All issues
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 52, Issue 4
Displaying 1-50 of 65 articles from this issue
-
Yukio Okwamoto1983 Volume 52 Issue 4 Pages 1081-1083
Published: April 15, 1983
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe spectrum of the massless Thirring model at a finite fermion density is examined, using the Bethe ansatz, with the momentum cutoff. The cutoff procedure in this letter is valid for the model within the first order of the coupling constant.View full abstractDownload PDF (292K) -
Miki Wadati1983 Volume 52 Issue 4 Pages 1084-1085
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSClassical massless Thirring model in one dimensional space is studied. General solution and Lax pair are explicitly presented. Both results imply that the system is completely integrable.View full abstractDownload PDF (176K) -
Yasuo Morimoto1983 Volume 52 Issue 4 Pages 1086-1087
Published: April 15, 1983
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSAn oscillatory-nonoscillatory transition is induced in a blocking oscillator by connecting a variable resistor R parallel to the capacitor deciding the time constant of the circuit. For R<Rc(=4.990 kΩ) the oscillation cases. Define the controll parameter β as R/Rc−1. For β<0.8 the oscillation period Tp increases anomalously. Let the anomalously increased part be ΔTp then ΔTp∝β−1.0. Tp fluctuates for β<0.8 and the standard deviation of it δTp depends on β as δTp∝β−1.0. ΔTp and δTp are considered as characteristic parameters describing the transition in the blocking oscillator.View full abstractDownload PDF (208K) -
Ichiro Matsuzaki, Yoshimi Tsuchiya, Tatsuyuki Kawakubo1983 Volume 52 Issue 4 Pages 1088-1090
Published: April 15, 1983
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSWe have examined intermittent behavior in the successive electrohydrodynamic transitions to turbulence of nematic liquid crystals. The flatness which is a measure of the intermittency is found to enhance anomalously at the three transition points and decrease with increasing applied voltage in the turbulent region above the third enhancement point.View full abstractDownload PDF (340K) -
Yoh Itoh, Tomohisa Nakamura, Nobuo Kobayashi, Yazaburo Kaneko1983 Volume 52 Issue 4 Pages 1091-1094
Published: April 15, 1983
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIon energy-loss spectra for 1308 eV Kr+(2PJ) incident on N2, CO, NO and O2 were measured. For all molecules, fine-structure transitions between different J states of the projectile and vibrational excitations of the molecules were observed. In the case of N2 and NO, the spectra were relatively simple and only the excitations of fundamental vibrations were found. For CO and O2, the excitations of the harmonics, v=0→2, were also observed. In addition to these, for CO, the peak due to the process, Kr+(2P1⁄2)+CO(1Σ, v=0)→Kr+(2P3⁄2)+CO(1Σ, v′=1), was found. For O2, the peak due to the electronic excitation in the target, 3Σ→1Δ, was observed as well as the prominent peak corresponding to the process, Kr+(2P1⁄2)+O2(3Σ, v=0)→Kr+(2P3⁄2)+O2(1Δ, v′=0).View full abstractDownload PDF (428K) -
Yoshiyuki Aso, Kei-ichi Hirano1983 Volume 52 Issue 4 Pages 1095-1097
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA characteristic behavior of the plasma in an open field region of reversed field theta pinch has been studied with the guide field (GF) which extends the field line along the axial direction. The experimental result suggests that the rotational instability may be induced after the plasma touches the wall at the ends of the open field.View full abstractDownload PDF (312K) -
Eiichi Kuramoto, Yasuhisa Aono, Minoru Takenaka, Kazunori Kitajima1983 Volume 52 Issue 4 Pages 1098-1101
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPositron lifetime measurement and analysis were made for pure iron single crystals plastically deformed at room temperature and 77 K. Both second component I2 (175 psec, dislocations and jogs) and third component I3 (about 350 psec, vacancy clusters) in the specimen deformed at 77 K were larger than those in the specimen deformed at room temperature. It must be concluded that jogs in the low temperature deformed specimen play an important role in positron trapping and also in production of vacancies. However, the jog number density estimated from the experiment is too high, which suggests that some modification in the model of positron trapping by jogs may be required.View full abstractDownload PDF (332K) -
Takehiko Oguchi, Haruo Yoshida1983 Volume 52 Issue 4 Pages 1102-1104
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe three-state antiferromagnetic Potts model on d-dimensional hypercubic lattices is studied, where d is 2, 3, 4, 5 and 6. The Hamiltonian is expressed by the spin Hamiltonian with spin 1. The staggered susceptibility is calculated by the high temperature series expansion. By use of the ratio method and the Padé approximation, the critical temperature and the critical exponent γ are obtained. It is concluded that the three-state antiferromagnetic Potts model exhibits the second-order transition when d≥3.View full abstractDownload PDF (336K) -
