Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
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Volume 59, Issue 7
Displaying 1-44 of 44 articles from this issue
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  • A Multidimensional Cubic-Interpolated Pseudoparticle (CIP) Method without Time Splitting Technique for Hyperbolic Equations
    Takashi Yabe, Takeo Ishikawa, Yusaku Kadota, Fumiaki Ikeda
    1990 Volume 59 Issue 7 Pages 2301-2304
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2301
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    A new numerical method is proposed for multidimensional linear advection equations. The scheme uses a cubic spatial profile within grids, and is described in an explicit form by assuming that both a physical quantity and its spatial derivative obey the given equation. The method gives a stable and less diffusive result without any flux limiter. Its extension to nonlinear equations with nonadvection term is straightforward.
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  • Generalized Chiral Universality
    Hikaru Kawamura
    1990 Volume 59 Issue 7 Pages 2305-2308
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2305
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    On the basis of symmetry and renormalization-group analysis, it is shown that there exists a hyperseries of universality classes characterized by two integers, m and n where m≤n, that is associated with essentially m-dimensional noncollinear spin ordering driven by the O(n)-symmetric interaction. This hyperseries includes, as special cases, standard O(n) Heisenberg universality (m=1) as well as the recently identified O(n) planar-chiral universality (m=2). Various exponents are calculated by the ε=4−d and 1⁄n expansions.
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  • On the Spatial Correlations in Nonequilibrium Systems
    Kazuo Kitahara, Kazuhiko Seki, Soichiro Suzuki
    1990 Volume 59 Issue 7 Pages 2309-2311
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2309
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    The conditions for the emergence of spatial correlations in a nonequilibrium steady state, proposed by Nicolis and Malek Mansour, are examined and generalized to systems involving many reversible chemical reactions. It is found that, by appropriately choosing controllable parameters, we can obtain a nonequilibrium steady state without spatial correlations.
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  • Calculation of Linear Dichroism in the Ce 4d-Core XAS and 4f Electronic State of CeRh3B2
    Takeo Jo, Shin Imada
    1990 Volume 59 Issue 7 Pages 2312-2315
    Published: July 15, 1990
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2312
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    Linear dichroism in Ce 4d-core photoabsorption for CeRh3B2 with a hexagonal structure is discussed on the basis of an impurity Anderson model. The model takes into account the hybridization between the 4f orbit and conduction band states, multiplets arising from electrostatic interactions between electrons and crystalline anisotropy. In the paramagnetic state of the compound, the difference in the multiplet structure of 4d XAS is calculated between two incident beams with polarizations parallel and perpendicular to the c-axis with varying the crystalline field to increase the occupancy of the 4f state with the azimuthal quantum number m=0. The result shows that the dichroism is a promising characteristic to check recent theoretical predictions on the occupancy of the 4f state with m=0 in CeRh3B2 and therefore, to measure the crystal anisotropy.
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  • Anomalous Damping of Quasiparticles in Two-Dimensional Fermi Systems
    Satoshi Fujimoto
    1990 Volume 59 Issue 7 Pages 2316-2319
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2316
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    We report an anomalous property of two-dimensional Fermi systems. The damping of quasiparticles in the conventional Fermi liquid is proportional to T2. This is altered in low-dimensional systems. In two dimensions, anomalous T-dependence of the damping, T2 ln T, is obtained by the Fermi liquid analysis. However, the Fermi liquid description can be constructed consistently, in contrast to the one-dimensional systems.
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  • Magnetoresistance and de Haas-van Alphen Effect in UB12
    Yoshichika \={O}nuki, Izuru Umehara, Yoshiko Kurosawa, Nobuyuki Nagai, ...
    1990 Volume 59 Issue 7 Pages 2320-2323
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2320
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    We have measured the magnetoresistance and de Haas-van Alphen (dHvA) effect in UB12. Shown by the result of magnetoresistance, this material is a compensated metal, and possesses an open orbit along the ⟨100⟩ direction. The detected dHvA branches are roughly explained by the recent band calculation performed by Harima et al. The cyclotron mass is in the range of 0.6 m0 to 6 m0.
