-
Kimiaki Konno, Alan Jeffrey
1983 Volume 52 Issue 1 Pages
1-3
Published: January 15, 1983
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It is shown that, depending on the ratio of the two eigenvalues in the inverse scattering method, the two loop soliton solution has some remarkable properties in collision processes.
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Tetsuo Nagata
1983 Volume 52 Issue 1 Pages
4-5
Published: January 15, 1983
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Cross section for Lyman-alpha emission in H
+–Cs charge transfer excitation has been measured in the H
+ energy range from 0.18 keV to 5.0 keV. The result shows noticeable oscillation-structure. This is a further evidence for the existence of secondary long-range interaction between charge-exchange channels which was firstly proposed by Pradel
et al. and later discussed in detail by Sidis and Kubach.
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A. Bharali, A. K. Borkakati
1983 Volume 52 Issue 1 Pages
6-7
Published: January 15, 1983
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The response of flow and heat transfer to change of direction of the imposed magnetic field in steady Magnetohydrodynamic laminar free convection flow past an infinite vertical porous plate is studied taking Hall effects into account.
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Sadatoshi Taneda
1983 Volume 52 Issue 1 Pages
8-9
Published: January 15, 1983
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The flow past a corner where two plane walls meet at an angle less than 180° is examined by means of flow visualization methods. It is found that the boundary layer forms streamwise vortices at the corner, whether the boundary layer is laminar or turbulent.
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Kin-ichi Masuda, Kenichi Kojima
1983 Volume 52 Issue 1 Pages
10-13
Published: January 15, 1983
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The atomic configurations and excess energies of the {113} stacking faults in covalent semiconductors have been calculated for the first time using the tight-binding type electronic theory (bond orbital model) and the Born-Mayer repulsive potential. The stability of dislocation loops produced by electron irradiation is also discussed.
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Hideaki Kasai, Yoshinori Okumura, Ayao Okiji
1983 Volume 52 Issue 1 Pages
14-15
Published: January 15, 1983
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The angular dependence of the intensity for the angle-resolved X-ray photoemission of deep core levels in adsorbates is calculated numerically in order to investigate the results obtained by Kono
et al.
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Hidetoshi Fukuyama, Yoshimasa Isawa, Hiroshi Yasuhara
1983 Volume 52 Issue 1 Pages
16-17
Published: January 15, 1983
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Higher order effects of interactions are investigated in the two-dimensional weakly localized regime. Depending on the sign of interactions, the four coupling constants
gi, (
i=1∼4), are seen to have characteristic renormalization, and the quantum correction to the conductivity is examined in the same context.
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Hidetoshi Fukuyama
1983 Volume 52 Issue 1 Pages
18-19
Published: January 15, 1983
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The quantum corrections to the Hall conductivity, σ
xy, are evaluated in the presence of strong spin-orbit scattering and the result indicates that the mobility, not the effective carrier number, contains the logarithmic correction as in the case without spin-orbit scattering.
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Shun-ichi Kobayashi, Satoshi Okuma, Fumio Komori, Wataru Sasaki
1983 Volume 52 Issue 1 Pages
20-22
Published: January 15, 1983
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Temperature and magnetic field dependence of conductivity in resistive thin films of Zn was measured. In zero field, conductivity decreased as ln
T as temperature was lowered and showed an enhanced paraconductivity which diverged at
Tc. When field was applied,
Tc decreased, ln
T dependence extended to lower temperature and the coefficent of ln
T increased. The origin of these results was discussed from the view point of electron localization and interaction effects in two dimensional disordered metal.
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Yoshiyuku Morioka, Ichiro Nakagawa
1983 Volume 52 Issue 1 Pages
23-24
Published: January 15, 1983
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Raman spectra of K
3Co
1−xFe
x(CN)
6 (
x≈0.03) were measured in the temperature range from room temperature to 22 K. The room temperature phase was the orthorhombic polytype of K
3Co(CN)
6. It was found that this crystal undergoes a structural phase transition at 81 K from the observation of a soft mode which decreases its frequency as the transition temperature is approached from both sides. On the basis of the polarized Raman measurements of the soft mode and symmetry consideration, the structure below 81 K was found to be monoclinic.
