Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
Volume 54, Issue 10
Displaying 1-50 of 62 articles from this issue
  • Tohru Yoneyama
    1985 Volume 54 Issue 10 Pages 3653-3655
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Interacting (Int) Toda equations are proposed based on an interacting soliton picture which enables us to regard the N-soliton solution as a system of N interacting solitons. The solution of an Int Toda equation is shown to be proportional to a function of the solutions of the Flaschka equations, using only the knowledge of the forms of the equations concerned. Two alternative forms of the Flaschka equation are proposed.
    Download PDF (248K)
  • Akira Onuki
    1985 Volume 54 Issue 10 Pages 3656-3659
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The behavior of a polymer in dilute solution is examined in a Couette flow. It will be gradually stretched as the shear is increased above the smallest relaxation rate of a chain (∝ξ−3, ξ being the equilibrium size). Predictions are made on the non-Newtonian shear viscosity, light scattering, and birefringence.
    Download PDF (476K)
  • Ken Abe, Kazushige Maeda, Toshiyuki Ishimatsu, Tohru Kawamura, Kazuro ...
    1985 Volume 54 Issue 10 Pages 3660-3663
    Published: October 15, 1985
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Neutron spectra from the 26Mg(3He, n)28Si reaction were measured at bombarding energies of 23.1 and 45.5 MeV with a neutron TOF spectrometer. Neutron angular distributions for the transitions to the ground and 1.78-MeV 2+ states in 28Si have been analyzed with DWBA and coupled-channel calculations. All the experimental data are reproduced consistently on the basis of the one-step two-proton stripping process, when one uses the two-nucleon spectroscopic amplitudes obtained from a large-basis shell-model calculation. Contributions of two-step processes have turned out to be apparently small, but the experimental data of the 1.78-MeV state at 45.5 MeV bombarding energy are fitted satisfactorily only when two-step processes are taken into account.
    Download PDF (436K)
  • Yusuke Suetsugu, Akio Komori, Yoshinobu Kawai
    1985 Volume 54 Issue 10 Pages 3664-3667
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The drift instability due to collisions between electrons and neutral particles is destabilized as a standing wave in a plasma produced by a microwave. The instability, which is controlled by changing the neutral gas pressure, appears in the narrow range of the magnetic field. The measured wave properties, and dependence on plasma parameters are found to agree with the two-fluid stub-model theory.
    Download PDF (448K)
  • Tetsuya Ogawa, Hideki Miyaji, Kenjiro Asai
    1985 Volume 54 Issue 10 Pages 3668-3670
    Published: October 15, 1985
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    The size distribution of nodules on the surface of polypropylene films crystallized from the glass and subsequently annealed was studied. The origin of the nodule was the crystallite produced by the growth of many nuclei which were generated on crystallization from the glass and survived on annealing. The surviving nuclei grow until they collide with the neighbors. In this case, the size distribution of nodules is represented by that of Voronoi polygons. The agreement between observed and calculated ones is good.
    Download PDF (756K)
  • Kaoru Shibata, Sadao Hoshino
    1985 Volume 54 Issue 10 Pages 3671-3674
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The measurements of neutron TOF spectra of superionic conductor Ag3SI were carried out for its β-phase and quenched α-phase at room temperature. The spectra were analyzed by the use of a model function for the generalized density of states including a local vibrational mode and transverse acoustic modes. It was found that low energy excitations at hω\simeq2 meV existed not only in the β-phase but also in the quenched α-phase with α-AgI type structure. The narrow quasi-elastic central component due to the translational diffusion mode was also analyzed and the reasonable diffusion constants comparable with the known values of tonic conductivities were obtained.
    Download PDF (580K)
  • Takaaki Kawamura, Miki Hasebe, P. J. Dobson
    1985 Volume 54 Issue 10 Pages 3675-3678
    Published: October 15, 1985
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    The circular arc of unknown origin and diffuse streaks in RHEED reported by Miyake and Hayakawa are analysed and shown to indicate the presence of one dimensionally ordered atom chains on the surface.
    Download PDF (480K)
  • Kazuo Itoh, Yoshisato Sasaki, Sei-ich Tanuma, Yasukage Oda, Takayoshi ...
    1985 Volume 54 Issue 10 Pages 3679-3682
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Electrical conduction at low temperatures was studied for defective surface layers of silicon (thickness of 330–600 Å, electron concentration of ∼3×1019 cm−3) produced by ion implantation of phosphorus and subsequent thermal annealing at 480°C. Below 1–4 K, both effects of localization and Coulomb interaction in two dimensions were observed in ln T dependence of conductivity. Samples having thicker conductive layers showed \sqrtT dependence of conductivity due to the three dimensional localization effect in the temperature range between 1 and 7 K.
