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Volume 54, Issue 5
Displaying 1-50 of 55 articles from this issue
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Yukiharu Ohsawa1985 Volume 54 Issue 5 Pages 1657-1660
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA 2−1⁄2 dimensional relativistic electromagnetic particle code is used to study a time evolution of a selfconsistent nonlinear magnetosonic pulse propagating obliquely to a magnetic field. It is shown that the shock wave traps some ions and resonantly accelerates them parallel to the wave front. This acceleration is most efficient when the propagation angle is in the region θc\lesssimθ≤π⁄2, where θc= arctan ((mi⁄me)1⁄2−(me⁄mi)1⁄2).View full abstractDownload PDF (520K) -
Noriyoshi Sato, Rikizo Hatakeyama1985 Volume 54 Issue 5 Pages 1661-1664
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA new mechanism is proposed for an electrostatic ion cyclotron oscillation driven by applying an external potential to a small electrode immersed in a magnetized plasma. The mechanism is based on a direct plasma response to the applied potential, which gives rise to a two-dimensional relaxation oscillation in a magnetized plasma. The model of this two-dimensional potential-driven oscillation is well consistent with the measurements.View full abstractDownload PDF (492K) -
Sachio Watanabe1985 Volume 54 Issue 5 Pages 1665-1668
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSLocalization of an electron injected into a non-polar fluid near a critical point is investigated by minimization of free energy. The electron wave function is assumed to be a Gaussian type. It is proved that the localized state with fluid-density distortion around the electron exists as a stable state. The localization length of the electron and fluid-density distortion are calculated. In addition, the free energy and electron energy for the localized state are calculated. The localized state is a polaron state.View full abstractDownload PDF (440K) -
Madoka Tokumoto, Hiroyuki Anzai, Hiroshi Bando, Gunzi Saito, Nobumori ...1985 Volume 54 Issue 5 Pages 1669-1672
Published: May 15, 1985
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA measurement of the anisotropy of the upper critical field Hc2 in an organic superconductor β-(BEDT–TTF)2IBr2 is reported. A large anisotropy is observed with high critical fields when the magnetic field is applied in the crystallographic a-b plane and a low critical field in the perpendicular direction (Hc2a : Hc2b′ : Hc2c*\simeq25 : 24 : 1). The increased superconducting transition temperature (Tc=2.2–2.3 K with the onset at 2.8 K), compared with the isostructural β-(BEDT–TTF)2I3, is attributed to the decreased lattice parameters.View full abstractDownload PDF (440K) -
Shinya Waki, Yuji Yamaguchi, Kazuyoshi Mitsugi1985 Volume 54 Issue 5 Pages 1673-1676
Published: May 15, 1985
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSSuperconductivity are reported for three ternary compounds with Heusler type structure Ni2NbX (X=Al, Ga, Sn). Critical temperatures up to 2.9 K are observed from the electrical resistivity and the specific heat measurement. Electron-phonon coupling constants calculated using McMillan’s formula indicate that these compounds are intermediate-coupled superconductors.View full abstractDownload PDF (344K) -
Fumitaka Matsubara1985 Volume 54 Issue 5 Pages 1677-1680
Published: May 15, 1985
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIt is argued that impurities in a system with frustrating interactions play a similar role as random fields in a usual ferromagnetic system and destroy a periodic spin structure of the system. Results of Monte Carlo studies of a dilute antiferromagnetic Ising model on the triangular and the hexagonal lattices, which confirm our arguments, are also presented.View full abstractDownload PDF (576K) -
P. Nordblad, L. Lundgren1985 Volume 54 Issue 5 Pages 1681-1684
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBy analyzing fundamental experimental observations of the field and time dependence of the magnetic susceptibility of spin glasses we infer that the sole significance of the spin glass freezing temperature, Tg, is that the equilibrium susceptibility attains an upper limit at this temperature. This upper limit to the equilibrium susceptibility is strongly field dependent, whereas the relaxation rate of the spin system is only weakly field dependent and remains virtually unchanged through Tg.View full abstractDownload PDF (512K) -
E. F. Sarmento, Takahito Kaneyoshi1985 Volume 54 Issue 5 Pages 1685-1688
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSUsing the ferromagnetic stability condition, the phase diagram is investigated in a quenched bond-mixed Ising ferromagnet with a transverse field Ω on the square lattice. The fact that large families of critical lines for negative-bond mixture meet at a single point on the line of T=0 is found to be closely related with frustrations due to negative bond. However the effect of frustrations may be observed only for a small value of Ω on the relevant physical properties.View full abstractDownload PDF (436K) -
Yoshikazu Nishihara, Yuji Yamaguchi1985 Volume 54 Issue 5 Pages 1689-1692
