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Masaki Hayashi, Saburo Homma, Kazuo Katsuura
1980 年 49 巻 6 号 p.
2093-2102
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
The numerical calculations of the momentum spectra and
xF distributions of the leptons from the decay of
W± and
Z0 produced in the reactions (
Remark: Graphics omitted.) and (
Remark: Graphics omitted.) for c.m. energies from 200 GeV to 600 GeV are presented. The formulas used in the calculations are derived within the Weinberg-Salam model by using the QCD perturbation theory to
O(α
s). Two different forms for scale violation of the parton distributions, and two forms for the total widths of the
W± and
Z0 which depend on the number of flavors of quarks and leptons (
Nf=4 and 6), are taken into accounts in the calculation. The results show the characteristic peak in the momentum spectrum which indicates the
W± or
Z0 production.
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Hiroyasu Ejiri, Yasuki Nagai, Hideyuki Sakai, Tokushi Shibata, Tadafum ...
1980 年 49 巻 6 号 p.
2103-2113
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
Pre-equilibrium deexcitation process for the
164Dy(α,
xnγ) reaction at
Eα=90 MeV was studied by means of γ-γ and neutron-γ coincidence method. Properties of the preequilibrium phase were deduced as a function of the neutron multiplicity
x. The reaction process was analyzed in terms of the two-phase deexcitation process, the pre-equilibrium phase with the energy parameter (quasi-temperature) of
kTp=5 MeV and the equilibrium phase with the temperature of
kTe=1.2 MeV. Angular momenta removed by the decaying neutrons at the pre-equilibrium and equilibrium phases, together with the data of the γ-ray multiplicity, account for the angular momenta introduced by the projectile.
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Yohsei Iwata
1980 年 49 巻 6 号 p.
2114-2121
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
Relative intensities of gamma rays of
156Gd from the decays of
156Eu and
156Tb were measured precisely with a calibrated Ge(Li) detector. Errors of relative intensities for strong gamma rays are about 0.5%. Ratios of reduced
E2-trarnsition probabilities in
156Gd were deduced from the relative gamma-ray intensities. A perturbation band-mixing treatment was applied for the first excited
Kπ=0
+ and
Kπ=2
+ rotational bands but the
B(
E2) ratios were not satisfactorily explained.
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Ravinder Kaur, A. K. Sharma, S. S. Sooch, P. N. Trehan
1980 年 49 巻 6 号 p.
2122-2128
発行日: 1980/12/15
公開日: 2007/05/29
ジャーナル
認証あり
The level structure of
140Ce has been studied in detail in the present work. The energies and relative intensities of 37 gamma rays following the β
− decay of
140La have been measured with a high precision. A new gamma ray has been observed at 1303.3 keV energy and has been placed between 2899.5 and 1596.17 keV levels of
140Ce. Also, a new level has been proposed at 3000.7 keV in order to fit 1097.2 and 1404.9 keV gamma rays in the level scheme of
140Ce. All but two gamma rays with energies 1045.0 and 1924.4 keV have been placed in the decay scheme.
In addition γ-γ angular correlation measurements have been carried out on nine cascades. Spin assignments of 4
+ and 1
+ have been confirmed to the levels at 2515.71 and 2547.15 keV from the present directional correlation measurements. Also, multipole mixing ratios in the 329, 432, 487, 752, 816, 868, 919, 925 and 951 keV γ-transitions have been measured.
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Yasuaki Hiwatari, Akira Ueda
1980 年 49 巻 6 号 p.
2129-2135
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
A simple version proposed in our previous paper for superionic conductors is applied to superionic CaF
2. That is, the model potential between ions is composed of only the soft-core and the Coulomb potentials. Monte Carlo calculations were performed with a fine-grained lattice for 324- and 96-ion systems at several temperatures for a constant density. It is found that as the temperature increases the fractional number of anions in the tetrahedral locations shows a drop in the magnitude in a narrow temperature range, while the fraction of anions in the octahedral locations shows a featureless smooth increase, the increase of the diffusion is gradual, and the transition is like second-order (no latent heat). A rather largely system-size-dependent result on the fluctuations of potential energies is remarked in the superionic phase.
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Yuichi Okuda, Isao Yamada, Jun Watanabe, Taiichiro Haseda
1980 年 49 巻 6 号 p.