    Download PDF (536K)
  • Kensuke Hoshi, Humikazu Kiya, Nobuo M\={o}ri, Yoshikazu Nishihara, Yuj ...
    1985 Volume 54 Issue 10 Pages 3683-3685
    Published: October 15, 1985
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Electrical resistance and thermal expansion were measured on ferromagnetic Hf0.9Ta0.1Fe2 specimens under various pressures. A knee-like anomaly peak at the Curie temperature Tc is observed, and Tc decreases rapidly at a rate of about −7 K/kbar in pressure coefficient. Under pressure above 8 kbar abrupt changes in electrical resistance and thermal expansion are observed at lower temperature T1 and knee-like anomalies in both quantities are found at higher temperature T2. Pressure dependencies of Tc, T1 and T2 are obtained and a tricritical point is found to be located at 8.0±0.5 kbar and 285±5 K. These results suggest that an antiferromagnetic phase is induced under pressure above 8 kbar and in the temperature range between T1 and T2.
    Download PDF (268K)
  • Yoshio Kitaoka, Kenji Fujiwara, Yoh Kohori, Kunisuke Asayama, Yoshichi ...
    1985 Volume 54 Issue 10 Pages 3686-3689
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    63Cu nuclear spin-lattice relaxation rate (1⁄T1) in a Kondo lattice compound CeCu6 has been measured at zero external field down to 60 mK by the PQR technique. 1⁄T1 is almost temperature independent above 6 K, reflecting the Curie-Weiss behavior of the magnetic susceptibility. Below 6 K, 1⁄T1 becomes temperature dependent with decreasing temperature. Then below ∼0.2 K 1⁄T1 follows the T1T=const. relation, showing that the Fermi liquid state has set in. The cross-over from the magnetic regime to the non-magnetic Fermi liquid one has been explored in a typical Kondo lattice compound from a microscopical point of view.
    Download PDF (524K)
  • Sadamu Takeda, Hideaki Chihara
    1985 Volume 54 Issue 10 Pages 3690-3693
    Published: October 15, 1985
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    The Larmor frequency-dependence of the slowly-relaxing component of spin-lattice relaxation due to methyl rotation in solid γ-Si(CH3)4 is consistent with the tunneling frequencies of 15.8 and 24.0 MHz in the limit or uncoupled rotation. Inconsistencies among the published results and interpretations are discussed.
    Download PDF (464K)
  • Kazuo Gesi
    1985 Volume 54 Issue 10 Pages 3694-3696
    Published: October 15, 1985
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Single crystals of monoclinic Tl2ZnI4 were grown, and dielectric properties were measured. The crystal exhibits ferroelectricity below the Curie temperature of 209 K where the dielectric constant along the b-direction shows a λ-type maximum with the peak value of about 530. The spontaneous polarization at 180 K is about 1.2×10−2 C m−2.
    Download PDF (260K)
  • Hiroshi Yasaka, Akira Sakai, Toshirou Yagi
    1985 Volume 54 Issue 10 Pages 3697-3700
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    A central peak in the low-frequency Raman spectra of sodium nitrate has been observed in a temperature range from room temperature to above the phase transition point (TC). The central peak in the x(zz)y geometry is strongly dependent on temperature. Its intensity and width show an anomaly in temperature dependence near TC. The anomalous part of the intensity is well expressed by a function of temperature (TCT)1⁄2 with a critical index of the order parameter. The origin of the central peak is assigned to an intrinsic one, that is, a motion of NO3 ions which becomes active with increasing temperature.
    Download PDF (372K)
  • Noriko Saitoh, Shozo Takeno, Éi Iti Takizawa
    1985 Volume 54 Issue 10 Pages 3701-3707
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    New solutions of two- and three-(space)-dimensional generalized Toda lattice equations are given. The solutions are written by various forms of Bessel functions, and their properties are discussed in relation to cylindrical and spherical nonlinear modes in the systems. A discussion is also given to another type of nonlinear difference-differential equations, having the form of a generalized version of higher dimensional Toda lattice equation and exhibiting spherical nonlinear modes.
