Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
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Volume 57, Issue 10
Displaying 1-50 of 51 articles from this issue
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  • Rotationally Resolved Photoelectron Asymmetry Parameter of H2 Using Ne–I 736Å Radiation
    Satoshi Takahashi, Seiji Ogata, Shunsuke Hara, Masatoshi Nakamura
    1988 Volume 57 Issue 10 Pages 3273-3276
    Published: October 15, 1988
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3273
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    The photoelectron angular distribution of H2 is measured using Ne–I 736A radiation. The asymmetry parameter β02 for the (0–2) rotational transition in the (0–0) vibrational band is obtained using the regularity of the rotational transition and a deconvolution technique. The value of β02 obtained is 0.66 (±0.17). This is in good agreement with the experimental data of Ruf et al. and with the theoretical calculation in which both the effect of electron exchange and the f-wave contribution of the ejected photoelectron are taken into account.
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  • Performance of Radial Focus Applied-B Ion Diode on a Coaxial Pulse Power Machine
    Shuji Miyamoto, Seiichi Sawada, Katsuji Emura, Noboru Yugami, Tatsuro ...
    1988 Volume 57 Issue 10 Pages 3277-3280
    Published: October 15, 1988
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3277
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    A high-power magnetically insulated ion diode with radial geometry was successfully operated on a Reiden IV–H (2 MV, 200 kA) coaxial pulse power machine with across-current feed converter. The generated proton beams were focused ballistically onto the axis. Data of the beam trajectory measurements showed a large aberration of beam focusing in the diode gap region. This may be due to the electron virtual cathode distortion. The reduction of beam focusability was improved simply by correcting the shape of the anode surface. The focused beam intensity of 3×1010 W/ cm2, which was measured by an ion pinhole camera, was compared with predicted values from the trajectory measurements and the beam brightness. Focus reduction factors in the diode were improved from 0.15 to 0.41.
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  • Observation of a Flute Mode Excited in the Center Cell of the GAMMA 10 Tandem Mirror by Using Far-Infrared Laser Scattering
    Teruo Saito, Minoru Fujita, Atsushi Mase, Masaaki Inutake, Kameo Ishii ...
    1988 Volume 57 Issue 10 Pages 3281-3284
    Published: October 15, 1988
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3281
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    A flutelike coherent density fluctuation with a frequency near the E×B rotation frequency is observed in the center cell of the GAMMA 10 tandem mirror. It is excited when the ambipolar potential of a plasma is raised owing to electron cyclotron resonance heating. Far-infrared laser scattering is employed and the radial distribution of the fluctuation is obtained. It has a rather broad profile and azimuthal modenumber m=1. The observed characteristics of the mode are consistent with the rotational flute mode.
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  • Fractal-to-Compact Transition and Velocity Selection in Aggregation from Lattice Gas
    Makio Uwaha, Yukio Saito
    1988 Volume 57 Issue 10 Pages 3285-3288
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3285
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    Velocity selection has been studied for aggregate growth from a lattice gas, which interpolates between the diffusion-limited aggregation (DLA) and the Eden model. At a low gas density ng, the aggregate is fractal and similar to the DLA up to a length ξ, beyond which it becomes compact and uniform. The growth rate V is expected to follow as V∼ξ−1∼ng1⁄(d−Df), where Df=1.71, being the fractal dimension of the DLA. The above theoretical hypothesis is confirmed by Monte Carlo simulations.
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  • Tc Enhancement Observed in Si, Ge and GaP under Low-Temperature Pressurizing
    Haruki Kawamura, Kyoji Tachikawa
    1988 Volume 57 Issue 10 Pages 3289-3292
    Published: October 15, 1988
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3289
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    Pressure-induced superconductivities in Si, Ge and GaP were measured along two different paths on the P-T diagram. The superconducting transition temperatures, Tc’s, were enhanced when pressure was continuously increased from 1 bar at liquid helium temperature. The Tc of GaP is greatly enhanced from 3.9 to 10.4 K by low-temperature pressurizing.
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  • High Field Magnetism of CuO
    Osamu Kondo, Mitsuru Ono, Emiko Sugiura, Kiyohiro Sugiyama, Muneyuki D ...
    1988 Volume 57 Issue 10 Pages 3293-3296
    Published: October 15, 1988
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3293
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    High field magnetization of CuO powder is measured in pulsed magnetic fields up to 360 kOe. The spin-flop field Hc and the perpendicular magnetic susceptibility χ⊥ are found to be 104 kOe and 2.7×10−6 emu/g at 4.2 K, respectively. The exchange field HE of 6000±600 kOe and the anisotropy field HA of 0.9±0.1 kOe are estimated. CuO can substantially be regarded as a one-dimensional magnet with an intrachain exchange interaction J0⁄k of 400K and frustration effects are expected between the chains.
