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Masatoshi Koshiba
1980 Volume 48 Issue 1 Pages
1-3
Published: January 15, 1980
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Based on the existing experimental data it is suggested that one can raise a serious doubt about the validity of Lorentz transformation for those processes in which high energy quarks interact with the hadronic sea.
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Eisuke Minehara, Shiroh Mitarai
1980 Volume 48 Issue 1 Pages
4-15
Published: January 15, 1980
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Energy levels of
95Tc have been investigated by means of the
95Mo(p, nγ) reaction. Excitation functions of γ-ray yields were measured with a Ge(Li) detector in the bombarding energy range from 2.8 MeV to 5.1 MeV in steps of 10 keV to 100 keV. The decay scheme which includes 40 levels and 104 γ rays has been constructed from the comparisons of the 1st 2
+ and the 2nd 4
+ isobaric analogue resonance yields, threshold energies for 88 γ rays, branching ratios, γ-ray angular distributions and systematics. Spin and parity values for the 9th, 13th and 15th excited states were assigned as 1/2
+, 9/2
− and 7/2
−, respectively. New levels at 1837.5 keV(7/2
+, 9/2
+), 1873.9 keV(7/2
+, 9/2
+), 1888.8 keV(5/2
−) and 2118.1 keV(7/2
+, 9/2
+) were also proposed. A rotation-particle-coupling model calculation has been undertaken in
95,97,99Tc isotopes. The calculation gives reasonable agreements with the experimental results.
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Hideki Hayashi, Masao Shimizu
1980 Volume 48 Issue 1 Pages
16-23
Published: January 15, 1980
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Expressions for the dynamical dielectric function and dynamical paramagnetic spin susceptibility of the electron gas at metallic densities are derived by applying the approximation of Schneider
et al. for the decoupling of the classical two-body distribution function to the previous theory of Hasegawa and Shimizu, where Wigner’s quantum distribution function was used. By means of the fluctuation-dissipation theorem, the self-consistent equations for the dielectric function and dynamical susceptibility are obtained. The numerical results of the pair correlation function, the correlation energy, the structure factor, the compressibility and the spin susceptibility are shown and are compared with the previous results. It is shown that the compressibility sum rule is almost exactly satisfied at all metallic densities.
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Ikuo Ono
1980 Volume 48 Issue 1 Pages
24-32
Published: January 15, 1980
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Phase transitions of Ising model on a tree-like lattice having looped interactions are theoretically investigated. Concentration dependences of transition temperatures to a ferromagnetic ordered phase are rigorously obtained for several binary random-bond mixtures. For dilute ferromagnets magnetization, energies, spin-pair correlations, specific heats and susceptibilities have been evaluated in the ordered phase as well as in the paramagnetic phase. Spatial distributions of local magnetizations are estimated.
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Shigeru Nakamura, Shigeharu Kabashima, Tatsuyuki Kawakubo
1980 Volume 48 Issue 1 Pages
33-36
Published: January 15, 1980
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We have measured the wave number spectrum of dissipative structures in nematic liquid crystals MBBA which undergo successive hydrodynamic instabilities in external electric field. The transition to turbulence is preceded by two successive stationary modes; the first of these corresponds to the two dimensional flow (Williams domain), and the second to the three dimensional flow (grid pattern). The spectrum for the turbulent state is found to obey the Kohogorov’s −5⁄3 power law.
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Kazusige Nomura, Shun-ichi Kobayashi, Wataru Sasaki
1980 Volume 48 Issue 1 Pages
37-41
Published: January 15, 1980
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NMR measurement was done in Al small particles in high magnetic field (<36 kOe) and at low temperatures (>0.5 K). The Knight shift varied linearly with temperature and the spin-lattice relaxation time was much longer than that in bulk material. The effects of the superconductivity and the level quantization are discussed and the observed anomalies are attributed mainly to the latter.