    Download PDF (704K)
  • Tsutomu Kawata
    1985 Volume 54 Issue 10 Pages 3708-3717
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    We study the partial-differential system (LPDE) obtained from linearization of a primitive nonlinear equation (NLPDE) integrable by virture of the N×N-matrix spectral problem. Solutions of the LPDE is exactly related with “squared eigenstates” appropriately defined in the spectral equation. The completeness of squared eigenstates is derived by applying the “Riemann-Hilbert” transformation (RHT) and triangular factorization procedure (TFP) for matrices. Finally the LPDE is integrated by using a Green function uniquely defined for the LPDE.
    Download PDF (975K)
  • Mituru Tanimura, Norikiyo Uryû
    1985 Volume 54 Issue 10 Pages 3718-3726
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    For the one-dimensional Ising model in which the interactions are usually confined in the limited range, an extension of the concept of exchange interaction has been made. In the case of unusual Ising models with arbitrary interactions between arbitrary spins some dual formula of the partition function is obtained in a closed form. In the present paper, part I, the derivation of its general formula and the application to some simple examples are shown.
    Download PDF (844K)
  • Miki Wadati
    1985 Volume 54 Issue 10 Pages 3727-3733
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The Bethe ansatz method for the quantum nonlinear Schrödinger model is reconstructed with emphasis on boson nature of the system. It is shown that bosonic counting of states with a “true” phase shift leads to a new formulation of the Bethe ansatz method. The conventional Yang-Yang’s method and the present method is complementary in the sense that the former (latter) gives a better description for strong (weak) coupling and low (high) temperature. An interesting boson-fermion correspondence in quantum completely integrable systems is observed.
    Download PDF (696K)
  • Yuzo Asano, Shigeki Mori, Masaharu Noguchi, Misao Sakano, Kazuaki Kato ...
    1985 Volume 54 Issue 10 Pages 3734-3741
    Published: October 15, 1985
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Formation cross sections of spallation and fission products in the nuclear reactions of tantalum, tungsten, and gold with 500-MeV protons were measured with a Ge(Li) γ-ray spectrometer followed by computer analysis of the spectra. The measured results for gold are in good agreement with existing data measured with 490-MeV protons. The tantalum data are only in qualitative agreement with data measured previously at 340 and 450 MeV. The mass dependence of the cross sections of the fission products for tantalum seems to be in agreement with the mass-yield curves obtained at 340 and 450 MeV. The mass-yield distributions for fission products may indicate that the fission process takes place at the middle or near the end of the evaporation process in the two step mechanism of high-energy proton-nucleus interactions.
    Download PDF (928K)
  • Keishi Ishii, Mineharu Suzuki, Junichi Takahashi
    1985 Volume 54 Issue 10 Pages 3742-3746
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Using the beam-foil technique with emphasis on high wavelength resolution in VUV region, radiative lifetimes have been measured for some excited levels in C, N and O ions. The line at 764.36 Å due to 2s2 2p 2P3⁄2-2s2p2 2S1⁄2 transition in N III was clearly resolved from a nearby lying line of N IV. Some of the irregularity existing in the systematic trend of oscillator strength along the isoelectronic sequence have been removed.
    Download PDF (548K)
  • Shinichiro Yanase, Kiyoshi Kohno
    1985 Volume 54 Issue 10 Pages 3747-3756
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The effect of a salinity gradient on the instability of natural convection in a vertical fluid layer between two parallel plates is investigated theoretically. Temperatures of the two plates are different by 2T0 and both a stable temperature gradient, β>0, and an unstable salinity gradient, βs>0, are present in the vertical direction. The stability is investigated for various values of β and βs in the case of the Prandtl number Pr=7 and the Schmidt number Sc=700, which corresponds to weak salt water. It is found that the stationary mode dominates the onset of instability if both β and βs are moderate, otherwise the travelling mode governs it.
    Download PDF (992K)
  • Tsutomu Tetsuka, Kazuo Kawahata, Shigeki Okajima, Akimitsu Nishizawa, ...
    1985 Volume 54 Issue 10 Pages 3757-3762
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    An HCN laser scattering technique is employed for detecting an electrostatic wave excited by ICRF heating on the JIPP T-IIU tokamak. The frequency spectra and wavenumber of the excited wave were observed during the heating. The measured wave is consistent with the theoretically estimated wave dispersion of the ion Bernstein wave which is mode-converted from the fast wave in the vicinity of the ion-ion hybrid resonance layer. The influence of MHD activity on the mode-converted ion Bernstein wave is examined. When the MHD activity grows and the plasma becomes unstable, the scattered signal from the ion Bernstein wave decreases, being accompanied with large fluctuations.
