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Hajime Hirooka, Nobuhiko Saitô, Joseph Ford
1984 Volume 53 Issue 3 Pages
895-898
Published: March 15, 1984
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Using a simple billiard system we first give a brief review of fundamental properties in an area-preserving mapping and then show, by revealing a mixing mechanism hidden around a hyperbolic fixed point in spite of the integrability theorem proven by Moser (Commun. Pure & Appl. Math.
9 (1956) 673), that chaos originates from homoclinic structures.
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Kaoru Shibata, Sadao Hoshino, Hideshi Fujishita
1984 Volume 53 Issue 3 Pages
899-902
Published: March 15, 1984
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Neutron scattering measurements of the dynamical structure factor
S(
Q, ω) of liquid Bi were carried out at 673 K in the range of the momentum transfer
Q from 0.6 to 1.6 Å
−1. Side peaks with the transfer energy less than about 8 meV were found in the
S(
Q, ω) curves for
Q≤1.2 Å
−1. They show a well defined dispersion curve which is connected with the dispersion line for small
Q determined from the sound velocity. This indicates that the propagating collective excitations exist up to a relatively large momentum region even in the non-simple liquid metal as Bi.
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Yoshihiro Ishibashi, Ikuo Suzuki
1984 Volume 53 Issue 3 Pages
903-906
Published: March 15, 1984
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The temperature dependence of the elastic constant
c66 of the (CH
3NH
3)
2MCl
4 (M=Mn, Fe, Cu, Cd) is discussed in the relationship with the successive structural phase transitions on the basis of a simple Landau-type thermodynamic potential. It has turned out that a sixth order term in the transition parameters plays an important role in determining the temperature behavior of
c66.
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Kazuo Gesi, Kunio Ozawa
1984 Volume 53 Issue 3 Pages
907-909
Published: March 15, 1984
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The effect of hydrostatic pressure on the Jahn-Teller induced phase transition in CsCuCl
3 (146°C at 0 GPa) was studied by dielectric measurements. The transition temperature decreases with increasing pressure with a rate of d
Tc⁄d
p=−6.6 K GPa
−1. The pressure effect is much insignificant than those in ABX
3 compounds which are caused by condensations of zone boundary soft phonons.
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Hideyo Yoshida, Manabu Endo, Tsutomu Kaneko, Toshio Osaka, Yasuharu Ma ...
1984 Volume 53 Issue 3 Pages
910-912
Published: March 15, 1984
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The dielectric constant along the
b axis, ε
b, of TlH
2PO
4 was measured and its domain structures were observed. It is found that TlH
2PO
4 is ferroelastic with the spontaneous shear strain
x5S=2.3×10
−2 at room temperature and undergoes a ferroelastic phase transition at 84°C (
T1), above which
x5S vanishes. ε
b shows a small anomaly at
T1. There are two kinds of domain structures at room temperature; one is the domain structure with the (100) and/or (001) domain walls which disappears above
T1 and the other is the structure with the (201) wall which has no relation with the 84°C transition.
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Nobuo Wada, Taro Ito, Takashi Watanabe
1984 Volume 53 Issue 3 Pages
913-915
Published: March 15, 1984
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A fluidity and a quantum effect of a new helium 4 system, unsaturated
4He adsorbed in a narrow void channel of Y-zeolite crystal, have been studied by measuring the heat capacity. In the case of the quantity adsorbed
n=0.445×10
−3 mol/g, the heat capacity
C is proportional to the temperature, i.e.
C=
nα
T, in the condition
Tc (=3.25 K)≤
T\lesssim9 K, and it reduces suddenly below
Tc. The coefficient α is 2.2 J/K
2/mol. The experimental result shows that the state above
Tc is a semiquantum liquid such as bulk
4He which remains liquid to much lower temperatures than the Debye temperature. Below
Tc, the result indicates the presence of an ordered state.