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Sadao Takaoka, Kazuo Murase
1983 Volume 52 Issue 1 Pages
25-27
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Pb
1−xSn
xTe crystals doped with group III elements (In and Ga) exhibit absorption bands at 160 cm
−1 and 187 cm
−1 in the far-infrared region with In-doped and Ga-doped samples, respectively, which are almost independent of temperatures and tin compositions. These bands are ascribed to the local vibrational modes of In and Ga tons and the ratio of the frequencies could be explained by a simple XY
6 molecular model.
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Yoichi Serizawa, Tsuguhiro Watanabe, M. Bashir Chaudhry, Kyoji Nishika ...
1983 Volume 52 Issue 1 Pages
28-35
Published: January 15, 1983
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A new numerical method for solving an integral equation
F(
k)
Ψ(
k)=∫
−∞∞d
k′
K(
k,
k′; ω)
Ψ(
k′)
to obtain eigenvalues ω and the corresponding eigenfunctions
Ψ(
k) is proposed. The kernel of the integrand
K(
k,
k′; ω) is a complex function with respect to
k,
k′ and has no particular symmetries. The method is based upon Newton’s iterative method and gives high efficiency in numerical analyses. As an example the problem of the drift wave in a sheared magnetic field is presented.
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Toru Shimizu, Katsuro Sawada, Miki Wadati
1983 Volume 52 Issue 1 Pages
36-43
Published: January 15, 1983
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The equation which describes the bending of an elastic wire is found to be closely related to a new integrable nonlinear evolution equation. From this fact, it is shown that the one-kink curve of an elastic wire (the Elastica) is obtained from a one-soliton solution through the inverse scattering method.
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Tatsuzo Nagai, Hidetoshi Fukuyama
1983 Volume 52 Issue 1 Pages
44-53
Published: January 15, 1983
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The energy of Wigner crystal of the hcp structure is calculated in magnetic fields. It is obtained as a sum of the static energy and the zero-point vibrational energy in the harmonic approximation. The zero-point energy of the hcp becomes lower than those of the bcc and fcc structures, which were previously obtained, above a critical strength of magnetic field. This leads to a structural phase transition from the bcc to the hcp as the magnetic field is increased. The crystal structure with the lowest energy is determined in the plane of density and field.
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Akitoshi Nishimura, Kasuke Takahashi
1983 Volume 52 Issue 1 Pages
54-60
Published: January 15, 1983
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Various nuclear effects upon nucleon decays, which occur in a nucleus, are extensively studied with an emphasis on a huge water Cerenkov detector. The Monte Carlo calculation is carried out for the typical decay process nucleon— positron+pion. The virtual meson exchange process is also taken into consideration. Results show that apart from the Fermi motion effect about 50% of nucleon decay signals are completely free from nuclear effects in the case of
13O nucleus. The advantage of using material made from light nuclei is discussed.
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S. S. Sooch, Ravinder Kaur, Nirmal Singh, P. N. Trehan
1983 Volume 52 Issue 1 Pages
61-68
Published: January 15, 1983
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The gamma-gamma angular correlations on 17 cascades in
132Xe from the decay of
132I have been measured using a Ge(Li)–NaI(Tl) coincidence set-up. Out of these, the correlation coefficients of the 363–772, 650–(523)–772, 877–(523)–772, 910–772 and 910–(772)–668 keV cascades have been measured for the first time. These measurements have been used to deduce the multipole mixing ratios of 11 transitions in
132Xe. The results are: δ(363)=−0.023±0.023, δ(523)=−0.23±0.16, δ(630)=6.1
−2.5+6.5, δ(650)=−0.16±0.11, δ(877)=−1.2±0.5, δ(955)=−0.033±0.033, δ(1136)=0.45±0.05, δ(1173)=−0.6±0.4 or −2.0
−6.0+0.9, δ(1372)=0.02±0.07, δ(1399)=0.04±0.02 and δ(1442)=−0.02±0.03. The directional correlation results have also been used to deduce the spin value of 4
+ to each of the 1962.9, 2394.9 and 2840.5 keV levels and those of 3
+ and 3
+ or 5
+ to the 2669.9 and 2350.7 keV levels respectively.
