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L. Hlavatý
1986 Volume 55 Issue 5 Pages
1405-1406
Published: May 15, 1986
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The results of Painlevé analysis of a non-autonomous KdV equation are presented. It is shown that the equations that have the Painlevé property are transformable to the standard KdV.
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Yasuo Morimoto
1986 Volume 55 Issue 5 Pages
1407-1410
Published: May 15, 1986
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Transition phenomena are studied numerically in forced van der Pol oscillator which have not been predicted theoretically. Let the external force be Ecosνt. Theoretically there is a critical value of
E(
E3). For
E>
E3 fundamental oscillation and for
E<
E3 quasi-periodic or harmonic oscillation take place. However numerical studies reveal that different regions appear even for
E<
E3 depending on whether self-sustained oscillation or the external force is dominant. The decay time of the distance between two orbits shows slowing down expressed as (
E−
E3)
−0.75 for
E>
E3.
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Takato Hirayama, Kazutaka Oda, Youji Morikawa, Tetsuo Ono, Yoshikazu I ...
1986 Volume 55 Issue 5 Pages
1411-1414
Published: May 15, 1986
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Cross sections for single and double ionization of K
+ and Na
+ by electron impact have been measured as a function of electron energy from their respective threshold to approximately 1500 eV with the use of the electron-ion crossed-beam technique. The results for single ionization of Na
+ and K
+ are in good agreement with the previous crossed-beam data within the experimental uncertainties. Contributions from an autoionization and an L-shell direct ionization followed by autoionization (Auger effect) have been found in the results of single and double ionization cross sections for K
+.
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Tadashi Okada, Hiroyuki Wakayama, Hajime Kasahara, Keiichi Yamamoto
1986 Volume 55 Issue 5 Pages
1415-1417
Published: May 15, 1986
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The crystallization produced by isochronal annealing of evaporated Ge film is analyzed by using Raman spectroscopy. A volume fraction of crystallinity is deduced from the Raman spectrum and is then substituted into the modified Avrami formula. From the analysis, an activation energy for the incipient stage of crystallization is found to be 0.13 eV, which agrees with the activation energy for viscous flow of Ge. The present result is consistent with the result of Si film.
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Kazuo Ueda, Takeo Fujiwara, Hirokazu Tsunetsugu, Tetsuji Tokihiro
1986 Volume 55 Issue 5 Pages
1418-1419
Published: May 15, 1986
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Recent NMR measurements by Yasuoka
et al. report unusual properties of quasicrystalline Al
4Mn,
e.g. a diverging peak at
K=0 in the NMR spin-echo spectrum. We propose a new mechanism that the critical nature of wavefunctions in quasicrystals is responsible for these unusual behaviors.
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Hirokazu Tsunetsugu, Takeo Fujiwara, Kazuo Ueda, Tetsuji Tokihiro
1986 Volume 55 Issue 5 Pages
1420-1423
Published: May 15, 1986
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We find a systematic procedure constructing the 2D and 3D “
periodic” Penrose tilings, which tend to the infinite Penrose tilings. The electronic states in the 2D Penrose tiling are studied by using this sequence. We observe that the spectral measure is singular continuous in the limit of the infinite size. Most of eigenstates are critical, i.e. neither extended nor localized.
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Kunihiko Yamaji
1986 Volume 55 Issue 5 Pages
1424-1427
Published: May 15, 1986
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The transverse magnetoresistance of quasi 1D conductors is shown to have a new effect of the title not originating in the orbital quantization like the Shubnikov-de Haas effect. The model band energy is a symplified version of Gor’kov-Leded’s model. The eigen energy and wave function in the transverse magnetic field are obtained in the normal state and also in a SDW state. By a variational method the magnetoresistance is calculated for typical processes including the electron-phonon and Umklapp Coulomb scatterings in the normal and SDW states. The matrix elements for these processes are oscillatory due to interference of the incoming and outgoing electron waves modified by the field. The small-period oscillation observed in the magnetoresistance of the Bechgaard salts is ascribed to this new mechanism working with the electron-phonon interaction in the SDW state.