2136-2140
発行日: 1980/12/15
公開日: 2007/05/29
ジャーナル
認証あり
The measurement of susceptibility in the randomly diluted two-dimensional Heisenberg-like ferromagnet K
2Cu
xZn
(1−x)F
4 is performed for the concentrations (
x=0.68, 0.60, 0.50 and 0.40) near the percolation threshold, which is calculated as 0.59 for the square lattice with the nearest-neighbor interaction. The susceptibility for
x=0.60 is excellently described by the exact solution of the one-dimensional
S=1⁄2 Heisenberg ferromagnet with the same g-factor and the same exchange interaction as the original values of K
2CuF
4. The susceptibility for
x=0.40 exhibits the Curie law with a slight deviation in the low temperature region.
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Masayoshi Azuma
1980 年 49 巻 6 号 p.
2141-2143
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
Energy bands of the crystalline Argon have been calculated with a potential based upon the Ewalt potential by MS method. Effects of the virial theoretical α were included in the core charge density. For the crystal, α was increased gradually up to 1 in the course of the self-consistent energy band calculation. The best band gap is obtained with α=1. Electron affinity was improved by about 2 eV.
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Akio Kotani, Saburo Takahashi, Masashi Tachiki, Tomio Koyama, Hideki M ...
1980 年 49 巻 6 号 p.
2144-2151
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
Effective interaction between localized magnetic moments in ferromagnetic superconductors is studied microscopically by taking account of the interplay among the electromagnetic field, persistent current and magnetic moments. The obtained effective exchange coupling
Jij(
q) can stabilize the spin-spiral ordering with a finite wave number
Q, which coexists with superconductivity. By using this
Jij(
q), the spin wave spectrum hω
q in the spin-spiral state is calculated at zero temperature. Reflecting a characteristic anisotropy of
Jji(
q), hω
q depends strongly on the direction of
q; for
q⁄⁄
Q it has a prominent peak at
q∼
Q, but the peak vanishes as
q deviates from the
Q direction. It is also shown that hω
q has many energy gaps characteristic of the magnetic superconductor.
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Mitsuru Tanimura, Norikiyo Uryû
1980 年 49 巻 6 号 p.
2152-2158
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
For a two-sublattice uniaxial Néel-type antiferromagnet, the stable spin configurations at the zero-temperature under an external magnetic field of arbitrary direction within a particular plane are studied in the nearest neighbor spin-coupling approximation. Particularly, the effects of single ionic anisotropy
D-term and anisotropy in the exchange interactions on the magnetic phases are investigated. As a result, it has turned out that the antiferromagnetic state appears only for the external magnetic field along the easy axis of sublattice magnetization and shows a first-order phase transition to the canted-spin state for
D<
D0 or directly to the ferromagnetic state for
D≥
D0 where
D0=0.5|
J|
z0 with the exchange integral
J and the number of nearest neighbors
z0. For other field directions, no antiferromagnetic state appears and only the second-order phase transition between the canted-spin and ferromagnetic states occurs. The critical field as a function of external field direction has been calculated for several
D-values.
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Takeshi Hiraoka
1980 年 49 巻 6 号 p.
2159-2164
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
Magnetization and extraordinary Hall effect (EHE) were measured on forrimagnetic compounds Er
1−xY
xFe
2 with
x=0, 0.32, 0.42, and 0.58 from 77 K to 650 K (530 K, for EHE). The magnetization measurements showed almost good agreement with the work previously reported. EHE for all the samples showed positive sign (hole like) above compensation point
Θc, and generally showed sign change at
Θc, but this change became less clear as Y concentration increased.
The magnetization was calculated by the molecular field approximation which reproduced fairly well the measured ones. Using these data, temperature dependence of EHE was calculated and compared with the measured ones. The agreement between them was generally good. From the analysis of the observed EHE, it was shown that the moments of Er and Fe sublattices contributed to the EHE independently.
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Kazuo Yamagata, Tooru Sakai
1980 年 49 巻 6 号 p.
2165-2172
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
Magnetization process is studied theoretically on the basis of the 4-sublattice hamiltonian obtained by adding a weak interlayer exchange to the 2-sublattice hamiltonian introduced by Seehra, and Castner. Equations of torque balance derived by applying the molecular field approximation at
T=0 are truncated by neglecting smaller terms. The resulting simplified equations are solved analytically or numerically and the magnetization curve is obtained. The result indicates that the unique mangetization process of these salts is attributable to the field-induced transition from a 4- to a 2-sublattice state which is related closely to the 2-dimensionality of the crystal. The jumping field for
H⁄⁄b is given approximately by twice of the interlayer exchange field divided by the a″b-element of the effective g-tensor.