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  • Direct Observation of Spin-Splitting of the Shubnikov-de Haas Oscillations in a Quasi-Two-Dimensional Organic Conductor (BEDT–TTF)2KHg(SCN)4
    Madoka Tokumoto, A. G. Swanson, J. S. Brooks, C. C. Agosta, S. T. Hann ...
    1990 Volume 59 Issue 7 Pages 2324-2327
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2324
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    A clear splitting in the Shubnikov-de Haas oscillation has been directly observed for the first time in a quasi-two-dimensional (2D) organic conductor (BEDT–TTF)2KHg(SCN)4. Analysis of the oscillations yields a 2D nature of the cylindrical Fermi surface, corresponding to 16% of the first Brillouin zone, with a small warping along the direction normal to the 2D layer. The condition for observation of spin-splitting and the evolution of the splitting pattern with a tilted magnetic field are discussed.
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  • New Tetracritical Behavior in CsMnBr3
    Tsuneaki Goto, Toshiya Inami, Yoshitami Ajiro
    1990 Volume 59 Issue 7 Pages 2328-2331
    Published: July 15, 1990
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2328
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    The magnetic phase diagram of CsMnBr3 has been determined from precise magnetization measurements. The single transition occurring in zero field splits into two successive transitions in a finite field applied in the c-plane. This indicates that the zero-field Néel point TN=8.32 K is a tetracritical point. The crossover exponents evaluated suggest that the tetracritical behavior is governed by the n=2 chiral universality.
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  • Electron Spin Resonance in Cupric Oxide
    Koichi Kindo, Makoto Honda, Teruo Kôhashi, Muneyuki Date
    1990 Volume 59 Issue 7 Pages 2332-2335
    Published: July 15, 1990
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2332
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    Paramagnetic and antiferromagnetic resonances of powdered CuO are investigated. Very broad paramagnetic resonance with the g-value of about 2.0 is observed above TN at the 45 GHz region under pulsed magnetic field. The linewidth is more than one Tesla and it is explained by the broadening due to the anisotropic exchange interaction between Cu2+ spins. One-dimensional spin correlation is seen in the line profile. The zero field antiferromagnetic resonance is found by means of the infrared absorption experiments in the temperature range between 5 K and 500 K. Two peaks at 350 and 510 cm−1 with the width of about 100 cm−1 are found. The result suggests that CuO might have a multisublattice structure even at low temperatures.
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  • Transverse Relaxation Rate of Cu-NQR in YBa2Cu3O7−y and La2−xSrxCuO4
    Ken-ichi Kumagai, Yoyu Nakamichi, Yuki Nakamura, Tomomasa Takatsuka, H ...
    1990 Volume 59 Issue 7 Pages 2336-2339
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2336
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    The temperature dependence of the nuclear transverse relaxation rate, 1⁄T2, of Cu-NQR in YBa2Cu3O7−y and La2−xSrxCuO4 is measured in the superconducting and the normal states. The anomalous enhancement of 1⁄T2 at the Cu(1) and Cu(2) sites is observed at 35 K in YBa2Cu3O7−y but is not observed in the superconducting La2−xSrxCuO4.
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  • Distribution of Nitrogen and Nickel in a Synthetic Diamond Crystal Observed with Scanning ESR Imaging
    Masahiro Furusawa, Motoji Ikeya
    1990 Volume 59 Issue 7 Pages 2340-2343
    Published: July 15, 1990
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2340
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    The spatial distribution of single substitutional nitrogen and nickel in a synthetic diamond crystal has been imaged with a microwave scanning ESR imaging method. The growth sectorial dependence of the concentration and the linewidth of nitrogen and nickel centers was observed with the resolution of 0.5 mm. The Ni-rich region was seen only at some parts of the (111) sectors while nitrogen was rich in the entire (111) sectors. The linewidth of the nitrogen signal qualitatively correlates with the concentration of nickel.
