Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
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Volume 65, Issue 8
Displaying 51-72 of 72 articles from this issue
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  • Uncompensation Effect in a One-Dimensional Alternating-Spin Ising Ferrimagnet with Competing Interactions
    Jong–Jae Kim, Shigeyoshi Mori, Isao Harada
    Subject area: Magnetic properties and materials.
    1996 Volume 65 Issue 8 Pages 2624-2631
    Published: August 01, 1996
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.65.2624
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    The characteristic short-range orders (SROs) in a one-dimensional Ising ferrimagnet, which is composed of alternating spins withdifferent spin quantum numbers, Lande g-factors, and next-nearest-neighbor interactions, are investigated by the numerically exact calculation ofa nonsymmetric transfer matrix.Due to the uncompensating moments, some SROs in the system show very different characteristics from those in the uniform-spin ANNNI chain; (i) the peculiar two-peaked structure of the static spin structure factor {\cal S}(q), indicatingnot two different SROs but the same SRO, and (ii) an unusual thermal recovery of the ferrimagnetic SRO, carrying three disorder points, under a non-zero external field.Decaying features of the characteristic SROs and the magnetic behavior of the system with variation of external field are alsodiscussed.
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  • Analysis for Softening of Elastic Constant and Specific Heat in CePd2Al3 - Quadrupole Response Induced by the Kondo Effect -
    Yukihiro Shimizu, Osamu Sakai
    Subject area: Magnetic properties and materials.
    1996 Volume 65 Issue 8 Pages 2632-2639
    Published: August 01, 1996
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.65.2632
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    We analyze the temperature dependence ofthe specific heat and the quadrupole susceptibilityfor CePd_2Al_3, in which the Kondo effect coexistswith the crystalline electric field (CEF) excitation.The calculation is carried out systematicallyby using the numerical renormalization group method.The ratio Δ / Tk^o(Δ: the CEF excitation energy, T_k^o: the Kondo temperature for the fictitious system of Δ= 0)is estimated to be about 1.2 from the data of magnetic specific heat.The observed softening of C33 mode at very low temperature, which is expected to vanish in hexagonal compound such as CePd2Al3from the conventional CEF theory, is explained by considering the Kondo effect.
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  • Magnetic Phase Diagram of Dy Determined by AC Calorimetry
    Tomohisa Izawa, Keisuke Tajima, Yoshiyasu Yamamoto, Makiko Fujii, Osam ...
    Subject area: Magnetic properties and materials.
    1996 Volume 65 Issue 8 Pages 2640-2644
    Published: August 01, 1996
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.65.2640
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    The magnetic phase diagram of Dy has been determined by the specific heat measurement. The magnetic field up to 17, kOe has been applied along the a-axis which is the easy direction of magnetization. Most of results are in agreement with previous magnetization and magnetoresistance mesurements but new phase boundaries have been found in the present observation. Results indicate that the magnetic structure in “fan” phase may be not a simple structure.
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  • Magnetic Properties of Organic Conductor (BEDT-TTF)_3CuBr_4
    Jun–Ichi Yamaura, Kazuya Suzuki, Youkoh Kaizu, Toshiaki Enoki, K ...
    Subject area: Magnetic properties and materials.
    1996 Volume 65 Issue 8 Pages 2645-2654
    Published: August 01, 1996
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.65.2645
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    (BEDT-TTF)_3CuBr_4 is a two-dimensional organic conductor whose structure consists of alternate stacking of BEDT-TTF π conducting sheets and magnetic Cu2+ sheets.We investigate magnetic susceptibility, magnetization and ESR in order to clarify the correlation between the magnetism and the electronic structure.Above a structural transition Tc=59, K, the magnetic susceptibility indicates the presence of strong antiferromagnetic interaction between the π-electrons on BEDT-TTF and the localized d-electrons on Cu2+.The transition brings about the disappearance of the magnetic moments of BEDT-TTF molecules below Tc, which indicates the change from a Mott insulator to a band insulator state.Below Tc, the susceptibility is governed only by Cu2+ spins, and shows an antiferromagnetic transition at TN=7.65, K, where the π-electrons play an important role in the exchange interactions.
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  • 51V NMR Study in the Paramagnetic State of LaVO_3
    Jun Kikuchi, Hiroshi Yasuoka, Yasuki Kokubo, Yutaka Ueda, Tsukio Ohtan ...
    Subject area: Magnetics resonances and relaxations in condensed matter; MÖssbauer effect.
    1996 Volume 65 Issue 8 Pages 2655-2663
    Published: August 01, 1996
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.65.2655
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    The magnetic susceptibility (χ ) and the 51V Knight shift (K) measurements are performed on the perovskite LaVO3 in the paramagnetic state. By analyzing the K-χ diagram, independent contributions of spin and orbital susceptibilities to the observed one are determined experimentally. The spin susceptibility was found to be suppressed from the Curie-Weiss law for S=1 spins well above the Néel temperature. It was also found that the hyperfine coupling constant for d spin is largely reduced from the usual core-polarization contribution. The analysis based on a local-moment model shows that this reduction may be caused by a large transferred hyperfine coupling between the neighboring V3+ ions rather than by covalency with O2- ions. This accounts for all the NMR data rather quantitatively, though, the sign and the magnitude of the transferred hyperfine field are not compatible with any existing microscopic theories.