    Download PDF (880K)
  • Mitsuru Yamagiwa, Masao Okamoto
    1985 Volume 54 Issue 10 Pages 3763-3770
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Relaxation due to the Coulomb collisions of the electron velocity distribution function with a high energy tail is investigated in detail. In the course of the relaxation, a ‘saddle’ point can be created in velocity space owing to v−3 dependence of the deflection rate and a positive slope or a ‘dip’ appears in the tail direction. The time evolution of the electron tail is studied analytically. A comparison is made with numerical results by using a Fokker-Planck code. Also discussed is the kinetic instability concerned with the positive slope during the relaxation.
    Download PDF (904K)
  • Akira Sugiyama
    1985 Volume 54 Issue 10 Pages 3771-3784
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Following the preceding paper I, the formation energy of an intrinsic stacking fault, γSF, in an fcc metal is calculated as a function of the electron-atom ratio, (ea), in a range from 0.9 to 4.1 for the interionic potentials of the forms VPsincos (2kFr)⁄(2kFr)m with m=3, 4 and 5. In the calculation, the interplanar interactions are asymptotically expanded to the third order. The asymptotic expressions show that the Blandin-Friedel-Saada anomaly at (ea)≈1.140 is derived only from the expansion of the first order, and that the anomaly vanishes when we expand the asymptotic expressions to higher orders. Good accuracy in the calculation is confirmed by comparison of the binding energies of fcc and hcp lattices calculated from the interplanar interactions by the use of the Ewald-Fuchs method. Analytic expressions are given for the lattice sums appearing in the calculation of γSF.
    Download PDF (1232K)
  • Toshiro Fukumoto, Shoji Kashida
    1985 Volume 54 Issue 10 Pages 3785-3795
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The structural phase transition of a linear chain compound (CH3)3NHCdCl3 (TrMCC) was studied by X-ray diffraction method. Accompanying the phase transition from the (1×\sqrt3) structure to the (2×\sqrt3) structure, strong diffuse streaks were observed along the b* direction. In order to explain the observed peak profiles, a simplified model was presented. In this model, the layers made of rather tightly coupled CdCl3 chains were assumed to stack with probabilities. The diffraction intensity was analyzed using the matrix method given by Kakinoki and Komura. The calculation which incorporates the effect of the phase shift due to the displacements normal to the stacking direction was found to reproduce the experimental results fairly well. The streaks observed in the (3×2) phase were also discussed.
    Download PDF (1128K)
  • Shinya Hashimoto, Hiroshi Iwasaki, Ken-ichi Ohshima, Jimpei Harada, Ma ...
    1985 Volume 54 Issue 10 Pages 3796-3807
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    This paper describes the results of the first application of anomalous scattering phenomenon to reveal the local atomic arrangements in multi-component systems. Diffuse scattering from a single crystal of the title alloy has been measured using monochromated synchrotron radiation of the various wavelengths in the close vicinity of the K absorption edges of the constituent elements. From the variation of contrast produced in the total diffuse intensity, partial diffuse intensities corresponding to the three kinds of interatomic correlation have been derived by adopting a least-squares fitting method. It is shown that short-range ordering occurs between Ni and Zn atoms and also between Zn and Cu atoms, while a correlation of the opposite sense exists between Cu and Ni atoms. This type of short-range ordering is consistent with the prediction of ordering energies given by De Rooy et al.
    Download PDF (1636K)
  • Ikuo Suzuki, Yoshihiro Ishibashi
    1985 Volume 54 Issue 10 Pages 3808-3814
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The electric-field effects on the transitions in the improper ferroelectrics are discussed on the basis of the Landau-type thermodynamic potentials. The phase diagrams in the electric field vs temperature are drawn in the cases where the high temperature normal phase is not piezoelectric and the transition from it is of the first order. The qualitative difference in the obtained phase diagrams in the present and the previous paper is mentioned. The anomalies in the temperature dependence of transition parameters, the electric susceptibility and the elastic constant are discussed.
    Download PDF (692K)
  • Akira Inaba, James A. Morrison
    1985 Volume 54 Issue 10 Pages 3815-3819
    Published: October 15, 1985
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Heat capacity measurements on a crystal boule of KBr/NH4Br (0.5 mol%) have been extended down to T=0.08 K. In the region T>1.2 K, the results are in quantitative agreement with the heat capacity calculated for a “frozen-in” composition of nuclear spin symmetry species of the NH4+ ion corresponding to T=4.5±0.5 K. At lower temperatures, a spontaneous release of energy from the crystal is observed as well as an excess heat capacity which is much larger than the probable experimental uncertainty. Both effects can be accounted for on the assumption that the crystal contained 40 to 100 ppm of ortho—H2. It is probable that the molecular H2 was introduced during the growth of the crystal from the melt.