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  • Oxygen Content Dependence of Nuclear Resonance Spectrum in Tetragonal YBa2Cu3Ox
    Masahiro Matsumura, Hideki Yamagata, Yoshihiro Yamada, Kenji Ishida, Y ...
    1988 Volume 57 Issue 10 Pages 3297-3300
    Published: October 15, 1988
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3297
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    The dependence of the resonance profiles for 63Cu and 65Cu on the oxygen content, x, in YBa2Cu3Ox (6.1≤x≤6.4) was investigated systematically. The measurements were performed for two different sites, the Cu–O2 plane site (Cu(2)) and the Cu–O chain site (Cu(1)), at the liq. He temperature. The NQR spectrum corresponding to the Cu(1) sites consists of three different spectra. Their relative intensities change systematically with increasing x. Some discussions are made on the oxygen coordination, the spectral shift and the line broadening. The quadrupolar-split NMR spectra associated with the Cu(2) sites were obtained in x≤6.3. Although the magnetic line broadening becomes significant, no spectral shift was observed with the increase of x. This means that the magnetic moment on the Cu(2) site in the antiferromagnetic state does not change, at least until x=6.3.
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  • Low-Temperature Electron Spin Susceptibility in YBa2Cu3O7−x
    Kazushi Kanoda, Toshihiro Takahashi, Takeshi Kawagoe, Tadashi Mizoguch ...
    1988 Volume 57 Issue 10 Pages 3301-3304
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3301
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    EPR studies were performed in order to clarify the oxygern-deficiency dependent magnetism in YBa2Cu3O7−x. A giant EPR signal emerges at low temperatures in this compound. This is not due to impurity phases, but is indicative of the presence of electrons free from superconducting condensation. With decreasing temperature, the spin susceptibility increases more rapidly than a Curie law and the magnitude correlates with the oxygen deficiency. We consider that our results are related to disorder-induced electron localizations associated with the randomness caused by oxygen nonstoichiometry. This idea is discussed along with recent μSR, NMR, and specific heat results.
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  • Existence of Low-Dimensional Chaos in Paramecium Membrane Potential Suggested by the Correlation Integral Method
    Yoshinori Nagai, Ritsuo Hara, Takashi Tsuchiya, Nobuhiko Saitô
    1988 Volume 57 Issue 10 Pages 3305-3308
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3305
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    The Grassberger-Procaccia method for calculating the correlation dimension of apparently stochastic data is used to analyze the data of membrane potentials of paramecium. The existence of low-dimensional (D2=1.08±0.03) chaos is suggested.
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  • Exact Cylindrical Soliton Solutions of the Sine-Gordon Equation, the Sinh-Gordon Equation and the Periodic Toda Equation
    Akira Nakamura
    1988 Volume 57 Issue 10 Pages 3309-3322
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3309
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    We consider the sine-Gordon equation, the sinh-Gordon equation and the periodic Toda equation which are written respectively as Δu+sinu=0, Δu+sinhu=0 and Δun−exp (−un+un−1)+exp (−un+1+un)=0, (un=un+N′), where Δ≡∂2⁄∂x2+∂2⁄∂y2. The exact analytic solutions of the above equations corresponding to the cylindrical solitons have been obtained. The solutions are expressed by the series expansions of the Bessel functions.
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  • Statistical-Mechanical Theory of One-Dimensional Gases with Short-Range and Long-Range Intermolecular Forces. IV. Phase Transitions at Finite Temperatures in the Case of Attractive Short-Range Interaction
    Sizuka Kurioka, Kazuyosi Ikeda
    1988 Volume 57 Issue 10 Pages 3323-3331
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3323
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    Numerical calculations of the equation of state are made for the one-dimensional gas model proposed and discussed by Ikeda in papers I and II; the model consists of molecules with hard cores, short-range (square-potential) attractions and infinitely-long-range attractions (given by the potential −2a⁄L, a=positive constant, L=length of the gas). For this model it is exactly shown that one transition occurs below the critical temperature Tc and no transition occurs above Tc, just as in a van der Waals gas, but the critical temperature and tlne critical pressure are higher than those of a van der Waals gas, by virtue of the existence of the short-range attraction.
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  • Reformulation of Thermomolecular Pressure Effect toward Thermal Diffusion
    Naokata Takeyama, Kimie Nakashima
    1988 Volume 57 Issue 10 Pages 3332-3338
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3332
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    In many standard monographs of nonequilibrium thermodynamics, there are inconsistent parts of confusion in terminology as well as in notation, especially in the area of thermal diffusion, between quantities of transport and transported. Such a situation is corrected at an elementary level. As a result, the chemical potential of a diffusing species should be the “transported” Gibbs energy per mole. Based on this notion, the assumption of local equilibrium and the Gibbs equation can effectively and consistently be applied. Referring to a binary mixture, individual quantities of transport are discussed in harmony with “absolute” quantities introduced by de Groot and Mazur, in connection with the relative quantities of transport in common use.