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Wataru Kinase, I. P. Zvyagin
1986 Volume 55 Issue 5 Pages
1428-1429
Published: May 15, 1986
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An exponential thickness dependence of the conductivity along a thin granular ceramic or polycrystalline film is predicted. This size effect results from the random fluctuation of inter-grain barrier heights and is shown to hold for film thicknesses much greater than the characteristic grain size.
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Takahito Kaneyoshi
1986 Volume 55 Issue 5 Pages
1430-1433
Published: May 15, 1986
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The role of the fluctuation of exchange interactions in a disordered binary ferrimagnetic alloy is investigated. It is proposed that a number of interesting phenomena due to the so called frustration of exchange bonds, such as the possibility of reentrant ferrimagnetic phase, may appear in a new amorphous ferrimagnetic alloy, although at the present time the main interest of experimentalists is directed to obtain an amorphous ferrimagnetic alloy which has a compensation point in the vicinity of room temperature, because of its potential device applications.
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Junji Iida, Yasuaki Nakagawa, Noboru Kimizuka
1986 Volume 55 Issue 5 Pages
1434-1437
Published: May 15, 1986
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It has been found in hexagonal LuFe
2O
4 that the magnetization measured after heating to a temperature in a constant magnetic field is much larger than that measured by the application of the same field after heating to the same temperature in zero field. This is called the ‘field heating effect’ in contrast to the so-called field cooling effect. This phenomenon suggests the existence of a phase transition. Although the direct evidence of the phase transition has not been obtained yet, it may probably be related to the ordering of Fe
2+ and Fe
3+ ions.
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Fumitaka Matsubara, Sakari Inawashiro
1986 Volume 55 Issue 5 Pages
1438-1441
Published: May 15, 1986
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A quasi-two-dimensional antiferromagnetic Ising model on a hexagonal close-packed lattice is analyzed theoretically and studied by a Monte Carlo method. As the temperature is decreased, a two-dimensional paramagnetic (2DP) phase, a three-dimensional paramagnetic (3DP) phase, where short range orders of spins with incommensurate periods extensively develop, and a non-periodic freezed (NPF) phase occur successively. The appearance of the NPF phase is attributed to an effect of a weak interlayer exchange interaction. We believe that our results explain recent experiments on LiNiO
2 performed by Hirakawa
et al.
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Kin’ya Takahashi
1986 Volume 55 Issue 5 Pages
1443-1457
Published: May 15, 1986
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Time development of quantum wave packet is studied in the Hisumi representation for regular and irregular case. The Husimi distribution function spreads on tori or into irregular region for regular or irregular case, respectively and coincides to classical probability distribution function. However by the quantum mechanical interference effects, small packets appear in the process of time development and thus the Husimi distribution function distributes inhomogeneously in contrast to the classical uniform probability distribution function. These small packets are shown to be more stable than classical one.
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Kiyomi Okamoto, Hidetoshi Nishimori, Yoshihiro Taguchi
1986 Volume 55 Issue 5 Pages
1458-1465
Published: May 15, 1986
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We numerically caculate the exact ground state energy
E0(
N, δ) and the first excited state energy
E1(
N, δ) of the one-dimensional spin-1/2 alternating antiferromagnetic Heisenberg model
(
Remark: Graphics omitted.),
J>0, 0≤δ<1,
for
N=8, 10, …, 20 with
N being the number of spins. We employ the finite-size scaling method to determine the critical exponents
a,
b and ν of the energy gain by alternation, the energy gap and the correlation length as defined by
(
Remark: Graphics omitted.),
and ξ∼δ
−ν (ξ is the correlation length), respectively. The estimated values are
a=1.37±0.09,
b=0.79±0.06, ν=0.75±0.06. We also analytically calculate ξ and ν by the use of the phase Hamiltonian method for comparison with our numerical result.
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Yasuhiro Akutsu, Atsuo Kuniba, Miki Wadati
1986 Volume 55 Issue 5 Pages
1466-1474
Published: May 15, 1986
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Multi-state generalization, which is applicable to arbitrary IRF model, is presented. The generalization is made in such a way that each spin is replaced by an
SN-symmetric multiplet. If the original IRF model is exactly solvable satisfying the star-triangle equation, so is the generalized one. A simple symmetry-breaking procedure is also presented. In the special case
N=2, another kind of generalization is proposed and an exactly solvable 4-state model with
S2-symmetry between the highest spins is newly constructed.