Published: May 15, 1985
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESS(Sc0.35Ti0.65)Fe2 having the hexagonal Laves phase structure is a ferromagnet with the Curie temperature of 360 K. The ferromagnetic moment changes from 1.3 to 0.9 μB around 70 K with increasing temperature. The transition is of the first order. The longitudinal stiffness constant for spin fluctuations changes around 500 K. The magnetic state below 70 K seems to be the same state as that above 500 K and is more localized than the state between 70 and 500 K. The changes of the ferromagnetic moment and the longitudinal stiffness constant are explained as transitions between the two states with the different temperature variation of the local amplitude of spin fluctuations.View full abstractDownload PDF (472K) -
Kohei Yokoi, Yujiro Ohba1985 Volume 54 Issue 5 Pages 1693-1696
Published: May 15, 1985
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA new luminescence component was observed when anthracene crystals were excited by visible light under β-ray irradiation. It originates from the light-excitation of some excited state generated by β-ray irradiation. Though the spectrum agrees with that of fluorescence and the lifetime is about 7 ms, it is not the normal delayed fluorescence resulting from triplet-triplet annihilation. A remarkable difference from the luminescence which has ever been observed is the existence of a threshold in the intensity of excitation light.View full abstractDownload PDF (440K) -
Ken-ichi Iso, Soichi Owa, Kimio Tsubono, Hiromasa Hirakawa1985 Volume 54 Issue 5 Pages 1697-1699
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe present the result of a preliminary experiment determining an upper limit of the density of the background gravitational radiation at 8.6 kHz. The outputs of a pair of resonant antennas operating at room temperature are directly correlated retaining their phases. After 50 hours of observation, the energy density of the radiation is found to be (1.0±1.2)×10−5 J m−3Hz−1.View full abstractDownload PDF (236K) -
Shunji Kawamoto1985 Volume 54 Issue 5 Pages 1701-1709
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA construction of stationary solitary wave solutions to nonlinear partial differential equations is presented. First, it is shown that one of fifty Painlevé-type ordinary differential equations intimately connects with one-soliton solutions which are stationary solitary wave ones of usual soliton equations. Secondly, if these solutions are named the “1st-class”, by extending the Painlevé-type equation, we can newly construct three kinds (sech2, sech and combined forms) of the “Nth-class” stationary solitary wave solutions through special potential functions expressed by elementary ones.View full abstractDownload PDF (800K) -
Miki Wadati, Atsuo Kuniba, Tetsuro Konishi1985 Volume 54 Issue 5 Pages 1710-1723
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThrough the quantum inverse scattering method the nonlinear Schrödinger model is studied for the attractive case. Making use of the bound state operators and the quantum Gelfand-Levitan equation, the matrix elements of the field operator φ(x) and the density operator φ+(x)φ(x) are explicitly calculated. Each matrix element is found to be expressed in a product form. Based on the results, the connection between classical soliton and the quantum field theory is investigated. It is shown that the wave form of the classical soliton is related to the matrix element of the field operator in the limit n→∞, where n is the particle number making the bound state. The powerfulness of the quantum Gelfand-Levitan equation is stressed.View full abstractDownload PDF (1120K) -
Hidetoshi Miike, Kouji Ochiai, Hajime Hashimoto, Yoshio Ebina1985 Volume 54 Issue 5 Pages 1724-1729
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA dynamics of convective flow pattern observed in the electrohydrodynamic instability of nematic liquid crystal is investigated. Fluctuation of the pattern under ac-field is analysed by new dynamic image processing technique. The technique is based on a time-correlation analysis of a brightness change of each picture element. Spatial difference or local nature of the pattern dynamics is visualized by the image processing technique. Voltage dependence of the correlation function of the pattern fluctuation is discussed from the point of view of the successive transitions in far from equilibrium system.View full abstractDownload PDF (988K) -
Hatsuo Kimura, Huzio Nakano1985 Volume 54 Issue 5 Pages 1730-1736
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe surface tension γ is calculated in the mean field approximation in the system of rod-like molecules interacting via attraction as well as hard-core repulsion. It is found that the excluded volume effect favours the normal alignment of molecules at the free surface. The molecular orientations observed at the free surface are explained as an effect of counterbalance between the repulsive and attractive intermolecular forces as in the following: (1) normal to the surface (8CB, 5CB), (2) tilt against the surface, (3) transition between the normal and tilt orientations at a certain temperature T0 lower than the nematic-isotropic transition temperature Tc (MBBA, EBBA). The jump of γ at Tc obtained in this work agrees with the experimental results.View full abstractDownload PDF (752K) -