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Hiroshi Fukuyama, Yoshiyuki Miwa, Anju Sawada, Yoshika Masuda
1984 Volume 53 Issue 3 Pages
916-919
Published: March 15, 1984
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The specific heat and isochoric pressure of bcc solid
3He have been measured from 2 to 60 mK at densities near the melting curve. The thermodynamic consistency was obtained between both measurements. The second order coefficient
e3 in the high temperature series expansion of the specific heat was determined with satisfactory precision. The results were analysed using the current four-spin exchange model.
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Fumihisa Ono, Hiroshi Maeta, Tomoyoshi Kittaka
1984 Volume 53 Issue 3 Pages
920-923
Published: March 15, 1984
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A new model based upon the electronic 3d-band structure of ferromagnetic metals has been proposed for an explanation of the anomalous properties of defects in pure iron introduced by a low temperature electron or fast neutron irradiation. The abnormally high migration temperature of interstitials was explained by considering the atomic-level character of 3d-band electrons. The anomalously low migration temperature of vacancies in iron was also explained by using the same model.
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Naoki Toyota, Akihisa Inoue, Kunio Matsuzaki, Tetsuo Fukase, Tsuyoshi ...
1984 Volume 53 Issue 3 Pages
924-927
Published: March 15, 1984
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Results for the electrical resistance of the superconducting amorphous alloy Zr
70Ir
30 (ρ=300 μ
Ω·cm and
Tc=3.67 K) are reported. The resistance increases by amount of 3.7% on cooling from 300 K down to 10 K where it shows a hump, and then decreases rapidly approaching to
Tc. Above 27 K any magnetoresistance (MR) is not detected, but, in 1.7 K≤
T≤27 K, the positive MR is observed and becomes saturated above
Hs=12–13
T. The saturated resistance in
H≥
Hs is greatly enhanced on cooling with a singular dependence, −log
T. The paraconductivity near
Tc due to the superconducting fluctuation is explained by the Aslamasov-Larkin term, indicating an absence of the Maki-Thompson mechanism.
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Akio Yamagishi, Eiichi Nagao, Muneyuki Date
1984 Volume 53 Issue 3 Pages
928-931
Published: March 15, 1984
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High field diamagnetic susceptibility of organic liquids is measured by means of linear magnetic birefringence (Cotton-Mouton effect) in pulsed high magnetic field up to 400 kOe with special interest in the temperature dependence. It is found that the “Curie-Weiss law” should widely be applied for the high field diamagnetic susceptibility of organic liquids consisted of anisotropic diamagnetic molecules. The “Curie-Weiss constant”
Θ reflects the intermolecular correlation in liquids and the obtained values are 0, 145 and 165 K for benzene, chlorobenzene and nitrobenzene, respectively.
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Toshio Umemura, Yoshika Masuda
1984 Volume 53 Issue 3 Pages
932-934
Published: March 15, 1984
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The nuclear magnetic relaxation rate
T1−1 of
45Sc in metallic Sc has been measured in the temperature range between 1.3 and 300 K at resonance frequency of 50.0 MHz.
T1−1 is proportional to temperature at low temperature below about 150 K and then deviates from the linear relation of
T1T=1.60 sec-K and finally shows a temperature independent behavior of
T1=8 msec at high temperature above about 200 K. The relaxation rates were also measured as functions of resonance frequency in the temperature range from 1.3 to 4.2 K.
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Ken-ichi Yamamoto, Minoru Fukui, Ryuji Abe, Akira Sakai, Toshirou Yagi
1984 Volume 53 Issue 3 Pages
935-938
Published: March 15, 1984
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The dielectric constants ε
a, ε
b, and ε
c along the three crystallographic axes of the deuterated rubidium trihydrogen selenite RbD
3(SeO
3)
2 crystal have been measured in the temperature range including the ferroelectric phase transition. It has been found that ε
a shows a much larger peak at the phase transition than the peak of ε
b which is believed to be the dielectric constant along the polar axis in the ferroelectric phase. Some discussion for the crystal symmetry is presented in connection with the structure of the incommensurate phase.