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Tetsuhiko Okamoto, Hironobu Fujii, Kohji Eguchi, Hiroshi Fujiwara
1980 年 49 巻 6 号 p.
2173-2178
発行日: 1980/12/15
公開日: 2007/05/29
ジャーナル
認証あり
Measurements of the magnetization and the magnetic susceptibility have been made along the principal axes of Tb–Sm single crystals. The alloys exhibit a ferromagnetic structure at low temperatures in the composition region up to 50 at% Sm and screw-antiferromagnetism appears in the sequence of increase of temperature in the compositions less than about 10 at% Sm. In Sm-rich alloys, the magnetic structure is presumably a Sm-type which has two magnetic transition temperatures
T1N and
T2N. The temperature difference between
T1N and
T2N2 decreases with decreasing Sm concentration. The magnetocrystalline anisotropy constants
K20 and
K20para were determined from the analyses of the magnetization curves at 4.2 K and anisotropic paramagnetic Curie temperature, respectively.
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Masahiro Matsumura, Takao Kohara, Kunisuke Asayama
1980 年 49 巻 6 号 p.
2179-2182
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
Nuclear spin-lattice relaxation time,
T1, of various non-transition element impurities in ferromagnetic Fe and Ni has been measured. The measured values were compared with those calculated by Yoshida, Terakura and Kanamori, which predicts the systematic change of
T1 against the valence number of non-transition impurities. The agreement between the experimental and theoretical values is satisfactory not only in the systematic variation but in the magnitude except In impurity in Fe. As a whole, the present experiment supports the theoretical results.
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Akito Kakizaki, Hidenao Sugawara, Ichiro Nagakura, Takehiko Ishii
1980 年 49 巻 6 号 p.
2183-2190
発行日: 1980/12/15
公開日: 2007/05/29
ジャーナル
認証あり
The valence band photoelectron spectra of MnP crystals have been measured over the range of excitation energy from 40 to 130 eV using synchrotron radiation. The spectra consist of strong bands ascribable to the Mn 3
d bands and weak structures ascribable to the P 3
s band and the bonding bands of Mn 3
d and P 3
p electrons. Sharp Fermi edge is found in the Mn 3
d band; the consequence is that Mn 3
d electrons are itinerant. The spectral band shape is consistent with the results of energy band calculation reported recently. Resonance enhancement of the photoemission intensity accompanied by the growth of two additional band is found for excitation energies above the threshold of Mn 3
p excitation. The possible origin of this enhancement is discussed.
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Haruki Toda, Yasuaki Nakagawa
1980 年 49 巻 6 号 p.
2191-2197
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
The Faraday effect in Gd
3Fe
5O
12, Y
3Fe
5O
12, Y
3Ga
xFe
5−xO
12 (
x=0.272) and Y
3−xBi
xFe
5O
12 (
x=0.5) has been measured at a wavelength of 632.8 nm in magnetic fields up to 45 kOe in a temperature range between 100 and 700 K through the Curie temperature. The Faraday rotation shows a remarkable decrease proportional to the applied field after the magnetization is saturated. The proportionality coefficient depends on temperature in the same manner as a linear combination of squares of sublattice magnetizations. An attempt is made to elucidate the field dependence of the Faraday effect on the basis of an electronic transition in Fe ions.
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Yosiaki Tino, Yukihiro Nakaya
1980 年 49 巻 6 号 p.
2198-2202
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
As is well known, application of tension or pressure to the Invar alloys brings about unusually large increase or decrease of their magnetization. In the present paper, the origin of this phenomenon was studied under various values of tension in one direction for the γ-phase Fe–Ni Invar alloys.
The magnetization in the para-process and X-ray spectra were measured under increasing and then decreasing tension, and their reversible or irreversible behavior was examined; consequently, a tendency of structural change from the γ-phase toward the α-phase was found out. Thus it was concluded that the anomalous magnetoelastic effect which is one of the characteristics of the Invar alloys may depend largely upon some incomplete lattice transformation between the γ- and α-phases.
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Kiyoshi Shizuma, Masato Nishi, Toshiaki Fujita, Yasukazu Yoshizawa
1980 年 49 巻 6 号 p.