Shun-ichi Himeno, Masaharu Seki, Hitoshi Mochizuki, Takeaki Enoto, Tad ...1985 Volume 54 Issue 5 Pages 1737-1742
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA new and simple elliptical Abel inversion for calculating spatial distributions of electron density from elliptical shaped plasma is presented. In this numerical method inversion matrix elements were calculated analytically and examined using a test function. This method was applied to an end-on holographic interferogram of a θ-pinch plasma for the first time.View full abstractDownload PDF (552K) -
Tomohisa Nakamura, Nobuo Kobayashi, Yozaburo Kaneko1985 Volume 54 Issue 5 Pages 1743-1749
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSOne electron capture processes in the collision of Kr2+(3P2,1,0, 1D2, 1S0) with He and Ne are studied in the energy range from 0.5 to 1.3 keV with a high resolution ion energy-loss spectrometer. Possible reaction channels for each collision system were determined from the measured kinetic energies of the product Kr+. In the case of Kr2++He system, the reaction from Kr2+(1S0) state to Kr+(2PJ) state is a dominant process, whereas the reaction starting from Kr2+(1D2) state plays an important role in Kr2++Ne system. The cross sections of each reaction channel in Kr2++ Ne system are compared with each other. The cross sections, plotted against the crossing radius Rc of the potential energy curves estimated from the exothermicity, are peaked over a relatively narrow range of Rc from 2 Å to 6 Å and having a maximum at Rc=3 Å. It should be noted that this “reaction window” is composed of the data obtained for single collision system.View full abstractDownload PDF (768K) -
Akihiro Iwase, Shigemi Sasaki, Tadao Iwata, Takeshi Nihira1985 Volume 54 Issue 5 Pages 1750-1756
Published: May 15, 1985
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSStopping powers of Al and Ni for 35Cl and 12C ions have been measured by means of low temperature calorimetric technique. The energies of ions are 2.83–5.14 MeV/amu for Cl ions in Ni, 7.00–8.75 MeV/amu for C ions in Ni, and 3.34–4.09 MeV/amu for Cl ions in Al. The experimental results have been compared with other measurements, semi-empirical tabulations and theoretical calculations. The Bethe formula with the Z13 correction term and the Bloch correction term Provides the best fit to the experimental data.View full abstractDownload PDF (728K) -
Hiroyuki Nishimura, Atsunori Danjo, Hiroshi Sugahara1985 Volume 54 Issue 5 Pages 1757-1768
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDifferential cross sections (DCS’s) for the elastic scattering and the vibrational excitation of molecular hydrogen by electron impact have been measured in the energy range from 2.5 eV to 200 eV and in the angular range from 10° to 120°. Absolute values of the DCS’s are obtained by normalizing the relative values to the absolute elastic DCS’s for He by means of the relative flow method. Integral and momentum transfer cross sections for each scattering process are also given. Differential, integral and momentum transfer cross sections obtained in the present measurements are compared with the previous experimental and theoretical results.View full abstractDownload PDF (1480K) -
Yutaka Sasakura1985 Volume 54 Issue 5 Pages 1769-1781
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt is shown that for the heterogeneous swirling flow with non-negative density-gradient and non-negative velocity-density-dependent factors, the complex angular phase-velocity of the unstable m, k mode must lie within the semicircle C(κ) whose diameter is equal to b−a+(β−α)|κ| and center is located at [(b+a+(β+α)κ)⁄2, 0]. Here m and k are the azimuthal and axial wavenumbers. κ=k⁄m. a, b and α, β are the lower and upper bounds of the rotating and the axial velocity. The domain of angular phase-velocity for any unstable mode is constructed as a sum area in the upper half-plane enclosed by the two semicircles C(κM) and C(κm) and the tangential lines t0κM and t0κm if exist. Here t0κ means the line tangential to C(0) and C(κ). The maximum κM and the minimum κm of κ are determined by the instability condition. If the effects of rotational stratification, Rayleigh-Synge’s discriminant and axial flow are incorporated the semicircle is transformed into a semi-ellipse.View full abstractDownload PDF (1320K) -
Masaki Takashima, Hiromitsu Hamabata1985 Volume 54 Issue 5 Pages 1782-1788
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSLinear stability theory is applied to the problem of the stability of natural convection in a vertical fluid layer. It is assumed that the two side walls are maintained at constant and different temperatures and the fluid layer is heated by uniformly distributed internal heat sources. The power series method is used to obtain the eigenvalue equation which is then solved numerically. The stability conditions are obtained for wide range of the Prandtl number. The numerical results show that when internal heat sources are present the instability takes the form of travelling waves in the critical state and the critical wave speeds are always negative.View full abstractDownload PDF (660K) -