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  • On the Phenomenological Description of KS and KL Mesons in the S-Matrix Formalism
    Yoshio Yamaguchi
    1988 Volume 57 Issue 10 Pages 3339-3343
    Published: October 15, 1988
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3339
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    A new description of the CP-mixing K1−K2 states is given based on the S-matrix approach, whereby two states |KS⟩ and |KL⟩ can properly be orthogonal, ⟨KS|KL⟩=0.
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  • The Parity-Violating Asymmetry of Helicity Cross Sections of Very Low Energy Neutron-Nucleus Collisions
    Yoshio Yamaguchi
    1988 Volume 57 Issue 10 Pages 3344-3351
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3344
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    The parity-violating asymmetries of helicity cross sections of low energy (En≤10 eV) neutrons on nuclei with spin 0 and 1/2 are described. Possible Cp-violation tests of these scatterings are discussed. Finally, a few remarks are given on CP-violation.
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  • Measurements of Beam-Foil Spectra of Highly Ionized Chlorine Ions in the Region of 170–260 Å
    Masao Sataka, Kunio Ozawa, Kiyoshi Kawatsura, Akio Ootuka, Ken-ichiro ...
    1988 Volume 57 Issue 10 Pages 3352-3356
    Published: October 15, 1988
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3352
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    A Beam-foil study was made on highly ionized chlorine ions. Emission lines in the wavelength region from 170 Å to 260 Å were observed and most of the lines were due to the 2s-2p transitions belonging to Cl XII–Cl XIV. Two lines at ∼180 Å and ∼206 Å are newly identified as transitions between high nl levels of Cl XV and Cl XIV. The lifetimes of 2s2p 1P1 and 2p2 1D2 levels in Cl XIV were determined from the intensity decay curve of 237.7 Å obtained with time-of-flight technique to be 0.14 nsec and 0.60 nsec, respectively.
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  • Spatial Instabilities and Onset of Chaos in Rayleigh-Benard System with Intermediate Aspect-Ratio
    Satoru Nasuno, Masaki Sano, Yasuji Sawada
    1988 Volume 57 Issue 10 Pages 3357-3364
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3357
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    We present experimental studies of structural instabilities of convective rolls and the onset of chaos of a Rayleigh-Benard convection system of water in a rectangular container with an intermediate aspect-ratio. Dynamical process of wavenumber reduction was observed by flow-visualization. It was found that the structural instability occurs along an instability boundary which is close to the ones calculated for an infinite aspect-ratio system. A very slow oscillation ∼0.9 mHz was found to set in first at R=13.4Rc in the region where knot and cross-roll instability lines for an infinite system meet each other. Subsequently, ordinary Hopf modes appeared at R=16.5Rc and 17.6Rc and then the system was found chaotic. A possible origin of the slow oscillation in terms of the competition between the roll states of slightly different wavenumbers was discussed.
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  • N-Solitons on a Curved Vortex Filament with Axial Flow
    Takeshi Miyazaki, Yasuhide Fukumoto
    1988 Volume 57 Issue 10 Pages 3365-3370
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3365
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    The long bending motion of a thin vortex filament with axial flow inside the core is investigated theoretically. The fluid outside the vortex core is assumed to be incompressible, inviscid and irrotational. A new integrable nonlinear equation, valid under the assumption of local induction, is proposed. This equation is shown to be equivalent to the Hirota equation and the N-soliton solution is given explicitly, using the Hirota’s method of bilinear form.
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  • Stochastic Solution Method of the Model Kinetic Equation for Diatomic Gas
    Kenichi Nanbu, Saburo Igarashi, Yasuo Watanabe
    1988 Volume 57 Issue 10 Pages 3371-3375
    Published: October 15, 1988
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3371
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    Holway’s model equation for diatomic gas is transformed into a stochastic process. The solution of the equation can be obtained by realizing the stochastic process. As an example, the method is applied to the computation of the structure of shock wave.
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  • A Generalized Diffusion-Limited Aggregation Where Aggregate Sites Have a Finite Radical Time
    Sasuke Miyazima, Yutaka Hasegawa, Armin Bunde, H. Eugene Stanley
    1988 Volume 57 Issue 10 Pages 3376-3380
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3376
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    In this paper, we study a new class of diffusion-limited aggregation, where each aggregate particle adheres to the aggregate and continues to be radical for a finite time τ. When τ=1 and τ=∞, the present model is reduced to a diffusion-limited self-avoiding walk (DLSAW) and to the original (Witten-Sander) diffusion-limited aggregation, respectively. For a finite radical time, the growth crosses over from DLA growth to DLSAW growth. The crossover time increases with increasing τ. To describe this behavior, we developed a simple scaling theory.
