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Kazuyosi Ikeda
1986 Volume 55 Issue 4 Pages
1037-1040
Published: April 15, 1986
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The models of one-dimensional
r-component gas of molecules with hard cores of different diameters σ
1, σ
2, …, σ
r (σ
i=diameter of the hard core for the
i-th component) and with attractive interaction potentials −2
aij⁄
L (
aij=positive constant,
i,
j=1, 2, …,
r,
L=length of the vessel of the gas,
L→∞) or with attractive interaction potentials −
aijγ
e−γR (
aij=positive constant,
i,
j=1, 2, …,
r, γ→+0,
R=distance between a pair of molecules) are treated. The equation of state and the thermodynamic functions are rigorously obtained.
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Akira Onuki
1986 Volume 55 Issue 4 Pages
1041-1044
Published: April 15, 1986
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Some conjectures and scaling arguments are given for entangled polymers in a Couette flow with strong velocity gradient. Polymers are envisaged to consist of cigar-like blobs oriented along the flow. Predictions are made on the anisotropy of the scattered intensities. The non-Newtonian effect is also examined.
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Tosiya Taniuti
1986 Volume 55 Issue 4 Pages
1045-1046
Published: April 15, 1986
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It is shown that the modified zero-fourth-order cumulant approximation gives exact solutions, if and only if the fourth-order cumulant satisfies a certain condition.
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Yukiharu Ohsawa
1986 Volume 55 Issue 4 Pages
1047-1050
Published: April 15, 1986
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It is shown that a non-relativistic theory for laminar shocks breaks down for a plasma having a rather high Alfvén speed,
vA\gtrsim
c(
me⁄
mi)
1⁄2. By using a 2–1/2 dimension, fully relativistic, fully electromagnetic particle code, time evolution of quasi-perpendicular shocks in such plasmas is studied. Some ions and electrons are accelerated simultaneously to highly relativistic speeds by the shock.
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Mitsuo Harada
1986 Volume 55 Issue 4 Pages
1051-1053
Published: April 15, 1986
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The phase transition of K
2Ba(NO
2)
4 at
Tc=−74°C has been investigated by X-ray diffraction. In the low-temperature phase (
T<−74°C), superlattice reflections are observed at body center positions (
h+1⁄2,
k+1⁄2,
l+1⁄2). In this phase, we find antiferroelectric order of NO
2-groups. Diffuse scattering above
Tc is found to be anisotropic. It is suggested that the transition has two-dimensional nature.
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Tsuneyoshi Nakayama
1986 Volume 55 Issue 4 Pages
1054-1057
Published: April 15, 1986
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It is pointed out that, for the anomalous thermal boundary conductances between metal particles and liquid
3He observed at mK temperatures, randomly distributed spins near the surface and the soft mode of metal particles play a comparable role. This is concluded from the analysis of the recent measurements of boundary conductances by Osheroff and Richardson, where a novel magnetic field dependence has been found for the boundary between silver particles and liquid
3He in the mK region.
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Hiroshi Yasuoka, Akihiko Soyama, Kaoru Kimura, Shin Takeuchi
1986 Volume 55 Issue 4 Pages
1058-1061
Published: April 15, 1986
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The temperature dependences of NMR spin-echo spectrum and magnetic susceptibility have been measured in the quasicrystalline phase of Al
80Mn
20. Compared with the equilibrium crystalline (hexagonal) phase, the susceptibility shows a marked temperature dependence below about 100 K. The widely distributed and temperature dependent NMR spin-echo spectrum has been observed only for the Al sites with a characteristic line shape at low temperatures that we tentatively attributed to a spin-density-wave like random distribution of the local fields at the Al sites. The lack of NMR signal associated with the Mn sites and the temperature dependence of the susceptibility suggest the formation of local magnetic moments on the Mn sites in the quasicrystalline phase.