2203-2207
発行日: 1980/12/15
公開日: 2007/05/29
ジャーナル
認証あり
Doppler broadening of the positron annihilation in LiH, NaH, LiF and NaF were measured with a Ge(Li) detector. The annihilation radiation spectra were observed up to higher momentum regions and an influence of the positive ions on the momentum distribution was investigated. It was shown that the distribution of LiF is broader than that of NaF, but the higher momentum regions of them are almost the same. The distribution of NaH is slightly narrower than that of LiH, but both distributions are narrower than those of LiF and NaF. The momentum distributions were decomposed into two or three components and the interference term was discussed.
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Shuichi Iwabuchi
1980 年 49 巻 6 号 p.
2208-2218
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
The model which describes essential aspects of three successive structural phase transitions in TTF–TCNQ is introduced. The effects on the dynamical properties of the system caused by the three dimensional ordering is studied based on the model. Energy spectra of excitations, conductivities and dielectric constants in low temperature ordered phases are calculated. It is shown that conductivities and dielcetric constants are determined by the optical phase modes whose gap energies (“pinning energies”) reflect structural details of the ordered phases; the dc conductivity becomes zero even in the absence of impurity etc., and below the third transition temperature large microwave dielectric constant is obtained with anomalous behavior as experimentally reported.
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Tatsuro Miyasato, Masao Tokumura, Minoru Toguchi, Fumio Akao
1980 年 49 巻 6 号 p.
2219-2226
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
The magnetic field effect on acoustic attenuation in lightly Sb-doped Ge was measured at liquid He temperatures under uniaxial stress. The direction of the uniaxial stress was in parallel with that of the magnetic field. The attenuation of 1 GHz acoustic waves was measured as a function of the magnetic field up to 60 kG under fixed uniaxial stress. The experimental results were compared with the theory, in which it is shown that the attenuation is caused by the relaxation of the system into an instantaneous local thermal equilibrium by the acoustic waves under the consideration of the influence on the donor wave function of each valley by the uniaxial stress and the magnetic field. It was found that the effect of the magnetic field is far larger than that of the present theory (i.e., the Zeeman effect).
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Toshio Ikeda
1980 年 49 巻 6 号 p.
2227-2230
発行日: 1980/12/15
公開日: 2007/05/29
ジャーナル
認証あり
Diffusion measurements have been made for Cl
2 in KCl at temperatures ranging from 550°C to 750°C. The experimental procedure is the same as has been previously used for the diffusion of Br
2 in KBr. The activation energy of the diffusion is 1.82±0.12 eV and shows the apparent agreement with the theoretical estimates by Diller based on the vacancy-pair mechanism. The activation energy of the solution of Cl
2 at the surface is −0.48±0.17 eV. This shows the exothermic reaction of Cl
2 at the surface of KCl in contrast with the endothermic reaction of Br
2 at the surface of KBr.
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Sumitada Asano, Nobuhiko Yamashita
1980 年 49 巻 6 号 p.
2231-2235
発行日: 1980/12/15
公開日: 2007/05/29
ジャーナル
認証あり
Emission and excitation spectra of MgS: Sb
3+ phosphors are measured at various temperatures. In addition to the
A,
B and
C excitation bands peculiar to Tl
+-type ions, three bands corresponding to charge transfer transitions are observed. On each excitation band, distinct Jahn-Teller splitting is observed and the phonon structure appears on the
B band. The energy parameters for Sb
3+ centers in MgS are determined from the excitation spectra.
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Yasuaki Masumoto, Shigeo Shionoya
1980 年 49 巻 6 号 p.
2236-2242
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
The three-wave mixing process has been studied as functions of incident photon energy and also of the geometrical configuration when incident photon energy lies around the two-photon resonance of excitonic molecule. Experiments indicate that the intensity of the third order nonlinear light beam is enhanced when the phase matching condition derived from the dispersion of excitonic polariton holds or when incident photon energy is equal to the two-photon resonance of excitonic molecule. The relation between this three-wave mixing process and two-photon resonant Raman scattering so far observed is discussed. It is shown that this three-wave mixing process is regarded as the two-photon resonant, coherent Raman scattering via excitonic molecules.
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Yasuo Takakusa, Toshio Hyodo
1980 年 49 巻 6 号 p.