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  • Calorimetric Study of Critical Phenomena in the Diluted Random Ferromagnet, EuxSr1−xS
    Tetsuzi Haeiwa, Eiji Kita, Kiiti Siratori, Kay Kohn, Akira Tasaki
    1988 Volume 57 Issue 10 Pages 3381-3390
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3381
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    The critical phenomena of a randomly diluted ferromagnet EuxSr1−xS (1.0≥x>0.8) are studied through the measurement of specific heat. The transition temperature observed in EuS becomes low and the peak in the specific heat is lowered and rounded systematically with decreasing x. Except for a narrow temperature region containing Tc and a range far apart from it, the specific heat can be expressed by Cp=(A⁄α)|t|−α+B+Et for T>Tc and by the same equaticcn with A′ for T<Tc, where t is (T−Tc)⁄Tc. The inner boundary of the scaling region, where the above expression is valid, moves farther apart from Tc with decreasing x, corresponding to the rounding of the peak. The relation α=α′, predicted by the scaling law, is confirmed. The critical exponent α and ratio of the amplitude A⁄A′ are determined for each con-centration. α is negative and its absolute value increases with decreasing x, reflecting the lowering of the peak at Tc. This is consistent with the results of magnetic measurements (J. Phys. Soc. Jpn. 51 (1982) 2746) as well as those of high-temperature expansion calculation by Kawasaki (private communication), though only qualitatively.
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  • Fluctuation of Transmission Coefficient of Light in the One-Dimensional Random Media
    Jun-ichi Igarashi
    1988 Volume 57 Issue 10 Pages 3391-3402
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3391
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    Statistical fluctuation in the transmission of light is numerically studied in the one-dimensional media with random components in dielectric tensors. The distribution of eigenvalues concerning the logarithm of the product of the transfer matrix and its conjugate transpose is studied in connection to the random-matrix theory. The repulsion of the eigenvalues is found to suppress strongly the fluctuation when birefringence and optical activity are introduced into the system. The interference effects analogous to the Aharonov-Bohm effects are also considered on an interferometer using Berry’s phase. The transmission coefficient periodic in Berry’s phase is studied on the statistical distribution of the Fourier coefficients.
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  • Atomic and Electronic Structure of Ultrathin Iron Film on MgO(001) Surface
    Toshio Urano, Toru Kanaji
    1988 Volume 57 Issue 10 Pages 3403-3410
    Published: October 15, 1988
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3403
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    Iron film deposited on a MgO(001) surface grows layer by layer and forms an epitaxial film at room temperature. Low-energy electron diffraction (LEED) I–V curves are measured for films of various thicknesses. In comparison with the curves by theoretical analysis it is found that an iron film grows pseudomorphic and iron atoms sit just above oxygen ions at the stage of one monolayer (1 ML) average thickness. The structure of an iron film is body-centered tetragonal (bct) in the early stage, but it begins to change to bcc structure at about 10 Å average thickness and at the same time a widening of the valence-band electronic state is observed by Auger electron spectroscopy (AES).
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  • Electronic Band Structure and Structural Transformation from NiAs-Type to MnP-Type of CoAs and NiAs
    Masato Morifuji, Kazuko Motizuki
    1988 Volume 57 Issue 10 Pages 3411-3423
    Published: October 15, 1988
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3411
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    Electronic band structures of CoAs and NiAs are calculated for the non-magnetic state by using a self-consistent augmented-plane-wave method. The energy dispersions, densities of states, and Fermi surfaces are shown. Structural transformations of these compounds from the NiAs-type to the MnP-type are studied on the basis of the electronic bands, by calculating electron-lattice matrix elements and generalized electronic susceptibilities. It is clarified that why the structural transformation from the NiAs-type to the MnP-type occurs in CoAs but not in NiAs.
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  • Impurity Pinning and Microwave Conductivity of Incommensurate Spin Density Waves
    Yoshinori Nakane, Hiroshi Miyazawa, Satoshi Takada
    1988 Volume 57 Issue 10 Pages 3424-3444
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3424
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    We calculate the microwave conductivity due to the phase mode in an incommensurate SDW taking into account nonmagnetic impurity effects and long-range Coulomb interaction between the phason and quasi-particles. It is shown that the conductivity is represented in a scaled form by a pinning frequency. The pinning frequency of SDW is shown to be comparable to that of CDW because the dynamics of phason through the phason self-energy gives important contributions on the pinning frequency and the small parameter μ−1⁄2 which exists in the CDW systems remarkably suppresses the pinning frequency of CDW. The long-range Coulomb effect on the conductivity is seen as the deviation of the frequency dependence of the conductivity from ω2 to ωα with 1⁄2<α<3⁄2 at low frequencies.
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  • Implications of Band-Structure Calculations for High-Tc Related Oxides
    Key Taeck Park, Kiyoyuki Terakura, Tamio Oguchi, Akira Yanase, Minoru ...
    1988 Volume 57 Issue 10 Pages 3445-3456
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3445
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    We have performed band calculatons for the high-Tc related oxides, La2CuO4, YBa2Cu3Oy (y=6 or 7), La2CaCu2O6, CuO, and also NiO with the full-potential linear augmented plane wave method in order to derive information about the characteristic aspects of these materials. We pay particular attention to the energy separation between the oxygen p and the copper d levels, the assignment of a p orbital for the extra hole accommodation, the significance of the p-p hopping, the occupancy in the two-dimensional Cu–O bands, and the Cu valency.