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Masashi Ban, Toshihico Arimitsu
1984 Volume 53 Issue 3 Pages
939-942
Published: March 15, 1984
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The localized electron-phonon model, which was proposed by Takagahara, Hanamura and Kubo (THK), is extended by including the change of frequency and is treated analytically to obtain the response function and the photon echo signal. Our treatment also gives an analytical expression for the integrand of the transient emission spectrum of the second order optical processes in a localized electron-phonon system which was treated by THK in terms of the eigenvalue problem of the relaxation operator.
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Masasi Inoue, Hiroshi Negishi
1984 Volume 53 Issue 3 Pages
943-946
Published: March 15, 1984
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TiS
2 crystals with a 1T-CdI
2 type layered structure have been grown by a chemical vapor reaction under different conditions of transport gas, size of ampoule, and temperature. Various attempts to intercalate Mn metals into the TiS
2 layers were made using electrochemical, dipping in pyridine solution, thermal diffusion, and direct reaction methods. The EPR signals of the Mn-intercalated TiS
2 show a Mn
2+ state with the
g-value≈2 and the hyperfine structure constant
A=80×10
−4 cm
−1, indicating a strong ionic nature of the crystalline environment. A lattice expansion along the
c-axis upon intercalation is discussed.
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E. V. Krishnan
1984 Volume 53 Issue 3 Pages
947-949
Published: March 15, 1984
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The exact solutions of some nonlinear equations with higher order dispersive terms have been found using the properties of the Weierstrass elliptic function. The equations have been generalized to the (2
r+1)
th order which will have exact solutions.
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Shinsuke Watanabe
1984 Volume 53 Issue 3 Pages
950-956
Published: March 15, 1984
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Ion acoustic solitons are investigated theoretically in a plasma composed of electron, positive ion and negative ion. Due to the presence of negative ion, the property of the ion acoustic soliton is drastically modified. At the critical density of the negative ion, the nonlinear coefficient of the Korteweg-de Vries equation vanishes and then the ion acoustic wave is described by the modified Korteweg-de Vries equation. The transition from the Korteweg-de Vries soliton to the modified Korteweg-de Vries soliton is also studied by means of an evolution equation with quadratic and cubic nonlinearities.
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A. Jannussis, G. Karayannis, P. Panagopoulos, V. Papatheou, M. Symeoni ...
1984 Volume 53 Issue 3 Pages
957-962
Published: March 15, 1984
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An exact solution of Schrödinger equation is presented for the problem of a harmonic oscillator of mass varying with time and coordinates according to
m(
q,
t)=
m0⁄e
−νt−
k02q2.
This case, compared with known types of equivalent interactions, leads again to a new one that relates the damped harmonic oscillator with velocity-depentent interaction problem.
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Minoru Takahashi, Masatoshi Imada
1984 Volume 53 Issue 3 Pages
963-974
Published: March 15, 1984
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Thermodynamic properties of non-relativistic quantum systems are treated by the Monte Carlo calculation of path integrals. This method can be applied to the N-body problem. For boson systems the importance sampling of permutation and coordinates is efficient. For fermion systems direct calculation of determinant of propagators is efficient to avoid the negative sign problem.
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Huzio Nakano, Hatsuo Kimura
1984 Volume 53 Issue 3 Pages
975-983
Published: March 15, 1984
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By applying the method of symmetry breaking potential to the spin system on the rutile type crystal lattice with three sorts of exchange coupling, dependences of the spin structure on those couplings and the temperature are investigated up to the second order approximation. Thus, the phase diagram in the space of the exchange couplings and temperature is obtained, in which the phase of helical (screw-type) spin structure predicted by Yoshimori, MnF
2 type structure, and structure suggested by Bizette, Erickson and Yosida appear. For the helical structure, the temperature dependence of the pitch is calculated. The results are in good agreement with the experimental facts on the helical spin structure in the VF
2 crystal.