2243-2247
発行日: 1980/12/15
公開日: 2007/05/29
ジャーナル
認証あり
Positron annihilation 2γ angular correlation curve of NaF has been measured at temperatures ranging from 4.5 K to 300 K. The temperature dependence of the narrow peaks originating from the self-annihilation of singlet positronium (Ps) is analysed. In the lower temperature region, the peak width increases in a rate that shows the Ps is in free state with the effective mass 1.5±0.2 times heavier than the bare mass. At temperatures higher than 150 K, the peak width increases more rapidly than in the lower temperature region, which indicates that a number of the Ps are trapped in some localized state.
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Toshio Hyodo, Jun-ichi Kasai, Yasuo Takakusa
1980 年 49 巻 6 号 p.
2248-2254
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
Recently observed anomalous temperature dependence of the width of the positronium peak in NaF is interpreted in terms of metastably self-trapped positronium. Analysis of the data indicates that there exists metastable self-trapped state of positronium at about 0.1 eV above the ground state of free positronium.
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Yoshihiro Goto, Etsuro Sawaguchi
1980 年 49 巻 6 号 p.
2255-2262
発行日: 1980/12/15
公開日: 2007/05/29
ジャーナル
認証あり
Dielectric and elastic properties of RbH
3(SeO
3)
2 and the ferroelectric domain structure have been investigated around the transition point of
Tc=−117°C. In contrast to the previous results, no evidence of occurrence of an intermediate phase around
Tc has been found; and only one sharp ferroelectric transition occurs at
Tc. The contrasting result seems to be due to mainly a difference of origins of sample crystals: occasionally as-grown RbH
3(SeO
3)
2 crystals are not of homogeneous quality and contain such portions that neither reveal a clear domain structure nor exhibit a well defined ferroelectric
D-
E hysteresis loop. Such specimens usually show several anomalies in the dielectric and elastic constants around −117°C. Thus the anomalies are apt to be misinterpreted as representing successive phase transitions. A need of special care in selecting a homogeneous specimen is disclosed.
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Kiyoyasu Imai
1980 年 49 巻 6 号 p.
2263-2269
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
The spontaneous polarization
P(
t) of tri-glycine sulfate was measured in a range 90 K to 323 K by the pyroelectric and the
D-
E loop method. A non-classical critical-exponent, β=0.45±0.02 was observed in the region −9.3<ln (−
t)<−6.8, where
t≡(
T−
TC)⁄
TC and
TC\simeq322 K. Mean field analyses taking account of electroelastic coupling revealed that a distinct deviation from the classical behavior of
P0(
t) exists in the region ln (−
t)\lesssim−5. Normalization [
P(
t)⁄
P0(
t)]
3 can be approximately expressed by the correction term
L·ψ(
L), where
L=1+3
b ln
t0⁄2|
t| and ψ(
L) is the term for free crystals. In the region −8.3<ln (−
t)<−6.1,
b=0.027 and
t0=0.009 are obtained. The critical amplitude and region, and the correlation lengths were estimated according to Nattermann.
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Hiroyuki Mashiyama
1980 年 49 巻 6 号 p.
2270-2277
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
On the basis of a model free energy, mechanisms of the successive transitions from a normal phase to an incommensurate one, a commensurate one and finally to some low temperature phases are investigated. The free energy consists of terms of six physical quantities, and is invariant in the normal phase
Pmcn. It is shown that the incommensurate phase transforms to the commensurate ferroelectric phase with fivefold cell-length. Further the temperature is decreased, then a triple cell-length phase is realized. The present model is appropriate for {N(CH
3)
4}
2ZnCl
4 and {N(CH
3)
4}
2CoCl
4, for example, and differs from those proposed for K
2SeO
4 and the isomorphous materials.
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Katsumi Hamano, Yoshito Ikeda, Takayuki Fujimoto, Kenji Ema, Shunsuke ...
1980 年 49 巻 6 号 p.
2278-2286
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
Measurements were made of the dielectric constant along the ferroelectric axis ε
a, the spontaneous polarization
Ps and the heat capacity
cp of Rb
2ZnCl
4 crystals in the temperature range from −150°C to 150°C. The normal-incommensurate transition point determined as the peak position of
cp lies at 30.1°C, which is about 6°C lower than the temperature for the maximum of ε
a. It was found that ε
a and
Ps show a characteristic thermal hysteresis over a wide temperature range including the incommensurate-commensurate transition point (−80°C). The thermal hysteresis occurs even when heating and cooling runs are cycled within the incommensurate phase. The observed thermal hysteresis is understood if we assume that defects such as impurities act as obtacles to diffusion of discommensurations and prevent the crystal from reaching thermal equilibrium.