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  • Quantized Conductance of Metallic Narrow Channels in Ballistic Regime
    Yoshimasa Isawa
    1988 Volume 57 Issue 10 Pages 3457-3462
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3457
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    We make a theoretical study of ballistic transport phenomena in metallic narrow channels smaller than the mean free path of the electrons. We find that the quantized conductance, which changes in steps of e2⁄πh as a function of the channel width, is a property of freely propagating electron waves in a narrow channel connected to much wider leads. It is also shown that the channel conductance is also quantized as a function of the magnetic field, and the quantized steps are smeared out at high temperatures or at high channel conductance.
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  • Static and Dynamic Properties of Charge-Density-Waves Described by the Fukuyama-Lee-Rice Model. III. Numerical Study on the dc Nonlinear Conduction
    Hiroshi Matsukawa
    1988 Volume 57 Issue 10 Pages 3463-3473
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3463
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    The dc nonlinear conduction associated with 1, 2 and 3D sliding CDW’s is investigated numerically based on the Fukuyama-Lee-Rice (FLR) model. It is shown that the FLR model for 3D CDW reproduces experimental results of dc nonlinear conductivity of NbSe3 quantitatively, if the parameters in the model are properly chosen. The obtained results are discussed by the comparison with those of the perturbational analysis with respect to the impurity pinning strength on the same model. Nature of the pinned states and dynamical critical phenomena near the threshold field are also discussed.
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  • Effects of Oxidization on the Low Temperature Electrical Properties of Magnetite (Fe3−δO4: δ=0∼0.01)
    Masakazu Kobayashi, Yukikuni Akishige, Etsuro Sawaguchi
    1988 Volume 57 Issue 10 Pages 3474-3483
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3474
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    Effects of a small deviation δ (Fe3−δO4) from the stoichiometric Fe3O4 on the dielectric and conducting properties have been investigated below 80 K. The δ was controlled by annealing {100} thin plates at 1300°C in CO–CO2–Ar mixing gas. The dielectric constant shows pronounced relaxational anomalies at about 10 K and 40 K, and the dielectric behavior is very much dependent on δ. The ac conductivity σac shows a frequency dispersion, σac∝ωs (s<1), suggesting that an impurity conduction mechanism predominates in low temperatures (T<60 K). The electrical properties are discussed by considering electric dipoles formed by ionized defects.
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  • Sublimation of Cleaved Surface of Zinc Single Crystals. II. Interpretation and Discussion
    Tasaburô Yamaguti
    1988 Volume 57 Issue 10 Pages 3484-3490
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3484
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    Cleaved surfaces of zinc single crystals were sublimed. The fact that the sublimed layer thickness of 29 μm evaluated from the observed deposited thickness 0.3 μm of the film is almost equal to the depth of 22 μm of the recess engraved on the cleaved surface indicates the possibility of particle ejection. The sublimed mass 1.9 g evaluated from the Hertz-Knudsen formula with the evaporation coefficient α=1 is larger than the initial specimen mass of 0.57 g. The thickness, 34 μm, of the deposited film, estimated from the Hertz-Knudsen formula with α=1, is larger than the observed thickness of 0.3 μm. Scanning electron micrographs and evaluation of the sublimed mass and the film thickness indicate the inapplicability of the atomic evaporation theory.
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  • A Cooper Pairing Mechanism Mediated by the Virtual Exchange of the RVB Quanta
    Yoshihiro Asai
    1988 Volume 57 Issue 10 Pages 3491-3498
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3491
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    A theory for the superconducting mechanism of the high-Tc copper oxide superconductors is proposed. It is presumed that the holes occupying the nonbonding oxygen 2p band interact with the RVB state of the dx2−y2 network through the s-d like interaction at each site. This gives the unusual spin singlet s-wave and d-wave pairings whose sign of interaction is not “+” but “−”, and the usual spin triplet p-wave pairing. The gap equations have been solved to obtain the critical temperature responsible for the high-Tc copper oxide superconductors. The possible RVB mediated p-wave pairing mechanism is suggested for the copper oxide superconductors.
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  • Resistivity of High Temperature Superconductors in Magnetic Field
    Toshihiko Tsuneto
    1988 Volume 57 Issue 10 Pages 3499-3505
    Published: October 15, 1988
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3499
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    Temperature dependence of resistivity observed in high temperature superconductors such as YBCO under a magnetic field is shown to be in marked disagreement with the standard theory of fluctuation enhanced conductivity. By estimating relevant energies, we suggest that vortex pairs or rings can be important fluctuations in these superconductors and lead to melting of the flux lattice near Hc2. A mechanism due to phase slippage at grain boundaries is also discussed.