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Hideki Yoshizawa, Koji Ubukoshi, Kinshiro Hirakawa
1980 Volume 48 Issue 1 Pages
42-49
Published: January 15, 1980
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In order to investigate the two-dimensionality and the easy plane anisotropy, the spin waves propagating along the [h, 0, 0], [h, h, 0], [h, 0.5h, 0] and [0, 0,
l] directions in CoBr
2 were observed using inelastic neutron scattering technique. The spin dynamics of CoBr
2 can be described by the anisotropic exchange Hamiltonian for
S=1⁄2 with intraplanar exchange constants
J1=2.01 meV,
J2=0.019 meV and
J3=−0.338 meV, interplanar exchange
J′=−0.97 meV, and planar anisotropies
D1=1.14 meV and
D′=−0.06 meV. As shown by these numerical values, CoBr
2 has fairly strong XY characters, but the two-dimensionality is definitely poor. We point out, however, that in a planar antiferromagnet, the easy plane type anisotropy should remove the degeneracy of the excitation spectrum for the ‘in-plane’ and the ‘out-of-plane’ correlations, and in fact, these excitations are observed separately in this experiment.
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Yuhei Natsume, Fumiyoshi Sasagawa, Masaaki Toyoda, Isao Yamada
1980 Volume 48 Issue 1 Pages
50-57
Published: January 15, 1980
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The Kubo-Tomita theory which stands on the assumption of high symmetry of the perturbation is extended so as to discuss EPR of systems with low-symmetric perturbation of dipolar interaction such as the case of TMMC, The extended formula which includes a new term arising from the one-dimensionality, of spin arrangement is developed for second cumulant of correlation function 〈
Mx(
t)
Mx(0)〉 of the magnetization. This term causes a new dynamic shift δ
H of resonance field expressed as δ
H∝−sin
2 θ(3 cos
2 θ−1) cos 2φ. (Here, θ and φ are the polar and azimuthal angles, respectively, of the chain axis in the coordinate system where the direction or static field is taken as the polar axis.) New measurements changing φ as well as θ have been performed in TMMC. Observed features coincide well with the present theoretical predictions.
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Isao Yamada, Yuhei Natsume
1980 Volume 48 Issue 1 Pages
58-61
Published: January 15, 1980
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The dynamic shift of EPR absorption line which originates from the low-symmetric spacial distribution of spins has been measured in the impure one-dimensional Heisenberg system (CH
3)
4NMn
1−xCu
xCl
3 (TMMC: Cu) with
x up to 0.045 at both 9.45 GHz and 23.65 GHz. The observed shift is enhanced in its amount when Cu concentration
x is increased, whereas the angular-behavior is similar to the case of pure TMMC. These results can be explained by the reduction of decay-rate of spin correlation function. Analysis of the experimental data on the basis of the diffusion model of impure chain reconfirms the validity of the theory of dynamic effect of low-symmetric spin-arrangement which has been previously proposed by present authors.
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Kengo Adachi, Masaaki Matsui, Yuuji Fukuda
1980 Volume 48 Issue 1 Pages
62-70
Published: January 15, 1980
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Single crystal of ordered Au
4V was prepared to reveal the intrinsic magnetic properties. The magnetizations along the three directions [100], [011] and [111] for the original fcc lattice were measured in a temperature range 4.2 K to 300 K under magnetic field up to 90 kOe. A remarkable field cooling effect of the magnetization was interpreted by a crystal and magnetic domain model. Thus the moment ca. 1 μ
B per V atom and the large uniaxial anisotropy energy, 1.52×10
7 erg/cm
3 (6.3 cm
−1 per V atom), were determined at 4.2 K. The magnetic properties of the poly and single crystals were compared. The electrical resistivities of the ordered and disordered Au
4V were measured. The origin of the anisotropy and the magnetic property were discussed on a basis of itinerant electron scheme.
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Fu Min Yang, Noboru Miura, Giyuu Kido, Soshin Chikazumi
1980 Volume 48 Issue 1 Pages
71-76
Published: January 15, 1980
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Faraday rotation and magnetization were observed for TbIG in very high magnetic fields up to the megagauss range for determining the critical field of the spin-flip transition from the collinear phase to the canted phase. The critical field was determined as a function of temperature over a wide temperature range. A large anisotropy in the critical field was observed at temperatures lower than the compensation point. The magnetic field dependence of the Faraday rotation at 1.06 μm wavelength, together with its temperature dependence were analyzed by using a formula which takes into account a linear term of the external field.