    Download PDF (576K)
  • Mitsutaka Fujita, Kazushige Machida, Hiizu Nakanishi
    1985 Volume 54 Issue 10 Pages 3820-3832
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    By taking into account magnetic field through the Zeeman effect the charge density wave state is discussed theoretically. The relative stability of various charge density wave states under applied fields are examined by utilizing a snoidal solution which is characterized by only a single periodicity but satisfies exactly a self-consistent equation for the Fröhlich model with a nearly half-filled band. The detailed phase diagram of the commensurate and incommensurate states, the energy gap structure, the wave number of the lattice modulation and the magnetization are calculated. From the obtained energy gap we discuss the applicability of our solution with the single wave length modulation. Possible experiments of field induced transitions on low dimensional Peierls systems under fields are proposed.
    Download PDF (1324K)
  • Akira Hasegawa, Akira Yanase
    1985 Volume 54 Issue 10 Pages 3833-3838
    Published: October 15, 1985
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    The one-electron energy band structure for the rare-earth intermetallic compound LaGe2, in which an anomalous specific heat and a superlattice structure have recently been found, is calculated by an APW method with a local-density approximation. Assuming that the superlattice structure may originate from a formation of the charge density wave state, the Fermi surface is investigated carefully. It consists of two sheets, a multiply-connected electron sheet and a multiply-connected hole sheet. A candidate for such flat pieces of the Fermi surface that are responsible for a formation of the charge density wave state with the observed period is a pair of the nearly flat sides of the box-shaped part of the electron sheet.
    Download PDF (820K)
  • Masahiro Isino, Yoshio Muto
    1985 Volume 54 Issue 10 Pages 3839-3847
    Published: October 15, 1985
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    The resistive behavior of vanadium-based alloys with iron up to 8 at% or with tantalum up to 10 at%, measured from 4 K up to room temperature, changes at a few at% with increasing solute concentration: Weak scatterers, tantalum atoms, change the concentration dependence of the resistivity, whereas strong scatterers, iron ones, change not only the concentration dependence but also the temperature dependence of the resistivity. The change at a few at% is relevant to the substantial overlap of the Friedel oscillation of the conduction electron density around each solute-atom site. The resistive behavior of concentrated V–Fe alloys shows that an unknown mechanism which causes the anomalous resistive behavior such as the negative temperature coefficient of the resistivity observed in high-resistivity alloys works even at low solute concentrations above a few at %.
    Download PDF (1300K)
  • Masahiro Isino
    1985 Volume 54 Issue 10 Pages 3848-3857
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Strong-scattering alloys among nonmagnetic binary transition metal alloys in the substitutionally disordered and liquid states are summarized to show common resistive behavior as for the concentration and temperature dependence of the resistivity, that is, both nearly constant concentration dependence and negative temperature coefficient of the excess resistivity. An analysis of the data on the resistivity and the superconductivity shows that the electron mean-free-path is inversely proportional to solute concentration and that the diffusion constant obtained from the resistivity data agrees well with that from the superconductivity data. Then, a picture that an electron moves freely and is scattered at solute-atom sites survives in concentrated strong-scattering alloys.
    Download PDF (1408K)
  • Yoshitake Ueda, Hiroki Hosoda, Takao Kino
    1985 Volume 54 Issue 10 Pages 3858-3867
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    A new method to obtain the surface resistivity ρs in one platelike sample is developed. The resistivity ρs is given as the difference between the high-field magnetoresistivity in the Sondheimer geometry and that in the MacDonald-Sarginson geometry. The bulk resistivity ρb is obtained from the apparent zero-field resistivity ρ0 subtracted by ρs. Using these values of ρ0 and ρb, the bulk mean free path lb is calculated according to the Fuchs-Sondheimer theory of the size effect for a thin film. This method has been applied to samples of zone-refined aluminium. For these samples a value of 0.18±0.01 fΩm2 has been obtained at 4.2 K for the specific surface resistivity. The product of ρb and lb is estimated to be 0.80±0.04 and 0.84±0.03 fΩm2 for the single-crystal and the polycrystalline samples, respectively.