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Takeshi Mukoyama, Hirohiko Adachi
1984 Volume 53 Issue 3 Pages
984-990
Published: March 15, 1984
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X-ray emission rates for vacancies in various
M subshells have been calculated for rare earth elements between
Z=60 and 72. The relativistic Hartree-Fock-Slater atomic model with finite-size nucleus was used and all the calculations have been made relativistically. Contributions from all multipoles were included and the retardation effect was taken into account.
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Terumi Chikama, Kazuhiko Saikawa, Ryogo Kubo
1984 Volume 53 Issue 3 Pages
991-1000
Published: March 15, 1984
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In order to investigate the effect of perturbation caused by the interaction of a two-level atom with its environment on the coherency of light scattered by the atom when it is irradiated by an intense radiation, Mollow’s theory is generalized to include a random modulation of the resonance frequency as well as fluctuations of the incident field. Expressions for the power spectrum, the total intensity, the coherent scattering intensity and the broad Rayleigh scattering intensity are derived. Some general aspects of the problem are discussed.
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Akio Ootuka, Kiyoshi Kawatsura, Fuminori Fujimoto, Ken-ichiro Komaki, ...
1984 Volume 53 Issue 3 Pages
1001-1005
Published: March 15, 1984
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Cross sections for single and double K-shell ionization of Be were obtained from K
α diagram and hypersatellite X-ray yields produced by C, N, O and Ne ion bombardments with the energies from 0.3 to 1.3 MeV. The data are compared with the theoretical predictions which consider 2pσ-2pπ MO coupling. The results show a good agreement except for the collision system of Ne+Be.
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Katsuji Kaminishi
1984 Volume 53 Issue 3 Pages
1006-1016
Published: March 15, 1984
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Exact closed form expressions are derived for the photon number distribution functions and the factorial moments in resonance fluorescence from a two-level atom that is driven on or near resonance by a laser beam of finite bandwidth. Derivation procedure that was used by Lenstra in the theory of photon number statistics for limited cases is applied to our generalized problem with help of the theory of resonance fluorescence with excitation of finite bandwidth. All of the results are presented in a fully suitable form for practical analyses of statistical features of resonance fluorescence.
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Takeshi Miyazaki
1984 Volume 53 Issue 3 Pages
1017-1025
Published: March 15, 1984
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The Stokes flow due to the translation of a small particle in arbitrary directions is investigated in the presence of a circular disk. The solutions of the boundaryvalue problem are obtained in closed form to the point force approximation, by the use of the Green and Neumann functions supplemented by the edge function to remove the singularity at the rim of the disk. The force and torque experienced by the particle are determined on the basis of these solutions.
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Shosou Shingubara, Tatsuyuki Kawakubo
1984 Volume 53 Issue 3 Pages
1026-1030
Published: March 15, 1984
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The stability of the vortex formed around a sinkhole has been examined experimentally for various values of the amount of discharge
Q. Two types of vortices have been found to appear depending on the amount of discharge. Below some transition region of
Q, many weak vortices appear and fluctuate spatially and temporally; while above the transition region, a single stable vortex grows through a unification of several vortices. A typical example of the process of the unification of vortices has been presented and analyzed.
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Nobu Kuzuu, Masao Doi
1984 Volume 53 Issue 3 Pages
1031-1038
Published: March 15, 1984
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The Leslie coefficients of the nematic phase of concentrated solutions of rodlike polymers are calculated based on the molecular theory given in the previous paper (Kuzuu and Doi: J. Phys. Soc. Jpn.
52 (1983)). The Leslie coefficients are obtained in the form of an asymptotic expansion with respect to the concentration.
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Takashi Okazaki
1984 Volume 53 Issue 3 Pages
1039-1046
Published: March 15, 1984
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Heating mechanism by waves near the electron cyclotron frequency is theoretically analyzed in the current-sustaining plasma. The plasma can be heated more effectively by its anisotropy in addition to the electron cyclotron resonance. The heated region becomes broader than that of Maxwellian plasma.