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Ichiro Hatta, Hironobu Ikeda
1980 Volume 48 Issue 1 Pages
77-85
Published: January 15, 1980
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Anomalous specific heat capacities of K
2NiF
4 family were measured with a high resolution. They were found to exhibit a symmetric logarithmic divergence as expected in two-dimensional Ising system into which the present two-dimensional anisotropic Heisenberg antiferromagnets were classified in terms of the Hamiltonian (
Remark: Graphics omitted.). The critical amplitude, \ ilde
A⁄
R was found to vary in proportion to
Δ1⁄2. In connection with this fact, the coefficient κ
0a of the inverse correlation length was found to be proportional to
Δ1⁄4. These dependences on
Δ can be understood in the frame work of anisotropic cross-over scaling hypothesis in a strong scaling case. The results predict that the crossing-over from the two-dimensional Ising to Heisenberg behavior occurs at a nonzero temperature and that the anisotropic cross-over exponent φ lies at about 4.
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Fu Min Yang, Isamu Oguro, Giyuu Kido, Noboru Miura, Soshin Chikazumi, ...
1980 Volume 48 Issue 1 Pages
86-92
Published: January 15, 1980
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Optical absorption spectra in near infrared region were measured for dysprosium iron garnet (DyIG) in a temperature range from 3.8 K to above the compensation temperature θ
c by using a superconducting magnet up to 150 kOe. Energy levels of the excited states
6H7⁄2 and
6F9⁄2 are calculated in the presence of the combined crystal and exchange fields. The peak positions corresponding to the transitions to these levels from the lowest split component of the ground state
6H15⁄2 are calculated and compared with the observed ones. By choosing the best fit value of the effective field, the agreement between theory and, experiment is fairly good as regards the overall features of spectrum.
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Masaru Kanashiro, Nobuhiko Kunitomi
1980 Volume 48 Issue 1 Pages
93-101
Published: January 15, 1980
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In order to study the local environment effect, measurements of the Mössbauer effect of Fe
57 were made for Ni
79.5Fe
20.5, Ni
75.4Fe
24.6 and Ni
69.7Fe
30.3 alloys with various degrees of long range order. We have analysed the Mössbauer pattern with 7 or 8 configurations without any assumption of the functional relation between the hyperfine field and the number of Fe atoms in the nearest neighbor shell and determined the value of the hyperfine field for each environment from which the values of the magnetic moment on Fe atoms could be deduced in a self-consistent way. The results show that the variations of the hyperfine field and the magnetic moment are not linear, especially for highly ordered alloys. This behavior is discussed in terms of the cluster CPA theory.
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Masaru Kanashiro, Nobuhiko Kunitomi
1980 Volume 48 Issue 1 Pages
102-108
Published: January 15, 1980
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In order to study the local environment effect, measurements of the Mössbauer effect of Fe
57 and Pt
195 were made for Fe
70.7Pt
29.3, Fe
71.4Pt
28.6 and Fe
75.1Pt
24.9 alloys. The Mössbauer patterns were analysed in a similar way to that described in a preceding paper. The results show that the hyperfine field and the magnetic moment on Fe and Pt atoms change non-linearly to the number of Fe atoms on the nearest neighbor shell, especially for ordered alloys.
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Makoto Yao, Masao Misonou, Kozaburo Tamura, Katsuhiko Ishida, Kazuhiko ...
1980 Volume 48 Issue 1 Pages
109-114
Published: January 15, 1980
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The electrical conductivity σ and the thermoelectric power
S have been measured for liquid Te–Se mixtures in a wide temperature and pressure range. Substantial changes in σ and
S are induced by a slight application of pressure. The region where such changes occur is determined can the concentration-temperature plane. It is suggested that the observed semiconductor to metal transition is originated from the structural change.
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Toshinobu Soma, Kinya Kudo
1980 Volume 48 Issue 1 Pages
115-122
Published: January 15, 1980
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Using a phenomenological theory with the experimental pressure dependence of elastic stiffness constants and the linear interpolation formula for mode Grüneisen parameters, the thermal expansion and the pressure effect on the lattice dynamics are investigated for tetrahedrally covalent compounds. The observed data for the temperature-dependence of thermal expansion coefficients are reproduced by introducing only two parameters. One is the parameter for the transverse acoustical mode related to the negative thermal expansion at a low temperature, and the other is that for the optical mode related to the constant thermal expansion at a high temperature. Numerical calculations are performed for GaAs, GaSb, InSb, ZnSe and ZnTe, and the derived mode Grüneisen parameters give useful data on the experimental pressure dependence of phonon frequencies.