    Download PDF (1316K)
  • Taizo Okazaki, Yoichi Hiruta, Kisaburo Shogenji
    1985 Volume 54 Issue 10 Pages 3868-3872
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The nonlinear conductivity has been measured in pulsed field up to ≈20 V/cm at temperatures 60∼370 K for samples with various impurity concentrations, 2.0×1014∼6.0×1016 cm−3. The warm electron coefficient is almost independent of the impurity concentration above 190 K, and nearly constant, ≈+2.9×10−5 cm2/V2, above 260 K. With decreasing temperature, (a) it decreases and crosses zero at 190 K, (b) it decreases further toward negative and reaches a minimum, and (c) it turns again to positive. In the regions (b) and (c), the coefficient depends on the impurity concentration. The dominant scattering centers in (a), (b) and (c) are found to be the holes, the phonons and the ionized impurities, respectively.
    Download PDF (612K)
  • Hiroyuki Taki, Katsuki Oshiden, Eiji Ohta, Makoto Sakata, Shoji Yamada ...
    1985 Volume 54 Issue 10 Pages 3873-3879
    Published: October 15, 1985
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Longitudinal magnetophonon resonance in epitaxially grown n-type InP was studied in Ohmic and hot electron conditions using pulsed high magnetic fields up to 30 T. In the temperature range between 140 and 240 K, it was found that in the Ohmic region the longitudinal magnetophonon peaks with integer harmonic numbers showed a considerable phase shift whereas those with half-integer harmonic numbers are in good agreement with the theoretically predicted positions. In hot electron conditions at low temperatures 10–40 K, new structure was observed in high magnetic field range.
    Download PDF (868K)
  • Shinji Kawaji, Hiroyuki Shigeno, Junji Yoshino, Hiroyuki Sakaki
    1985 Volume 54 Issue 10 Pages 3880-3884
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    An anomalous magnetoresistance in perpendicular magnetic fields B is found in 2DEG of GaAs/AlxGa1−xAs interfaces in the fields up to 0.015 T and at temperatures between 4.2 K and 1.1 K. The magnetoresistance consists of a negative part proportional to B2 and a positive part which saturates at high fields.
    Download PDF (620K)
  • Junichi Wakabayashi, Shoichi Kimura, Shinji Kawaji
    1985 Volume 54 Issue 10 Pages 3885-3888
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Surface electron density dependence of the valley splitting energy ΔEv in an n-channel (100) silicon MOSFET has been obtained by finding the electron density region in which the relation ΔEv=ΔEs⁄2 and ΔEv=3ΔEs⁄2 occurs, where ΔEs is the spin splitting energy. The lower bound and the upper bound for this electron density region have been determined by the observation of a spin split minimum and a spin split maximum, respectively. The results are compared with the existing theories.
    Download PDF (492K)
  • Takamitsu Kobayashi, P. K. Ashwini Kumar, Kiyomi Okamoto, Mieko Ohtsuk ...
    1985 Volume 54 Issue 10 Pages 3889-3894
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The effect of the lithium fluoride (LiF) precoating on the fluctuation-induced conductivity (FIC) of superconducting indium and vanadium films was investigated. Several kinds of samples were used. The measured FIC is well explained by the traditional superconducting fluctuation theory with two fitting parameters, the transition temperature Tc and the pair breaking parameter δ. The experimental relation δ=a+bRnsq holds for each type of sample, where Rnsq is the normal state sheet resistance. The coefficient b for the unprecoated samples is much smaller than that for the LiF precoated samples in contrast to the lead case. The coefficient b is not so much influenced by the LiF overcoating.
    Download PDF (804K)
  • Nobuyuki Momozawa, Yasuo Yamaguchi, Humihiko Takei, Masaru Mita
    1985 Volume 54 Issue 10 Pages 3895-3903
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Magnetization measurements and neutron diffraction experiments were carried out on (Ba1−xSrx)2Zn2Fe12O22 in a field applied parallel to the c-plane. Spins in the (T1⁄2ST1⁄2) block are observed to be bunched in the form of ferrimagnet. Five magnetic phases appear with increasing field: helix with a small ferromagnetic component, intermediate (1) having a period of four (T1⁄2ST1⁄2) blocks, intermediate (2) and (3) having a period of two (T1⁄2ST1⁄2) blocks and ferromagnetic. A crossing angle between the adjacent (T1⁄2ST1⁄2) spin blocks is almost equal to the turn angle of the helix in the first three phases, rapidly decreases in intermediate (3) phase and becomes zero in ferromagnetic phase.
    Download PDF (1100K)
  • Yasunari Kurihara
    1985 Volume 54 Issue 10 Pages 3904-3908
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    We have investigated the long-range Coulomb effects to coupled modes of the phase oscillation of the incommensurate spin density wave and the charge density fluctuations at zero temperature for situations A and B where band electrons completely lose the itinerant character with appearance of the single excitation gap in A and they still retain this character in B. For A there exists the only one coupled mode at zero momentum for finite frequencies region. This mode has a pole at the plasma frequency just as the Bogoliubov-Anderson mode has in the superconductor. For B there is a possibility of a linear spectrum existing with the velocity of order of the Fermi velocity under certain conditions in contrast with A lacking in this linear spectrum. The longitudinal susceptibility is expressed in terms of the amplitude and phase oscillations of the spin density wave.