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Toshihico Arimitsu, Hiroomi Umezawa
1986 Volume 55 Issue 5 Pages
1475-1492
Published: May 15, 1986
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A fundamental framework of thermo field dynamics (TFD), including non-equilibrium situations as well as equilibrium stuations, is formulated through a compact axiomatic form, in which no reference to reservoirs is needed, by considering quantum fields. The semi-free quantum fields in TFD are constructed in a way parallel to that of the usual quantum field theory without thermal degrees of freedom, i.e. in terms of orthonormalization relations among wave functions, the sum rule for wave functions, the divisor operator and the particle-antiparticle conjugation (C-conjugation).
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H. Ahrar, S. Ahmad, M. Zafar, M. Shafi
1986 Volume 55 Issue 5 Pages
1493-1503
Published: May 15, 1986
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In the present work we report some new data on charged particle multiplicity and pseudorapidity distributions of shower particles produced in pion-emulsion collisions at 340 GeV/c. Some of the results are compared with the data from proton-nucleus interactions at 400 GeV/c. From the study of pseudorapidity distributions of charged shower particles, it is noticed that the maxima of η-distributions shifts towards smaller values of η with increasing
ng. Bi-modality in the η-distributions is observed for all
ng-intervals at 340 GeV/c. There is no tendency of appreciable change in the dispersions of η-distributions with increasing
ns,
ng or
Nh, except in the region of small values of
ng and
Nh. Forward-backward correlation has also been investigated.
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Kazuhiko Okuno
1986 Volume 55 Issue 5 Pages
1504-1515
Published: May 15, 1986
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By an
octo
pole
ion-beam
guide (
OPIG) technique combined with a tandem mass spectrometer technique, one- and two-electron capture cross sections of Ar
2+ and Kr
2+ in their own gases have been measured in the wide collision energy range from 0.1 to 1000 eV (in center-of-mass systems). By changing electron impact energy to produce incident ions, contributions to cross sections from various ionic states in beams are examined. Two-electron capture cross sections are almost independent of ionic states, but one-electron capture cross sections depend strongly on ionic states. One-electron capture cross sections by
3P state are determined at collision energies of 1.0, 10 and 100 eV. In this paper, it is also shown that this
OPIG experiment is very useful for low energy collision experiments and spans well the energy gap in previous experiments.
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Masahiro Nakagawa, Tadashi Akahane
1986 Volume 55 Issue 5 Pages
1516-1522
Published: May 15, 1986
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The effect of the polarization field on the elastic deformation in chiral smectic C liquid crystals is presented. In this work, a 180° twisted sample of chiral smectic C liquid crystal is concerned and the polarization field induced by the spontaneous polarization is consistently taken into account as well as an externally applied electric field. It is found that the effect of the polarization field must not be neglected to study such deformation of chiral smectic C liquid crystals when there exists the polarization charge induced by the spontaneous polarization.
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Yoshinori Yamamoto
1986 Volume 55 Issue 5 Pages
1523-1527
Published: May 15, 1986
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An equation for finite amplitude waves in liquids with constant depth is presented, taking the effect of higher order dispersion into account. Exact solutions of this equation are given by elliptic and hyperbolic functions.
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Kiyosi Horiuti
1986 Volume 55 Issue 5 Pages
1528-1541
Published: May 15, 1986
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Transition in plane channel flow is numerically studied. The initial condition for the velocity field is given as a superposition of random fluctuations on the mean velocity. Cyclic boundary conditions are imposed for the velocity and pressure in the downstream and spanwise directions. The no-slip boundary condition is imposed on the walls. Computations are carried out both with and without subgrid scale (SGS) modeling, and the major objective of the present paper is the comparison between them. Consequently, two modes of transition from laminar to turbulent are shown depending on the Reynolds number and the amplitude of disturbances. Horse-shoe type vortices observed in experiments are reproduced numerically, and their detailed structure is investigated.