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Kenji Shimizu, So-haku Okeya
1986 Volume 55 Issue 4 Pages
1062-1065
Published: April 15, 1986
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Spin echo NMR measurements on
159Tb have been done in magnetically ordered state of the cubic Laves phase compounds Tb(Fe
1−xCo
x)
2 and Tb
0.8Y
0.2Fe
2. Satellite structures observed in the compounds with
x≤0.2 are assigned to various Fe, Co configurations in the nearest neighbor shell. The resonance frequency corresponding to the −1⁄2↔1⁄2 transition decreases from 3798±3 MHz in TbFe
2 to 3387±3 MHz in TbCo
2 with increasing Co concentration. The frequency differences between the lines corresponding to the −3⁄2↔−1⁄2 and −1⁄2↔1⁄2 transitions are 685±6 MHz in TbFe
2 and 675±7 MHz in TbCo
2.
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Takao Goto, Satoru Maegawa, Takao Kawai
1986 Volume 55 Issue 4 Pages
1066-1069
Published: April 15, 1986
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The nuclear spin-lattice relaxation time
T1 of
87Rb in the singlet-ground-state easy-plane antiferromagnet RbFeCl
3 has been measured at the temperatures above and below
TN≈2.5 K with the external field applied both along and perpendicularly to the hard
c-axis. From the analysis based on the dynamical correlated-effective-field approximation, it is found that the trend of the divergence of
T1−1 in the paramagnetic phase around
TN is closely related to the remarkable softening of the magnetic excitation for the K-point mode (
q=
q0) via the in-plane component of the static susceptibility χ(
q0).
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Hideaki Mitsutake, Masashi Yoshida, Kaizo Nakamura, Yoshio Nakai
1986 Volume 55 Issue 4 Pages
1070-1073
Published: April 15, 1986
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The incident photon energy dependence of multiple LO phonon scattering lines has been investigated in InBr under the excitation in the first exciton region (2.331 eV,
E⁄⁄
c) at 2 K. Each LO line shows strong outgoing resonance at the first exciton energy. The calculation of the cross section for the 2LO phonon scattering is carried out and it is indicated that the interband LO phonon scattering of exciton between
p and
s exciton states is the important relaxation process in InBr.
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Tetsuro Konishi, Miki Wadati
1986 Volume 55 Issue 4 Pages
1075-1088
Published: April 15, 1986
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The quantum nonlinear Schrödinger model under external force is studied. Through the quantum inverse scattering method, the transition amplitude between 1-soliton state and 2-soliton state is exactly calculated. The frequency dependence of the transition amplitude has an interesting property that the amplitude diverges at certain frequencies. This implies that a quantum soliton breaks up into solitons resonantly with external force. This phenomenon is called the resonant breakup of quantum soliton.
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Hiroshi Ueyama
1986 Volume 55 Issue 4 Pages
1089-1091
Published: April 15, 1986
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A general theory of fluctuations of the hypercycles is presented. Since the elementary process is inherently non-deterministic, the hypercycle is also subject to fluctuations. On the basis of the simplified model of Schuster and Sigmond, a set of coupled nonlinear Langevin equations is obtained. The analytical solution is given for the simplest case of the length
n=2. The stationary distribution function is completely different from what is expected from the deterministric analysis, and it shows that the shortest hypercycle is “dead” at all.
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Atsuo Kuniba, Yasuhiro Akutsu, Miki Wadati
1986 Volume 55 Issue 4 Pages
1092-1101
Published: April 15, 1986
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Presented is an exactly solvable 3-state IRF model which generalizes the Baxter’s hard hexagon model. The free energy is calculated. The model is related to a partition identity, the Gordon’s generalization of the Rogers-Ramanujan identity.
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Kiyoshi Kawade, Hiroshi Yamamoto, Masaya Yoshida, Tetsuro Ishii, Keigo ...
1986 Volume 55 Issue 4 Pages
1102-1107
Published: April 15, 1986
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The half-life and the multipolarity for the 213 keV transition in
93Sr have been determined to be (4.6±0.3) ns and E2 (≤15%Ml) from β-γ delayed and x-γ coincidences, respectively. The half-life for the 204 keV transition in
95Sr was also determined to be (20.9±0.5) ns. The reduced transition probabilities are deduced as
B(E2)=(261
−43+17)e
2fm
4 for the 213 keV transition and
B(E2)=(71±2)e
2fm
4 for the 204 keV transition. These
B(E2) values are comparable to the Weisskopf estimates and to those for the similar transitions in the neighbouring nuclei.