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  • Quantum Monte Carlo Study of the Quasi-One-Dimensional Many Bipolaron System
    Shu-ichi Nagasawa, Kazuo Hida
    1988 Volume 57 Issue 10 Pages 3506-3513
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3506
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    The low temperature behavior of the quasi-one-dimensional many bipolaron system is investigated by the quantum Monte Carlo simulation treating the interchain coupling by the mean field approximation. In the non-half-filled case, it is found that the superconductivity can coexist with the CDW. The coexisting CDW can have either the wave length twice the lattice constant or half the fermi wave length. The former appears only in the coexistence region with the superconductivity, while the latter either appears alone or coexists with the superconductivity.
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  • Dynamic Scaling Relation in Reentrant Spin Glass Pd1−x−yFexMny
    Hideaki Takano, Yoshihito Miyako, Margarida Godinho, Jean Louis Tholen ...
    1988 Volume 57 Issue 10 Pages 3514-3519
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3514
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    Ac-susceptibilities are measured for reentrant spin glasses Pd0.920Fe0.015Mn0.065 and Pd0.905Fe0.015Mn0.080 at the frequency from 4.1 Hz to 41.1 kHz. The frequency dependence of TGT(ω), temperature of the maximum in the imaginary part of ac-susceptibility, is analyzed using a standard dynamic scaling, as a power law in nonlinear reduced temperature ε=[TGT(ω)−TGT(ω=0)]⁄TGT(ω). The result suggests that the reentrant spin glass freezing (Gabay-Toulouse transition) in Pd0.920Fe0.015Mn0.065 is a thermodynamical phase transition.
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  • Spin-Glass Transition in a Magnetic Field for Canonical Spin Glasses AuFe and AgMn and the Critical Phenomena
    Toshifumi Taniguchi, Yoshihito Miyako
    1988 Volume 57 Issue 10 Pages 3520-3531
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3520
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    A magnetic field vs temperature (H−T) phase diagram is determined from linear χ0⊥ and nonlinear χ2⊥ susceptibilities perpendicular to H for metallic spin glasses AuFe (4 at.%Fe) and AgMn (4 at.%Mn). Two characteristic temperatures T1(H) and T2(H) in the H−T phase diagram are obtained from the measurements of χ0⊥ and χ2⊥. The σ2⊥ signal has a round maximum at T=T1(H) and below T1(H) the imaginary part of χ0⊥ increases rapidly around T=T2(H). The critical exponents β and γ are found to be β=1.0±0.2, γ=2.0±0.2 for AuFe (4at.%Fe) and β=1.0±0.2, γ=1.7±0.2 for AgMn (4 at.%Mn) from the scaling argument. Nonlinear magnetization far above Tg is discussed with the Sherrington-Kirkpatrick (SK) model including an additional atomic short-range effect.
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  • Statics and Dynamics of Antiferromagnetic Ising System on a Triangular Lattice. II
    Kazuko Kawasaki, Tatsuya Uezu
    1988 Volume 57 Issue 10 Pages 3532-3551
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3532
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    The Ising model on a triangular lattice with antiferromagnetic nearest neighbor and ferromagnetic next nearest neighbor interactions is investigated by treating the master equation. To terminate hierarchy structure of the equation of motion, the cluster decoupling approximation (CDA) is applied in a similar way as in the previous paper. But here, we retain not only single cumulants but also second ones. The fluctuation effect in the occurrence of the successive phase transition and “turn round” phenomena in a relaxation process are discussed. The formula of the frequency dependent susceptibility is derived within the present approximation, and the response of the system to the external oscillating field is studied. Finally, the fluctuation-dissipation theorem is derived for this spin system.
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  • Low-Temperature Magnetic Susceptibility and Specific Heats of Single Crystals PrCu6
    Sigeru Takayanagi, Nobuo Wada, Takashi Watanabe, Yoshichika \={O}nuki, ...
    1988 Volume 57 Issue 10 Pages 3552-3556
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3552
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    We have measured the magnetic susceptibility and specific heat of PrCu6 single crystal, and have determined the crystal electric field scheme of Pr3+. The experimental results claim the singlet ground state, contrary to the neutron scattering result. We have also determined the electronic specific heat coefficient to be 15.8 mJ/mol·K2.
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  • Magnetic Properties of the Heavy-Electron Compound YbP
    Akira Oyamada, Shigeru Takagi, Tadao Kasuya, Kiyohiro Sugiyama, Muneyu ...
    1988 Volume 57 Issue 10 Pages 3557-3561
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3557
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    High-field magnetization for the external field of up to 530 kOe at 4.2 K as well as temperature dependence of low-field susceptibility between 2 and 290 K have been measured on the magnetically ordered heavy-electron compound YbP. Except for the susceptibility at the lowest temperatures, the experimental data are found to be described quite well by the analyses in terms of both the single-site effects of the crystalline-electric-field (CEF) and the Kondo coupling of the Γ6 doublet ground state of Yb3+ ion, and the interatomic exchange interaction with an antiferromagnetic coupling between the Γ6 states. It is also shown that the temperature-independent susceptibility at the lowest temperatures is considered as a manifestation of the onset of magnetic correlations from well above the ordering temperature.