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Akira Sakai, Itaru Tatsuzaki
1980 年 49 巻 6 号 p.
2287-2295
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
Raman Spectra of RbH
3(SeO
3)
2 are studied in the region 0–120 cm
−1 over a wide temperature range on several geometries. Two soft-modes at 28 cm
−1 (
A-symmetry) and 32 cm
−1 (
B-symmetry) are observed. Two broad plateau responses (
A- and
B-symmetries) appear between the central Rayleigh component and about 30 cm
−1 and show maximum at the phase transition temperature. The plateaus are strongly coupled to the soft-modes. In the ferroelectric phase, there are hard-modes which are derived from zone-boundary modes of the paraelectric phase. These hard-modes are also obtained above the transition temperature as very weak and damped lines. In the vicinity of the transition temperature, both the intensity and linewidth of the zone-boundary hard-mode change remarkably. This behavior is essentially attributed to the two-phonon scattering concerned in the soft and hard-modes.
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Hiroshi Ohkura, Kiyokazu Iwahana, Masaji Tanaka, Katsushi Tara, Koichi ...
1980 年 49 巻 6 号 p.
2296-2304
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
Magnetic circular polarization (MCP) of
F center emission has been measured for KCl, KBr, KI, RbCl, and RbBr. The optical pumping cycle is proposed to include three spin mixing parameters in absorption, radiationless decay (ε
r1), and emission processes. From the analysis of experimental data using formulae derived from rate equations for the cycle, para- and dia-magnetic components (
Δp and
Δd) of MCP, and the spin mixing parameters are determined. Pumping photon energy dependence of
Δp are observed. It shows that ε
r1 for KBr depends on photon energy and predominates the net spin mixing parameter (ε
t). Temperature dependence of
Δd are shown to be relevant to the spin orbit interaction in the relaxed excited state of
F center. The source of the discrepancy found between our determined values of ε
t and those by other schools is clarified.
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Shunsuke Nakanishi, Takao Muramoto, Osamu Tamura, Tsuneo Hashi
1980 年 49 巻 6 号 p.
2305-2313
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
We have found that the amplitudes of the optical FID, two-pulse photon echoes and stimulated photon echoes in ruby measured as a function of applied magnetic field exhibit sharp increases at the magnetic fields where two Zeeman splittings in the ground state
4A2 or in the excited state \bar
E(
2E) are harmonically related. The phenomena are confirmed to be inherent in the Stark (or frequency) switching experiment where the sample is subjected to the cw irradiation, and the origin of the sharp increases be the change of the steady state population in
4A2 of the nonresonant Cr ions caused by a combined action of the cw optical pumping and the spin-spin cross relaxation. The mechanism involved is successfully explained by the analysis based on the rate equations.
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Hideo Onuki, Fuyuhiko Sugawara, Masahiro Hirano, Yuji Yamaguchi
1980 年 49 巻 6 号 p.
2314-2316
発行日: 1980/12/15
公開日: 2007/05/29
ジャーナル
認証あり
UPS spectra of perovskite fluorides KMF
3(M: Mn, Fe, Co, Ni, Cu, Zn) were measured in the valence band region. The calculation, fitted to the observed spectra, of M 3
dn−1 multiplets including the ligand field was made, and relative energy positions of the
eg and
t2g one electron states of up- and down-spins together with those of
pσ and
pπ valence bands were determined. The effect of
eg-
pσ mixing in KZnF
3 seems appreciable.
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Teruaki Minagawa
1980 年 49 巻 6 号 p.
2317-2318
発行日: 1980/12/15
公開日: 2007/05/29
ジャーナル
認証あり
Structural polytypism in SnS
2 and SnSe
2 crystals grown by a chemical transport reaction and from a melt was studied by the X-ray diffraction method with a Weissenberg camera. It was revealed that in each of SnS
2 and SnSe
2 the type 18
R with the Zhdanov symbol (1212)
3 and space group
R\bar3
m is the most or second common polytype.
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Michi-hiko Mannami, Kenji Kimura, Akira Kyoshima, Mitsuyoshi Matsushit ...
1980 年 49 巻 6 号 p.