Ikuo Tamura1983 Volume 52 Issue 4 Pages 1105-1107
Published: April 15, 1983
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSWe extend a previous model of a semi-infinite Ising ferromagnet with anisotropy so as to incorporate not only the surface effects on. anisotropy, but also those on exchange couplings into the model. The phase diagrams and the ordering temperatures for the surface magnetism of this extended model are examined by a new effective-field theory. The previous result that the surface cannot order before the bulk does when we take no account of the surface effects on the exchange couplings can be seen more clearly in those diagrams. The results obtained by a usual molecular-field theory are also given to compare with those of the effective-field theory.View full abstractDownload PDF (328K) -
Masashi Yoshida, Nobuhito Ohno, Kaizo Nakamura, Yoshio Nakai1983 Volume 52 Issue 4 Pages 1108-1110
Published: April 15, 1983
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSReflection and absorption spectra of InBrxI1−x mixed crystals have been measured at 2 K by using polarized light. The lowest reflection peak shifts continuously from InI to InBr indicating the intra-cationic nature of the first exciton transition. In the absorption spectra of the mixed crystals with low iodine concentration, zero-phonon indirect exciton transition is identified and concentration dependence of its threshold energy is investigated. It is confirmed that the indirect-direct crossover occurs at the composition x=0.5.View full abstractDownload PDF (288K) -
Yoji Koike, Seizo Morita, Tetsuo Fukase, Norio Kobayashi, Masami Okamu ...1983 Volume 52 Issue 4 Pages 1111-1114
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMagnetoresistance of Speer carbon resistors has been measured in the temperature range 0.05–4.2 K and in magnetic fields up to 84 kOe. Both negative and positive magnetoresistances (MR) have been observed. The negative MR becomes large with decreasing temperature and is proportional to H1⁄2 in weak magnetic fields below about 17 kOe and saturates in higher magnetic fields. On the other hand, the positive MR is notable in high magnetic fields and in the temperature range around 1 K. These results are discussed with recent theories of the Anderson localization.View full abstractDownload PDF (408K) -
Yoji Koike, Masami Okamura, Tetsuo Fukase1983 Volume 52 Issue 4 Pages 1115-1118
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIn granular bismuth, electrical resistivity with T1⁄2 dependence was observed in the low temperature range 0.5–4.2 K, while anomalous positive magnetoresistance was found in this range. This anomalous magnetoresistance, which increases with decreasing temperature, is farily well explained by the three-dimensional localization theory taking account of the effect of strong spin-orbit interaction. The spin-orbit scattering time τso is estimated as 4×10−13 sec, and the in elastic scattering time τε changes in proportion to T−2.7. On the other hand, T1⁄2 dependence of resistivity seems due to the interaction effect between electrons.View full abstractDownload PDF (432K) -
Norio Kawakami, Ayao Okiji1983 Volume 52 Issue 4 Pages 1119-1121
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWith the use of the exact solution, the coefficient of the electronic specific heat (\ ildeγ) for the asymmetric Anderson model is calculated in the presence of an arbitrary magnetic field. It is also shown that the relation (Remark: Graphics omitted.) holds exactly, where \ ildeχm and \ ildeχc are true magnetic and charge susceptibilities at finite magnetic fields.View full abstractDownload PDF (244K) -
Hiroyuki Nagai, Hiroshi Yoshie, Akira Tsujimura1983 Volume 52 Issue 4 Pages 1122-1123
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe NMR spectra of 89Y have been observed at 4.2 K to investigate the magnetic properties of Y(Fe1−xMnx)2. There are two kinds of Mn moments in low Mn-concentrations; one is antiparallel to the Fe moment and estimated to be 0.5 μB per Mn (low spin state), and the other is parallel to the Fe moment and has 2.7 μB per Mn (high spin state).View full abstractDownload PDF (236K) -
Toshio Osaka, Minoru Sumita, Yasuharu Makita1983 Volume 52 Issue 4 Pages 1124-1126
Published: April 15, 1983
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe pyroelectric charge of monoclinic RbD2PO4 along the b axis was measured through the lower transition temperature at 44°C (TII) and the D-E hysteresis curves were examined below TII. The D-E triple hysteresis loops were observed below TII, corresponding to the development of a small pyroelectric charge below TII.