    Download PDF (640K)
  • Fusayoshi J. Ohkawa
    1985 Volume 54 Issue 10 Pages 3909-3914
    Published: October 15, 1985
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    It is definite from recent theoretical and experimental works that a quartet Γ8 is the ground multiplet of f levels in CeB6. Because the degeneracy of the quartet is composed of the orbital degeneracy as well as the Kramers degeneracy, its degree of freedom can be expressed by two kinds of Pauli matrices, which are called orbital spins and magnetic spins, respectively. It is proposed that the low temperature phase II is an antiferromagnetic state of orbital spins caused by the exchange interaction. Our model can explain various mysterious experimental results of phase II such as the increase of the transition temperature with increasing magnetic fields and the appearance of antiferromagnetic moments in the presence of fields, which vanish in the absence of fields. Therefore it can be concluded that the ordering in phase II of CeB6 is the first example of the orbital ordering realized by the exchange interaction.
    Download PDF (748K)
  • Yizhe Shen, Ikuo Nakai, Hiroshi Maruyama, Osamu Yamada
    1985 Volume 54 Issue 10 Pages 3915-3919
    Published: October 15, 1985
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    The magnetic isotherms in the vicinity of the Curie temperature Tc have been measured for single crystals of ordered and disordered Fe–Pt Invar alloys under external magnetic fields up to 52.7 kOe. The relative accuracy of the magnetization is better than 1×10−4. The critical exponents β, γ and δ were obtained from the static scaling hypothesis. There is a considerable difference in them between the ordered and the disordered alloys.
    Download PDF (492K)
  • Takahito Terashima, Yoshichika Bando
    1985 Volume 54 Issue 10 Pages 3920-3924
    Published: October 15, 1985
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    Ultrathin Fe3O4 films were prepared by reduction of multilayered α-Fe2O3–SiO films. The ultrathin Fe3O4 was antiferromagnetic at low temperatures, although it had a small spontaneous magnetization of 3 emu/g. The magnetization temperature curve shows a maximum at 65 K, which may corresponds to the blocking temperature of a superparamagnetism. The superparamagnetic behavior was also observed in the Mössbauer spectra. The Mössbauer spectrum at room temperature shows a paramagnetic state and is analyzed to consist of the three kinds of doublets due to Fe3+ in A site, Fe2.5+ in B site and Fe2+ in B site.
    Download PDF (544K)
  • Shoji Ishida, Setsuro Asano, Junji Ishida
    1985 Volume 54 Issue 10 Pages 3925-3933
    Published: October 15, 1985
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    The electronic structures were calculated by the KKR and the local-spin-density methods for ZrMn2, TiFe2 and NbFe2. The densites-of-states (DOS’s) of the C14 Laves phase compounds AB2 are characterized by the DOS’s of the atoms B(2a) and B(6h) around the Fermi level which play an important role in investigating their magnetism. We can guess from the structures of the DOS’s and the number of valence electrons whether or not a compound is magnetic.
    Download PDF (860K)
  • Shûji Sudo, Tomonao Miyadai
    1985 Volume 54 Issue 10 Pages 3934-3941
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Magnetic and neutron diffraction measurements were made on sintered samples with x=0–0.55. We investigated the relation between weak ferromagnetism and two types of antiferromagnetism (the first kind=M1, the second kind=M2, of f.c.c.). It was found that M1 and M2 orderings coexist whenever weak ferromagnetism appears. The critical concentrations for weak ferromagnetism and M2 ordering were found to coincide with each other, and it was determined to be 0.3. This value is considerably smaller than that at the insulator-metal phase boundary (0.5). Weak ferromagnetism and M2 ordering were found only in the insulator phase, not in the metallic phase. Some discussion is given on the composition dependence of weak ferromagnetic moment.
    Download PDF (1092K)
  • Hideyuki Kato, Tadashi Tomikawa, Kiichi Amaya, Nobuo Wada
    1985 Volume 54 Issue 10 Pages 3942-3945
    Published: October 15, 1985
    Released on J-STAGE: May 29, 2007
    JOURNAL RESTRICTED ACCESS
    In the triangular XY-like antiferromagnet RbFeCl3, the metastable state of the lowest ordered phase in zero magnetic field has been studied by measuring the magnetization. A remanent magnetization of the order of 10−3 μB per one magnetic ion was observed in zero field after the magnetic field had been applied in the easy plane, and it decreased logarithmically in time. The anisotropy field of the magnetization was estimated to be about 40 Oe. The magnetization may be induced by the spins composing magnetic domain walls.