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  • Competition between Kondo Effect and RKKY Exchange Interaction in Kondo Lattices
    Tetsuya Yamamoto, Fusayoshi J. Ohkawa
    1988 Volume 57 Issue 10 Pages 3562-3567
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3562
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    The competition between singlet Fermi liquids and magnetic states was theoretically investigated in Kondo lattices. The RKKY exchange interaction was treated in the mean field approximation, while the Kondo effect was taken into account in the next divergent approximation, or in the approximation that terms of the order of 1⁄N2 are included in the 1⁄N-expansion method, N being the degeneracy of localized levels. The theory can explain saturated magnetization of CeNixPt1−x as a function of Ni content, x, by assuming that the Kondo temperature depends linearly on x.
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  • NMR Study of Spin State of Mn2+ Impurity in Antiferromagnet CoCl2·2H2O
    Hidenori Kubo, Tatsuichi Hamasaki, Kazuyoshi Takeda
    1988 Volume 57 Issue 10 Pages 3568-3572
    Published: October 15, 1988
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3568
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    The spin state of the isolated Mn2+ impurity in the antiferromagnetic phase of CoCl2·2H2O is studied by proton NMR. The observed two satellite lines at 1.7 K are revealed to be due to the nearest neighboring protons to Mn2+ impurity having the moment of 5 μB and 3 μB. On the time scale of proton NMR, Mn2+ moments are observed to take not the thermal averaged value but each Sz value because of very long relaxation times of Mn2+ spin.
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  • Evidence of Structural Phase Transition in K2CdF4 Derived from EPR Measurements for Cr3+ Centres
    Masanori Arakawa, Hiroshi Ebisu, Hideo Takeuchi
    1988 Volume 57 Issue 10 Pages 3573-3579
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3573
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    An EPR investigation of Cr3+ in K2CdF4 has been made in a temperature range 295–397 K. The temperature dependence of the spectrum shows that a structural phase transition occurs near 376 K. The field-direction dependence of the uncompensated centre at 301 K indicates that there are four equivalent Cr3+ sites whose principal z axes in the spin Hamiltonian deviate from the [001] axis by an angle close to 9° in the (110) and (1\bar10) planes. The structure in the low temperature phase is interpreted by the condensation of soft phonon modes at X point of the tetragonal Brillouin zone associated with rotation of CdF6 octahedra arccund [110] axes.
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  • Antiferromagnetic Resonance and Spin-Wave Instabilities at Spin-Flop Critical Field in (C2H5NH3)2CuCl4
    Jun Shi, Hitoshi Yamazaki, Michinobu Mino
    1988 Volume 57 Issue 10 Pages 3580-3586
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3580
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    Antiferromagnetic resonance and parametric excitation of spin-waves at spin-flop critical field in (C2H5NH3)2CuCl4 are studied by perpendicular-pumping technique. Nonlinear absorption which is attributed to the first-order Suhl instability is observed at twice the frequency of the spin-flop critical field resonance. Power dependence of the imaginary part of the susceptibility, χ″, shows the existence of the second threshold which indicates unstable growth of second group of magnon modes.
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  • Mössbauer Studies on the Tellurium-Selenium Mixed Chains
    Hiroshi Sakai, Makoto Yao, Masanori Inui, Kenji Maruyama, Kozaburo Tam ...
    1988 Volume 57 Issue 10 Pages 3587-3593
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3587
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    125Te Mössbauer absorption measurements have been carried out for Te–Se mixed chains confined in the one-dimensional channels of mordenite crystals as well as for the mixed chains in trigonal crystalline and amorphous phases. 129I Mössbauer emission spectra have been also taken for 129Te labeled amorphous and trigonal Te–Se mixtures. The quadrupole splitting at the 125Te atom is found to be appreciably larger for the isolated chains than for the trigonal mixtures, suggesting that the anisotropy of Te bonding is increased by reducing the interchain coupling between the adjacent chains. Both 125Te and 129I Mössbauer results indicate that the molecular character is much stronger in the amorphous phase than in the trigonal phase.
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  • Dielectric Dispersion of Ferroelectric CsH2AsO4 in the Paraelectric and the Ferroelectric Phases
    Kohichi Hayashi, Kiyoshi Deguchi, Eiji Nakamura
    1988 Volume 57 Issue 10 Pages 3594-3598
    Published: October 15, 1988
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3594
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    Complex dielectric constant of CsH2AsO4 along the ferroelectric c-axis has been measured in the frequency range from 103 to 109 Hz above and below the Curie temperature Tc. In contradiction to the result reported by Tornberg and Lowndes, there is no dielectric dispersion around 108 Hz above Tc. Below Tc, two dielectric dispersions, resonant type and relaxational type, are found. The relaxation time of the latter obeys the Vogel-Fulcher law with the Vogel-Fulcher temperature of 89 K. This seems to be the reason for the domain freezing observed around 90 K as in the case of KH2PO4.