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Hideki Iimura, Takeshi Seo, Shigeru Yamada
1986 Volume 55 Issue 4 Pages
1108-1121
Published: April 15, 1986
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Gamma-gamma angular correlations have been measured for 25 cascading transitions in
149Pm following the decay of 1.7-h
149Nd. The spins of the 288.21-, 425.30- and 515.66-keV levels in
149Pm have been assigned as 9/2, 7/2 and 9/2, respectively. The E2/M1 mixing ratios of 15 transitions have been derived. A new level at 872.32 keV has been introduced from the results of γ-ray singles and γ-γ coincidence measurements. Experimental level energies and E2/M1 mixing ratios have been compared with predictions based on current theoretical models.
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Shin-ichiro Kuruma, Kunioki Mima
1986 Volume 55 Issue 4 Pages
1122-1129
Published: April 15, 1986
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The influence of electron beam energy spread on FEL gain is investigated quantitatively. The dispersion relation is derived according to Johnston’s formulation. As the results of the analysis, it is found that the growth rate of the high frequency FEL instability is greater (less) than that of the low frequency instability when the beam energy spread
Δγ<(>)
Δγ
c. Here,
Δγ
c is the critical beam energy spread which depends upon the beam current and energy, the wiggler wavelength and so on.
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Shinichiro Yanase
1986 Volume 55 Issue 4 Pages
1130-1138
Published: April 15, 1986
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The effect of the time-periodic temperature oscillation upon the stability of a horizontal fluid layer in the presence of a stable salinity gradient is studied theoretically using the Galerkin method. The results of numerical calculation show that the critical Rayleigh number
Rac becomes minimum at a certain positive value of the saline Rayleigh number
Rs. The destabilizing effect of the salinity stratification is found to be due to the coupling of the oscillating basic temperature field with the salinity disturbance.
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Katsuji Chiyoda
1986 Volume 55 Issue 4 Pages
1139-1141
Published: April 15, 1986
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The Taylor Theory is applied to an ideal magnetohydrodynamic (MHD) plasma with the fluid motion. The Woltjer’s two invariants are used. The field quantities are derived and the energy of the system is analysed. It will be found that the sum of the material pressure and the kinetic pressure becomes homogeneously distributed. Some consideration on the β-value is described.
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Kazuo Minami, Koichi Izawa, Masanobu Kaminaga, Kazushige Ishii
1986 Volume 55 Issue 4 Pages
1142-1150
Published: April 15, 1986
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Localized electron plasma oscillations excited at the resonant surface by low-power microwaves incident obliquely on an inhomogeneous unmagnetized plasma in a cylindrical waveguide are measured by a receiving antenna. The disturbance by the antenna on the electrostatic fields is significantly reduced in our condition with a steep density gradient and large angles of incidence. As a result, patterns of large and broad resonance field including phase information are observed. The peak values of the resonantly excited field are compared with numerical analyses.
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Satoshi Sugano
1986 Volume 55 Issue 4 Pages
1151-1162
Published: April 15, 1986
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The drift orbit in the axisymmetrized tandem mirror Gamma 10 is calculated without recourse to the paraxial approximation, but with the use of the accurate magnetic field. The electrostatic potential is ignored. Two types of characteristic orbits are found, one is the higher order resonant orbit and the other the stochastic broadening orbit. Higher order resonant orbits occur in those particles which are trapped in a far-axis region of the combined central and anchor cell region, whereas stochastic broadening orbits are found for the particles trapped in the anchor cell region alone. The resonance conditions for higher order resonances are given by
Δθ\simeqπ⁄6 and π⁄4 where
Δθ is the drift azimuthal angle. These resonant orbits occur in the low energy regime, and thus they are expected to give a significant influence on the transport process in the far-axis region of Gamma 10.