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Tamio Oguchi, Katsuaki Sato, Teruo Teranishi
1980 Volume 48 Issue 1 Pages
123-128
Published: January 15, 1980
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Optical reflectivity spectra have been measured at room temperature on a single crystal of CuFeS
2 between 0.025 and 6 eV. The experimental results have been used to calculate the optical constants, the dielectric constant and the absorption coefficient. There have been found an absorption band with peaks at 1.0 and 2.1 eV and an absorption edge at approximately 3.2 eV. The band can be assigned to the charge-transfer transition from the valence band to the empty 3d states of Fe, and the edge can be attributed to the commencement of the band to band transition. A schematical energy level diagram for CuFeS
2 is given from the result.
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Yasukazu Yoshizawa, Kiyoshi Shizuma, Toshiaki Fujita, Masato Nishi
1980 Volume 48 Issue 1 Pages
129-133
Published: January 15, 1980
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Doppler broadening method of positron annihilation radiation has been applied to the study of anisotropies of momentum distributions for KCl and RbBr crystals. Positron annihilation radiations were measured with a Ge(Li) detector. Anisotropies among the [100], [110] and [111] directions were measured in detail for the KCl and RbBr crystals. The result shows that the observed anisotropies are consistent with the theoretical estimates based on the Brillouin zone.
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Toshiro Tani, Shoji Tanaka
1980 Volume 48 Issue 1 Pages
134-142
Published: January 15, 1980
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Under the hydrostatic pressure up to 4.7 kbar, the impurity states in undoped and Sb-doped single crystal tellurium are investigated by measuring the conductivities and Hall coefficients in the temperature region from 77 K to 1.4 K. The pressure dependences of the conductivity and Hall coefficient are different between undoped and Sb-doped crystal at low temperature. This indicates that there are two kinds of impurity states in tellurium, one is the impurity band-like states degenerate in the top of the valence band and the other is the ordinary acceptor states formed by group V impurities. Pressure dependences of these impurity states are discussed and in Sb-doped tellurium the possibility of the pressure-induced metal-insulator transition in impurity conduction is proposed.
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Hiroshi Numata
1980 Volume 48 Issue 1 Pages
143-149
Published: January 15, 1980
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Microwave absorption due to the longitudinal-section electric (LSE) modes is considered for a semiconductor-slab loaded in a wave guide. The absorption gets maximum when the fundamental LSE surface-wave is strongly excited and resonates geometrically inside the slab. The conditions for occurrence of the strong absorption depend remarkably on frequency and the size of the slab, but are adjustable by variation of magnetic field value and carrier densities. These absorptions explain quite well the results observed near cyclotron resonance fields for Ge-slabs by Otsuka
et al.
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Masaaki Takashige, Terutaro Nakamura, Masayuki Udagawa, Seiji Kojima, ...
1980 Volume 48 Issue 1 Pages
150-156
Published: January 15, 1980
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Raman spectra of Rb
2ZnBr
4 were measured in the temperature region including the normal-incommensurate (
Ti=73°C) and incommensurate-commensurate (
Tc=−86°C) phase transition points. At the optical geometries of
c(
aa)
b and
a(
cc)
b, a soft mode has been observed whose frequency shift decreases as
Ti is approached from below. At the geometry of
a(
ca)
b, the change in the Rayleigh wing has been observed on passing. through
Tc. Detailed measurements with an I
2-filter were also made.
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Takashi Matsuda, Ichiro Hatta
1980 Volume 48 Issue 1 Pages
157-159
Published: January 15, 1980
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Ultrasonic velocity and attenuation of Rb
2ZnCl
4 were measured around the normal-incommensurate transition. From the velocity change of the transverse wave the critical exponent 2β was determined to be 2β=0.62±0.05, which is very close to the three-dimensional Ising exponent.
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Ichiro Hatta, Morio Hanami, Katsumi Hamano
1980 Volume 48 Issue 1 Pages
160-167
Published: January 15, 1980
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At various ultrasonic frequencies the attenuation coefficient and the sound velocity together with the dielectric constant were simultaneously measured near the incommensurate-and-antiferroelectric phase transition temperature (
TN). The difference between
TN and the temperature where the maximum attenuation coefficient appeared was obtained as a function of frequency. According to the theories of Landau-Khalatnikov and of Bruce-Cowley, the results could be explained in terms of the critical slowing-down of the amplitude mode below
TN. In the case of the plane wave limit as in NaNO
2 the phase mode is not coupled with the acoustic mode contrary to the amplitude mode and thus no information about the diffusion-type phase mode could be drawn.