It is clarified that the crystal is ferrielectric below TII with a small net polarization, 0.02 μC/cm2, compared with the spontaneous polarization of the sublattice, 1.8 μC/cm2, at 30°C.View full abstractDownload PDF (288K) -
Yu-ichi Miura, Masaaki Takashige, Terutaro Nakamura, W. N. Lawless, Mo ...1983 Volume 52 Issue 4 Pages 1127-1130
Published: April 15, 1983
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe dielectric constant of PbTiO3 in both amorphous and crystalline states has been measured down to 18 mK at several frequencies in the range between 0.3 and 100 kHz. In each state, the dielectric constant around 100 mK has a frequency-dependent minimum, which is characteristic of vitreous state.View full abstractDownload PDF (368K) -
Hiroshi Motegi, Kazuoki Kuramoto, Eiji Nakamura1983 Volume 52 Issue 4 Pages 1131-1133
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSComplex dielectric constants of KH2PO4 along the c- and a-axes have been measured in the frequency range from 10 Hz to 20 kHz. Dielectric dispersions of relaxation type with small loss peaks have been observed at temperatures below 10 K in both directions. Arrhenius plots of the relaxation frequencies give extremely small values of activation energies, 0.014 eV for the c-axis and 0.004 eV for the a-axis, respectively.View full abstractDownload PDF (236K) -
Masayuki Sekiguchi, Osamu Hashimoto, Yoshijiro Shida, Fuminori Soga1983 Volume 52 Issue 4 Pages 1134-1141
Published: April 15, 1983
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe second excited 11/2− state in 117Sn has been searched for by four different single-neutron transfer reactions, (d, t), (p, d), (d, p) and (3He, α). The state has been found at Eex=1.589 MeV, very near to the 13/2− and 15/2− states observed in an in-beam γ-ray study. These very closely degenerate states are possible three members of the quintet of the weak-coupling scheme [h11⁄2×2+] in this nucleus.View full abstractDownload PDF (920K) -
Jiro Ozaki, Yasuo Tomishima1983 Volume 52 Issue 4 Pages 1142-1147
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSCorrected results are shown anew to the energies and the equilibrium nuclear separations for πg state of H2+ ion in magnetic fields, which are reported incorrectly in the previous paper (J. Phys. Soc. Jpn. 49 (1980) 1497). The critical field strength for which the antibonding πg state changes to the bonding is between 0.1 and 1.0 in units of 2.35×109 G.
Similar calculations are also carried out for πu state. Numerical results obtained are in good agreement with those of others.View full abstractDownload PDF (452K) -
Hiroshi Itoh, Yukio Fukuda, Hisao Uchiki, Koichi Yamada, Masahiro Mats ...1983 Volume 52 Issue 4 Pages 1148-1156
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIntense stimulated emission from sodium vapor is observed at around 800 nm when it is pumped by a pulsed dye laser around 600 nm. The spectral lines are localized around 800 nm. To investigate the origin of this emission, we try to assign the stimulated lines excited by a dye laser at 632.8 nm (the wavelength of the He–Ne laser) and by a ruby laser at 694.3 nm. Moreover, the AΣ-XΣ transitions at 595.728 and 594.664 nm of a Na2 which are newly assigned by using the polarization labelling spectroscopy are excited by the output from a cw-dye-laser amplified with N2 laser-pumped dye amplifier, and some of the stimulated lines are assigned. It is then concluded that the origin of these stimulated emission lines is the AΣ-XΣ transition. Also it can be explained that these stimulated lines come from around the band edge of the AΣ-XΣ transition.View full abstractDownload PDF (1120K) -
Mikihiko Hirono, Tsuyoshi Suda1983 Volume 52 Issue 4 Pages 1157-1163
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe equivalent width of a single line with a super-Lorentz line shape has been expressed in terms of a function L(x, η) which reduces to the Ladenburg-Reiche function for the special case of η=2. Some values of the function L(x, η) have been tabulated. Band absorption by the spectral lines with a super-Lorentz line shape has also been calculated from the random model with a constant distribution of line intensities.View full abstractDownload PDF (620K) -
Determination of the Penning Excitation Cross Sections of Mg Atoms by He, Ne and Ar Metastable AtomsSeiki Inaba, Toshio Goto, Shuzo Hattori1983 Volume 52 Issue 4 Pages 1164-1167
Published: April 15, 1983
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe relative Penning excitation rates for the individual Mg(II) states by He(23S) atoms, those by He(21S) atoms and those by Ne(33P) atoms have been measured separately using Penning electron spectroscopy. The absolute values of the Penning excitation cross sections have been estimated by comparing the Penning electron energy spectrum for the Mg(II) ground state with that for the Zn(II) ground state. Using the same method, the Penning excitation cross section of Mg atoms by Ar(43P) atoms has been also estimated.View full abstractDownload PDF (452K) -
