All issues
Volume 49 (1980)
- Issue 6 Pages 2093-
- Issue 5 Pages 1649-
- Issue 4 Pages 1205-
- Issue 3 Pages 847-
- Issue 2 Pages 435-
- Issue 1 Pages 1-
Predecessor
- Proceedings of the Physico-Mathematical Society of Japan. 3rd Series
- Proceedings of the Tokyo Mathematico-Physical Society. 2nd Series
- Tokyo Sugaku-Butsurigakukwai Kiji-Gaiyo
- Tokyo Sugaku-Butsurigakkwai Hokoku
- Tokyo Sugaku-Butsurigaku Kwai Kiji
- Tokyo Sugaku-Butsurigaku Kwai Kiji
- Tokyo Sugaku Kaisya Zasshi
Volume 49, Issue 6
Displaying 1-50 of 54 articles from this issue
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Masaki Hayashi, Saburo Homma, Kazuo Katsuura1980 Volume 49 Issue 6 Pages 2093-2102
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe 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(αs). 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.View full abstractDownload PDF (960K) -
Hiroyasu Ejiri, Yasuki Nagai, Hideyuki Sakai, Tokushi Shibata, Tadafum ...1980 Volume 49 Issue 6 Pages 2103-2113
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPre-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.View full abstractDownload PDF (1384K) -
Yohsei Iwata1980 Volume 49 Issue 6 Pages 2114-2121
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSRelative 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.View full abstractDownload PDF (812K) -
Ravinder Kaur, A. K. Sharma, S. S. Sooch, P. N. Trehan1980 Volume 49 Issue 6 Pages 2122-2128
Published: December 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe 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.View full abstractDownload PDF (696K) -
Yasuaki Hiwatari, Akira Ueda1980 Volume 49 Issue 6 Pages 2129-2135
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA simple version proposed in our previous paper for superionic conductors is applied to superionic CaF2. 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.View full abstractDownload PDF (1036K) -
Yuichi Okuda, Isao Yamada, Jun Watanabe, Taiichiro Haseda1980 Volume 49 Issue 6 Pages 2136-2140
Published: December 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe measurement of susceptibility in the randomly diluted two-dimensional Heisenberg-like ferromagnet K2CuxZn(1−x)F4 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 K2CuF4. The susceptibility for x=0.40 exhibits the Curie law with a slight deviation in the low temperature region.View full abstractDownload PDF (576K) -
Masayoshi Azuma1980 Volume 49 Issue 6 Pages 2141-2143
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEnergy 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.View full abstractDownload PDF (264K) -
Akio Kotani, Saburo Takahashi, Masashi Tachiki, Tomio Koyama, Hideki M ...1980 Volume 49 Issue 6 Pages 2144-2151
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEffective 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 hωq in the spin-spiral state is calculated at zero temperature. Reflecting a characteristic anisotropy of Jji(q), hωq 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 hωq has many energy gaps characteristic of the magnetic superconductor.View full abstractDownload PDF (832K) -
Mitsuru Tanimura, Norikiyo Uryû1980 Volume 49 Issue 6 Pages 2152-2158
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFor 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.View full abstractDownload PDF (764K) -
Takeshi Hiraoka1980 Volume 49 Issue 6 Pages 2159-2164
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMagnetization and extraordinary Hall effect (EHE) were measured on forrimagnetic compounds Er1−xYxFe2 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.View full abstractDownload PDF (792K) -
Kazuo Yamagata, Tooru Sakai1980 Volume 49 Issue 6 Pages 2165-2172
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMagnetization 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.View full abstractDownload PDF (868K) -
Tetsuhiko Okamoto, Hironobu Fujii, Kohji Eguchi, Hiroshi Fujiwara1980 Volume 49 Issue 6 Pages 2173-2178
Published: December 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSMeasurements 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.View full abstractDownload PDF (676K) -
Nuclear Spin-Lattice Relaxation Time of Non-Transition Element Impurities in Ferromagnetic Fe and NiMasahiro Matsumura, Takao Kohara, Kunisuke Asayama1980 Volume 49 Issue 6 Pages 2179-2182
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNuclear 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.View full abstractDownload PDF (452K) -
Akito Kakizaki, Hidenao Sugawara, Ichiro Nagakura, Takehiko Ishii1980 Volume 49 Issue 6 Pages 2183-2190
Published: December 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe 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 3d bands and weak structures ascribable to the P 3s band and the bonding bands of Mn 3d and P 3p electrons. Sharp Fermi edge is found in the Mn 3d band; the consequence is that Mn 3d 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 3p excitation. The possible origin of this enhancement is discussed.View full abstractDownload PDF (1052K) -