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  • A Jordan-Schwinger Representation of Quadratic Relations for SUq(2) Operators and of the q-Analog Wigner-Eckart Theorem
    Masao Nomura
    1990 Volume 59 Issue 7 Pages 2345-2354
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2345
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    A q-analog Jordan-Schwinger (QJS) representation is presented which affords q-analog boson operator realizations of Woronowicz’ and Witten’s quadratic relations of quantum group SUq(2). Emphasis is put on the q-analog Wigner-Eckart theorem. The QJS representation is applied to recursion relations for the Clebsch-Gordan coefficient of SUq(2). This leads to finding that subalgebras suq(1, 1) and suq(2) other than the ordinary suq(2) are embedded in the QJS representation.
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  • Temporal Evolution of Patterns in Quenched Twisted-Nematic Cells —Dynamics and Fractal—
    Hiroshi Orihara, Masaya Nakamura, Yoshihiro Ishibashi
    1990 Volume 59 Issue 7 Pages 2355-2358
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2355
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    The temporal evolutions of the assembly of disclination lines, as well as of a single line, are studied from the fractal viewpoint. It has turned out that the fractal dimension of the assembly is almost 2, while that of the single line is 1.65. We confirmed the validity of the relation μ=(D−DT)ν, where μ and ν are the exponents with respect to the disclination length and the characteristic length, respectively, and D and DT are the fractal and topological dimensions, respectively.
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  • B(E2) Branching and E2⁄M1 Mixing Ratios of Intra γ-Vibrational Band Transitions in Deformed Even-Even (150≤A≤190) Nuclei
    H. S. Binarh, S. S. Ghumman, H. S. Sahota
    1990 Volume 59 Issue 7 Pages 2359-2364
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2359
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    B(E2) ratois of K=2+ intra gamma vibrational band transitions are determined experimentally from the recently available data. The same are calculated on interacting boson model and the comparison of two demonstrates the applicability of original version of IBA-1 to the deformed rare-earth even-even nuclei. The E2⁄M1 mixing ratios calculated from Alaga rules, Greiner’s theory and IBA show that δI→I−12(E2⁄M1)≅2 is a constant feature of the stop over γ-band transitions in the entire deformed region.
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  • Some Characteristics of Exact Strained Solutions to the Two Dimensional Navier-Stokes Equations
    Masanori Takaoka
    1990 Volume 59 Issue 7 Pages 2365-2373
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2365
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    Exact strained solutions to the two dimensional Navier-Stokes equations are obtained which have two dimensional spatial periodic structures. The time developments of the circulation, the energy, the enstrophy and the palinstrophy are examined for several viscosities. In the inviscid limit, the enstrophy dissipation rate becomes independent of viscosity. The power spectrum of the energy behaves as k−3 in the inertial subrange for constant strain and different power laws are obtained depending on the time dependence of the strain.
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  • Experiments on Mode Conversion of m=−1 Fast Wave into Shear Alfvén Wave in a Cylindrical Plasma
    Yoshimitsu Amagishi
    1990 Volume 59 Issue 7 Pages 2374-2381
    Published: July 15, 1990
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2374
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    Experimental results are presented which show that the fast waves (MHD surface mode of compressional Alfvén waves) of the radial m=−1 mode, where m is the poloidal mode number, are mode converted on the Alfvén resonance layer. The fast waves were excited using a pair of small loop antennas located near the cylindrical chamber. The converted waves are a quasi-electrostatic form of the shear Alfvén waves, i.e. kinetic Alfvén wave and/or the resistive mode. The observed properties of the converted waves are in general agreement with theory.
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  • The Velocity of Sound in Liquid Pb–Te Alloys
    Yoshimi Tsuchiya, Toshikatsu Takahashi
    1990 Volume 59 Issue 7 Pages 2382-2386
    Published: July 15, 1990
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2382
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    Sound velocity, Vs, in the liquid Pb–Te alloy has been measured up to 1000°C. The isotherm of Vs as a function of concentration shows a characteristic point of inflexion at the stoichiometric PbTe. The compressibility deduced from Vs and density data has a cusp at the concentration corresponding to the inflexion. The results have been interpreted as being due to the existence of the ionic association PbTe in the melt.