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Katsumi Hamano, Shunsuke Hirotsu
1980 Volume 48 Issue 1 Pages
168-176
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Phenomenological equations are derived which interrelate the anomalies in various thermodynamic quantities above the transition point of a cubic-to-tetragonal phase transition caused by an instability of a triply degenerate soft mode. The anomalous part of the Gibbs free energy is assumed to be a simple sum of the three parts which represent the contributions from the three fluctuation components. A cylindrical approximation is adopted to each of the three contributions by taking into account the symmetry of the fluctuations. The theory predicts that the adiabatic elastic compliances,
s11s,
s12s, and also
s11s−
s12s should exhibit anomalies proportional to the anomaly in the specific heat at constant pressure. This is in marked contrast with the result of the generalized Pippard equations derived by Garland, and by Janovec. The new equations are successfully tested for KMnF
3, CsPbCl
3, and CsPbBr
3. The β-γ transition of NH
4Br is also discussed.
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Hikaru Terauchi, Tooru Sakai, Yasusada Yamada
1980 Volume 48 Issue 1 Pages
177-184
Published: January 15, 1980
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The orthorhombic to monoclinic phase transition of aniline-HBr crystal has been investigated with X-ray scattering technique to clarify the mechanism of the phase transition. The temperature dependence of monoclinic angle below the transition indicates the occurrence of ferroelasticity in this substance. The temperature dependence and the
q-dependence of the X-ray critical scattering show that a transverse optical mode as well as the uniform transverse acoustic mode becomes unstable at the transition. The phase transition is discussed in terms of the coupling of the three systems: NH
3+ ion having an order-disorder freedom of motion, shear strain, and internal displacement of ion described by the TO-mode.
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Naoki Yamamoto, Katsumichi Yagi, Goro Honjo, Masakazu Kimura, Tsutomu ...
1980 Volume 48 Issue 1 Pages
185-191
Published: January 15, 1980
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New low temperature phases of Sr
2Ta
2O
7 and Sr
2Nb
2O
7 were found by electron microscopy. Sr
2Ta
2O
7 undergoes a structural phase transition at about 170°C to a superlattice structure belonging to the monoclinic system with space group P2
1⁄
m, accompanying the appearance of characteristic twin and antiphase domains. Sr
2Nb
2O
7 has an incommensurate phase below about 220°C with an irrational lattice modulation in the [100] direction and an intricate fine domain-like texture.
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Susumu Katano, Nobuo Môri, Kazuo Nakayama
1980 Volume 48 Issue 1 Pages
192-199
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The electrical resistivity of
Cr–Co alloys containing up to 8 at.% Co is measured in detail over the temperature range 1.8 K–340 K. The resistivity minimum is observed in the alloys containing more than 2 at.% Co. The temperature of the minimum and the depth of the minimum increase rapidly with the concentration of Co, depending on
c and
c3, respectively (
c is the concentration of Co). The measured resistivity of the alloy containing 4 at.% Co shows a constant value below about 4 K, decreases with increasing temperature in proportion to
T2 up to about 14 K and exhibits a minimum. These results suggest that the resistivity minimum in
Cr–Co alloys is due to the Kondo effect by pairs of Co atoms, not by isolated Co atoms. The Kondo temperature
TK of
Cr-4 at.% Co alloy is estimated to be about 280 K and is considerably high.
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Masaru Tsukada, Chikatoshi Satoko, Hirohiko Adachi
1980 Volume 48 Issue 1 Pages
200-210
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The electronic structure of SrTiO
3 (100) surface is investigated by the DV-Xα cluster method. It is demonstrated by the first principle, calculations that the intrinsic deep surface states do not exist on this surface. On the other hand the possibility of the three types of shallow surface states is suggested; A) those derived from
xz,
yz like
d orbitals of surface Ti, B) those coming from 3
z2−
r2 like
d orbital admixed with 4
pz, 4
s orbitals of surface Ti, and C) those associated with the surface O 2
p orbitals. The energy and properties of the localized electronic states induced by surface and bulk oxygen vacancies are calculated and compared with recent UPS and ELS experiments.
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Hiroyuki Shiba
1980 Volume 48 Issue 1 Pages
211-218
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As a continuation of the previous paper with the same title [J. Phys. Soc. Jpn.