Haruki Toda, Yasuaki Nakagawa1980 Volume 49 Issue 6 Pages 2191-2197
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Faraday effect in Gd3Fe5O12, Y3Fe5O12, Y3GaxFe5−xO12 (x=0.272) and Y3−xBixFe5O12 (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.View full abstractDownload PDF (892K) -
Change of Magnetization in the Para-Process with Tension in One Direction for the Fe–Ni Invar AlloysYosiaki Tino, Yukihiro Nakaya1980 Volume 49 Issue 6 Pages 2198-2202
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAs 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.View full abstractDownload PDF (572K) -
Kiyoshi Shizuma, Masato Nishi, Toshiaki Fujita, Yasukazu Yoshizawa1980 Volume 49 Issue 6 Pages 2203-2207
Published: December 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDoppler 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.View full abstractDownload PDF (592K) -
Shuichi Iwabuchi1980 Volume 49 Issue 6 Pages 2208-2218
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe 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.View full abstractDownload PDF (1244K) -
Tatsuro Miyasato, Masao Tokumura, Minoru Toguchi, Fumio Akao1980 Volume 49 Issue 6 Pages 2219-2226
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe 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).View full abstractDownload PDF (888K) -
Toshio Ikeda1980 Volume 49 Issue 6 Pages 2227-2230
Published: December 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDiffusion measurements have been made for Cl2 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 Br2 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 Cl2 at the surface is −0.48±0.17 eV. This shows the exothermic reaction of Cl2 at the surface of KCl in contrast with the endothermic reaction of Br2 at the surface of KBr.View full abstractDownload PDF (552K) -
Sumitada Asano, Nobuhiko Yamashita1980 Volume 49 Issue 6 Pages 2231-2235
Published: December 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSEmission and excitation spectra of MgS: Sb3+ 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 Sb3+ centers in MgS are determined from the excitation spectra.View full abstractDownload PDF (552K) -
Yasuaki Masumoto, Shigeo Shionoya1980 Volume 49 Issue 6 Pages 2236-2242
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe 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.View full abstractDownload PDF (828K) -
Yasuo Takakusa, Toshio Hyodo1980 Volume 49 Issue 6 Pages 2243-2247
Published: December 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSPositron 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.View full abstractDownload PDF (636K) -
Toshio Hyodo, Jun-ichi Kasai, Yasuo Takakusa1980 Volume 49 Issue 6 Pages 2248-2254
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSRecently 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.View full abstractDownload PDF (928K) -
Yoshihiro Goto, Etsuro Sawaguchi1980 Volume 49 Issue 6 Pages 2255-2262
Published: December 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDielectric and elastic properties of RbH3(SeO3)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 RbH3(SeO3)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.View full abstractDownload PDF (1216K) -
Kiyoyasu Imai1980 Volume 49 Issue 6 Pages 2263-2269
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe 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+3b 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.View full abstractDownload PDF (852K) -
Hiroyuki Mashiyama1980 Volume 49 Issue 6 Pages 2270-2277
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSOn 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(CH3)4}2ZnCl4 and {N(CH3)4}2CoCl4, for example, and differs from those proposed for K2SeO4 and the isomorphous materials.View full abstractDownload PDF (832K) -
Katsumi Hamano, Yoshito Ikeda, Takayuki Fujimoto, Kenji Ema, Shunsuke ...1980 Volume 49 Issue 6 Pages 2278-2286
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMeasurements were made of the dielectric constant along the ferroelectric axis εa, the spontaneous polarization Ps and the heat capacity cp of Rb2ZnCl4 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 εa. It was found that εa 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.View full abstractDownload PDF (1160K) -
Akira Sakai, Itaru Tatsuzaki1980 Volume 49 Issue 6 Pages 2287-2295
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSRaman Spectra of RbH3(SeO3)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.View full abstractDownload PDF (924K) -
Hiroshi Ohkura, Kiyokazu Iwahana, Masaji Tanaka, Katsushi Tara, Koichi ...1980 Volume 49 Issue 6 Pages 2296-2304
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMagnetic 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 (εr1), 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 εr1 for KBr depends on photon energy and predominates the net spin mixing parameter (εt). 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 εt and those by other schools is clarified.View full abstractDownload PDF (1116K) -
Shunsuke Nakanishi, Takao Muramoto, Osamu Tamura, Tsuneo Hashi1980 Volume 49 Issue 6 Pages 2305-2313