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  • Neutron Scattering Study of Deuterated Dicalcium Strontium Propionate Ca2Sr(C2D5CO2)6
    Toshirou Yagi, Henry Chou, Stephen M. Shapiro
    1990 Volume 59 Issue 7 Pages 2387-2393
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2387
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    Strong critical scattering of neutrons is measured near the paraelectric-ferroelectric phase transition of deuterated dicalcium strontium propionate (DDSP). The amplitude of motion of the propionate radical in the (001) plane becomes large near the Curie temperature TC=279.5 K. The anisotropy in the distribution of the critically scattered intensity is weak compared with other ferroelectrics. The origin of the improper ferroelectricity of DDSP is attributed to the van der Waals interaction between the propionate radicals which induces secondarily fluctuation of polarization near TC.
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  • Transition State Theory for Kink Diffusion in Discrete Nonlinear Systems
    Toyonori Munakata, Akito Igarashi
    1990 Volume 59 Issue 7 Pages 2394-2399
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2394
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    Diffusion constant of a kink in discrete nonlinear systems, such as the φ4 and the Frenkel-Kontorova models, is studied based on the transition state theory(TST) and the newly proposed statistical mechanics of a constrained system. Our results are compared with the simulation results by Combs and Yip.
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  • Far-Infrared Magneto-Optical Investigation of p-Black Phosphorus in Pulsed High Magnetic Fields
    Shojiro Takeyama, Noboru Miura, Yuichi Akahama, Shoichi Endo
    1990 Volume 59 Issue 7 Pages 2400-2408
    Published: July 15, 1990
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2400
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    Systematic cyclotron resonance measurements have been performed on p-type black phosphorus in high pulsed magnetic fields up to 40 T using an optically pumped far-infrared laser. A new resonance peak has been observed in addition to the usual hole cyclotron resonance. It was found that there was a small portion of n-type crystals in some p-type samples. By considering this fact of coexistence of n- and p-type regions, a possible mechanism of doping in black phosphorus is proposed. The temperature coefficients of the effective masses of holes have been determined for the first time over a wide temperature range between 30 K and 220 K, in magnetic fields parallel to the a, b and c axes.
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  • Anisotropic Fractal Dimensionality of Electronic States in Confined Two Dimensional System Subject to Strong Magnetic Field
    Seiichi Fukuda, Yoshiyuki Ono
    1990 Volume 59 Issue 7 Pages 2409-2413
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2409
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    The anisotropic fractal dimensionality of the extended electronic states is studied for a two dimensional disordered system subject to a strong perpendicular magnetic field, through the system size dependence of the inverse participation number (IPN) of the eigenstates. The system is assumed to satisfy the periodic boundary condition in the y-direction, and the Dirichlet boundary condition in the x-direction. The case with short ranged impurity potentials is considered. Two kinds of effective dimensionalities dx* and dy* are obtained from the width (Lx) and the length (Ly) dependences of IPN. For the bulk extended states, dx* and dy* are estimated as 0.76±0.05 and 0.77±0.09, respectively. Through the analysis of the energy dependence of dx* and dy*, we find the crossover between very anisotropic extended states (edge states) and almost isotropic extended states (bulk extended states).
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  • Self-Consistent Dynamical Theory for the Anderson Lattice
    Chang-Il Kim, Yoshio Kuramoto, Tadao Kasuya
    1990 Volume 59 Issue 7 Pages 2414-2425
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2414
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    This paper presents formulation and results of a self-consistent dynamical theory which can describe the crossover from the local-moment state to the heavy-fermion state with decreasing temperatures. The theory is an extension of the non-crossing approximation (NCA) for the single-site model and incorporates the intersite interaction via self-consistent modification of the conduction-electron propagator. Detailed numerical results for single-particle excitations are presented which show that (i) the cooperative enhancement of the Kondo resonance occurs at temperatures higher than the Kondo temperature TK; (ii) a pseudogap develops around the energy of the Kondo resonance with decreasing temperatures; (iii) no new energy scale other than TK is generated in the heavy-fermion state.