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Shin Kubo, Teruji Cho, Masahiko Nakamura, Shuji Nakao, Takashi Shimozu ...
1984 Volume 53 Issue 3 Pages
1047-1057
Published: March 15, 1984
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When rf power in the range of lower hybrid frequency was injected into the microwave discharge plasma at the electron cyclotron resonance in the WT-2 toroidal device, the toroidal plasma current is generated, started up to
Ip∼5 kA, and sustained by rf power alone, without the Ohmic heating power (so-called rf tokamak). This lower-hybrid-wave driven current is produced only when high-energy tail electrons, which interact resonantly with the lower hybrid wave, are present in the initial electron cyclotron resonance plasma.
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Mitsuhiro Shigeta, Atsushi Fukuyama, Tomonori Takizuka
1984 Volume 53 Issue 3 Pages
1058-1061
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The radial diffusion of electrons due to high-n ballooning modes in a sheared magnetic field of tokamak is investigated. The
E×
B drift motion of electrons in a fluctuating electric field with many poloidal wave numbers is described by a radial kick. By a Taylor expansion of the safety factor
q(
r), the equation of motion is reduced to a standard map and the diffusion rate is estimated to be inversely proportional to the parallel velocity. The difference of the diffusion rate due to poloidal electric field fluctuation and radial magnetic field fluctuation is discussed.
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Naoyuki Mishima
1984 Volume 53 Issue 3 Pages
1062-1070
Published: March 15, 1984
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Crystal structures of Ca
2Sr(C
2H
5CO
2)
6 at sixteen temperatures between −160°C and 150°C have been determined accurately, using an X-ray four circle diffractometer. The occupancies of the three disordered methyl groups in a formula unit, together with the displacements of Sr, Ca and O atoms, vary with temperature in the same manner as the spontaneous polarization which takes a saturated value at −160°C. In contrast to this, one of the other methyl groups is in a state of partial disorder even at −160°C. The major part of the spontaneous polarization is explainable by displacements of Ca–O
6 octahedra relative to Sr ion. Using the result of the thermal expansion along the
c-axis measured by the Bond method, it was found that the spontaneous strain was compatible with the equivalent two sublattice model on the basis of the determined crystal structures.
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Tsutomu Asano, Hiroyuki Abe
1984 Volume 53 Issue 3 Pages
1071-1077
Published: March 15, 1984
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In order to study conformational change through a phase transition, the bulk sample of
n-hexatriacontane (
n-C
36H
74) was investigated by the X-ray diffraction method during crystallization in a temperature gradient. In the first stage of crystallization, the monoclinic rotator phase arises from a melt state, whose crystalline constants are a=4.98 Å, b=8.62 Å, c=48.10 Å, β=107.0°. By the second transition from the rotator phase, the monoclinic crystal is formed, whose unit cell dimensions are a=7.76 Å, b=4.90 Å, c=48.27 Å, β=106.0°. The both crystalline structures show that the chain axes are tilted from the layer plane.The second transition is performed by the change in the tilt direction of the molecules and by the anisotropic contraction of the intermolecular distances.
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Kazuko Motizuki, Keisuke Kimura, Etsuo And\={o}, Naoshi Suzuki
1984 Volume 53 Issue 3 Pages
1078-1086
Published: March 15, 1984
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Phonon anomalies of the 2
H-polytype TaSe
2 and NbSe
2, which reveal a structural phase transition at
T0=122.3 K and 33.5 K, respectively, have been studied theoretically. First, the phonon dispersion curves are calculated using the rigid ion model, and are in good agreement with the observation except for the
Σ1 mode along the
ΓM line. Then by taking into account the effective ion-ion interaction caused by the electron-lattice interaction, the observed anomalous behavior of the acoustic
Σ1 phonon branch is explained. It is shown that the temperature dependence of the effective interaction leads to a softening of the
Σ1 mode of the wave vector
q=(2⁄3)
ΓM which characterizes the superlattice below
T0.