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Kiyoji Fukunaga, Shigeru Kakigi, Takao Ohsawa, Akira Okihana
1983 Volume 52 Issue 1 Pages
69-73
Published: January 15, 1983
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A rescattering effect in the multiple scattering is calculated for the transition amplitude of quasi-free scattering in the reaction
p+
d→
p+
p+
n. The calculated results reproduce, except for a limited region, the ratio of the experimental cross section to the calculation on a spectator model in an impulse approximation. We find that the effect of the second scattering term and the spin factor are important in the difference between the
p-
p and
p-
n quasi-free scatterings.
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Seiji Mizuhashi
1983 Volume 52 Issue 1 Pages
74-80
Published: January 15, 1983
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The triggering mechanism at the transition from the
T-conformation to
R-conformation in the Hemoglobin is attributed to the pseudo-Jahn-Teller effect resulting from the intra-atomic (3d)
6–(3d)
5(4p) interaction by an
A2u vibrational mode. The general formula for this effect in ion-porphyrins as well as metalloporphyrins is given by the closure approximation. The explicit adiabatic potentials of the iron for the tertiary two conformations (
t- and
r-conformation) are given.
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Asharfi Lal Sharma, K. Rama Reddy, Arvind , Nasser Ahmad
1983 Volume 52 Issue 1 Pages
81-83
Published: January 15, 1983
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Several Schiff base complexes containing
151Eu metal ion have been synthesized and their Mössbauer spectra are studied. From systematic analysis of the quadrupole coupling constants and isomer shifts the coordination number of the metal ion, in each complex, has been assigned. The observed recoilless factors are fairly high.
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Hiroshi Daimon, Tamotsu Kondow, Kozo Kuchitsu
1983 Volume 52 Issue 1 Pages
84-89
Published: January 15, 1983
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The relative differential cross sections of electrons scattered by CCl
4 were measured by a cross-beam method at the incident energies of 70, 200 and 400 eV and at scattering angles between 4 and 135°. Calculations based on the independent-atom model including intramolecular double scattering and polarization accounted for the measured cross sections; they were used for normalization of the measured relative cross sections.
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Hiromitsu Hamabata, Tomikazu Namikawa
1983 Volume 52 Issue 1 Pages
90-93
Published: January 15, 1983
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The propagation of thermoconvective waves in a horizontal layer of viscoelastic liquid (Oldroyd’s liquid B) heated from below is investigated. It is shown that the wave propagates without damping at the critical condition for the onset of overstability and that as the elastic parameter increases the damping length (the logarithmic decrement) becomes large (small) near the critical Rayleigh number for the onset of stationary instability. When the ratio of retardation time to relaxation time is very small, the weakly damped wave can exist for high frequencies even if the liquid layer is isothermal.
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Shunjiro Shinohara, Kaichiro Sakuma, Yoshio Nagayama, Hiroshi Toyama
1983 Volume 52 Issue 1 Pages
94-99
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In a non-circular tokamak (TNT-A), the relation between elongation ratio
k and decay index
n(=−(
r⁄
Bz)·(∂
Bz⁄∂
r)) is investigated, varying the curvature of the shaping field. Both active and passive control have been done in the region of −0.9<
n<−0.2. By Thomson scattering, magnetic probes and flux loops measurements, a D-shaped, stable plasma of
Te0∼180 eV,
ne0∼10
13 cm
−3,
qa>2 (the MHD oscillation of
m=2 mode appears) with elongation ratio of up to 1.5 is obtained. The numerical curve of plasma equilibrium in (
k,
n) space fits well with the measurements. The effects of the iron core and shell on the decay index are important in a non-circular tokamak. The iron core makes the decay index lower, and the shell makes the field curvature smaller. The calculation and measurements show that the decay index is mainly affected by the iron core.
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Akihiko Murakami, Yukio Midzuno
1983 Volume 52 Issue 1 Pages
100-107
Published: January 15, 1983
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The mechanism of the current generation in a collisionless plasma by a train of travelling mirrors with modulated phase velocity is studied based on the theory of intrinsic stochasticity.