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  • Self-Consistent Symmetrized Relativistic Augmented Plane Wave Method: Application to α-U
    Hiroshi Yamagami, Akira Hasegawa
    1990 Volume 59 Issue 7 Pages 2426-2442
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2426
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    By applying to Loucks’ theory the technique of the bispinor-type projection operator constructed with the double multiplier representations for non-symmorphic space groups, we obtain a symmetrized relativistic APW method for a calculation of the electronic structures in actinides. A self-contained description is given of a self-consistent band structure theory which is based on this method and the local-density approximation to the exchange-correlation potential. The method is applied to an investigation of the energy band structure, the density of states and the Fermi surface in α-U. The Fermi surface consists of various hole and electron sheets in four bands with strong 5f character. With small modifications, these Fermi surface sheets are shown to explain reasonably well the angular dependence of the de Haas-van Alphen effect observed in α-U.
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  • Anyons in Extended t-J Model
    Osamu Narikiyo, Kazuhiro Kuboki, Hidetoshi Fukuyama
    1990 Volume 59 Issue 7 Pages 2443-2456
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2443
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    The extended t-J model has been studied in the slave boson scheme. It is found that there exists some range of parameters where the chiral spin state is stabilized within a mean field approximation. The Chern-Simons Lagrangian for the gauge field, which represents the fluctuation of the phases of the order parameters and the local constraint, is obtained by integrating out spin fermion fields as in the undoped case [Wen, Wilczek and Zee: Phys. Rev. B39 (1989) 11413]. The coefficient of this term turns out to depend on doping. Due to the coupling to this Chern-Simons gauge field, hole bosons are transmuted into anyons.
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  • Electronic Structure of CeSn3
    Akira Hasegawa, Hiroshi Yamagami, Hiroyasu Johbettoh
    1990 Volume 59 Issue 7 Pages 2457-2467
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2457
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    Based on an itinerant-electron model for the 4f electrons, the energy band structure is calculated for CeSn3, known to be the heavy-electron system having the Kondo temperature of about 200 K, by a self-consistent relativistic APW method with the exchange and correlation potential in the local-density approximation. An itinerant-electron model assures that this compound is a compensated metal. The large, nearly spherical hole sheet of the Fermi surface explains one of the major frequency branches of the de Haas-van Alphen effect of the order 107 Oe. The electron sheet is essentially spherical but highly distorted by the strong 4f-Sn 5p hybridization. It explains clearly origins of all other major frequency branches. These results support the view that the 4f electrons in the heavy-electron Ce compounds should be treated by an itinerant-electron picture.
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  • Positive Magnetoresistances of Carbon Fibers
    Takeshi Hamada, Kazuto Kawakami, Masatoshi Furuyama, Tadao Tomioka
    1990 Volume 59 Issue 7 Pages 2468-2472
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2468
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    Magnetoresistances (MR) of pitch based carbon fibers annealed at 1000°C and 1200°C were measured at temperatures T from 2 to 30 K. Magnetic flux density B up to 1 T was applied parallel to the fiber axis. The MR’s were positive and were proportional to B2T−3⁄2. The positive MR’s were well described by the theory of Coulomb interactions including spin splitting of a weakly disordered electron gas in three dimensions which has been investigated by Lee and Ramakrishnan, Kawabata, and lsawa et al.
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  • Tunneling Conductance of a Bi2Sr2CaCu2O8-GaAs Junction: Temperature Dependence of the Gap
    Nobuaki Miyakawa, Daisuke Shimada, Tadaharu Kido, Nobuo Tsuda
    1990 Volume 59 Issue 7 Pages 2473-2482
    Published: July 15, 1990
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2473
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    Good correspondence between the structure in the tunneling conductance curve and the phonon density of states shows that they are really due to phonons at least in a single phonon frequency range. The structures disappeared at Tc suggesting that they are due to an exchange of phonons and not due to the inelastic tunneling. From the phonon positions, the gap parameter was found to have the BCS like temperature dependence. 2Δ(0)⁄kBTc=7.1. It is isotropic in the CuO2 plane. A conventional method to determine the gap from the conductance peak-to-peak distance is not bad.