John D. Goddard, Michael L. Klein, Yoshiaki Ozaki1983 Volume 52 Issue 4 Pages 1168-1172
Published: April 15, 1983
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSAb initio potential energy curves are presented for (Na+)(NO2−) as a function of the Na–N separation. The minimum energy configuration (Remark: Graphics omitted.), is similar to that observed in the room temperature ferroelectric solid. Empirical atom-atom potential energy functions based in part on the ab initio calculations, are used in a molecular dynamics computer simulation of the molten salt.View full abstractDownload PDF (616K) -
Atsushi Matsumoto, Toshiko Sano, Tsuruji Iwai1983 Volume 52 Issue 4 Pages 1173-1177
Published: April 15, 1983
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe N2+ first-negative-band emission (B2Σu+→X2Σg+; Δv=0) has been observed in collisions of Arq+, Krq+ and Xeq+ (q=1 and 2) with N2 molecules at the collision energies of 2–8 keV. The relative emission cross-sections for the projectile ions are discussed in connection with the exothermicity of the one-electron capture process, Aq++N2→A(q−1)++N2+(B2Σu+).View full abstractDownload PDF (540K) -
Noriyoshi D\={o}hara1983 Volume 52 Issue 4 Pages 1178-1185
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe problem of unsteady heat transfer from a solid sphere, performing harmonic oscillations in an unbounded viscous fluid otherwise at rest, is investigated for small values of the Reynolds number. The analysis on the temperature field is carried out up to the third order of the Reynolds number. The time-averaged Nusselt number is obtained. The mechanisms of the oscillatory heat transfer are clarified theoretically.View full abstractDownload PDF (716K) -
Ryuji Takaki1983 Volume 52 Issue 4 Pages 1186-1193
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Nee-Kovasznay model is applied to the three turbulent shear flows; the wall region of the turbulent boundary layer, the plane mixing layer and the turbulent Rayleigh problem. The model equation is solved analytically, partly by the use of a technique analogous to the integral method for turbulence prediction. The former two applications are intended to determine the two unknown parameters in the model by comparing the theory with experiment, the results of which are A=0.20 and B=2.2. In the third problem approximate solutions for the mean velocity and the turbulent viscosity are obtained and compared with experiments. Agreements are satisfactory. The theory shows also some disagreements, which may be due to the lack of the concept of ‘coherent structure’ in the model.View full abstractDownload PDF (904K) -
Akira Yoshizawa1983 Volume 52 Issue 4 Pages 1194-1205
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA statistical theory is presented for the turbulent motion of an incompressible fluid subject to the Boussinesq convection. The Reynolds stress and the heat flux for arbitrary mean velocity and temperature distributions are calculated with the aid of the two-scale Direct-Interaction formalism, i.e., the DI formalism incorporated with the separation of scales of the mean and fluctuating fields. The two quantities are expressed in terms of binary correlations and responses of the fluctuating field, and these expressions are simplified by the use of the inertial-range theory. As an application of the results, a subgrid model is derived for the large-eddy simulation of turbulent shear flows with buoyancy effects.View full abstractDownload PDF (1016K) -
Jiro Mizushima, Kanefusa Gotoh1983 Volume 52 Issue 4 Pages 1206-1214
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe nonlinear evolution of the disturbance in a natural convection induced in a fluid layer between two parallel vertical walls kept at different temperatures is investigated on the basis of the weakly nonlinear theory. The theory is used in an improved form for the evaluation of the coefficients in the evolution equation of disturbance. The amplitude of disturbance and the heat transfer across the fluid layer are determined in a super-critical and equilibrium condition. It is found that the curve of the mean Nusselt number N versus the Grashof number G has a small hump at the critical Grashof number Gc, and that the estimation of N so far established is reasonable only in a narrow range of G close to Gc.View full abstractDownload PDF (864K) -
Chen Wu, Yoshiyuki Aso, Shun-ichi Himeno, Sataro Yamaguchi, Masao Okam ...1983 Volume 52 Issue 4 Pages 1215-1223
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMagnetic probe measurements show that the flux trapped into the neutral sheet radius at the early phase of the reversed field θ-pinch does not decrease monotonically but the two humps appear. The first one is coincident with the formation of the collisionless shock wave while the second one with its reflection at the center. The most probable origin of the electromotive force for these humps may be in the large rotational velocity difference between hydrogen ions and impurities’. In the first hump the velocity difference may be excited by the ion runaway (Gurevich) effect coupled with the imploding plasma. In the second hump it may be due to large off diagonal element Prθ of the ion pressure tensor created at the time of the reflection.View full abstractDownload PDF (1092K) -