Jae-Tack Jeong, Moon-Uhn Kim1985 Volume 54 Issue 5 Pages 1789-1799
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTwo-dimensional slow viscous flow in a region bounded by a plane wall and an inclined semi-infinite flat plate at a distance is investigated on the basis of Stokes’ approximation. The motion is caused by the translation of the plane wall parallel to itself. A formal expression for the flow is obtained by solving a pair of simultaneous Wiener-Hopf equations. Streamlines and stress distributions on the plate are determined by evaluating the formal expression. The case in which the flow is caused by a pressure difference between up- and down-stream infinity with the plane wall at rest is also considered. When the plate is not perpendicular to the plane, it is found that separation occurs at the leading edge of the plate for both cases and that for the flow due to pressure difference a viscous eddy of which size diminishes as the inclination angle approaches 90° appears adjacent to the broader side of the plate.View full abstractDownload PDF (968K) -
Sanae-Inoue Itoh, Atsushi Fukuyama, Kimitaka Itoh, Kyoji Nishikawa1985 Volume 54 Issue 5 Pages 1800-1807
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNonlocal conductivity tensor is obtained to study the kinetic effects on propagation and absorption of radio frequency (rf) waves in dispersive plasmas. Generalized linear propagator in the presence of the inhomogeneity of magnetic field strength along the field line is calculated. The influence of the inhomogeneity to the rf wave-energy deposition is found to be appreciable. Application to toroidal plasmas is shown.View full abstractDownload PDF (900K) -
Sanae-Inoue Itoh, Atsushi Fukuyama, Kimitaka Itoh, Kyoji Nishikawa1985 Volume 54 Issue 5 Pages 1808-1812
Published: May 15, 1985
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDifferential formulation of the wave propagation equation in the inhomogeneous and dispersive plasma is derived by employing the nonlocal and kinetic conductivity tensor. The expressions of the associated power deposition and wave energy flux are also presented.View full abstractDownload PDF (480K) -
Yoshiomi Kondoh1985 Volume 54 Issue 5 Pages 1813-1822
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt is proved that both the global invariant with respect to helicity given by Taylor and that with respect to helical flux given by Kadomtsev are included in a generalized fundamental global invariant composed of poloidal and toroidal magnetic fluxes, which brings about the well-known force-free equilibria μ0j=λ0B as the minimum-magnetic-energy state. By implicating the plasma-wall interaction in the global constraint, we can obtain the minimum-energy state which satisfies the experimental boundary condition of j=0 at the wall. Formulation of an energy principle including the edge plasma effects for slightly resistive MHD plasmas is presented. Two typical numerical results of the Tokamak-like equilibria and the reversed-field-pinch equilibria are shown.View full abstractDownload PDF (1428K) -
Katsumi Ida, Isao Ochiai, Shunjiro Shinohara, Yoshio Nagayama, Hiroshi ...1985 Volume 54 Issue 5 Pages 1823-1829
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe effect of the current density profile on the limit of the safety factor q(a) in the non-circular tokamak TNT-A is described in this paper. The safety factor q(a) is measured by magnetic probes and one-turn loops. The current density profile is estimated from the shape of the plasma boundary with an equilibrium code. A gas puffing system and pulse forming network (PFN) circuit for the Joule current are used to control the profile. The limit of q(a) increases from 2.6 to 4.0 as the current density profile becomes flatter and the current density profile parameter enters the unstable region for the m=3 and 4 external kink modes. This limit of q(a) determines one of the boundary of the operational stable region in TNT-A.View full abstractDownload PDF (856K) -
Nobuo Mizuno, Haruyuki Irie, Masatomo Sato1985 Volume 54 Issue 5 Pages 1830-1842
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe velocity distribution of α-particles produced by D–T reactions in a magnetic mirror reactor is analyzed using the Fokker-Planck equation, which is integrated numerically after expanding the distribution function of α-particles in a series of eigenfunctions of the Legendre equation. Together with the distribution function, several quantities of interest are then evaluated. The influence of the velocity distributions of plasma electrons and ions on the α-particles is investigated by assuming two model functions, Maxwellian and non-Maxwellian, and it is shown that the form of the electron distribution at low speeds may have important effect on the α-particle distribution. The convergence property of the Legendre expansion is also discussed.View full abstractDownload PDF (1268K) -
Masahisa Ito, Hisashi Narumi, Tadashi Mizoguchi, Takaaki Kawamura, Hit ...1985 Volume 54 Issue 5 Pages 1843-1854