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Shoji Kashida, Shoichi Sato
1986 Volume 55 Issue 4 Pages
1163-1170
Published: April 15, 1986
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Successive structural phase transitions in a linear chain compound (CH
3)
3NHCdBr
3(TrMCB) have been studied by X-ray diffraction. The structure of the (\sqrt3×\sqrt3)
R30° phase, which exists above 379 K is refined by a block-diagonal least squares method; the final
R-factor is 0.065. The structure belongs to the hexagonal space group
P\bar62
m, where a partial disorder of CdBr
3, chains occurs; the chains are rotated in antiphase in two of the three sublattice sites, while in the third site the chains are in disorder and can be represented by a superposition of the states in the former two sites. A close resemblance to the “partially disordered state” which was recently found in some triangular Ising antiferro-magnets is referred.
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Nitish K. Sanyal, Sugriva Nath Tiwari, Mihir Roychoudhury
1986 Volume 55 Issue 4 Pages
1171-1176
Published: April 15, 1986
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Using quantum mechanical methods, infer-molecular interactions between a pair of p-n-methoxybenzoic acid (pMA) molecules have been evaluated. CNDO/2 method, has been employed to compute net atomic charge and corresponding dipoles at each atomic centre while inter-molecular interaction energy values have been obtained using second order perturbation theory with multicentred-multipole expansion method. Stacking as well as in-plane interactions between a pair of pMA molecules have been considered. Results have been examined in the light of experimental evidences and an attempt has been made to obtain the related parameters such as molecular ordering etc. and the nature of the molecule in the liquid phase.
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Masanobu Yoshikawa, Shinichi Nakashima, Atsuo Wada, Akiyoshi Mitsuishi
1986 Volume 55 Issue 4 Pages
1177-1187
Published: April 15, 1986
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Polarized Raman spectra of NH
4-TCNQ-I and -II have been observed in the temperature range including phase transition temperatures
Tc=301 and 215 K, respectively. The intensity of low frequency modes decreases rapidly with approaching the phase transition temperature from below. Mode assignment has been made on low frequency modes in the low temperature phase of two crystals. A comparison among Raman spectra of NH
4-TCNQ-I and alkali metal-TCNQ salts reveals that NH
4-TCNQ-I resembles K-TCNQ in the stacking arrangement of the TCNQ molecules in the chains. The intensity variation is discussed in terms of the change of Raman selection rule and Raman polarizability by the dimerization of the TCNQ molecules.
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Yutaka Nakai, Nobuhiko Yamamoto, Nobuhiko Kunitomi, Norio Achiwa
1986 Volume 55 Issue 4 Pages
1188-1195
Published: April 15, 1986
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The occupation probability of Fe or Cr atoms on the four crystallographically different sites of α-Mn has been measured by means of neutron diffraction. The experimental results are explained by considering the attractive interaction between the host and impurity atoms in addition to the space-filling concept. The magnetic structures of the alloys are also determined and are discussed based on the relation to the variation of the Néel temperatures with the alloy composition, estimated from the temperature variation of the specific heat and the electrical resistivity.
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Masahito Yoshizawa, Ichimin Shirotani, Tadao Fujimura
1986 Volume 55 Issue 4 Pages
1196-1202
Published: April 15, 1986
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Temperature dependence of specific heat at constant pressure, and temperature and hydrostatic pressure dependence of elastic constants have been measured on single crystals of black phosphorus. Elastic softening is observed in
c55 with decreasing temperature. The elastic constants
c11,
c22 and
c33 increase with pressure up to 6–7 kbar. Deformation potential effect in this system is discussed.
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Toshio Kosugi, Yoshiaki Kogure, Yosio Hiki, Takao Kino
1986 Volume 55 Issue 4 Pages
1203-1212
Published: April 15, 1986
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Attenuation of megahertz ultrasound has been measured in an aluminum crystal under hydrostatic pressure at room temperature. From the pressure dependence of attenuation at various sound frequencies, the pressure dependence of damping constant for dislocation motion was determined by an analysis based on the overdamped resonance theory of dislocation. Specimen used was primarily zone-refined 99.9999% Al single crystal containing 1 ppm of Si as impurities. The specimen was irradiated by neutrons and 2–4 ppm of Si atoms were further introduced by a nuclear reaction. The specimen was also heat-treated in various ways. Thus the amount and state of impurity atoms were altered, and the high pressure experiments were made for the specimen in different states. The pressure dependence of damping constant was found to be very sensitive to the state of impurities. The order of magnitude and even the sign of the dependence were different for different impurity states. A qualitative discussion was given to interpret the experimental results.