It is shown that, if the phase modulation is small, the main contribution to the current generation comes from the phase mixing of the trajectories of trapped electrons in each Fourier component of a driving wave. For the case of a moderate phase modulation, however, formation of a large stochastic region due to the overlapping of primary resonances is very effective for increasing the generated current. Large phase modulation has little advantage in the current generation because the stochastic regions are formed, so to speak, at random in the phase plane.
The results of analytical evaluation based on the above theory agree quite well with results of numerical experiments.
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Sho-Ji Tanaka, Shuichi Takamura, Takayoshi Okuda
1983 Volume 52 Issue 1 Pages
108-115
Published: January 15, 1983
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Behavior of fast ions coupled with lower hybrid waves is investigated numerically in a tokamak geometry. Applying the stochastic ion heating theory proposed by Karney to a real geometry, it is confirmed that the ions are accelerated stochastically and form the high energy tail in 0.1–0.2 ms. As regards the particle confinement, it is clarified that the lower hybrid heating results in an enhancement of the ion orbit loss. The RF power and the plasma current dependence of the loss fraction is obtained.
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Mitsuhiro Shigeta, Toshio Tange, Kyoji Nishikawa
1983 Volume 52 Issue 1 Pages
116-123
Published: January 15, 1983
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A nonlinear eigenvalue equation for drift wave in a sheared magnetic field is derived by summing the most secular terms of nonlinear electron response. Restricting ourselves to the case where the wave is monochromatic and its amplitude is small, we numerically investigated amplitude dependence of the eigen-frequency. The drift wave is found to be destabilized as the fluctuation amplitude increases.
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Kiyotaka Hamamatsu, Tsuguhiro Watanabe, James W. Van Dam, Kyoji Nishik ...
1983 Volume 52 Issue 1 Pages
124-131
Published: January 15, 1983
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A computational method for analyzing axially symmetric Vlasov equilibrium as nonlinear boundary value problem is presented. The method consists of combined use of shooting method and Newton’s method. Equilibrium distribution function is expressed in terms of constants (or quasi-constants) of motion and parameters representing temperature anisotropy and magnetic trapping. Charge and current density calculated are substituted into Maxwell equations which reduce to coupled equations for magnetic flux function and electrostatic potential. These equations are solved by shooting method from two opposite boundaries on which the values are determined by Newton’s iteration scheme such that solution are smoothly connected inside plasma. Some techniques are introduced to remove singularities on symmetry axis and to determine boundary values on vacuum surface. The method is applied to bumpy cylinder with hot electrons and surface plasma and to thermal barrier with sloshing ions, energetic and warm electrons and surface plasma, assuming periodicity along symmetry axis.
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Motokazu Kogiso
1983 Volume 52 Issue 1 Pages
132-140
Published: January 15, 1983
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A new approach which clarifies the structure of many-beam dynamical interactions of diffracted waves is developed on the basis of an analytical formula for the diffracted intensity averaged over crystal thickness. In the systematic
n-beam case the orientation dependence of the averaged intensity is proved to be expressed as a linear combination of terms of resonance type (
q−
ak)⁄[(
q−
ak)
2+
bk2] and
bk⁄[(
q−
ak)
2+
bk2] for
k=1, …,
n(
n−1)⁄2, where −
q is the tangential component of the incident wave vector to the row of reciprocal lattice points. Each term can be associated with Bragg reflections between pairs of plane wave components of Bloch waves. The parameters
ak and
bk indicate Bragg positions and reflection widths. Modifications of the result are briefly discussed about the critical voltage effect and the non-systematic case.
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Ken-ichir\={o} Ishii
1983 Volume 52 Issue 1 Pages
141-148
Published: January 15, 1983
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The ratio of amplitude-dependent internal friction to the associated modulus change is discussed for the case where the both quantities are due to dislocations oscillating in the lattice. It is shown that the ratio lies between π and 4, when the motion of dislocation is limited by frictional forces. The ratio has a smaller value, when the motion is prevented by the obstacles such as subboundaries, or when it is limited by tension forces.