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Yasunari Kurihara
1984 Volume 53 Issue 3 Pages
1087-1092
Published: March 15, 1984
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We discuss a competition between a spin-Peierls state and the antiferromagnetic state for a Heisenberg antiferromagnetic linear chain system including a phonon Hamiltonian. A Hartree-Fock approximation is applied to a Hamiltonian redescribed in terms of spin-less fermions. We get Dyson’s equation of phonons which is consistent with this Hartree-Fock approximation. We point out that Pytte’s work is not still complete even in the framework of the Hartree-Fock theory since a term was left out there which gave a quantitative difference between the Heisenberg model and the
X Y model. We find the softening of phonons in the antiferromagnetic state which has overcome the spin-Peierls state.
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Yoshihiro Ishibashi, Ikuo Suzuki
1984 Volume 53 Issue 3 Pages
1093-1096
Published: March 15, 1984
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The structure, the formation and the activation energies of a domain wall in crystals are discussed on the basis of analyses of a first order transition model. In the close vicinity of the transition temperature, the domain wall is considerably extended. For the estimation of the activation energy of a thick domain wall the method of the contour integral was adopted. It has turned out that the relative stability of an even and an odd walls varies with temperature.
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Mamoru Yamashita
1984 Volume 53 Issue 3 Pages
1097-1102
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A modulated structure of nematic phase owing to flexoelectric instability exposed to an electric field, investigated previously by Bobylev and his co-workers, is analyzed from a view point of nonlinearity. It is shown that energy minimum state is a nonlinearly modualted structure. A threshold effect of the electric field in a planar geometry is discussed on the basis of a vortex street model introduced previously by the present author.
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Kazuo Nakanishi, Hiroyuki Shiba
1984 Volume 53 Issue 3 Pages
1103-1113
Published: March 15, 1984
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Three-dimensional structures of charge-density waves in 1T-Ta dichalcogenides are studied on the basis of a phenomenological free energy, in which interlayer couplings up to the second neighbor layer are considered. Special attention is paid to the commensurate (C) and striped discommensurate (DC) states. Several stable stackings are obtained both in the C and striped DC states, where some of them in the C states are found to be disordered. The theory is applied to 1T-TaS
2, on which Tanda
et al. have made an X-ray experiment recently. To explain the experimental data a novel model is proposed for the C phase. In addition the structure of the new phase appearing between the C and nearly C phases is discussed from the standpoint of the striped DC state.
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Hiroshi Katayama-Yoshida, Koichi Shindo
1984 Volume 53 Issue 3 Pages
1114-1121
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The spin-polarized calculation of the electronic structure around a positive muon and boron at the tetrahedral interstitial site in silicon is carried out by use of the local spin-density functional formalism and the linear combination of atomic orbitals-Green’s function method. A paramagnetic solution is obtained. Bonding hyper-deep impurity states below the valence band and antibonding deep ones in the gap caused by the strong
sp-hybridization between the impurity orbitals and the tails of the surrounding host orbitals appear. The calculated value of the reduction of hyperfine coupling constant,
A, experienced by positive muon at absolute zero temperature is in good agreement with the experimental one. The hyperfine field of boron is predicted to be +29.72 kG. The 1
s core-polarization makes large negative contribution to the hyperfine field in the case of boron.
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Yoshichika \={O}nuki, Takemi Komatsubara, Rumiko Inada, Sei-ichi Tanum ...
1984 Volume 53 Issue 3 Pages
1122-1127
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The low temperature paramagnetism of 1T-TaS
2 has been confirmed to be due to Anderson localization by measuring the magnetic susceptibility of 1T-TaS
2 and 1T-TaS
1.7Se
0.3 whose crystalline defects were controlled by annealing. The data are well fitted to a Curie-Weiss equation, and the concentrations of localized spins decrease with an increase of annealing time. The magnitude and the sign of paramagnetic Curie temperature are sample-dependent and take both positive and negative values of −2.1 K to 4.8 K.