2319-2325
発行日: 1980/12/15
公開日: 2007/05/29
ジャーナル
認証あり
Planar channelling of MeV H
+ and He
+ ions was studied using phosphorus implanted silicon crystals with a well-defined network of edge dislocations. The energy dependence of dechannelling at dislocation is shown to be proportional to the square root of the energy of the ion. The dechannelling processes of energetic charged particles at extended dislocation are discussed.
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Kazuhiro Nozaki
1980 年 49 巻 6 号 p.
2326-2330
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
A nonlinear mechanism is considered for the excitation of magnetostatic modes by drift Alfven waves in an inhomogeneous plasma. The parametric instability growth rates corresponding to this process are determined. It is shown that magnetic islands are formed to extend along the equi-density surface.
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Kunihiro Sato, Ryohei Itatani, Hiromu Momota
1980 年 49 巻 6 号 p.
2331-2339
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
An excitation of flute-type negative-energy ion-cyclotron waves by means of an ion gradient-
B drift is analyzed on the basis of the linearized local dispersion relation. The excitation mechanism of these negative-energy waves is found to be a kind of an ion-cyclotron damping. This instability occurs even in axially homogeneous plasmas, and is still not stabilized even at a radial scale length large enough to stabilize the DCLC (drift-cyclotron loss-cone) instability. This instability is stabilized in the same way as the DCLC instability by an addition of a warm plasma.
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Takashi Ohsawa
1980 年 49 巻 6 号 p.
2340-2348
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
A nonlinear theory is presented which shows mode-locking of a naturally excited instability by an externally launched wave whose frequency is around that of the instability. A procedure to remove secular solutions leads to a couple of nonlinear equations which describe slow-time evolutions of amplitudes. A stably stationary solution of these equations is investigated to show qualitative agreement with published experiments; the external field strength at which the instability vanishes increases as the frequency discrepancy between the instability and the external wave |
Ω-ω
0| increases, and a relation
Aa2+
Bb2=1 is obtained between the amplitude of the instability
a and that of the externally excited wave
b where the ratio B/A depends on the frequency discrepancy in the form (
Ω-ω
0)
−2.
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Mitsuhiro Nambu
1980 年 49 巻 6 号 p.
2349-2356
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
The cooling rate of the effective electron temperature due to the induced bremsstrahlung radiation is estimated in the presence of the ion wave turbulence. The total power of the induced bremsstrahlung radiation is obtained.
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Ikuo Ikeda, Beonguk Cheon, Hideo Akimune, Kenji Watanabe
1980 年 49 巻 6 号 p.
2357-2363
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
It is found that there is a plasma loss from the toroidal divertor equipped in Mirror-Torus-System-1, which is composed of two simple mirrors, four toroidal divertors and two
U-bends without the rotational transform. The loss in the divertor is investigated from the point of the plasma density profiles in the down stream side of the divertor in comparison with that of the up stream plasma. The loss is estimated to be 20% of plasma flowing into the divertor. This value is explained from what the Pfilsch-Schlüter current flowing in the azimuthal direction in the divertor enhances the radial flow of plasmas.
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Kazuya Uehara, Hiroshi Takeuchi, Tsuyoshi Imai, Takumi Yamamoto, Tsune ...
1980 年 49 巻 6 号 p.
2364-2370
発行日: 1980/12/15
公開日: 2007/05/29
ジャーナル
認証あり
Power absorption rate of lower hybrid wave by ions has been estimated by the convection, conduction loss and the charge exchange loss both in the main plasma region and in the boundary region of a circular tokamak. It is shown that when an effective ion heating is performed in the main plasma region the rf power is not dissipated in the boundary region through the parametric decay instabilities. The rate of the dissipated rf power in the boundary region saturate at relatively low power level and does not give the fatal effect on the ion heating in the main region if we select an appropriate plasma parameters.
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Mitsuaki Funakoshi
1980 年 49 巻 6 号 p.
2371-2379
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
Initial-value problem of two-dimensional reflection of solitary waves in shallow water is studied with a finite-difference method. If α>\sqrt3ε (α=the angle of incidence, ε=
a⁄
h,
a=wave amplitude,
h=undisturbed depth), the solution represents a regular reflection pattern which is composed of incident and reflected waves. On the other hand, if α<\sqrt3ε, a Mach reflection pattern which consists of three obliquely oriented solitary waves is obtained as an asymptotic solution. This solution agrees very well with the resonantly interacting solitary wave solution predicted by Miles. The run-up at the wall is considerably larger than that in linearized theory when α is close to \sqrt3ε, and this result is consistent with that predicted by Miles. It requires the time of order 100
h⁄\sqrt
ag (
g=gravitational acceleration) to reach stationary Mach reflection patterns when ε=0.05.