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Chioko Kaneta, Hiroshi Katayama-Yoshida, Akira Morita
1986 Volume 55 Issue 4 Pages
1213-1223
Published: April 15, 1986
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Calculation of the lattice dynamical properties of black phosphorus, which is a narrow-gap covalent semiconductor with a layered structure, based on the valence force field model is presented. The results obtained are in good agreement with the experiments, except for infrared active optical modes. The results are discussed in connection with the crystal structure and the chemical-bonding nature of black phosphorus.
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Chioko Kaneta, Akira Morita
1986 Volume 55 Issue 4 Pages
1224-1232
Published: April 15, 1986
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Calculation of the lattice dynamical properties of black phosphorus based on the adiabatic bond charge model (BCM) is presented. The results obtained are in good agreement with the experiments including infrared active optical modes which were unable to be explained by the valence force field model. It is shown that the success of BCM in explaining these modes is attributed to the fact that it contains the degrees of freedom corresponding to the polarization accompanying these modes.
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Masashi Takigawa, Gunzi Saito
1986 Volume 55 Issue 4 Pages
1233-1243
Published: April 15, 1986
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The
77Se nuclear spin echo decay rate (1/
T2) in the organic conductor (TMTSF)
2ClO
2 was found to exhibit a large peak around 30∼32 K, slightly above the structural phase transition temperature
Tt=24 K. The peak was more pronounced with increasing field. This result indicates that the slow motion of TMTSF molecules with large amplitude, most probably associated with change in the molecular orientation, develops above
Tt, which gives rise to spin echo decay via. the fluctuations of the anisotropic Knight shift. From the analysis of the spin echo decay, it is found that the amplitude of this motion reaches maximum at 30∼32 K and its correlation time is estimated to be 10
3∼10
−5 sec depending on temperature. A change was found also in the
77Se NMR spectrum in this temperature region which may be interpreted as the motional narrowing effect.
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Yutaka Kaneko, Akira Ueda, Yasuaki Hiwatari
1986 Volume 55 Issue 4 Pages
1244-1251
Published: April 15, 1986
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The ionic soft-core system, as a model of α-AgI, of which pair potential consists of only Coulombic and soft-core repulsive terms is characterized by two parameters σ
Ag⁄σ
I, the ratio of the ionic core radii, and
Γ, the ratio between the strengths of the both terms. The system is extensively studied with use of the molecular dynamics method to clarify characteristic features of interionic potentials which play an important role for the existence of the ion-conducting α-phase. Dependences of the system on
Γ and σ
Ag⁄σ
I are investigated. Our results suggest that the Pauling’s concept of the additivity rule of ionic radii is necessary for stabilization of anion sublattice and that the Coulomb force must be appropriately weak for diffusive motion of cations to take place.
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Masao Ogata, Yasushi Wada
1986 Volume 55 Issue 4 Pages
1252-1265
Published: April 15, 1986
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It was found that Brownian-like motion of a φ
4 kink is induced by two mechanisms. One is a random walk whose basic steps are shifts of the kink due to collisions with thermally excited phonons. It was studied by Wada and Schrieffer. The other is an ordinary Brownian motion, where friction is caused by momentum transfers in the collision. It was studied by the present authors. The relation between the two is clarified with the help of fluctuation-dissipation theorem for the kink motion. In the static limit, the second mechanism is dominant and the Einstein relation
D=
kBT⁄
MΓ∝(
kBT)
−1 holds, where
M is mass of the kink. When the frequency is not zero and the temperature is low enough, the first mechanism becomes dominant and the diffusion constant is proportional to (
kBT)