The correlation energy,
U of the Coulomb repulsive interaction when two electrons with the opposite spin occupy the same localized state is estimated to be 140 K for the 1T-TaS
2 single crystal.
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Yoshiyuki Ono, Jacek Kossut
1984 Volume 53 Issue 3 Pages
1128-1135
Published: March 15, 1984
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Anomalous magnetoconductivity in three demensions as a precursor effect of the Anderson localization is discussed for metallic samples of semimagnetic semiconductors such as Cd
1−xMn
xSe. Due to the large effective
g-factor (of the order of 10
2) arising from rather strong exchange interaction between electrons and magnetic ions (Mn ions), the spin flipping contribution to the quantum correction of the conductivity saturates at weak magnetic fields (∼1 kG). Parameters appropriate for Cd
0.95Mn
0.05Se gives a relative quantum correction of the conductivity of the order of 10
−2.
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Hironori Ushizaka, Shigeyuki Murayama, Yoshihito Miyako, Yûichi ...
1984 Volume 53 Issue 3 Pages
1136-1144
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Specific heat, AC susceptibility and magnetization have been measured on the mixed crystal of the cubic (CsCl-type) rare earth intermetallic compound Ce
1−xNd
xAg (0≤
x≤1). From the estimation of the magnetic contribution to the specific heat, it is found that Ce ion has a doublet state and Nd ion has a quartet state for the ground 4f energy level at any concentration of Nd. The magnetic
x-
T phase diagram was obtained from the temperature of the maximum in the specific heat and the susceptibility and the temperature of the magnetization disappearance. For 0.5<
x<0.8 antiferromagnetic↔weak-ferromagnetic phase transition occurs, where no anomalous behaviour in the specific heat is observed. This is analyzed to be due to the existence of a strong higher-order interaction in addition to the simple molecular field as
Hexch(exchange field)=λ
M+λ′
M3.
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Seiji Miyashita, Hiroyuki Shiba
1984 Volume 53 Issue 3 Pages
1145-1154
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A study is made on the antiferromagnetic plane rotator model on the triangular lattice by Monte Carlo simulations. In sharp contrast to the ferromagnetic case the specific heat shows a logarithmic divergence at a critical temperature and the magnetic susceptibility is almost independent of temperature over a wide temperature range. The origin of the divergent specific heat is ascribed to an order-disorder transition of chirality, which is introduced to characterize the two-fold degeneracy of the ground state. A discussion is made on the possible existence of an intermediate phase, in which the translational spin order vanishes, but the chirality order remains.
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Hitoshi Yamazaki
1984 Volume 53 Issue 3 Pages
1155-1159
Published: March 15, 1984
Released on J-STAGE: May 29, 2007
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Oscillations of magnon amplitude under intense parallel pumping have been observed in antiferromagnetic CuCl
22H
2O at the microwave power of
P⁄
Pc>12 dB, where
P is the incident microwave power and
Pc the threshold one for spin-wave instability. The measurements have been done at the temperature of 1.4 K and at the pumping frequency of 8.91 GHz. The fundamental frequency at the static magnetic field of 6300 Oe is 3.5 MHz at
P⁄
Pc=13.0 dB and increases gradually with increasing
P. With increasing pumping field it occurs subharmonics which is attributed to period-doubling bifurcations known as a route to chaos.
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Kiyoshi Deguchi, Eiji Nakamura, Etsuo Okaue
1984 Volume 53 Issue 3 Pages
1160-1163
Published: March 15, 1984
Released on J-STAGE: June 01, 2007
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The activation energy of dielectric critical relaxation in CsH
2(1−x)D
2xPO
4 (
x=0–0.98) has been examined, using the reported values of the relaxation time τ and the static dielectric constant ε
s which satisfy the relation τ⁄ε
s=ν
−1 exp (
ΔU⁄
kT) except in the vicinity of the Curie temperature. The activation energy
ΔU increases pronouncedly with the increase in the deuteron concentration
x, whereas the frequency factor ν remains unchanged. By applying the kinetic quasi-one-dimensional Ising model by Zumer, it is found that the remarkable increase in
ΔU with deuteration is attributable to the increase in
J⁄⁄, where
J⁄⁄ is the intrachain coupling parameter between the nearest neighbor dipoles.