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  • Magnetic Properties of Amorphous Fe–Nd Alloys
    Katsuhisa Nagayama, Hiromitsu Ino, Naoaki Saito, Yasuaki Nakagawa, Eij ...
    1990 Volume 59 Issue 7 Pages 2483-2495
    Published: July 15, 1990
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2483
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    Melt-spun amorphous Fe1−xNdx alloys (0.11≤x≤0.60) were investigated by the magnetization measurement up to 143 kOe and the Mössbauer spectroscopy. The coercive field at 4.2 K increases abruptly at around x=0.30 with increasing x, amounting to 53 kOe at x=0.40. The hyperfine field of 57Fe at 77 K is independent of x and about 300 kOe on an average, suggesting that the magnetic moment of Fe is about 2.0 μB/atom throughout this system. On this assumption and the measured magnetization at 4.2 K, it is estimated that the average Nd moment is about 3.2 μB/atom at the low x limit. This value corresponds to the free ion value of Nd3+. The Nd moment decreases with increasing x to one half, 1.6 μB/atom. A ferromagnetic cluster model with large random anisotropy is proposed for the high coercivity alloys of this system. Magnetization curves at 4.2 K are well explained by the model, by an adjustment of the parameters for the anisotropy energy of the cluster and the inter-cluster coupling. The concentration dependence of the coercive field is discussed briefly.
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  • Nuclear Magnetic Ordering in PrCu6
    Tsuneo Fukuda, Hidehiko Ishimoto, Hiroshi Fukuyama, Shinji Ogawa, Yosh ...
    1990 Volume 59 Issue 7 Pages 2496-2499
    Published: July 15, 1990
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2496
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    A static magnetization of a single crystal PrCu6 has been measured down to 1.5 mK in magnetic fields between 10 mT and 0.5 mT. The temperature dependence of the magnetization obeys a Curie-Weiss law with a positive Weiss temperature of 1.76±0.08 mK, independent of the applied magnetic field. A spontaneous magnetization is observed below 1.70 mK, suggesting the ferromagnetically ordered state below the temperature.
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  • Temperature and Concentration Dependence of Magnetic Birefringence of Magnetic Fluids
    Susamu Taketomi, Hiromasa Takahashi, Nobuyuki Inaba, Hideki Miyajima, ...
    1990 Volume 59 Issue 7 Pages 2500-2507
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2500
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    It was found experimentally that the magnetic birefringence of magnetic fluid thin films obeys a Curie-Weiss like law for all kinds of magnetic fluids except for a water-based one. The birefringence can be described by θ(T, H)=θaf(H)⁄[T−Ta+f(H)], where θ(T, H), H and T are the phase difference, the applied field and the temperature of the film, respectively, and θa is a positive constant. Ta and f(H) are also found to be expressed empirically by Ta=T0+κ ln c, f(H)=1−exp [−α(c)H], respectively, where c is a volume fraction of the colloidal particles, T0, κ are positive constants and α(c) is a function of c. Taking the empirical expression of θ into consideration, the free energy of the magnetic fluid is discussed using Landau’s phase transition theory.
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  • Analysis of Nuclear Relaxation Experiments in High Tc Oxides Based on Mila-Rice Hamiltonian
    Takashi Imai
    1990 Volume 59 Issue 7 Pages 2508-2521
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2508
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    Nuclear relaxation experiments of 63Cu, 17O and 89Y NQR/NMR in high Tc oxides have been analyzed within the frame of a phenomenological model proposed by Mila and Rice, supposing that only one spin freedom exists. It was shown quantitatively that 17(1⁄T1), 89(1⁄T1) and the approximate T-linear behavior of 63(1⁄T1) at higher temperatures can be associated with the same d-spin fluctuations around q∼0. The anisotropy data of 63(1⁄T1) were also explained consistently, from which the values of hyperfine coupling constants were determined. The contribution of antiferromagnetic d-spin fluctuations to 63(1⁄T1) was extracted from raw data without any adjustable parameters. The saturated value of it above ∼150 K is by an order of magnitude lower than that estimated in a localized moment scheme. A possible interplay between magnetism and superconductivity is also discussed.