2. It is four times as large as the previous result.
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Yasunori Kubo, Shinya Wakoh, Karlheinz Schwarz
1986 Volume 55 Issue 4 Pages
1266-1281
Published: April 15, 1986
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The theoretical momentum density distributions (MDD) in NbO measured by Compton profile experiments and positron annihilation techniques are calculated by the APW method. The difference between Compton profile and the positron annihilation profile comes from the trapping of positrons at vacancies. The trapping effect makes the positron annihilation profiles broader a little. In order to express the ground state of a positron in NbO by the APW method, 33 augmented plane waves with at least three angular momentum quantum number terms (
l=0, 2 and 4) are found to be necessary. Both the Compton profiles and positron annihilation profiles show anisotropies, but those structures are different from each other. It is shown that the anisotropies are due to the fully occupied bands as well as to the topology of the Fermi surfaces. But folded MDD’s to the first Brillouin zone show the characteristic structures of the Fermi surfaces very well.
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Hiroaki Hazama, Tetsuya Sugimasa, Tadasi Imachi, Chihiro Hamaguchi
1986 Volume 55 Issue 4 Pages
1282-1293
Published: April 15, 1986
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Effective masses in GaAs, InSb and InP are determined in the temperature range from 77 to 300 K from the magnetophonon resonance experiments. An expression for the conduction band effective mass valid for zinc blende crystals is derived by the
k.p perturbation theory and by taking into account the higher lying bands, where two momentum matrix elements
P0 and
P1 appear. The momentum matrix elements are estimated from the parameters determined from the energy band calculations. Temperature dependence of the effective mass is calculated using the expression derived in this paper and dilational change of the energy gaps which are estimated from the pseudopotential method and the experimental data of the linear thermal expansion coefficient. Reasonable agreement is obtained for GaAs but agreement is not so good in InSb and InP.
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Akihiko Sumiyama, Yasukage Oda, Hiroshi Nagano, Yoshichika \={O}nuki, ...
1986 Volume 55 Issue 4 Pages
1294-1304
Published: April 15, 1986
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The electrical resistivity, magnetoresistance and magnetic susceptibility of single crystalline Ce
xLa
1−xCu
6 (
x=0–1) have been measured down to mK region. As the Ce concentration is increased, the consecutive change from the dilute (incoherent) Kondo regime to the Kondo lattice (coherent) regime is observed. The characteristic features in the coherent Kondo regime are clearly observed in the resistivity and the magnetoresistance above
x=0.7. The low temperature resistivity in Ce
xLa
1−xCu
6 shows a
T2 dependence and the residual resistivity follows the Nordheim law. As for the coherence effect in CeCu
6, the resistivity follows a
T2 dependence below 0.1 K, the magnetoresistance changes from negative to positive below about 0.15 K within applied magnetic fields and the susceptibility shows an enhanced Pauli paramagnetism below 1 K.
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Munehiro Tabata, Masaharu Satoh, Keiichi Kaneto, Katsumi Yoshino
1986 Volume 55 Issue 4 Pages
1305-1310
Published: April 15, 1986
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Poly(
p-phenylene) films with a conductivity of
ca. 100 S/cm are synthesized by a new method of electrical oxidation of benzene using the composite electrolytes of CuCl
2/LiAsF
6. An
in situ study of the absorption spectra of the poly(
p-phenylene) films during the electrochemical doping with AsF
6 has been carried out. From the absorption spectrum of undoped state, we find a strong absorption peak at
ca. 3.4 eV which is associated with the transition from ground-state to excited-state. The remarkable changes of the absorption spectra below the photon energy of 3.0 eV are observed, which are related to the polaron and/or bipolaron states of this polymer. The electrochemical
n-type doping is also demonstrated.
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Motohiko Saitoh
1986 Volume 55 Issue 4 Pages
1311-1318
Published: April 15, 1986
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By the use of the path-integral method, general formula of the free energy and the conductivity of electrons in a two-dimensional Wigner crystal are obtained when both of the electron-electron and the electron-surface interactions are present. The dc conductivity is calculated explicitly for electrons bound on the surface of liquid He in the case of the weak electron-ripplon coupling. Good agreement is obtained between theory and experiment about the density dependence of the collision time.