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Akira Nakamura
1980 年 49 巻 6 号 p.
2380-2386
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
Backlund transform of the cylindrical KdV equation,
ut+6
uux+
uxxx+
u⁄2
t=0, has been studied. Superposition formula and the proof of the commutability of the transformation are rigorously given. This enables us to produce multiple soliton solutions of the cylindrical KdV equation.
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Moon-Uhn Kim
1980 年 49 巻 6 号 p.
2387-2391
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
Two-dimensional slow viscous flow around a vertical fence on a plane is investigated on the basis of the Stokes approximation. An exact formal expression of the stream function is obtained by use of the Wiener-Hopf technique. From the formal expression obtained, the flows near the corner and the leading edge of the fence are discussed. Pressure distributions on plane boundaries are also given.
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Shunichi Wakitani
1980 年 49 巻 6 号 p.
2392-2399
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
Linear stability theory is applied to laminar natural convection plumes arising from a point heat source for Prandtl numbers of 2 and 0.7 (air). The axisymmetric steady plume which has a boundary-layer structure is used as the basic flow. The stability equations which include the effect of velocity-temperature disturbance coupling are numerically solved for both axisymmetric and non-axisymmetric disturbances. The axisymmetric mode is found to be stable. The non-axisymmetric mode
n=1 is found to be unstable but
n=2 stable, where
n is the azimuthal wave-number of the non-axisymmetric disturbance.
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Ken-ichi Kusukawa, Yô Shimizu, Akira Shinoda
1980 年 49 巻 6 号 p.
2400-2406
発行日: 1980/12/15
公開日: 2007/05/29
ジャーナル
認証あり
The steady secondary flow due to a circular cylinder oscillating rotationally around an eccentric axis in a fluid at rest is analyzed by the boundarylayer approximation. The boundarylayer equation is solved by the method of successive approximation. The pattern of streamlines obtained theoretically depends strongly on the Reynolds number. This fact is in good agreement with the experiment qualitatively at least. The theory shows that in the neighbourhood of the body the direction of the secondary flow changes according to the Reynolds number.
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Tsutomu Kawata, Jun-ichi Sakai
1980 年 49 巻 6 号 p.
2407-2414
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
We obtained a generalized Gel’fand-Levitan equation to analyse the structure of nonlinear equations derived from the Kaup-Newell eigenvalue problem. This G–L equation is used to get a functional which maps a variation of scattering data to the one of potentials. From the comparison of this functional and the inverse one, the completeness of squared eigenfunctions is naturally derived. A Green function is defined for a linear partial-differential equation corresponding to the first variational system of the derivative nonlinear Schrödinger (DNLS) equation and we get the solution of a nonhomogeneous linear equation which arises in perturbations around the DNLS equation.
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Ichiro Hatta, Hironobu Ikeda
1980 年 49 巻 6 号 p.
2415
発行日: 1980/12/15
公開日: 2007/05/29
ジャーナル
認証あり
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Bijay Krishna Chaudhuri, Tooru Atake, Suvra Ganguli, Hideaki Chihara
1980 年 49 巻 6 号 p.
2416
発行日: 1980/12/15
公開日: 2007/06/01
ジャーナル
認証あり
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H. Vogt, G. Neumann
1980 年 49 巻 6 号 p.
2417-2418
発行日: 1980/12/15
公開日: 2007/05/29
ジャーナル
認証あり
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Kenichi Kojima, Tadamiki Hihara, Takahiko Kamigaichi
1980 年 49 巻 6 号 p.
2419-2420
発行日: 1980/12/15
公開日: 2007/05/29
ジャーナル
認証あり
The
153Eu NMR and differential susceptibilities of EuSe
1−xS
x with 0≤
x≤0.3 have been measured as a function of temperature. The antiferromagnetic NNSS-type phase of EuSe is stabilized by substituting a small amount of sulfur (
x<0.1). The specimens with
x≥0.2 are ferromagnetic, and those with 0.1≤
x<0.2 are in the region for the coexistence of the NNSS and ferromagnetic phases.
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