46 (1979) 1852], a study is made again on the structure of rare gas monolayers physisorbed on graphite on the basis of a more realistic substrate potential. The two-dimensional sine-Gordon equation, which determines the equilibrium position of monolayer atoms with hexagonal modulation, is solved by a numerical variational method. The resulting free energy is compared to the monolayer with uniaxial mudulation. The present theory is shown to be equivalent to Novaco and McTague’s theory in the limit of weak substrate potentials. Finally, a comparison is made also with the LEED and X-ray experiments on Kr and Ar monolayers, showing the present theory is in better agreement with the experiments than the previous paper.
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Akio Kotani, Michitaka Suzuki
1980 Volume 48 Issue 1 Pages
219-227
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By extending a previous paper such that the condition of the weak coupling limit is relaxed, the relationship between resonant light scattering and luminescence is studied in a localized electron-phonon system with quadratic interaction. The total light scattering spectrum is decomposed into successive terms of
Sn representing the effect of the
n-th order multiple phonon scattering in the intermediate state. It is shown that the line shape of
Sn changes gradually with
n and approaches, for sufficiently large
n, the luminescence spectrum. Effects of changes in the electron-phonon interaction strength, sharpness of the phonon density of states and radiative damping on the approach of
Sn to the luminescence limit are studied. The validity of the approximate calculation employed here is discussed in connection with a sum rule and a comparison of absorption spectra calculated with some different approximation methods.
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Takao Nanba, Minoru Sagara, Mikihiko Ikezawa
1980 Volume 48 Issue 1 Pages
228-234
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The far-infrared optical absorption spectra of CH
4 and CD
4 molecules diluted in condensed Xe, Kr and Ar have been obtained at 6 K. The isotope shifts of the peak energy showed that observed absorption bands are due to rotational transitions and vibrational ones of the substituted molecules. In the Xe matrix the vibrational absorption band has not been found. The observed peak positions of the rotational transitions are compared with a theoretical calculation by Nishiyama and Yamamoto. The agreement between the experiment and the theory is good in the case of the Xe matrix but poor in the Kr and Ar matrices. The discrepancy is discussed in relation to the intensity of the vibrational band.
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Hirohisa Endo, Makoto Yao, Katsuhiko Ishida
1980 Volume 48 Issue 1 Pages
235-237
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Ionic and electronic conductivities and thermoelectric power have been measured for liquid Ag chalcogenides up to 1500°C. High ionic conductivity has been observed near the melting points for liquid Ag
2S, Ag
2Se and Ag
2Te. The ionic conductivity for liquid Ag
2S and Ag
2Se change little with temperature, while that for liquid Ag
2Te rapidly decreases with increasing temperature.
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Jan Weiland
1980 Volume 48 Issue 1 Pages
238-246
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Excitation of dissipative drift wave turbulence with waves propagating perpendicular to the density gradient is studied numerically, taking an average over the gradient coordinate. Both situations where the plasma current is the main source of instability and situations more close to an ordinary dissipative drift wave, excitation have been investigated in the presence of finite β effects and ion viscosity. The main saturation mechanism has been quasilinear modification of the background density. In addition to the usual current induced growth, the current is also found to decrease the finite β stabilization.
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Takashi Maekawa, Shigetoshi Tanaka, Yasushi Terumichi, Yasuji Hamada
1980 Volume 48 Issue 1 Pages
247-257
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Wave trajectories and cyclotron damping of the electromagnetic waves (O- and X-modes) and the electron Bernstein wave (B-mode) propagating in three dimensional toroidal plasmas are investigated, assuming the geometrical optics. Electron cyclotron heating (ECH) by injection of O- and X-mode is effective in low density (ω
pe<
Ωe≈ω), high electron temperature
Te plasmas in large tori. Here, ω
pe,
Ωe, and ω are the electron Langmuir, cyclotron and the applied frequencies, respectively. On the other hand, B-mode is effective for ECH on high density plasmas (ω
pe>
Ωe≈ω), where B-mode is linearly converted from X-mode or O-mode (the latter being converted to X- and then to B-mode). Because of strong damping, B-mode is also useful for low
Te plasmas. Propagation characteristics and mode-conversion in these high density plasmas are studied in detail.