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Junichi Wakabayashi, Shinji Kawaji, Junji Yoshino, Hiroyuki Sakaki
1986 Volume 55 Issue 4 Pages
1319-1326
Published: April 15, 1986
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Temperature dependence of the diagonal resistivity ρ
xx at the minimum of the 1/3 and 2/3 fractional quantum Hall effect has been measured for GaAs/AlGaAs heterostructures having wide variety of mobility. The results are well expressed by assuming two activated conduction processes. The activation energies in high temperature region do not show a systematic dependence on the magnetic field B but on the μ
B, where μ is the electron mobility at zero field. The activation energy for the 2/3 effect is about one third of that for the 1/3 effect when scaled by μ
B. This result shows that there is no electron-hole symmetry in the experimental activation energy.
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Yoshiaki Hamaue, Ryôzô Aoki
1986 Volume 55 Issue 4 Pages
1327-1335
Published: April 15, 1986
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The heat capacity, resistivity and superconductivity of layered compound 2
H-NbS
2 intercalated with organic molecules have been studied. Heat capacity data show that upon intercalation the superconducting transition temperature decreases from 6.1 K to 2.1–4.1 K and both the Debye temperature and coefficient of electronic specific heat decrease. The temperature dependence of the resistivity measured along the layer plane is also influenced by intercalation. Experimental results are discussed in terms of nearly two-dimensional characters of conduction electrons and phonons. The electron-phonon coupling constant and the electronic density-of-states at the Fermi energy
N(0) are estimated. It is shown that
N(0) for intercalation compounds is able to be interpreted by the two-dimensional electronic nature.
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Kei-Ichiro Kobayashi, Kazuo Kanematsu
1986 Volume 55 Issue 4 Pages
1336-1340
Published: April 15, 1986
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Lavas phase compounds (Y
xZr
1−x)Fe
2 have C15 structure, and are ferromagnetic. They absorb hydrogen under the condition of 1 atm, room temperature, to form hydrides (Y
xZr
1−x)Fe
2H
y. Hydrogen content
y increases from O(ZrFe
2) to 4.2(YFe
2) with
x continuously. The dependence of μ
Fe and
Tc of hydrides on
x is different for hydrogen content, namely
y>3 or
y<3. In
y\gtrsim3, the hydrogen is assumed to form spinel structure with parent compound and the hydrogen is in H
− like state. In
y\lesssim3, it is assumed that the hydrogen forms solid solution in H
+ like state.
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Shin-ichi Kashiba, Sadamichi Maekawa, Saburo Takahashi, Masashi Tachik ...
1986 Volume 55 Issue 4 Pages
1341-1349
Published: April 15, 1986
Released on J-STAGE: June 01, 2007
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The effect of crystal field on Kondo resistivity in metals with Ce impurities is theoretically studied. The
T-matrix of conduction electron is calculated in the self-consistent ladder approximation by applying Abrikosov’s pseudofermion technique to the Coqblin-Schrieffer exchange model. The numerical results of the resistivity in cubic and tetragonal crystals are compared with the experimental ones in Ce
xLa
1−xAl
2 and CeCu
2Si
2. Our theory provides a unified view of the magnetic and transport properties in Ce compounds and alloys.
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Nobuyuki Momozawa, Yasuo Yamaguchi, Masaru Mita
1986 Volume 55 Issue 4 Pages
1350-1358
Published: April 15, 1986
Released on J-STAGE: June 01, 2007
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Neutron diffraction study was carried out on a single crystal of Ba
2Mg
2Fe
12O
22. The magnetic structure of Ba
2Mg
2Fe
12O
22 changes at 195 K, collinear ferrimagnet above 195 K and proper helix below 195 K. The helix is propagated along the
c-axis by rotations of the large and small spin-bunches. The turn angle of the helix is 59.6° at 77 K and rapidly decreases as the temperature approaches 195 K. Results are discussed from a point of view of the exchange interactions.
