloys, the magnetic moment also decreases with increasing
x but it deviates downwards from the simple dilution law. The Curie temperature,
Tc, of the Fe
1−xCu
x alloys decreases abruptly with increasing
x:
Tc is higher than 750 K for the bcc alloys, while it is lower than 320 K for the fcc alloys and become 0 K at about
x=0.92.
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Keiko Katoh, Kazuko Motizuki
1984 Volume 53 Issue 9 Pages
3166-3171
Published: September 15, 1984
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The magneto-volume effects of intermetallic compounds MnAs and MnAs
1−xP
x are studied from the viewpoint of itinerant electrons. Using the free energy obtained by the spin fluctuation theory we calculate the pressure as a function of temperature, from which the spontaneous volume magnetostriction is obtained. We have made calculations for the paramagnetic and ferromagnetic states of the NiAs-type structure and for the paramagnetic state of the MnP-type structure. The observed anomalous temperature dependence of the volume in the intermediate phase of the MnP-type structure and a discontinuous volume change at the Curie temperature are well explained by the effects of spin fluctuations.
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Noriaki Hamada
1984 Volume 53 Issue 9 Pages
3172-3182
Published: September 15, 1984
Released on J-STAGE: June 01, 2007
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A method of calculating local and nonlocal susceptibilities including exchange enhancement is presented on the basis of an effective-medium (HF-cluster-CPA) theory which was developed by Miwa and the present author. Those susceptibilities make clear characters of an atomic magnetic moment. Actual calculations are performed for Fe–V and Ni–Cu alloys. In the vicinity of the ferromagnetic critical concentrations of these alloys, Ni atomic moment with many Ni neighbors is extremely sensitive to the magnetization not only of the first-nearest-neighbor shell but also of the farther shells, while Fe atomic moment can be affected only by the magnetization of the first-nearest-neighbor shell.
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Takeo Jo, Kunitomo Hirai
1984 Volume 53 Issue 9 Pages
3183-3190
Published: September 15, 1984
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Relative stabilities among various multiple spin density wave (MSDW) states specified by equivalent wave vectors are discussed on the basis of symmetry considerations for the first-, the second- and the third-kind antiferromagnetic structures in the fcc lattice. The energy of the MSDW state is expressed as the expansion with respect to normalized amplitudes for constituent single-
Q states. The degeneracy among MSDW states, which is not lifted in the Heisenberg model, is shown to be removed by more than or equal to the fourth-order perturbation with respect to transfer integrals between atoms. Within the lowest order expression to remove the degeneracy, possible stable structures are discussed. The effect of higher order perturbations and the prospect to determine the most stable MSDW state in transition metals with the first-kind ordering are also discussed.
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Yûichi Tazuke, Hidekazu Tanaka, Katsunori Iio, Kazukiyo Nagata
1984 Volume 53 Issue 9 Pages
3191-3197
Published: September 15, 1984
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Magnetic susceptibility studies are made in 4.2 K≤
T≤573 K on single crystals of linear chain Heisenberg antiferromagnets CsCrCl
3 and RbCrCl
3. Anomalies in the temperature variation of the susceptibility are observed at temperatures where crystallographic phase transitions caused by cooperative Jahn-Teller effect take place. The anomaly is a discontinuous jump or a turning point according as the transition is of first or second order, respectively. The data are fitted to Fisher’s classical theory, and temperature variations of the intrachain exchange interaction constants of the two magnets are evaluated. The constant changes discontinously at the first order transition temperature, and continuously in a temperature range below the second order transition temperature.
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Yoshihiro Yamada, Yoshio Kitaoka, Kunisuke Asayama, Akihiko Sakata
1984 Volume 53 Issue 9 Pages
3198-3209
Published: September 15, 1984
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Pulsed NMR investigations of
93Nb have been performed in the hexagonal Laves phase intermetallic compound (Zr
1−xNb
x)Fe
2 with 0.8≤
x≤1.0. From the measurements of the Knight shift and the nuclear spin-lattice relaxation time
T1, it is demonstrated that NbFe
2 is a nearly ferromagnetic compound and (Zr
1−xNb
x)Fe
2 with
x=0.95 and 0.85 are weakly ferromagnetic compounds having a Curie temperature of 30 K and 40 K, respectively, in contrast with the itinerant electron antiferromagnetism for 0.5≤
x≤0.7. In the composition of
x=0.8 where the antiferromagnetic order occurs below 85 K and ferromagnetic moment appears below 30 K, it was found out from
T1 measurement that the system is in a coexistent state of ferro- and antiferromagnetism.
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Shigeru Takagi, Hiroshi Yasuoka, J. L. Smith, C. Y. Huang
1984 Volume 53 Issue 9 Pages
3210-3219
Published: September 15, 1984
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The microscopic magnetic properties of an itinerant electron paramagnet TiBe
2 have been investigated by Ti and Be NMR at temperatures from 1.4 to 280 K. The Knight shift
K of the Ti resonance was found to be linear in the susceptibility χ, while the temperature and the external field dependences of the Be resonance spectrum could be explained consistently from the combined effect of anisotropic hyperfine and electric quadrupole interactions. From the analysis of the Knight shift and the nuclear spin-lattice relaxation time
T1 of Be at low temperatures, it is shown that only the long-wave components of spin fluctuations are strongly exchange-enhanced and play a predominant role. It is also shown that although the spin contribution to 1⁄
T1 varies above about 40 K as χ
spinT in accord with a theoretical calculation for weakly or nearly ferromagnetic metals, deviation from the above relation is quite marked at lower temperatures.
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Kohji Abe, Eiji Nakamura, Satoshi Ushio
1984 Volume 53 Issue 9 Pages
3220-3226
Published: September 15, 1984
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The
D-
E hysteresis loops have been observed between 10
−2 Hz and 60 Hz for lossy KH
2PO
4 crystals with different dielectric losses at room temperature. The coercive fields of these crystals show maxima at the same temperature
Tp characteristic of the frequency of the applied field. In a certain temperature region below
Tp the coercive field increases with decreasing the frequency of the applied field. It turns out that these anomalous temperature and frequency dependences of the coercive field are closely related with the formation of the internal bias field due to the locally relaxing defect.
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Osamu Taniguchi, Masaharu Tokunaga, Masaru Kasahara, Itaru Tatsuzaki
1984 Volume 53 Issue 9 Pages
3227-3233
Published: September 15, 1984
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Angular dependence in the
a*c plane of Brillouin scattering spectra in SnCl
2·2H
2O has been studied over a temperature range through the isomorphous phase transition temperature
Tc=−53.8°C. Temperature dependence of elastic stiffness constants
c11,
c13,
c15,
c33,
c35 and
c55 has been obtained. Anomalies of
c13 and
c33 have been found at
Tc. A phenomenological discussion is presented in order to explain these anomalies in connection with the layered structure.
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