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Shigeo Kida
1986 Volume 55 Issue 5 Pages
1542-1555
Published: May 15, 1986
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A filtered spectral method is proposed for the study of the distribution in the complex-space of singularities of solutions to partial differential equations. It is applied to the Burgers equation to trace the motion in the complex-space of the singularities close to the real axis in the processes of shock-formation and collision of two shocks.
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Takeo Soga
1986 Volume 55 Issue 5 Pages
1556-1567
Published: May 15, 1986
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Unsteady evaporation from liquid surface was studied based upon a linearized kinetic model equation which yielded the thirteen moments correct. The kinetic model equation was reduced to a steady state equation with the aid of Laplace transformation and the resultant equation was solved, using the half-range Hermite polynomials. A quasisteady solution as
t→∞ was obtained for a constant liquid temperature. The results showed a good agreement with the ones derived from a thermodynamic consideration. For descending (or ascending for condensation) liquid temperature the variation in the temperature in the vapor phase induced a retardation of vapor motion and consequently no quasi-steady evaporation took place in this case. The results indicated that the presure controlled evaporation reduced to the heat flux controlled evaporation as the time elapsed.
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Yasunaga Suzuki, Rikizo Hatakeyama, Noriyoshi Sato
1986 Volume 55 Issue 5 Pages
1568-1573
Published: May 15, 1986
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In a collisionless supersonic plasma flow passing through a magnetic well along the field lines, a depression of plasma potential is observed to form around the magnetic well. The depression depth is of an order of
Te/e (
Te: electron temperature, −e: electron charge). There appears a transition from depressed to hilled profile as neutral-gas pressure is increased, being ascribed to mirror trapping of ions due to the collisions. A further increase of the gas pressure results in a formation of MHD-flow potential profile. A plasma potential profile along a magnetic hill shows an asymmetric hilled shape which disappears with an increase in the gas pressure.
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Mitsuru Yamagiwa
1986 Volume 55 Issue 5 Pages
1574-1589
Published: May 15, 1986
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The instability due to anisotropy of the electron tail temperatures during lower-hybrid current rise is investigated. Tail formation by lower-hybrid waves is studied by using a Fokker-Planck equation combined with the return field and the rf-associated terms. Quasi-linear relaxation of the electron tail distibution under the influence of the plasma waves excited by the instability is examined. It is found that the instability condition is related to the diffusion coefficient due to lower-hybrid waves, and that the decrease in the toroidal magnetic field can lead to the instability. The time scale between the instability spikes can be explained by that for the flat tail formation by lower-hybrid waves. The suppression of the instability by electron cyclotron heating is also studied. It is confirmed that the mechanism of the suppression is the enhancement of the perpendicular electron temperature.
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Akira Sugiyama
1986 Volume 55 Issue 5 Pages
1590-1600
Published: May 15, 1986
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Interplanar interactions between the hexagonal net planes in close-packed metals are discussed as a function of the electron-atom ratio 〈e⁄a〉 on the same model that Blandin
et al. used. Now the expansions are done to second order, whereas those by Blandin
et al. are only to first. The second order asymptotic expansions show that the anomaly in the interplanar interactions at 〈e⁄a〉≈1.140, found by Blandin
et al., disappears. These expansions are applied to evaluate approximate values of the stacking fault energy, γ
SF, and the difference
ΔUHF in the binding energies between HCP and FCC lattices. Comparisons of these values with those accurately calculated show that the second order expansion is a good approximation. The approximate relation γ
SF≈2
NpΔUHF holds in 〈e⁄a〉=1.0∼1.2, where
Np is the density of lattice points on the net plane.