Comparison of the above results with available data on copper, copper alloys and lead shows that the experimental values of the ratio can be explained by assuming that the internal friction is due to dislocations oscillating in the lattice, where impurities are randomly distributed.
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Ken-ichir\={o} Ishii
1983 Volume 52 Issue 1 Pages
149-156
Published: January 15, 1983
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The amplitude-dependent internal friction which is due to dislocations oscillating in the lattice is described in terms of dislocation mobility, under the condition that the motion of dislocation is limited by tension forces, as will be the case at low frequencies. It is shown that the friction increases as the frequency increases and that it decreases as the amplitude increases. These results are in contrast to those obtained before for the internal friction at high frequencies, where the internal friction increases with the amplitude and has an inverse frequency dependence.
Comparison with available data of low frequency internal friction on copper and α-brass shows that the line-tension limited motion accounts for the observed results.
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Hiroshi Fujita, Shir\={o} Kimura
1983 Volume 52 Issue 1 Pages
157-167
Published: January 15, 1983
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The specimens were deformed up to fracture and the dislocation structures at each stage of deformation have been observed in wide regions with a 3MV electron microscope. Results show that the conjugate slip is closely related to each stage of deformation as follows: 1) The dislocations of conjugate system are widely dispersed on the primary slip bands by the primary slip and interact with the dislocations of primary system to form the hexagonal networks. 2) The primary slip bands are successively work-hardened by the process, and then the dislocations of conjugate system gradually pile up against them. 3) The pile-up dislocations of conjugate system can move through most of the primary slip bands so that the deformation proceeds mainly by the conjugate slip at the beginning of stage
III deformation. 4) The conjugate slip also causes the reactivation of sterile primary slip bands in local regions.
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Tadao Ishii
1983 Volume 52 Issue 1 Pages
168-178
Published: January 15, 1983
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A self-consistent model of two interpenetrating deformable chains is proposed to exactly calculate the ground state and the excitation spectrum in the continuum limit. Transformation from incommensurate state to commensurate state continuously occurs for the out-of-phase coordinate (
W), implying that the transformation simultaneously occurs on both chains, where deformability makes the transformation easier. The in-phase coordinate (
Q), however, is rigid. The excitation spectrum consists of two independent modes, obtained as the interacting modes between
W and
Q through the kinetic coupling. These modes have their own gaps at the inverse kink length. For no kinetic coupling,
Q possesses no gap, though
W still maintains the gap.
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Masatoshi Imada
1983 Volume 52 Issue 1 Pages
179-183
Published: January 15, 1983
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Some results of the molecular dynamics simulation works are presented for the φ
4 chain. The Langevin equation was solved for various strengths of coupling to the heat bath. The central peak in the dynamic structure factor agrees rather well with the theoretical estimation. The importance of the nonlinear excitation is confirmed even in the presence of the random force and damping.
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Kiyosi Motida
1983 Volume 52 Issue 1 Pages
184-186
Published: January 15, 1983
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The ratio of
c⁄
a of five wurtzite type crystals are compared with the theory of Keffer and Portis under the hypothesis that the effective ionic charge equals the Szigeti effective charge. It is shown that the theory can explain reasonably the observation.
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Ikuo Suzuki, Yoshihiro Ishibashi
1983 Volume 52 Issue 1 Pages
187-192
Published: January 15, 1983
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The tricritical point in temperature-electric field phase diagrams was derived for the Landau-type free energy applicable to the antiferroelectric phase transitions. The adopted free energy written in terms of two sublattice polarizations and the applied external field of the symmetry breaking nature contains three possible fourth-order terms and a sixth-order term, thus being capable of producing various types of phase diagrams. Examples of the tricritical points in the phase diagrams are presented for several parameter values.
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Mitsuo Wada, Yoshihiro Ishibashi
1983 Volume 52 Issue 1 Pages
193-199
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The dielectric, ferroelectric, DTA, thermal expansion, Raman scattering and ultrasonic measurements of Li
2Ge
7O
15 single crystal have been performed in a wide temperature range including the phase transition point at
Tc=283.5 K. It has turned out that Li
2Ge
7O
15 undergoes a ferroelectric phase transition of displacive-type and the transition is quite or almost continuous. The Raman spectra obtained support the idea that the phase transition is associated with a soft optic phonon at the Brillouin zone center of the space group
Pbcn in the paraelectric phase.