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  • 159Tb NMR in TbNi3 and Related Compounds
    Kenji Shimizu, Yuzo Hashimoto
    1990 Volume 59 Issue 7 Pages 2522-2527
    Published: July 15, 1990
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2522
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    159Tb spin echo NMR measurements have been done on TbNi3, Tb1−xYxNi3 for x≤0.4, Tb(Ni1−xCux)3 for x≤0.1 and Tb(Ni0.96Al0.04)3. The NMR spectrum becomes rather broad with substituting Ni by Cu, while that for Tb(Ni0.96Al0.04)3 shows a well-resolved satellite structure. The magnetic moment of Tb in TbNi3 is deduced to be 8.1 μB for site I and 7.8 μB for site II from an analysis of the electric quadrupole interaction of 159Tb on the basis of a molecular field Hamiltonian.
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  • Dielectric Relaxation of CsBr:Pb2+ Crystal
    Hiroshi Asada
    1990 Volume 59 Issue 7 Pages 2528-2531
    Published: July 15, 1990
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2528
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    When annealed and successively quenched, the CsBr:Pb2+ shows peculiar absorption spectrum similar to that of CsI:Tl+. The type of defect responsible for the spectrum was investigated by measurements of dielectric loss and ionic thermocurrent. It seems that the defect is impurity-cation vacancy dipole.
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  • Dielectric Properties of Lithium Diborate (Li2B4O7) Single Crystal
    Shin-ichi Furusawa, Shoji Tange, Yoshihiro Ishibashi, Kazuo Miwa
    1990 Volume 59 Issue 7 Pages 2532-2535
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2532
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    The frequency and temperature dependences of dielectric properties of lithium diborate (Li2B4O7) single crystal were investigated from 100 Hz to 100 kHz. Anomalous behavior of the real part of the dielectric constant ε′ was observed in the temperature range 300∼600 K. The anomaly observed in ε′ may be due to dielectric relaxation caused by the ionic conduction. The behavior of imaginary part of dielectric constant ε″ can be well explained in terms of the ionic conduction.
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  • Optical Properties of One-Dimensional Quasi-Periodic Crystals. I. Optical Reflectivity Spectrum of a Fibonacci Lattice
    Hiroshi Miyazaki, Masahiro Inoue
    1990 Volume 59 Issue 7 Pages 2536-2548
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2536
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    Optical reflectivity of the semiconductor Fibonacci superlattice is calculated. The frequencies at which spiky singularities appear in the spectrum exhibit the self-similar and nested structure. An analytic expression of the reflectivity spectrum is derived by assuming that the difference of the dielectric constants of the constituent layers is small. Based on the analytic expression, the reflectivity spectrum is analyzed. The effect of fluctuation of layer thickness is also investigated analytically.
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  • Optical Properties of One-Dimensional Quasi-Periodic Crystals. II. Modified Fibonacci Lattice with Arbitrary Initial Conditions
    Masahiro Inoue, Hiroshi Miyazaki
    1990 Volume 59 Issue 7 Pages 2549-2562
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2549
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    Optical properties are reported for a class of quasi-periodic superlattices generated by the rule S(n+1)=S(n)pS(n−1). p is a positive integer and the first two generations S(1) and S(2) are chosen arbitrarily. The reflectivity spectrum shows the same fractal structure as that of the Fibonacci lattice reported in the preceding paper. The self-similarity factor of the spectrum is found to be σ(p)=(\sqrtp2+4−p)⁄2 independent of the initial generations. Analytic expressions are given of the structure factor and the reflectivity within the bilinear approximation.