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Ryusuke Nishitani, Kei Suda, Hiroyoshi Suematsu
1986 Volume 55 Issue 5 Pages
1601-1612
Published: May 15, 1986
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The stacking order of graphite and K-layers in K-graphite intercalation compounds (GIC) has been studied by
in situ X-ray diffraction measurements. The stacking sequence of graphite layers for stage
n=2−8 is described as |(
AB)
n⁄2|(
BC)
n⁄2|(
CA)
n⁄2| for even-numbered stage, and |
A(
BA)
(n−1)⁄2|
A(
CA)
(n−1)⁄2| for odd-numbered stage, where the vertical line denotes a K-layer, and
A,
B and
C the stackings of graphite layers. The long range ordering of the stacking sequence can be interpreted by a stacking change model for stage transition. Stacking faults, which are remarkable in stage 2, can be understood as a consequence of stage transition in the proposed model. Two solid phases of different K-layer stackings, αβ and αβγδ, have been observed in stage 1 at elevated temperatures.
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Terutaka Goto, Akira Tamaki, Tadao Fujimura, Hiromi Unoki
1986 Volume 55 Issue 5 Pages
1613-1623
Published: May 15, 1986
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Elastic properties of holmium vanadate, HoVO
4, have been investigated by means of an ultrasonic method. The elastic constants
C11, (
C11−
C12)⁄2 and
C66 exhibited remarkable softenings possessing minimum points around 13.5 K, which are characterized by the quadrupolar responses for the singlet ground state system. Appling magnetic fields along the tetragonal
c-axis, the elastic anomalies of (
C11−
C12)⁄2 and
C66 associated with the level crossing of the singlet ground state at about 10.6 T have been found. The rotational invariance effect has been revealed in the
C44 mode under magnetic fields along
c-axis.
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Fujinobu Nakamura, Mitsuo Chikasaki, Jin-ichi Takamura, Shozo Takeno
1986 Volume 55 Issue 5 Pages
1624-1635
Published: May 15, 1986
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The vibrational contribution to the binding entropy between a vacancy and a solute atom is investigated in the high temperature harmonic approximation. An exact formal expression is derived by the use of the Green’s function method and applied to simple model lattices. The formal result reveals that the vibrational entropy change is expressed by the sum of two terms: a mass dependent term, which is not affected by the spatial configuration of defects; and a force-constant dependent term, so that the entropy change on association of defects such as vacancy-solute binding depends only on force constants around the complex but not on the mass. The general feature of the binding entropy between a vacancy and a solute atom is deduced from the numerical calculation of the formal expression for a simple cubic lattice with the nearest neighbour force interaction, and is compared with experimental results.
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Kiyosi Motida
1986 Volume 55 Issue 5 Pages
1636-1649
Published: May 15, 1986
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A lattice dynamical model is constructed for the NaCl type alkali halide crystals by incorporating the covalency effects in the framework of Hardy’s polarization dipole model. Three effects of covalency are taken into account: (1) the reduction of the effective charge of the long range Coulomb interaction between ions from the formal charge of ion, (2) the attractive force due to covalency, and (3) the field induced charge flow. The model is found to provide a closer description of the dispersion curves than the deformation dipole model that is obtained by incorporating the mechanical polarization effects in the framework of the polarization dipole model.
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Akio Yamanaka, Itaru Tatsuzaki
1986 Volume 55 Issue 5 Pages
1650-1655
Published: May 15, 1986
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Uniaxial stress effect on optic modes in squaric acid was studies by Raman scattering. The out-of-plane librational modes (Bg species lines near 150 cm
−1) and the translational mode (Bg species line at 158 cm
−1) are found to be sensitive to a uniaxial stress applied along the
b axis, but the in-plane librational mode (Ag species line at 238 cm
−1) and several internal modes are not. These results are discussed in relation to the two dimensional character of the layered structure of the compound.
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Yoshiyuki Ono, Akira Terai, Yasushi Wada
1986 Volume 55 Issue 5 Pages
1656-1662
Published: May 15, 1986
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The eigenvalue problem for phonons around a soliton in a continuum model of trans-polyacetylene t-(CH)
x, the so-called TLM model, is reinvestigated using a kernel which satisfies the correct boundary condition. The three localized modes are reproduced, two with even parity and one with odd parity. The phase shift analysis of the extended modes confirms their existence if one-dimensional version of Levinson’s theorem is applicable to the present problem. It is found that the phase shifts of even and odd modes differ from each other in the long wave length limit. Our previous conclusion that the scattering of phonons by the soliton is reflectionless has to be modified in this limit, where phonons suffer reflection from the soliton.