Shingo Imazu, Juichi Irisawa, Saburo Takano1983 Volume 52 Issue 4 Pages 1224-1229
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe bremsstrahlung rates in fully ionized gases in a magnetic field are theoretically investigated. Here it is assumed that the charged particles have the Maxwell velocity distributions, and that an external electric field does not exists. In the theoretical treatment, the followings are considered: When the Larmor radius is larger than the radius of the collisional cross section due to the bremsstrahlung, the radiation of energy during a short time at an instant of the collision is not affected by the magnetic field. However, according to the gyration, the relative velocity between an electron and a colliding ion during the free path is affected by the magnetic field strength. Numerical calculations show that the bremsstrahlung rate in the presence of the magnetic field is smaller than that in the absence of the magnetic field.View full abstractDownload PDF (728K) -
Kiyotaka Hamamatsu1983 Volume 52 Issue 4 Pages 1230-1241
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSVlasov equilibria of a periodic array of axisymmetric double cusp plasmas are studied numerically for various values of β (ratio of the maximum plasma pressure to the maximum magnetic pressure at midplane of the double cusp vessel). Effects of finite Larmor radius, ambipolar potential and presence of cold plasma component are taken into account. It is shown that the plasma volume expands as β increases, forming a clear transition layer between plasma and vacuum with thickness of the order of the local ion Larmor radius in the high-β case. The stored energy in a single vessle increases rapidly with β. A strong ambipolar potential is formed either in the line cusp region or in the point cusp region, depending on the boundary conditions, and plasma expands radially in the central region. Cold electrons are gathered in the central region by the ambipolar potential, but the hot plasma component is little affected by the potential.View full abstractDownload PDF (1312K) -
Tsutomu Tetsuka, Akimitsu Nishizawa, Tsutomu Sakai, Kazuo Kawahata, At ...1983 Volume 52 Issue 4 Pages 1242-1250
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe small-scale density fluctuations have been studied by both millimeter (2 mm) and sub-millimeter (337 μm) wave scattering technique in JIPP T–II plasmas. Experiments were performed in two types of plasma: tokamak and stellarator plasmas. In both plasmas, the density fluctuations are localized in outer region of the plasma column, and show the characteristics of the drift wave mode turbulence. The density fluctuation level is \ ilden⁄n0\simeq1–1.5% around the plasma edge, and this value is inversely proportional to the mean electron density. Further, the dependence of the fluctuation level on the plasma parameters is studied and compared with the scaling law of the energy confinement time of the plasma. The diffusion coefficient estimated from the density fluctuation is about one third of the global diffusion coefficient.View full abstractDownload PDF (932K) -
Akio Ishida, Kazuo Kitao1983 Volume 52 Issue 4 Pages 1251-1254
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSRadial motion of a field-reversed ion layer is investigated theoretically in the limit of an extremely field-reversed thin layer. It is assumed that the ion layer consists of a fluid of rigidly rotating ions with finite temperature and a fluid of cold stationary electrons. It is shown that the ion layer radially vibrates as a whole with a frequency nearly equal to the betatron frequency of a single ion.View full abstractDownload PDF (380K) -
Shoji Kashida, Koichi Sano, Toshiro Fukumoto, Hiroyuki Kaga, Masahiro ...1983 Volume 52 Issue 4 Pages 1255-1260
Published: April 15, 1983
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe structural phase transitions in a linear chain compound (CH3)3NHCdCl3 were investigated by an X-ray photographic method. It was found that the high temperature phase above 374 K belongs to the orthorhombic Pbnm (Z=8) rather than to the hexagonal P63/m (Z=6) which was proposed by Chapuis and Zuniga. The structure of this high temperature phase was argued to be characterized by an orientationally disordered state of the trimethyl ammonium ions. An analogy to the triangular Ising lattice is also refered.View full abstractDownload PDF (772K) -
Sadao Hoshino, Takashi Sakuma, Hideshi Fujishita, Kaoru Shibata1983 Volume 52 Issue 4 Pages 1261-1269