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Kimitaka Itoh, Takashi Tuda, Sanae Inoue
1980 Volume 48 Issue 1 Pages
258-263
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Toroidal curvature effects on the electrostatic collisionless drift instability in a sheared magnetic field is investigated. The magnetic curvature drift of ions reduces or even annihilates the shear convective damping and causes the mode ballooning. It is found that the universal mode is stable (or marginally stable at most) so long as the convective damping remains finite, and the critical current density for the current-driven drift instability becomes lower.
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Sanae Inoue, Kimitaka Itoh, Yoshinosuke Terashima
1980 Volume 48 Issue 1 Pages
264-272
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A scaling law for high density and high current tokamaks is presented on the basis of the nonlocal theory of electrostatic current-driven drift instability in both collisionless and collisional regimes with the assumption of quasilinear saturation level. It is shown that the energy confinement time scales as τ
E∝
nq(
a)⁄\sqrt
Te (
n,
Te and
q(
a) are the averaged density, electron temperature and the safety factor at the plasma edge.) in relatively lower density region and τ
E∝
B⁄\sqrt
n (
B is the toroidal magnetic field) in higher density region where a combined effect of the electron collisions and of a plasma current works. Trapped particle effects are assumed to be negligible and no magnetic fluctuation is considered. A test experiment of the scaling law on the J.I.I.P.T–II device where both tokamak operation and the operation with superposition of helical fields are possible is proposed.
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Masaki Maeno, Norio Suzuki, Shigeru Konoshima, Takumi Yamamoto, Michiy ...
1980 Volume 48 Issue 1 Pages
273-278
Published: January 15, 1980
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In medium
qa(
qa\simeq3) discharges, enhanced radiation loss power due to increased plasma-wall interaction plays an important role in the growth of low frequency oscillations. The
m=2 tearing mode seems to be the most plausible cause of the disruption. The reduction of the impurity is essential in realizing the stable discharges of medium
qa. Attainable
qa is reduced with decreasing radiation loss power. In low
qa(
qa<2) discharges, no enhancement of the radiation loss power was observed until the disruption. The plasma disrupts at
qa\lesssim2. The
m=2 kink mode is the probable cause of the disruption. Attainable
qa is reduced with decreasing the ratio of shell radius to plasma radius. The possibility of the shell stabilization against the
m=2 kink mode is proposed,
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Yoshi H. Ichikawa, Kimiaki Konno, Miki Wadati, Heiji Sanuki
1980 Volume 48 Issue 1 Pages
279-286
Published: January 15, 1980
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A new type of nonlinear evolution equation for the Alfvén waves, propagating parallel to the magnetic field, is now registered to the completely integrable family of nonlinear evolution equations. In spite of the extensive studies of Kaup and Newell, and of Kawata and Inoue, these analysis have been dealing with solutions for restricted boundary conditions. The present paper presents full account of stationary solitary wave solutions for the plane wave boundary condition. The obtained results exhibit peculiar structure of spiky modulation of amplitude and phase, which arises from the derivative nonlinear coupling term. A nonlinear equation for complex amplitude associated with the carrier wave is shown to be a mixed type of nonlinear Schrödinger equation, having an ordinary cubic nonlinear Schrödinger equation, having an ordinary cubic nonlinear term and the derivative of cubic nonlinear term.
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Masao Sugawa
1980 Volume 48 Issue 1 Pages
287-294
Published: January 15, 1980
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We have observed experimentally the parametric excitation of ion acoustic waves and electrostatic ton cyclotron waves by
hf electric fields with frequencies of unstable electrostatic ion cyclotron waves. The resonant condition is satisfied, and the decay waves are amplified exponentially by increasing the amplitude of the pump wave. The growth rate of the decay waves and the threshold of pump
hf electric fields measured experimentally is compared with the theory.
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Kazuo Imasaki, Shuji Miyamoto, Sadao Nakai, Chiyoe Yamanaka
1980 Volume 48 Issue 1 Pages
295-300
Published: January 15, 1980
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The energy and yield of neutrons and protons from REB irradiated D–D targets were measured, which implied thermonuclear D–D reactions in corona plasma. The energy deposition range of the beam electrons was found to be so short that two stream instability should be introduced for beam-target interaction.
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Akira Yoshizawa, Masayuki Sakiyama
1980 Volume 48 Issue 1 Pages
301-305
Published: January 15, 1980
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Fluctuation of a passive scalar in homogeneous turbulence with known statistics is analysed by means of a statistical method (A. Yoshizawa: J. Phys. Soc. Jpn.