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAtomic structure of amorphous Mg–Zn alloys of near eutectic composition and the structural change toward the crystalline Mg51Zn20 under isothermal annealing at 350 K are investigated by X-ray diffraction and EXAFS. The structure factors and the reduced radial distribution functions obtained from the X-ray diffraction and the near neighbor partial radial distributions of Zn–Zn and Zn–Mg pairs from the EXAFS show that i) the amorphous state is random aggregate of chemical and structural units which have more or less regular polyhedral configurations and topologically similar to those in the crystalline Mg51Zn20, ii) in the first stage of annealing these units change their shape and size to enhance coherency in spatial relation with neighboring units, iii) in the second stage the units are further deformed to establish the long range order of the crystalline Mg51Zn20.View full abstractDownload PDF (1428K) -
Eiichi Yagi, Shiho Nakamura, Takane Kobayashi, Kenji Watanabe, Yuh Fuk ...1985 Volume 54 Issue 5 Pages 1855-1860
Published: May 15, 1985
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSBy the channeling method using the nuclear reaction 1H(11B, α)αα, the lattice location of H in αNbH0.13−0.15 was determined at 155°C, and the effect of stress on the hydrogen location was investigated by introducing the internal stress by thermal cycling that gives rise to precipitation and redissolution of β phase. It is concluded that in the α-phase, hydrogen atoms occupy tetrahedral sites, and the location is not changed by such thermal cycling. Compared with the result on H in V, the present result indicates that the hydrogen location in Nb is less sensitive to the strain than in V.View full abstractDownload PDF (696K) -
Hiroaki Kamioka, Yoshio Sumino1985 Volume 54 Issue 5 Pages 1861-1867
Published: May 15, 1985
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSSound velocity and its attenuation during solidification process in tin-bismuth alloys of three different chemical compositions, Bi/(Bi+Sn)=57.0 wt% (eutectic), 63.5 and 66.7 wt% (hypereutectic), have been measured by the pulse transmission method. The frequency of sound used was 1 MHz. During solidification process, 57.0 the sound velocity and the attenuation in eutectic alloy showed continuous change with temperature, but those of hypereutectic alloys showed discontinuous change with temperature. By combining the present results with our previous data on sound velocity and attenuation in melting process, discussion was made on the ultrasonic behavior at melting point in simple binary system of tin-bismuth alloy.View full abstractDownload PDF (804K) -
Kazutoshi Gouhara, Norio Kato1985 Volume 54 Issue 5 Pages 1868-1881
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe intermediate phase (IP) between the α and β phases of quartz was studied by means of X-ray diffraction topography and a fine-beam Laue photography. It is an incommensurate phase characterized by six modulation vectors which are nearly parallel to ±bi directions but rotated either positively or negatively around the c-axis. The regions with the opposite rotation make a domain structure. The temperature dependence of the modulation vectors (q) was precisely determined. The “microtwins” model for IP is criticized by elementary diffraction theory and our observations; mainly (g, q) dependence of the satellite intensities where g is the reflection vector. A “configuration wave” model is more plausible. In addition, the principles and practical procedures in applying the Laue method to the quantitative study of satellite reflections are presented.View full abstractDownload PDF (2484K) -
Kazutoshi Gouhara, Norio Kato1985 Volume 54 Issue 5 Pages 1882-1889
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe behaviour of the transition of quartz in a range of 0.1 K immediately above the transition temperature (TC) was studied mainly in the cooling run from the intermediate phase (IP) to the α phase. Rod-like entitles parallel to the c-axis are formed, the thickness being an order of 30–100 μm. They cause an inhomogeneous strain in the crystal. This texture (super-modulated structure) is intrinsic since it exists more clearly when the α phase does not coexist in the specimen. It is transformed into the α phase at TC. It is suggested that the entity is a commensurate phase. In the final chapter, the structure of IP over the whole temperature range and the natures of transition from the β to the α phase through IP are discussed based on our observations including those of Part I (J. Phys. Soc. Jpn. 54 (1985)1868).View full abstractDownload PDF (2980K) -
Shin’ichi Takeda, Hideo Okazaki, Shigeru Tamaki1985 Volume 54 Issue 5 Pages 1890-1898
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe specific heats of liquid Se–Te alloys have been measured as a function of temperature. There have been large and maximum values in the specific heat curves of liquid Se1−xTex (x=0.2, 0.3 and 0.4) alloys. They are explained in terms of Schottky-type specific heats due to the transition from non-metallic two-fiold coordination to metallic coordination in the liquid state, in addition to the ordinal one which is known as the Dulong-Petit’s value.View full abstractDownload PDF (960K) -
Takeshi Furuno, Noriaki Sato, Satoru Kunii, Tadao Kasuya, Wataru Sasak ...1985 Volume 54 Issue 5 Pages 1899-1905