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Kazuo Nakamura, Giyuu Kido, Kenji Nakao, Noboru Miura
1984 Volume 53 Issue 3 Pages
1164-1175
Published: March 15, 1984
Released on J-STAGE: June 01, 2007
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A new structure has been found in the far-infrared magneto-reflection spectra under high magnetic fields. The structure is attributed to the electron-hole coupled plasma mode in a classical point of view. A line-shape analysis is carried out quantum mechanically on the basis of the Slonczewski-Weiss-McClure band model. This analysis can reproduce not only the new structure mentioned above but also the total line-shapes fairly well. Analysing the calculated dielectric constant, the origins of the new structure and other characteristic structures are explored. As for the new structure, it is concluded that the electron-hole coupled plasma mode is the main origin, but the transition between the Landau levels
n=−1 and
n=0 also gives a little contribution to the structure.
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Hidenori Abe, Ryumyo Onaka
1984 Volume 53 Issue 3 Pages
1176-1184
Published: March 15, 1984
Released on J-STAGE: May 29, 2007
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The fundamental absorption spectra of solid carbon dioxide are studied in the energy region from 9.2 eV to 30.0 eV, and the valence states are studied by means of X-ray photoelectron spectroscopy (XPS). The XPS spectra manifest that the electronic structure in solid phase is not very different from that in gas phase. The absorption spectra show four prominent peaks in the energy region from 10.0 eV to 12.0 eV, three of which are analyzed quantitatively as the excitons arising from the molecules in optically allowed excited states
1Σu+ and
1Πu. The exciton excitation energies are calculated and show a good agreement with the experimental spectra. The
1Πu state in gas phase is split into two by inter-molecular interactions in solid phase and gives rise to the peaks at 11.0 eV and 11.2 eV in the absorption spectra.
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Masuo Fukui, Atsushi Kamada, Osamu Tada
1984 Volume 53 Issue 3 Pages
1185-1190
Published: March 15, 1984
Released on J-STAGE: June 01, 2007
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ATR analysis (Kretschmann configuration) has been carried out for c1-surface exciton polaritons (SEP’s) in anisotropic ZnO thin films. The effect of additional boundary conditions (ABC’s) on ATR spectra due to the SEP’s has been discussed. We employ two typical types of ABC’s, i.e. Kliewer-Fuchs type and Rimbey-Mahan type. The numerical calculations have clearly shown that the ATR spectra for frequency scans are strongly affected by the form of ABC’s.
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Minoru Itoh
1984 Volume 53 Issue 3 Pages
1191-1201
Published: March 15, 1984
Released on J-STAGE: June 01, 2007
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Recombination luminescence (π and σ) in KI has been observed with red light stimulation after or during exposure at 78 K to UV light. Using a pulse annealing technique, the hopping migration of V
K centers is studied by monitoring the decrease of the photostimulated luminescence as a function of time and temperature. It is confirmed that the long-range diffusion of V
K centers is characterized by a thermal activation energy of 0.27 eV. When a preexposed sample is warmed to 124 K, subsequent red irradiation at 78 K is found to stimulate the E
x (3.02 eV) emission in place of the π emission. This can be regarded as evidence in favor of the extrinsic nature of the E
x emission. Thermal quenching of the E
x, π and σ emissions is also investigated in detail under UV light excitation. On the basis of these results, we discuss the nonradiative decay process of the self-trapped excitons in KI.
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Masayoshi Nakamura
1984 Volume 53 Issue 3 Pages
1202
Published: March 15, 1984
Released on J-STAGE: June 01, 2007
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