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  • Inelastic Scattering of γ-Rays by K-Shell Electrons of Metallic Copper and Iron. II. Resonant Three-Photon Processes
    Yoshihiro Ohmura, Sh\={u}ichi Sat\={o}
    1988 Volume 57 Issue 10 Pages 3599-3612
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3599
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    Resonant inelastic scattering of γ-rays by K-shell electrons due to 3-photon processes is investigated theoretically. Motivation of the present study is to investigate the DT peak found experimentally by Namikawa and Hosoya in the scattering of 59.57 keV γ-rays by K-shell electrons of metallic Cu. Two kinds of terms, which are the dominant resonant terms, are calculated. The DT peak found experimentally by Namikawa and Hosoya is concluded not to be explained by the resonant 3-photon processes.
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  • Reflection Spectra of Vibronic Excitons in NaNO2
    Hisao Kawaura, Yoshizo Kawaguchi, Riso Kato
    1988 Volume 57 Issue 10 Pages 3613-3620
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3613
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    Characteristics of the lowest singlet exciton in NaNO2 have been studied by the high resolution measurement of reflection spectra on the cleaved surface of the single crystal at 2 K. Several sharp reflection lines which correspond to the vibronic levels in NaNo2 have been observed in the near uv region. The observed spectra are discussed by using the dispersion relation for the exciton of the L–T mixed mode in an anisotropic medium. Basic quantities of the vibronic excitons, such as the exciton energies, oscillator strengths and damping constants are obtained by the curve fitting analysis based on a simple oscillator model.
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  • Luminescent V-Type Centers in Alkali Iodide Crystals Containing Divalent Cations
    Tadahiko Harami
    1988 Volume 57 Issue 10 Pages 3621-3631
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3621
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    Optical absorption and luminescence due to trapped hole centers produced by X-irradiation at 140 K are investigated for KI and RbI doped with Mg2+, Ca2+, Sr2+, Ba2+ or Pb2+. In Ca2+-doped KI, absorption spectrum shows three bands peaking at 367, 444 and 800 nm which arise from the same centers. When the sample is excited with light in any one of these bands at LNT, two emission bands peaking at 1540 and 1715 nm are observed. The other samples show similar bands too. Besides formation and anisotropy of the absorption bands, anisotropy and temperature dependence of the luminescence are studied. Then it is suggested that the center inducing these bands is a halogen atom stabilized by an I–V dipole. Interpretations are proposed for transitions inducing the absorption and luminescence. The vacancy model of the V center produced in halogen excess crystals is confirmed.
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  • Analysis of Raman Spectra from Heavily Doped p-GaAs
    Ryoichi Fukasawa, Shin’ichi Katayama, Akira Hasegawa, Kimihiro O ...
    1988 Volume 57 Issue 10 Pages 3632-3640
    Published: October 15, 1988
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3632
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    A theory of Raman scattering by both coupled LO phonon-plasmon (LO–PL) modes and surface “unscreened” LO phonons in a doped semiconductor is presented with a simple two-layer (surface depletion layer-bulk substrate) model. Effects of the optical penetration depth and the depletion layer thickness on the line shape are examined. The theory is applied to an analysis of Raman spectra from a (100) surface of p-GaAs, and reproduces experimental profiles very well. An analysis suggests that the observed broad band near the transverse optical phonon frequency is ascribed to the lower branch of the coupled LO–PL modes.
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  • Optical Phonons in Orthorhombic Indium Bromide Studied by Resonance Raman Scattering
    Kaizo Nakamura, Hideo Watanabe, Nobuhito Ohno, Masashi Yoshida, Yoshio ...
    1988 Volume 57 Issue 10 Pages 3641-3646
    Published: October 15, 1988
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3641
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    The anisotropy in longitudinal optical (LO) phonon spectra in orthorhombic indium bromide crystal has been confirmed by the resonance Raman scattering. By changing the crystal orientation with respect to the incident laser light, three LO phonon modes are identified referring to three principal crystallographic axes. Obtained LO phonon energies are 15.9, 17.0 and 15.5 meV for the B3u mode (along a axis), B2u (b axis) and B1u (c axis), respectively. A Raman forbidden transverse optical (TO) phonon scattering is also observed at 6.7 meV under the resonance condition.
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  • Pressure Manometer at Low Temperature
    Haruki Kawamura, Kyoji Tachikawa
    1988 Volume 57 Issue 10 Pages 3647-3648
    Published: October 15, 1988
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3647
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  • Nuclear Magnetic Resonance of LaCo5
    Hiroshi Yoshie, Yoji Nakamura
    1988 Volume 57 Issue 10 Pages 3649-3650
    Published: October 15, 1988
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.57.3649
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