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNeutron diffuse scattering from powder samples of α-AgI type superionic conductors AgI, Ag3SI and Ag2S was measured using a triple-axis spectrometer with a fixed position of the energy analyzer so as to measure only the elastic scattering caused by a disordered distribution of cations. The disorder scattering curves thus obtained were analyzed under the assumption that Ag atoms distribute over crystallographic 12(d) sites among the bcc lattice formed by anions, and probability functions αn for a simultaneous occupation in the n-th neighbor sites were obtained. The results are discussed comparing with the pair correlation function gAg-Ag(r) being obtained theoretically as well as by the analysis of X-ray diffuse scattering based on a liquid-like distribution model. The liquid phase of AgI was also studied by the same neutron technique and the results are discussed together with those for the solid phase.View full abstractDownload PDF (1212K) -
Minoru Tanaka1983 Volume 52 Issue 4 Pages 1270-1277
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSShort-range order of atoms in rapidly quenched states of a simple liquid metal simulated by the molecular dynamics method is investigated in detail by computing the triplet distribution function g(3)(r12, r23, r31). Splitting of the second peak of g(r) is shown to reflect strong equilateral triplet correlations at low temperatures in the second-neighbour shell around an arbitrary atom. A glass structure of the quenched state examined with g(3)(r, r, r) is understood as a distorted and imperfect f.c.c. packing: the nearest shell around an arbitrary atom consists of the f.c.c. nearest-neighbours, occupancy of the second nearest-neighbour sites is suppressed very much, and the subpeaks in the second-neighbour shell correspond to the third- and the fourth-nearest neighbours. Correlations beyond the second-neighbour shell are more diffuse and similar to a liquid structure.View full abstractDownload PDF (948K) -
Kazuo Nakanishi, Hiroyuki Shiba1983 Volume 52 Issue 4 Pages 1278-1289
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSCharge density wave (CDW) states of 2H-TaSe2 are studied on the basis of Jacobs and Walker’s free energy. Discommensuration (DC) structures are inspected in detail under the situation where the stable commensurate (C) state change from one to another as the interlayer coupling constant is increased. Numerical calculations, in which a sufficiently large number of harmonics are taken into account, exhibit double honeycomb, triangular and hexagonal DC structures. The formation mechanism of various DC structures is discussed and compared with McMillan’s DC diagram. Crossing over between different DC structures is also studied. Phase diagrams in the temperature and interlayer coupling plane are constructed to explain the re-entrant lock-in transition of 2H-TaSe2. In this connection a suggestion is made on the nature of the high-pressure C state.View full abstractDownload PDF (1504K) -
Yukikuni Akishige, Tsutomu Kubota, Kikuo Ohi1983 Volume 52 Issue 4 Pages 1290-1297
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTemperature dependence of ESR line shape associated with Fe3+ in Sr2Nb2O7 has been studied. The line shape is analyzed in terms of the incommensurate modulation of the fine structure tensor (D and E). The plane wave modulation model is a good approximation in the temperature range from 220°C to 120°C. The critical index β for the amplitude of the modulation wave is 0.34±0.02 in the temperature range. Below 120°C, the soliton model is a good description for the modulation wave.View full abstractDownload PDF (928K) -
Mitsuo Kawano, Kazutoshi Ohashi, Yoshiko H. Ohashi, Mitsuru Fukuchi1983 Volume 52 Issue 4 Pages 1298-1305
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe have investigated the mean-square displacement of dislocation axis in a two-dimensional Wigner lattice and the results are applied to the effects of quantum fluctuations to dislocation core. The core size is of the order of an inter-particle spacing.View full abstractDownload PDF (792K) -
Shûzi Harada1983 Volume 52 Issue 4 Pages 1306-1310
Published: April 15, 1983
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThermal expansion coefficient and Young’s modulus of hydrogenated fcc Fe–Ni Invar alloys have been measured as a function of temperature and hydrogen concentration. Anomalous behaviour in thermal expansion and Young’s modulus of the Invar alloys was faded with hydrogenation. This change corresponds to the disappearance of the characteristic weak ferromagnetic states of Fe–Ni Invar alloys, which was previously investigated by means of Mössbauer effect. The experimental results of thermal expansion, Young’s modulus and Mössbauer effect was interpreted on the basis of the electron theory.View full abstractDownload PDF (588K) -
Susumu Kurihara1983 Volume 52 Issue 4 Pages 1311-1316
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt is predicted that spin-singlet superfluidity can be realized in a submonolayer 3He film on the surface of thin film of superfluid 4He. The basic mechanism of the superfluidity is the attraction between 3He quasi particles arising from exchange of virtual third sound quanta.