Published: May 15, 1985
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSSpecific heat measurements have been done on the samples of Ce1−xLaxB6 (x=0, 0.03, 0.10 and 0.25) at low temperatures down to 0.1 K under the magnetic field of 0, 6 and 36 kOe. In the ordered state specific heat consists of a T3-term and a large γT-term. The former originates from the excitation of antiferromagnetic spin wave and the latter is common in the dense Kondo systems. The γ-value is insensitive to the La-doping and the applied magnetic field as well as the type of magnetic ordering. The result is consistent with the Γ8 ground level model but with a substantial distortion. The present result is also consistent with the temperature dependence of resistivity in the same temperature range.View full abstractDownload PDF (608K) -
Hiroyuki Deguchi, Naotake Morita, Yoshitomo Karaki, Kazuyoshi Takeda, ...1985 Volume 54 Issue 5 Pages 1906-1911
Published: May 15, 1985
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSHeat capacities of H2, He4, Ar and N2 adsorbed in zeolite are measured in the temperature range between 2 K and 20 K. Results show no sign of peaks or jumps characteristic of the phase transition of either the first kind or the second kind in the case of bulk samples. Dependence on the amount of adsorption, cation replacement, and on the atoms or molecules adsorbed are reported.View full abstractDownload PDF (540K) -
Atsutaka Maeda, Michio Naito, Shoji Tanaka1985 Volume 54 Issue 5 Pages 1912-1922
Published: May 15, 1985
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSWe have studied the nonlinear conductivity and the accompanied broad band noise of monoclinic TaS3. The noise voltage becomes maximum just above the threshold field ET of the nonlinear conduction. For comparison, the same measurements were made for NbSe3 and the similar results were obtained. The generation of broad band noise is explained in terms of two valued process, and the number of degrees of freedom of the CDW motion, N, is estimated to be 109−10/cm3 in both of monoclinic TaS3 which is semiconducting at low temperatures, and NbSe3 which is metallic. This result indicates that the motion of the CDW’s is not described as that of a rigid body. N is found to decrease with decreasing temperature in monoclinic TaS3.View full abstractDownload PDF (1212K) -
Noriaki Sato, Akihiko Sumiyama, Satoru Kunii, Hiroshi Nagano, Tadao Ka ...1985 Volume 54 Issue 5 Pages 1923-1932
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMeasurements of electrical resistivity (37 mK≤T\lesssim780 K for CeB6), magnetoresistivity (H\lesssim100 kOe) and Hall resistivity (H\lesssim150 kOe, 4.2 K≤T≤53 K) have been done for single crystalline samples of CexLa1−xB6 (0.03≤x≤1). At very low temperatures, the T2 law of resistivity is confirmed. A kind of universality for A⁄γ2=α is found even for magnetically ordered CeB6. The concentration dependence of residual resistivity shows that an interaction effect between Kondo states appears sharply around x=0.1. The interaction is weak for x<0.1 and does not vary so much for 0.1≤x<1. The Hall resistivity is proportional to magnetic field up to 150 kOe and is independent of the temperature down to 4.2 K. The real value of the Kondo temperature is evaluated.View full abstractDownload PDF (1184K) -
Keiichiro Nasu1985 Volume 54 Issue 5 Pages 1933-1943
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA one-dimensional many-electron system with on-site electron-electron(e-e) and electron-phonon(e-p) interactions is studied in the context of polaron theory, so as to clarify the quantum effect of phonon on the phase diagram. Lattice distortions moving with electrons as well as a frozen one are taken into account by a variational method combined with mean field theory. The phase diagram is given in a tetrahedral coordinate, spanned by four parameters: inter-site transfer of electron T, e-e repulsion U, e-p coupling S and phonon energy ω. This “T–U–S–ω tetrahedron” is shown to be divided into CVW and SDW regions by the boundary S=U. In the CDW region, the polaron radius increases as the retardation effect increases, and in its long limit the superconducting state(SCS) becomes far unstable than CDW, while in its short limit, SCS is degenerate with CDW, indicating the importance of this radius in quantum-classic crossover.View full abstractDownload PDF (1428K) -
Kozo Okada, Akio Kotani1985 Volume 54 Issue 5 Pages 1944-1954
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNear the surface of ferromagnetic superconductors, the free energy difference between the single vortex state and the no vortex state is calculated as a function of the distance between the vortex and the surface for various values of temperature T and external magnetic field H0. It is shown that the vortex is bound near the surface at T<To under H0 higher than a critical value, where To is the characteristic temperature below which the external magnetic field penetrates into the crystal in an oscillatory fashion. The interaction between the vortex and the penetrating magnetic field plays an important role in the stability of the vortex near the surface. A possibility of the self-induced vortex state near the surface is predicted.View full abstractDownload PDF (1208K) -