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Kêitsiro Aizu
1986 Volume 55 Issue 5 Pages
1663-1670
Published: May 15, 1986
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The order parameter
Q(
x) for incommensurate transitions can, as is well known, be expressed as a sum of harmonics
Qn e
inhx, where
n takes on integers. Let α, the degree of anisotropy of the free energy function, have
t divisors α
1(=α)>α
2>…>α
t−1>α
t(=1). Then,
t different types of incommensurate phases can be conceived, the
jth of which has
Qns≠0 for and only for
n=1+α
jν (ν=0, ±1, ±2, …). The
j=1 type is ordinarily incommensurate. The
j=
t type is essentially the same as recently termed semicommensurate. The 2≤
j≤
t−1 types are new proposals; they can be recognized as twofold incommensurate (while the
j=1 type as onefold incommensurate). Transitions involving twofold incommensurate phases are possible. A detailed account of this possibility is given.
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Satoshi Takada, Kenn Kubo
1986 Volume 55 Issue 5 Pages
1671-1686
Published: May 15, 1986
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The
SxSx correlation function of
S=1⁄2 XXZ chain is numericaly obtained at low temperatures by means of the transfer matrix with use of the Trotter approximation.
The inplane susceptibility and the correlation length are extrapolated to
N=∞ where
N is the number of the Trotter slicings. It is shown that the extrapolation works quite effectively and makes the estimation of the critical indices ν, γ and η possible for the anisotropy parameter −0.75≤
Δ≤0.5. The obtained values of ν, γ and η satisfy the scaling relation and agree quite well with the analytic expression derived by Luther and Peschel.
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Hidehiko Sugimoto
1986 Volume 55 Issue 5 Pages
1687-1694
Published: May 15, 1986
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The jump rate of light interstitials between neighboring sites with energy difference is examined on the basis of Kondo’s theory which takes account of the non-adiabatic response of conduction electrons to the motion of interstitials. The average of the jump rate is calculated by adopting simple models for the energy distribution and the occupation probability of sites.
It is found that the average jump rate at low temperatures becomes constant when the occupation probability of sites is independent of their energies, whereas it decreases with decreasing temperature when thermal equilibrium can be attained.
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Sigeo Ihara, Katsuo Suzuki
1986 Volume 55 Issue 5 Pages
1695-1702
Published: May 15, 1986
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Using the Monte Carlo simulation technique, the correlated diffusion through tetrahedrally coordinated 12(d) sites in the bcc lattice is studied in the framework of the lattice gas model, where the particles interact with the nearest-neighbor repulsion and diffuse via particle-vacancy exchange. The tracer correlation factor, the charge correlation factor, and the Haven ratio are obtained as a function of the particle concentration and the temperature. The particle concentration dependence of the Haven ratio is qualitatively consistent with that of the experimental and molecular dynamics studies of α-AgI type superionic conductors.
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Shinpei Fujii, Akio Kodama, Yukio Mizuno
1986 Volume 55 Issue 5 Pages
1703-1708
Published: May 15, 1986
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The electronic ground state of the MgO crystal is studied on the basis of the Heitler-London picture. The electron density in momentum space is calculated by using the 2nd-order cluster approximation mentioned in the preceding paper of this series. In the present study two extremes are chosen from available wavefunctions of the O
2− ion, all now available ones having the free ion-like symmetry
1S. It is shown quantitatively that neither of the obtained electron-momentum densities is consistent with both of the observed isotropic Compton profile and cohesive energy. The present results indicate that the difficulty will be removed by adopting non-spherically distorted wavefunctions for O
2−.
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Kazuo Soda, Tamiko Mori, Masaki Taniguchi, Seiji Asaoka, Kenzo Naito, ...
1986 Volume 55 Issue 5 Pages
1709-1715
Published: May 15, 1986
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The energy distribution of the 4
f partial density of states in CeCu
6 has been observed by means of the resonant enhancement of the 4
f cross section associated with the excitation of the 4
d electron. The main 4
f line is located 2.3 eV below the Fermi edge. In addition to the main line, states with the 4
f character are distributed all over the valence band. The 3
p−3
d resonances of the Cu 3
d band and its satellite are also found.