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Yoshihiro Ishibashi
1983 Volume 52 Issue 1 Pages
200-206
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An order-disorder theory of the tetragonal-monoclinic phase transition of squaric acid (H
2C
4O
4) crystal is developed where the ice rule of proton configurations on hydrogen-bonds is respected. It is shown that the model adopted previously for the antiferroelectric transition of NH
4H
2PO
4 can be applied, only with a slight modification, and it gives rise to a first order transition. The coupling between the transition parameters and the strain component affects the order of the transition.
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W. N. Lawless, Terutaro Nakamura, Masaaki Takashige, S. L. Swartz
1983 Volume 52 Issue 1 Pages
207-214
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Specific heat data are reported, 1.7–30 K, on four samples of PbTiO
3: amorphous ribbon (∼20 vm thick); crystallized ribbon (∼1 μm grain size); crystalline powder (∼1 μm grain size); and ceramic pellet (∼2 μm grain size). Both the amorphous and crystallized ribbon samples display strong Schottky behavior below 4 K with nearly identical (two level) energy separations ≅78 mK. PbO loss from the thin ribbons is postulated to explain these effects. Below 3 K, the powder and pellet samples display a glasslike linear term in the specific heat, and the coefficients of these terms (1.4×10
−5 J cm
−3K
−2) are the same magnitude as those found in glasses. All crystalline forms of PbTiO
3 display maxima in
C⁄
T3 at 15 K, and these maxima are accurately represented by single Einstein terms with frequencies 47–52 cm
−1. Amorphous PbTiO
3 displays a
C⁄
T3 maximum at 10 K, as does vitreous SiO
2. A Debye temperature for crystalline PbTiO
3 of 337 K is reported; the effective Debye temperature for amorphous PbTiO
3 is found to be 256 K.
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Ken’ichi Takano
1983 Volume 52 Issue 1 Pages
215-222
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Solitons (localized objects) in cis-polyacetylene are examined by bosonization of electron operators and semiclassical treatment of the bosonized operators, where some parts of Coulomb interactions are taken into account. There are three types of soliton solutions; a polaron, a charge bisoliton and a spin bisoliton. Among them an isolated polaron seems to be stable in a doped substance. Cis-trans isomerization by doping is described in terms of such solitons. The region between dopants sufficiently close isomerizes; the largest dopant distance to isomerize is about 21 lattice spacings.
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Takahisa Ohno, Hiroshi Kamimura
1983 Volume 52 Issue 1 Pages
223-232
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Self-consistent non-empirical calculations of band structures of higher stage graphite intercalation compounds have been performed up to the 6-th stage by using the numerical-basis-set LCAO method. The calculations are carried out for a thin film of
n contiguous graphite layers bounded by two ionized intercalant layers. From these calculations, the charge distribution along the
c-axis and the stage dependence of the Fermi-level density of states are determined. It is clarified that the
c-axis charge distribution is extremely inhomogeneous and that the effect of the σ bands is essentially important in determining the charge distribution along the
c-axis. The measured stage dependence of the orbital contribution in the total magnetic susceptibility of alkali-metal compounds is discussed on the basis of the calculated results of the
c-axis charge distribution.
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Michihide Kitamura, Toshihiro Arai
1983 Volume 52 Issue 1 Pages
233-240
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The D.C. conductivity, thermoelectric power and photoconductivity have been measured for (As
2Se
3)
100−xGe
x (
x=0, 1, 5, 10) glasses. These data were systematically analyzed by the small polaron model. It might be concluded that the doping of Ge does not influence the dark carrier transport processes but remarkably influence the photocarrier one.