Sadamichi Maekawa, Saburo Takahashi, Shin-ichi Kashiba, Masashi Tachik ...1985 Volume 54 Issue 5 Pages 1955-1963
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe present a theory for calculating the crystal field effects in Kondo systems of Ce compounds and alloys. By extending Abrikosov’s pseudofermion method, the static and dynamical susceptibilities are formulated as functions of the self-energy of the pseudofermions. The self-energy is self-consistently treated in the ladder approximation. It is shown that the crystal field is not constant but depends on temperature through the renormalization of the exchange interaction between Ce3+ ions and conduction electrons. The neutron quasi-elastic and inelastic scattering spectra and the static susceptibility are in good agreement with the experimental ones in the cubic Kondo system, CexLa1−xAl2. This agreement suggests that the present theory is applicable to many materials.View full abstractDownload PDF (972K) -
Yoshichika \={O}nuki, Yoshiaki Shimizu, Munekazu Nishihara, Yohichi Ma ...1985 Volume 54 Issue 5 Pages 1964-1974
Published: May 15, 1985
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSWe have measured the electrical resistivity, Hall coefficient, magnetoresistance, magnetic susceptibility and magnetization of a dense Kondo substance CexLa1−xCu6 (x=0–1). The dilute Kondo impurity state is found to be retained below x=0.1–0.2 in CexLa1−xCu6, having a constant value of the unitarity limit in the magnetic resistivity. On the other hand, the Kondo lattice is formed above x=0.8–0.9 because the magnetic resistivity decreases with the decrease of the temperature and the temperature dependence of negative magnetoresistance shows a minimum around 1 K.View full abstractDownload PDF (1048K) -
Koichi Nakao, Masahiro Hirano, Tachiro Tsushima, Shuichi Iida1985 Volume 54 Issue 5 Pages 1975-1988
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSContraction motions of stripe domains in several types of hard bubble suppressed LPE-garnet films are studied by a time-resolved observation technique. Saturation velocities observed are substantially larger than those observed in collapse and translation techniques. A clear asymmetry in domain wall velocities with respect to the polarity of the external in-plane field is observed. The general feature of the asymmetry does not depend on the types of in-plane magnetization layers.
It is concluded that horizontal Bloch lines punch through at surfaces with in-plane magnetization layers as well as at as-grown surfaces, after a certain number of horizontal Bloch lines have been accumulated. The overshoot up to 100 μm is observed and the number of accumulated horizontal Bloch lines in a stationary state is estimated to be several tens in a typical case.View full abstractDownload PDF (1280K) -
Toshikazu Sat\={o}, Takashi Nishioka, Yoshihito Miyako, Yuko Takeda, S ...1985 Volume 54 Issue 5 Pages 1989-1999
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSLow temperature behavior of a reentrant spin glass on Pd1−x−yFexMny was studied by magnetization measurement. In the magnetization measurement for the higher field than about 2 kOe, the spontaneous magnetization σs begins increasing at the ferromagnetic transition temperature Tc with decreasing temperature and continues increasing smoothly even below the spin glass transition temperature Tg. In the lower field measurement, σs tends to become smaller. In the sample where Tg is relatively close to Tc(Tc⁄Tg\lesssim1.5), the ferromagnetic stateis destroyed at Tg, while, in the other sample with Tc⁄Tg\gtrsim2, the ferromagnetic state seems to remain without destruction to the lowest temperatures experimented (∼2 K).View full abstractDownload PDF (1012K) -
Yuko Takeda, Setsu Morimoto, Atsuko Ito, Toshikazu Sato, Yoshihito Miy ...1985 Volume 54 Issue 5 Pages 2000-2008
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Mössbauer study has been made on the reentrant spin-glass state of Pd0.881Fe0.027Mn0.092 and Pd0.930Fe0.015Mn0.055. The anomalous increase of the average hyperfine field \barHhf, found in some alloys with the reentrant spin-glass transition, was clearly observed below the spin-glass transition temperature Tg. This can be explained as freezing of the transverse spin component at Tg. From the variation of the Mössbauer absorption intensity ratios with applied field, it has been shown that Fe spins behave partly ferromagnetic and partly like a spin-glass. We consider that this fact is an evidence for the coexistence of the spin-glass and ferromagnetic orderings. A model to explain our results has been proposed. It has been also shown that the spin-glass state is microscopically not much affected by magnetic fields up to 5 kOe, the maximum value examined.View full abstractDownload PDF (1096K) -
Kenji Shimizu1985 Volume 54 Issue 5 Pages 2009-2016