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Macoto Kikuchi, Yutaka Okabe
1986 Volume 55 Issue 4 Pages
1359-1363
Published: April 15, 1986
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We report a Monte Carlo study on the critical relaxation of the three-dimensional kinetic Ising model from a nonequilibrium initial state. It is shown that the details of the method, namely, a choice of the sampling procedure and a functional form of the transition probability do not affect an asymptotic power-law relaxation. The finite-size effects on the critical relaxation is also studied. Cross-over from the power-law relaxation to the exponential one is found, which is discussed in view of the dynamical finite-size scaling theory.
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Toshihiro Takahashi, Yutaka Maniwa, Hiroki Kawamura, Gunzi Saito
1986 Volume 55 Issue 4 Pages
1364-1373
Published: April 15, 1986
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The static properties of spin density waves (SDW) in (TMTSF)
2PF
6 were determined by a precise analysis of
1H-NMR lineshape in the low temperature SDW state. The observed angular dependence of lineshape was well reproduced by a picture of incommensurate sinusoidal SDW’s. The wave number was found to be (0.5, 0.24±0.03, −0.06±0.20) in the units of
a*,
b* and
c*. This value is very near the optimal nesting vector recently calculated. The SDW amplitude at low temperature was estimated as 8% μ
B/molecule.
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Mizuhiko Ichikawa
1986 Volume 55 Issue 4 Pages
1374-1379
Published: April 15, 1986
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The temperature variation of the lattice constants below room temperature has been measured on an X-ray four-circle diffractometer for antiferroelectric CsH
3(SeO
3)
2 and CsD
3(SeO
3)
2. The results confirm that the −65°C transition in CsD
3(SeO
3)
2 corresponds to the −128°C antiferroelectric transition in CsH
3(SeO
3)
2. It is shown that the monoclinic modification of CsD
3(SeO
3)
2 exists in as-grown crystals at room temperature in addition to the triclinic modification and that the monoclinic modification transforms to a triclinic one on cooling.
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Hidenobu Hori, Norimichi Kojima, Hiroshi Nishimura, Ikuji Tsujikawa, K ...
1986 Volume 55 Issue 4 Pages
1380-1383
Published: April 15, 1986
Released on J-STAGE: May 29, 2007
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Optical spectrum of
R′-band at 13705 cm
−1 in YbCrO
3 is observed in high magnetic field up to 511 kOe. When the field is parallel to the
c-axis, usual linear Zeeman splitting is found in the low field region. However, the splitting above 300 kOe decreases with increasing the field and an amalgamated absorption band is observed above 400 kOe. Origin of the anomalous Zeeman effect is explained by the spin reorientation. The reorientation field observed in this crystal is much higher than those of the other orthochromites.
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Jun-ichi Igarashi, Takashi Nakano
1986 Volume 55 Issue 4 Pages
1384-1391
Published: April 15, 1986
Released on J-STAGE: May 29, 2007
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A theory is presented for the resonant photoemission of insulators. Interference effect between the direct valence electron excitation and the core-electron excitation followed by the super Coster-Kronig transition is examined. Our previous theory is extended to include the hybridization of the valence state to the conduction band. It is shown that the satellite intensity persists far below the core-level photothreshold and exhibits a Fano type antiresonance, in agreement with the recent experiment of copper halides by Ishii
et al.
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Takayasu Tanaka
1986 Volume 55 Issue 4 Pages
1392-1399
Published: April 15, 1986
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In nonlinear capacitors, inductors and resistors, general equations holding among the voltages and currents at different frequencies are derived. These are obtained only on the assumption that the characteristics for the nonlinear elements are single-valued. The well-known Manley-Rowe relation is the lowest order and simplest ones among these equations. But, even then, the relations are more extensive, in the sense that the number of the voltage generators may be arbitrary.
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Masasi Inoue, Mikio Koyano, Hiroshi Negishi, Yoshifumi Ueda
1986 Volume 55 Issue 4 Pages
1400-1401
Published: April 15, 1986
Released on J-STAGE: May 29, 2007
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Yoshio Sakai, Noboru Kimizuka, Takahiko Mohri, Nobuo Tsuda
1986 Volume 55 Issue 4 Pages
1402-1403
Published: April 15, 1986
Released on J-STAGE: May 29, 2007
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