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Teruo Matsushita
1983 Volume 52 Issue 1 Pages
241-245
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The surface barrier model originally proposed by Bean and Livingston is reinvestigated by taking account of the thermodynamic characteristics of a superconductor. The result shows that the first penetration of the fluxoids occurs at the very vicinity of the lower critical field
Hc1 for a superconductor with spatial dimensions much larger than the penetration depth. The image force is not effective to retard the first penetration of the fluxoids. It is concluded that the surface irreversibility in the mixed state does not originate from the mechanism of the surface barrier.
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Nobuyuki Nakagiri, Yoshiaki Yamamoto, Motoyuki Nomura, Hironobu Fujii, ...
1983 Volume 52 Issue 1 Pages
246-249
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Measurement of the Curie temperature was made on the (Co
1−xMn
x)
2P, 0.3≤
x≤0.7, compounds by the ac susceptibility under pressure up to 60 kbar. The Curie temperature
Tc of each concentration increased with increasing pressure and was represented by a function of pressure,
P, as
Tc=
Tc0+α
P+β
P2. The constants
Tc0 (
Tc at
P=0), α and β took maxima in the vicinity of
x=0.5. The results obtained are analyzed on the basis of the pair interaction model, and it was suggested that the interatomic-distance dependence of the exchange interaction energy between the Mn atoms oscillates.
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Haruhiko Suzuki, Yumiko Masuda, Masafumi Miyamoto
1983 Volume 52 Issue 1 Pages
250-253
Published: January 15, 1983
Released on J-STAGE: May 29, 2007
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A magnetic susceptibility in NdVO
4 was measured in the temperature range of 10 mK to 300 K. An ac magnetic susceptibility along the
c-axis of the crystal showed an antiferromagnetic parallel susceptibility with the Néel temperature
TN=820 mK. Along the
a-axis, the ac susceptibility showed a sharp peak at 840 mK. The peak can be understood by a pinning of the weak ferromagnetic domains. The specific heat was also measured below 1 K in zero and 1 T magnetic field. The field dependence of the Néel temperature was also investigated.
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Yoshiko Someya, Atsuko Ito, Koichi Katsumata
1983 Volume 52 Issue 1 Pages
254-262
Published: January 15, 1983
Released on J-STAGE: June 01, 2007
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Mössbauer spectroscopy has been applied to a random mixture with orthogonal spin anisotropies, Fe
1−xCo
xCl
2·2H
2O. The direction of an “individual Fe spin” of Co(Fe)-rich samples determined from the Mössbauer spectra was tilted even in the antiferromagnetic (AF) phase as well as in the mixed ordering phase. This means that, in the Co(Fe)-rich AF phase, although the spin component parallel to the easy axis of FeCl
2·2H
2O (CoCl
2·2H
2O) has no long-range order according to the neutron scattering measurement, the component exists on each lattice site statically at least in the time scale of
57Fe Mössbauer spectroscopy (∼10
−8 s).
The direction of an “individual Fe spin” has been shown to be strongly affected by the local environment around the Fe spin.
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Yoshitaka Kasamatsu, Tadamiki Hihara, Kenichi Kojima, Takahiko Kamigai ...
1983 Volume 52 Issue 1 Pages
263-266
Published: January 15, 1983
Released on J-STAGE: June 01, 2007
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The NMR frequencies of the
115In and
75As impurity nuclei in ferromagnetic iron have been measured as a function of the hydrostatic pressure up to 10 kbar at 195 and 273 K. Both the
115In and
75As NMR frequencies decrease linearly with increasing the pressure. The pressure dependences of the hyperfine fields are obtained as ∂ ln
115Hi⁄∂
p=−(2.25±0.05)×10
−7 bar
−1 and ∂ ln
75Hi⁄∂
p=−(9.84±0.05)×10
−7 bar
−1 at 195 K. The experimental results are qualitatively discussed, together with those for other nonmagnetic impurities in iron.