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSpin echo NMR measurements on 159Tb have been done in magnetically ordered state of the cubic Laves phase compounds Tb1−xGdxMn2 with 0≤x≤0.8 and Tb1−xLuxMn2 with 0≤x≤0.25. In the Tb1−xGdxMn2 compounds, the magnetic hyperfine field of Tb decreases from 3365 kOe for x=0.8 to 3336 kOe for x=0 and the magnitude of the electric quadrupole splitting of 159Tb is nearly constant within experimental uncertainty. In the Tb1−xLuxMn2 compounds, the transferred hyperfine field at Tb from the neighboring rare earth ions was estimated to be +20 kOe per rare earth spin. From the hyperfine field analysis of Tb in these compounds, the orbital polarization contribution is expected to the self polarization field due to the conduction electron polarization by the parent Tb3+ ion. An external magnetic field dependence of the spin echo intensity of 159Tb in TbMn2 was also investigated.View full abstractDownload PDF (992K) -
Yoshihiro Ishibashi1985 Volume 54 Issue 5 Pages 2017-2020
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe fundamental features of ferroelectric domain walls are studied on the basis of the model thermodynamic potential applicable to ferroelectrics, such as SC(NH2)2, which have incommensurate phases. The model, when discretized, describes kinks formed in a chain of atoms sitting on a substrate double minimum potential, where the nearest neighbor interaction is of the antiferro-type while the next nearest neighbor one is of the ferro-type. The spatial variation of an order parameter within the walls, the wall energy and the activation energy were calculated as functions of model parameters. The situation that the incommensurate phase is stabilized with decreasing temperatures, prior to the commensurate phase, is reflected in a special feature of spatial variation of the order parameter.View full abstractDownload PDF (408K) -
Transient Dielectric Behavior during the Commensurate-to-Incommensurate Phase Transition in Rb2ZnCl4Katsumi Hamano, Hideaki Sakata, Kenji Ema1985 Volume 54 Issue 5 Pages 2021-2031
Published: May 15, 1985
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe kinetic process of the commensurate-to-incommensurate phase transition in Rb2ZnCl4 has been studied by tracing the time variations of the polarization and dielectric constant during the transition induced by removing the applied high dc electric field from the sample. The polarization shows an abrupt dropat at the instant of field removal and then decays monotonically. The dielectric constant first increases, reaches a maximum and then decreases toward the thermal equilibrium value. The relaxation process slows down as Tc is approached from above. A qualitative explanation of the observed transient characteristics is presented on the basis of a nucleation model. It is suggested that at an early stage of the transition the nucleated discommensurations are spaced more widely than in the final thermal equilibrium state.View full abstractDownload PDF (1376K) -
Eiko Matsushita, Takeo Matsubara1985 Volume 54 Issue 5 Pages 2032-2036
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWithin the cluster approximation, a theory is given to explain the unusual temperature dependence of the lattice constants observed in the glassy phase of Rb1−x(NH4)xH2PO4. It is shown that the lattice constant a (or c) always expands (or contracts) below the glass transition point Tg irrespective of the value of x in the intermediate region.View full abstractDownload PDF (628K) -
Yosuke Kayanuma1985 Volume 54 Issue 5 Pages 2037-2046
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA simple stochastic model is presented describing the nonadiabatic transitions in the level crossing with fluctuating off-diagonal coupling, in which the fluctuation is assumed to obey the Markoffian Gaussian process. The probability P that the transition occurs from one diabatic state to another is calculated exactly in the two limiting situations: In the slow fluctuation limit, P is given by P=1−{1+(4πJ2⁄h|v|)}−1⁄2, where J is the averaged amplitude of the off-diagonal term and v is the velocity of the change of the energy difference between the crossing levels. In the rapid fluctuation limit, P is given by P={1−exp (−4πJ2⁄h|v|)}⁄2. The intermediate case is studied numerically by the Wiener-Hermite expansion method. Generally, P approaches not 1 but 1/2 in the limit of slow passage, namely, v→0.View full abstractDownload PDF (1268K) -
Shigeki Mitaku, Satoru Hoshi, Ryoichi Kataoka1985 Volume 54 Issue 5 Pages 2047-2054
Published: May 15, 1985
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe average hydrophobicity as well as the helix periodicity in the amino acid sequence were compared among filamentous proteins, α-type globular proteins and intrinsic membrane proteins, in order to study the correlation between the side chain arrangement and the environmental conditions around helices. Although the helix content of those proteins is equally high, the average hydrophobicity and the power spectral density at the helix period (3.6 residues per a turn) changed systematically among three kinds of proteins, revealing the systematic distribution of two types of helical segments: hydrophobic and amphiphilic helices. The analysis of partial sequences showed that the amphiphilic helix occurs at the interface between polar and nonpolar environment, while the hydrophobic helixis found in the interior of protein complex or membranes.View full abstractDownload PDF (1104K)