    Download PDF (456K)
  • Michio Naito, Hironori Nishihara, Shoji Tanaka
    1985 Volume 54 Issue 10 Pages 3946-3955
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The first systematic study of nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) of the 181Ta nuclei has been made on 1T-TaSe2 at 4.2 K in order to get detailed information on the superlattice structure in the commensurate charge density wave state of this material from a microscopic viewpoint. The NMR and NQR spectrum show seven fairly sharp resonance lines, six of which are strong and one is weak. The results are discussed on the basis of the star-shaped cluster model with an emphasis on the fine structures due to the three-dimensional ordering of clusters.
    Download PDF (1096K)
  • Shin-ichi Kuroda, Hiroshi Bando, Hideki Shirakawa
    1985 Volume 54 Issue 10 Pages 3956-3965
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Electron nuclear double resonance (ENDOR) measurements were performed on stretch oriented undoped cis-rich (CH)x at 4 K. The observed ENDOR line shape had spectral turning points and showed a clear anisotropy. The presence of the spin density which is comparable with the prediction of the soliton theory was directly confirmed from the maximum ENDOR frequency. The analysis of the observed line shape using a spectrum simulation method suggested that the spin density is of the form similar as those predicted by the soliton theory for finite on-site Coulomb energy. Especially the spectral turning points observed when the external magnetic field was parallel to the stretch direction of the sample were directly correlated to the existence of the negative spin density predicted by the theory.
    Download PDF (1420K)
  • Masahiro Matsumura, Hideki Yamagata, Susumu Chikazawa, Yoshihito Miyak ...
    1985 Volume 54 Issue 10 Pages 3966-3977
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    The spin echo decay of 59Co associated with nonmagnetic Co atom in CoGa compounds was measured at 9, 5 and 2.5 MHz in wide temperature range through the spin glass transition temperature, Tg. At T>>Tg, nuclear spin-lattice relaxation time, T1, was also measured. Analyzing the spin echo decay and T1, we have deduced the average nuclear spin-lattice relaxation rate, ⟨T1L−1⟩, to the system of localized moments, which shows a progressive peak like the case of the critical slowing down near Tg. The temperature at the peak is somewhat lower than Tg measured by magnetic susceptibility in zero field. ⟨T1L−1⟩ increases rapidly with decreasing the resonance field near the temperature at the peak. Following Chen and Slichter, the electron spin correlation time, τm was estimated from ⟨T1L−1⟩ and the integrated intensity. τm shows a slowing down of orders three at the transition.
    Download PDF (1464K)
  • Hideki Watanabe, Yûichi Tazuke, Haruo Nakajima
    1985 Volume 54 Issue 10 Pages 3978-3986
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Measurements of electron spin resonance and magnetization have been performed on the cubic B-20 FexCo1−xSi (0.3≤x≤0.85). The magnetization process on Fe0.8Co0.2Si indicates that this sample is a helimagnet with the cone-ferro-magnetic transition under a low magnetic field. In this sample, the helical spin resonance and the critical field resonance have been observed at 9 GHz at low temperatures, and are similar to those in MnSi observed by Date et al. The helical spin resonance data of Fe0.8Co0.2Si and MnSi are reasonably explained by the recent magnetic resonance theory for the helical spin structure due to the anti-symmetric exchange interaction existing in the cubic B-20 structure because of the lack of inversion symmetry. In every sample of FexCo1−xSi, ferro- and para-magnetic resonances have been observed at 9 and 24 GHz, and are briefly discussed.
    Download PDF (1112K)
  • Mitsuo Wada, Naotaka Nakamura, Shinichi Yano, Yoshihiro Ishibashi
    1985 Volume 54 Issue 10 Pages 3987-3989
    Published: October 15, 1985
    Released on J-STAGE: June 01, 2007
    JOURNAL RESTRICTED ACCESS
    Temperature dependent low-lying modes and Rayleigh wing associated with the incommensurate phase transitions in CTFP have been measured by Raman scattering technique. In the spectra of the totally symmetric representation three low-lying modes around 20 cm−1 show anomalous temperature dependence. In each phase transition no typical soft mode has been observed.
    Download PDF (308K)
feedback
Top