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Shigeo Kinno, Ryumyo Onaka
1983 Volume 52 Issue 1 Pages
267-271
Published: January 15, 1983
Released on J-STAGE: June 01, 2007
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The ESR spectra and the optical absorption spectra of γ-irradiated MgCl
2 single crystals, which have a layer ionic crystal structure, have been investigated. For a commercial reagent grade single crystal, an optical absorption band is found at about 3.35 eV, and a single broad magnetic resonance band in the ESR spectrum at
g=2.0009±0.0009, whose width is 50±5 G. From the measurements of the isothermal decay curves of these bands, it is found that these bands originate in the same lattice defect. An trapped electron center is proposed for a model of this defect. In a sample made by recrystallization of a commercial crystal, four hyperfine structure lines are found in the ESR spectrum. By assuming an axial symmetry, the values of
g⁄⁄=2.50±0.08,
g⊥=2.29±0.05,
A⁄⁄=4600±900 MHz and
A⊥=1400±500 MHz are obtained and Cl
0 center is proposed as a model.
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Muneaki Fujii, Hironori Nishihara, Akira Hirai
1983 Volume 52 Issue 1 Pages
272-278
Published: January 15, 1983
Released on J-STAGE: June 01, 2007
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The temperature dependences of the two NMR frequencies of
51V in V
3O
7 (239.6 MHz and 229.8 MHz, extrapolated to 0 K) have been measured down to 30 mk at zero external field. Below 0.2 K, the ‘frequency pulling’ is observed. The temperature dependence of the shift is not the same for the two
51V NMR signals. This result is explained satisfactorily by solving the coupled equations of motion for one electron spin and two nuclear spins.
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Hideo Takeuchi, Masanori Arakawa
1983 Volume 52 Issue 1 Pages
279-283
Published: January 15, 1983
Released on J-STAGE: June 01, 2007
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Results of EPR measurements of Cr
3+ in K
2ZnF
4 are reported for crystals co-doped with Na
+ or Li
+ ions. A few kinds of Cr
3+ centres are observed in both crystals, where parts of Cr
3+ are associated with charge compensators. In Na
+-doped crystal, the nearest Zn
2+-vacancy centre has comparable intensity with the uncompensated centre, but the nearest K
+-vacancy centre is not observed. In Li
+-doped crystal, the Zn
2+-vacancy centre is weak compared with the uncompensated centre, and the K
+-vacancy centre is also not observed, but a new centre having comparable intensity with the uncompensated centre appears. The new centre is attributed to Cr
3+ associated with Li
+ at the nearest Zn
2+ site. Fine structure parameters in the spin Hamiltonian are discussed by superposition of the two uniaxial terms along the crystal-tetragonal axis and bond axis to the charge compensator.
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Masaaki Kontani, Masatake Hayashi, Yoshika Masuda
1983 Volume 52 Issue 1 Pages
284-287
Published: January 15, 1983
Released on J-STAGE: June 01, 2007
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Nuclear spin relaxation for
51V in both the paramagnetic and ordered states of incommensurate antiferromagnetic Cr
1−xV
x (
x=0.01, 0.02, 0.03 and 0.038) alloys have been investigated in a temperature range between 1.3 and 300 K. The experimental results of the temperature dependence of the relaxation rate (
T1T)
−1 are interpreted in terms of the contribution of spin fluctuations, which behaves as (
T1T)
sf−1∝(
T−
TN)
−1⁄2 for
T>
TN, and the Korringa rate.
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Eiji Nakamura, Kiyoshi Deguchi, Kazuhiko Shimakawa, Yonez\={o} Fujimot ...
1983 Volume 52 Issue 1 Pages
288-294
Published: January 15, 1983
Released on J-STAGE: June 01, 2007
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The complex dielectric constant ε(ω) of Ca
2Sr(C
2H
5CO
2)
6 along the tetragonal
c-axis was measured at 54 different frequencies between 10
3 Hz and 10
9 Hz. In the paraelectric phase, ε(ω) is well described by the Debye dispersion formula with a single relaxation time except in the vicinity of the Curie temperature
Tc. In the temperature region of 0<
T−
Tc\lesssim3 K, the second dispersion of a resonant type is observed in addition to the Debye type dispersion. The temperature dependence of the relaxation time τ of the Debye dispersion is well expressed in the temperature range 1 K\lesssim
T−
Tc by a power law, τ∝(
T−
Tc)
−Δ with
Δ=1.31, which is larger than the critical exponent γ=1.28 for the static dielectric constant obtained by extrapolation of the Debye dispersion.
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