45 (1978) 1734) developed in the study of the small-scale structure of the velocity field. A Galilean transformation based on the velocity of big eddies is applied to the diffusion equation for a passive scalar in order to remove their convection effect. The equation thus found is combined with the direct-interaction formalism, and the −5⁄3 power law for the spectrum of the mean-squared scalar fluctuation is derived in good agreement with experimental measurements.
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Nobumasa Takemitsu
1980 Volume 48 Issue 1 Pages
306-311
Published: January 15, 1980
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The steady flow around a circular cylinder is numerically investigated. The solutions are obtained at Reynolds numbers of 40, 100, 200, 400, 500, 700 and 1000 by an implicit finite-difference approximation. The similarity of the shape of standing vortices is confirmed at Reynolds numbers from 20 to 100, and the similarity of the velocity distribution along the flow axis in the standing vortices is confirmed at Reynolds numbers from 15 to 100.
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Miki Wadati, Katuro Sawada
1980 Volume 48 Issue 1 Pages
312-318
Published: January 15, 1980
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A method of solution for the Korteweg-de Vries equation is presented. It is shown that the
N-soliton solution is expressed in a compact form using a trace of matrix. It is also shown that a field theoretical representation is possible for the
N-soliton solution. The representation yields a novel derivation of the Gelfand-Levitan equation.
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Miki Wadati, Katuro Sawada
1980 Volume 48 Issue 1 Pages
319-325
Published: January 15, 1980
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The trace method which has been proposed in a recent paper by the authors is applied to the modified Korteweg-de Vries equation. It is shown that the
N-soliton solution is put into a compact form using a trace of matrix. It is also shown that a field theoretical representation for the
N-soliton solution yields a simple derivation of the Gelfand-Levitan equation.
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Syoji Shiokawa, Hirohiko Adachi, Shosuke Imoto
1980 Volume 48 Issue 1 Pages
327-328
Published: January 15, 1980
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The energy levels for (UO
8)
12− and (UX
6)
n− (X=N, O and S) clusters have been investigated using the self-consistent discrete variational (DV)-Xα method. The level structure, especially in valence band of anion p is greatly modified by taking account of potentials from surrounding ions, and agrees well with the experimental XPS spectra. The effects of self-consistency are small in the level structures of (UO
8)
12−, but are very important in those of (UX
6)
n− clusters.
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Yoshihito Miyako, Susumu Chikazawa, Toshiaki Saito, Y. G. Yuochunas
1980 Volume 48 Issue 1 Pages
329-330
Published: January 15, 1980
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The imaginary part of the susceptibility of (Ti
0.9V
0.1)
2O
3 was measured and the temperature dependence of the characteristic relaxation time, which showed a sharp peak at a spin freezing temperature
Tg, was obtained using a modified Debye formula proposed by Matsubara and Yoshimitsu.
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Kunio Nishida, Takashi Sambongi, Masayuki Ido
1980 Volume 48 Issue 1 Pages
331-332
Published: January 15, 1980
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The electrical resistivity of NbSe
3 doped with Zr was measured. While pure NbSe
3 remained normal above 1.2 K, a two-stage decrease of the resistivity was observed in doped crystals below 3 K attributable to the onset of superconductivity. We conclude that CDW suppresses superconductivity in the pure limit by some unknown mechanism.
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Jun-ichi Wakabayashi, Shinji Kawaji
1980 Volume 48 Issue 1 Pages
333-334
Published: January 15, 1980
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Quantitative results of Hall conductivity σ
xy in
n-type silicon inversion layers have been obtained successfully by the use of the Hall current method. Results in the electron mobility dependence of the Landau level width are in good agreement with the theoretical prediction.
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Takao Nanba, Ikue Kawashima
1980 Volume 48 Issue 1 Pages
335-336
Published: January 15, 1980
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Second-order Raman scattering spectra have been measured in TlBr and TlCl single crystals at 77 K. In both crystals, the resonant behavior of the overtone band of LO phonon with
q∼0 (the 2LO(
Γ) band) is explained by the theory of Ganguly and Birman. Combination bands of two phonons with large wave vector have been observed in the spectra. The dependence of their intensities on the incident photon energy has been found to be different from that of the 2LO(
Γ) band, which shows that the scattering processes are different.
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