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe 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 \barE(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.View full abstractDownload PDF (1168K) -
Hideo Onuki, Fuyuhiko Sugawara, Masahiro Hirano, Yuji Yamaguchi1980 Volume 49 Issue 6 Pages 2314-2316
Published: December 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSUPS spectra of perovskite fluorides KMF3(M: Mn, Fe, Co, Ni, Cu, Zn) were measured in the valence band region. The calculation, fitted to the observed spectra, of M 3dn−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 KZnF3 seems appreciable.View full abstractDownload PDF (360K) -
Teruaki Minagawa1980 Volume 49 Issue 6 Pages 2317-2318
Published: December 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSStructural polytypism in SnS2 and SnSe2 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 SnS2 and SnSe2 the type 18R with the Zhdanov symbol (1212)3 and space group R\bar3m is the most or second common polytype.View full abstractDownload PDF (240K) -
Michi-hiko Mannami, Kenji Kimura, Akira Kyoshima, Mitsuyoshi Matsushit ...1980 Volume 49 Issue 6 Pages 2319-2325
Published: December 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSPlanar 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.View full abstractDownload PDF (1116K) -
Kazuhiro Nozaki1980 Volume 49 Issue 6 Pages 2326-2330
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA 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.View full abstractDownload PDF (504K) -
Kunihiro Sato, Ryohei Itatani, Hiromu Momota1980 Volume 49 Issue 6 Pages 2331-2339
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAn 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.View full abstractDownload PDF (916K) -
Takashi Ohsawa1980 Volume 49 Issue 6 Pages 2340-2348
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA 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-ω0| 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-ω0)−2.View full abstractDownload PDF (968K) -
Mitsuhiro Nambu1980 Volume 49 Issue 6 Pages 2349-2356
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe 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.View full abstractDownload PDF (824K) -
Ikuo Ikeda, Beonguk Cheon, Hideo Akimune, Kenji Watanabe1980 Volume 49 Issue 6 Pages 2357-2363
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt 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.View full abstractDownload PDF (932K) -
Kazuya Uehara, Hiroshi Takeuchi, Tsuyoshi Imai, Takumi Yamamoto, Tsune ...1980 Volume 49 Issue 6 Pages 2364-2370
Published: December 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSPower 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.View full abstractDownload PDF (1000K) -
Mitsuaki Funakoshi1980 Volume 49 Issue 6 Pages 2371-2379
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSInitial-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 100h⁄\sqrtag (g=gravitational acceleration) to reach stationary Mach reflection patterns when ε=0.05.View full abstractDownload PDF (992K) -
Akira Nakamura1980 Volume 49 Issue 6 Pages 2380-2386
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBacklund transform of the cylindrical KdV equation, ut+6uux+uxxx+u⁄2t=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.View full abstractDownload PDF (648K) -
Moon-Uhn Kim1980 Volume 49 Issue 6 Pages 2387-2391
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTwo-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.View full abstractDownload PDF (376K) -
Shunichi Wakitani1980 Volume 49 Issue 6 Pages 2392-2399
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSLinear 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.View full abstractDownload PDF (836K) -
Ken-ichi Kusukawa, Yô Shimizu, Akira Shinoda1980 Volume 49 Issue 6 Pages 2400-2406
Published: December 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe 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.View full abstractDownload PDF (728K) -
Tsutomu Kawata, Jun-ichi Sakai1980 Volume 49 Issue 6 Pages 2407-2414
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe 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.View full abstractDownload PDF (736K) -
Ichiro Hatta, Hironobu Ikeda1980 Volume 49 Issue 6 Pages 2415
Published: December 15, 1980
Released on J-STAGE: May 29, 2007
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Bijay Krishna Chaudhuri, Tooru Atake, Suvra Ganguli, Hideaki Chihara1980 Volume 49 Issue 6 Pages 2416
Published: December 15, 1980
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (56K) -
H. Vogt, G. Neumann1980 Volume 49 Issue 6 Pages 2417-2418
Published: December 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (68K) -
Kenichi Kojima, Tadamiki Hihara, Takahiko Kamigaichi1980 Volume 49 Issue 6 Pages 2419-2420
Published: December 15, 1980
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe 153Eu NMR and differential susceptibilities of EuSe1−xSx 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.View full abstractDownload PDF (256K)