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Kenji Shiraishi, Hiroshi Kamimura
1986 Volume 55 Issue 5 Pages
1716-1727
Published: May 15, 1986
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In this paper we consider a new type of metal-semiconductor superlattices and try to clarify the features of its electronic structure. As a first example we choose Si–Al superlattice and calculate its electronic structure by the first principles LDF methods self-consistently. The result predicts the two kinds of Fermi surface; one has two dimensional character and is associated with the interface states, while the other has three dimensional character and is associated with the bulk states. The calculated charge density shows the formation of covalent bonds between Si and Al atoms in the interface region and this formation of covalent bonds results in the energy gain in the cohesive energy and is expected to compensate the energy loss due to the expansion of lattice constant in Al layers.
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Toshio Soda
1986 Volume 55 Issue 5 Pages
1728-1740
Published: May 15, 1986
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We explain the extremely large effective masses of
f electrons of heavy fermion systems, from the values of the bandwidths of the
f electrons and the
s conduction electrons obtained by the band calculation. The interaction of
f electrons intermediated by the
s conduction electrons of a lighter mass is adopted to make the attractive interaction appear for superconductivity, and the partial wave decomposition of the interaction including the screened Coulomb repulsion between
f electrons is shown to explain the predominance of
s or
p wave superconductivity depending on the ratio of fermi wave vectors of the
f and the
s electrons.
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Norimichi Kojyo
1986 Volume 55 Issue 5 Pages
1741-1750
Published: May 15, 1986
Released on J-STAGE: June 01, 2007
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A method, which incorporates the effects of long-range fluctuations into a single three-spin custer, is presented. The basic idea is to consider overlapping clusters in a chain, in order to equally treat all neighboring three spins and also to take account of the long-range correlations beyond the cluster size. An approximate decimation is employed, by which all spins of the chain are successively decimated and a renormalized three-spin cluster is obtained. Numerical calculations of the internal energies and the specific heats for spin 1/2 systems are presented, and show that the present approximation is valid for (
Remark: Graphics omitted.).
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Yoshihiro Yamada, Akihiko Sakata
1986 Volume 55 Issue 5 Pages
1751-1758
Published: May 15, 1986
Released on J-STAGE: June 01, 2007
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An analysis method of antiferromagnetic powder patterns in spin-echo NMR under external fields is shown. Spin-echo spectra for powdered antiferromagnets under external fields have been calculated in both the field- and frequency-sweeping cases on the assumption of the random distribution of the direction of antiferromagnetic internal fields. In this calculation, the effect of the non-perpendicularity between the axis of the sample coil and the resonance field is taken into account. From the comparison with the observed spectra which have been measured for proton in the antiferromagnetic CsMnCl
3·2H
2O in the powdered state, the present analysis method is shown to be applicable to the analysis of the spectra of real antiferromagnetic materials.
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Masashi Ban, Toshihico Arimitsu
1986 Volume 55 Issue 5 Pages
1759-1777
Published: May 15, 1986
Released on J-STAGE: June 01, 2007
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A model of optical dephasing is proposed, which consists of two-level (or multilevel) electronic system, matter system and their environment which is considered as a thermal reservoir. This model is investigated with two-pulse excitation. It is found that, in the case of the strong coupling between the electronic system and the matter system, the matter system behaves like a dynamical system which causes photon echo, whereas, in the case of the weak coupling, it behaves like a thermal reservoir.
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Kenji Takanaka
1986 Volume 55 Issue 5 Pages
1778-1779
Published: May 15, 1986
Released on J-STAGE: June 01, 2007
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Kenji Harafuji, Hiroshige Watanabe, Shigeo Nagao
1986 Volume 55 Issue 5 Pages
1780-1781
Published: May 15, 1986
Released on J-STAGE: May 29, 2007
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Mitsuaki Ginoza
1986 Volume 55 Issue 5 Pages
1782
Published: May 15, 1986
Released on J-STAGE: June 01, 2007
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