It is argued that the superfluid transition of 3He film is of Kosterlitz-Thouless nature if the 4He film is thick, and changes its nature as the 4He thickness is reduced, with a crossover thickness of ∼2 atomic layers.
Several experiments are suggested to detect the new phase transition, to test whether the proposed mechanism is really working, and to examine the nature of the transition. The transition temperature is estimated to be in a temperature range attainable with a dilution refrigerator.View full abstractDownload PDF (828K) -
Kazuto Hirata, Michihiko Kitao, Shoji Yamada1983 Volume 52 Issue 4 Pages 1317-1323
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA.c. conductivity of glassy As40Se60Agx (x=0∼0.5) was measured at temperatures from 77 K to 400 K in the frequency range from 30 Hz to 5 MHz. Below 1 MHz, the a.c. conductivity σac(ω) is proportional to ωs. In As2Se3 sample (x=0), the value of σac(ω) depends linearly on the frequency and is nearly independent of temperature. In the samples containing silver, σac(ω) increases with silver content, especially at high temperatures and low frequencies. Value of the exponent s is about 1.0 at 80 K, and decreases to 0.5 at 350 K. Temperature dependence of σac(ω) and s in both samples is reasonably interpreted by the correlated barrier hopping model. Numerical calculations in the cases of bipolarons and single-polarons agree well with the experimental results on the samples without silver and those containing silver, respectively.View full abstractDownload PDF (824K) -
Masahiro Akinaga, Tomio Inoue, Shoichi Mase1983 Volume 52 Issue 4 Pages 1324-1332
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe quantum oscillations of sound velocity in dilute Bi1−xSbx alloys with x=0, 1.0×10−4 and 3.6×10−4 have been investigated under the condition that the magnetic field vector H has been applied perpendicularly or nearly perpendicularly to the sound wave vector q. The oscillation-amplitudes in the alloys have been found to be greatly enhanced compared with those in pure bismuth. These are analized on the basis of a theory which takes account of the contributions from the limiting point carriers, from the carriers on the nonextremal orbits and the electron-hole recombination process due to the carriers on the extremal orbits. It is shown that the remarkable enhancement in amplitudes is mainly caused by a coupling of two affairs, i.e., one order shorter electron-hole recombination time in the alloys than that in pure bismuth and the contribution from the limiting point carriers as in the case of the attenuation coefficient.View full abstractDownload PDF (1024K) -
Kazushige Machida1983 Volume 52 Issue 4 Pages 1333-1340
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe coexistence state of the spin density wave due to the itinerant electrons and superconductivity is further studied focusing on its electromagnetic properties within the same simple electron band model as used previously by the author. Anisotropic penetration depth and static electronic susceptibility are calculated. A brief discussion on recent far-infrared transmission experiments of (TMTSF)2ClO4 at low temperatures is given.View full abstractDownload PDF (848K) -
Osamu Sakai, Michitaka Suzuki, Sadamichi Maekawa, Masashi Tachiki, Geo ...1983 Volume 52 Issue 4 Pages 1341-1351
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe lower and the upper critical fields Hc1 and Hc2, and the slope of magnetization at Hc2, (∂M⁄∂H)c2, are calculated in ferromagnetic superconductors. The theory takes account of the electromagnetic and the s-f exchange interactions between conduction electrons and localized f-electrons. When temperature decreases, (∂M⁄∂H)c2 in the mixed state increases and diverges at a certain temperature. This indicates that below this temperature, the transition at Hc2 is of a first order. Near the spin ordering temperature, Hc2 decreases more rapidly than Hc1 with decreasing temperature. The theoretical results are compared with experimental results in single crystals ErRh4B4 in detail.View full abstractDownload PDF (1268K) -
Sadamichi Maekawa, Hiromichi Ebisawa, Hidetoshi Fukuyama1983 Volume 52 Issue 4 Pages 1352-1360