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  • Optical Properties of One-Dimensional Quasi-Periodic Crystals. III. Optical Reflectivity Spectrum and Structure Factor of a Generalized Fibonacci Lattice
    Hiroshi Miyazaki, Masahiro Inoue
    1990 Volume 59 Issue 7 Pages 2563-2577
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2563
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    Optical properties are studied of a generalized semiconductor Fibonacci superlattice generated by the rule Sn+1=SnpSn−1q with a pair of positive integers p and q. The initial generations S1 and S2 are arbitrary. Based on the multi-product representation of the reflectance function or the structure factor an analysis is presented of the fractal structure of the spectrum. An analytic expression is derived for the peak positions with a new labeling scheme. This scheme enables us to generalize the description of the self-similarity and the nested structure of the spectrum. The self-similarity factor σ(p, q) is obtained as a function of p and q which is rational for p=q−1.
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  • Catalytic Reaction of C3H6 over VO2
    Mariko Tomizuka, Daisuke Shimada, Nobuo Tsuda
    1990 Volume 59 Issue 7 Pages 2578-2583
    Published: July 15, 1990
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2578
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    Catalytic reaction of C3H6 was investigated over VO2 below and above the metal-insulator transition temperature. Metathesis occurred around that temperature though the apparent reactivity was very small. The metathesis products, t,c2-C4H8 decreased at the transition in the metallic range. It was compared with the prior results over KxMoO3 where the reactivity peak shifted to higher temperature in the metallic state.
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  • A Theory of Optical Anisotropy Decay in Membranes
    Shigeyuki Komura, Yoshihiro Ohta, Suguru Kawato
    1990 Volume 59 Issue 7 Pages 2584-2595
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2584
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    The theory of optical anisotropy decay r(t) for a protein in a membrane suspension is developed. Our new model describes rotational diffusion of membrane anchored proteins consisting of two different modes occurring simultaneously: one is restricted wobbling of the whole or part of the protein molecule, and the other is rotation of the whole protein about a fixed axis. The anisotropy decay r(t) is characterized by a diffusion coefficient, a cone angle and an angle between the symmetric axis of the wobbling part of the protein and the optical moment of the probe fixed rigidly in the protein. Although the exact r(t) consists of infinite number of exponential functions, an accurate monoexponential plus constant approximation for r(t) is shown to be sufficient for the analysis of experimental data. We derived an analytic expression for the effective relaxation time which appears in this approximation. This treatment may be applicable to complex wobbling plus axial rotation of membrane anchored proteins such as cytochrome b5.
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  • A Magnetic Configuration for the Poloidal Divertor with the Conducting Shell
    Hisaya Sugimoto, Takasi Kurasawa, Hisao Ashida, Kiyoshi Hayase
    1990 Volume 59 Issue 7 Pages 2596-2597
    Published: July 15, 1990
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2596
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  • Critical Behavior of Modulus of Poly(vinylalcohol) Gels near the Gelation Point
    Toshikazu Takigawa, Hisahiko Kasihara, Kenji Urayama, Toshiro Masuda
    1990 Volume 59 Issue 7 Pages 2598-2599
    Published: July 15, 1990
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2598
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  • The Temperature Dependence of the Internal Mode Raman Scattering Intensity in DKDP
    Masaru Kasahara, Kiyosi Motida, Mizuhiko Ichikawa
    1990 Volume 59 Issue 7 Pages 2600-2601
    Published: July 15, 1990
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2600
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  • Anomalous Paramagnetic Property of NdNbO4 Single Crystals
    Hiroshi Yamauchi, Shin Tsunekawa, Shoichi Tomiyoshi, Tsuguo Fukuda, Ta ...
    1990 Volume 59 Issue 7 Pages 2602-2603
    Published: July 15, 1990
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2602
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  • Localized State Due to Iodine Ions in TlBr
    Atsuhiro Fujii
    1990 Volume 59 Issue 7 Pages 2604-2605
    Published: July 15, 1990
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.59.2604
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