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe upper critical field in two-dimensional superconductors is calculated by taking into account quantum corrections due to the Anderson localization to the theory of dirty superconductors in the order of (εFτ0)−1 where εF and τ0 are the Fermi energy and the relaxation time of an electron, respectively. The upper critical field is enhanced at low temperatures. This is because the diffusion constant of electrons is depressed and the Coulomb repulsive interaction modified by the localization becomes small in the magnetic field. Discussion is given on the upward curvature of upper critical field of layered superconductors in the field perpendicular to the layers.View full abstractDownload PDF (956K) -
Kunihiko Yamaji1983 Volume 52 Issue 4 Pages 1361-1372
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNear the SDW-normal phase boundary obtained previously as a function of the transverse transfer energy t′ on a quasi 1D Hubbard model, the purely superconducting state is found to extend into the SDW region, once it appears in the normal region. The titled boundary is calculated on the basis of the above-mentioned model added with an anisotropic BCS-type interaction. The obtained curve well reproduces the observed TP phase diagram, if we take t′≅300 kB and dt′⁄dP∼0.6 kB/kbar. A new RPA expression of the anisotropic plasma frequency for the present model provides the value of t′ in remarkable agreement with the above estimate. Examination of the coupled equations for the two kinds of order parameters leads to conclude no microscopic coexistence of them. Quasi 1D conductors are argued to be favorable to realize the triplet superconductivity.View full abstractDownload PDF (1352K) -
Hidenori Kubo, Yoshio Suzuki, Mitsuho Tanimoto, Norikiyo Uryû1983 Volume 52 Issue 4 Pages 1373-1381
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNMR measurements of Cu nuclei are carried out in the ferromagnetic region of these mixed crystals to clarify the dependences of the hyperfine field, Hhf, and the quadrupole frequency, νQ, on the surrounding ligand ions. Since the Cu2+ ground state is given by d(x2−y2), the obtained values of Hhf and νQ are due to the number, n, of Br− ions in the four ligands on the x- and y-axes and are fitted by the experimental formula, Hhfμ=Hhfμ(0)+khfμn (μ: x, y, z) and νQ=νQ(0)+kQn, where k is the proportional constant. The differences between the hyperfine field along the x-axis and the y-axis are observed and are interpreted by the deviation from the tetragonal crystalline field.View full abstractDownload PDF (984K) -
Hiroyuki Shiba, Naoshi Suzuki1983 Volume 52 Issue 4 Pages 1382-1386
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA theoretical examination is made on whether the triple-Q incommensurate magnetic structure can be realized in RbFeCl3-type magnets. A comparison of free energies among the single-Q, double-Q and triple-Q states shows that there is a good chance to have the triple-Q phase in this system. An argument based on the ε expansion is also presented in this connection.View full abstractDownload PDF (564K) -
Takeshi Kanomata, Kiwamu Shirakawa, Takejiro Kaneko1983 Volume 52 Issue 4 Pages 1387-1393
Published: April 15, 1983
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe pressure derivative of the Curie temperature ∂Tc⁄∂p of CuCr2Se4−xBrx (0.0≤x≤1.0) have been obtained from the results of measurement of temperature dependence of initial permeability (μ) at various pressures. The Curie temperature decreases linearly with pressure for all of as-prepared samples. The magnitude of the negative value of ∂Tc⁄∂p for CuCr2Se4−xBrx decreases with increasing Br content from −1.67 K/kbar at x=0.0 to −0.35 K/kbar at x=0.8. The pressure effect on the magnetization of CuCr2Se4−xBrx has also been studied by the forced magnetostriction. On the basis of these results, the composition dependences of the Curie temperature, the magnetization and the exchange interaction are determined. Moreover, the strain dependence of the exchange interaction is also obtained. The exchange striction is also studied for CuCr2Se3.5Br0.5.View full abstractDownload PDF (744K)