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  • The Origin of the Nonexistence of Prototypic Paraelastic Phase in (NH_4)_2SO_4
    Jeong–Lyong Kim, Kwang–Sei Lee
    Subject area: Dielectric properties and materials.
    1996 Volume 65 Issue 8 Pages 2664-2669
    Published: August 01, 1996
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.65.2664
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    We have found the high-temperature dielectric anomaly around 130°C (Tp) even on first heating of virgin crystal of ferroelastic ammonium sulfate (NH4)2SO4. It has been observed by using polarizing microscope that after heat treatment above Tp the multigrains appeared in the ferroelastic domain, indicating that the nature of the high-temperature anomaly around Tp is of topochemistry, i.e., not related to the high-temperature phase transition but related to chemical change accompanied by partial thermal decomposition at the surface of crystals. This work suggests the origin of nonexistence of prototypic phase in ferroelastic (NH4)2SO4.
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  • Photonic Bands Using Vector Spherical Waves. III. Group-Theoretical Treatment
    Kazuo Ohtaka, Yukito Tanabe
    Subject area: Dielectric properties and materials.
    1996 Volume 65 Issue 8 Pages 2670-2684
    Published: August 01, 1996
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.65.2670
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    The group-theoretical treatment for photonic bands is given. The symmetry-adapted plane-wave bases are given for the eigenvectors of the electric fields and the transformation properties of the vector spherical-waves are clarified. For a fcc array of dielectric spheres, the group-theoretical band assignment is presented and the result is used to clarify the origins of the difference from band to band, concerning the mixing between transverse and longitudinal components, the activity to an incident light in the reflectivity, the mutual orthogonality of the eigenvectors and so on.Promising application of photonic crystal as a useful polarizer of light is proposed.
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  • High-Resolution Photoemission Study of UNi_2Al_3 and URu_2Si_2
    See–Hun Yang, Hiroshi Kumigashira, Takayoshi Yokoya, Ashishi Cha ...
    Subject area: Electron and ion emission by liquids and solids; impact phenomena.
    1996 Volume 65 Issue 8 Pages 2685-2689
    Published: August 01, 1996
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.65.2685
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    High-resolution low-temperature photoemission spectroscopy has been performed for UNi2Al3 and URu2Si2 to study the nature of 5f electrons in U-based heavy fermion materials. Photoemission spectra of both compounds have a sharp peak at EF and a large broad peak around 2, eV, while only UNi2Al3 exhibits an additional small broad feature at 0.6, eV. The two features in the vicinity of EF (the EF-peak and the small structure at 0.6, eV) are found to have a dominant U 5f character while the prominent peak around 2, eV is due to the Ni 3d or Ru 4d states. Comparison with the band structure calculations and experimental results on UPd2Al3 suggests that the EF-peak is ascribed to itinerant U 5f electrons while the following broad feature at 0.6, eV represents localized f electrons.
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  • Temperature Dependence of Relaxation Time of Water in NaCl Aqueous Solution by Low-Frequency Raman Spectroscopy
    Kohji Mizoguchi, Yasunori Tominaga
    Subject area: Physical chemistry.
    1996 Volume 65 Issue 8 Pages 2690-2693
    Published: August 01, 1996
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.65.2690
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    Depolarized low-frequency Raman spectra of NaCl aqueous solution in the frequency region below 250, cm-1 have been investigated as a function of temperature. The spectral profiles have been analyzed with a superposition of one Cole-Cole type relaxation mode and two damped harmonic oscillator modes. The reciprocal relaxation time τ -1 changes linearly as a function of temperature below 320, K, which means that the relaxation time τ obeys Curie-Weiss law. The distribution parameter β in the Cole-Cole type relaxation formula decreases with decreasing temperature. With decreasing temperature the reciprocal relaxation time τ -1 goes down toward to zero more slowly than that in water, which means that the value of Curie constant of NaCl aqueous solution is larger than that of water.
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  • Multicanonical Monte Carlo Simulation of a Polymer with Stickers
    Naohito Urakami, Masako Takasu
    Subject area: Physical chemistry.
    1996 Volume 65 Issue 8 Pages 2694-2699
    Published: August 01, 1996
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.65.2694
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    We study the temperature dependence of the behavior of a polymer chain withstickers by using multicanonical Monte Carlosimulations. For our two-dimensional model, we performedequilibrium calculations and obtained physical quantities at lowtemperatures. We calculated the radius of gyration and the end-to-enddistance and found that those quantities drastically change betweenthe temperature kT/u_0=0.1 and 0.2. As the temperature is lowered, the value of the exponent ν becomes slightly smaller than the high temperature case.We also investigated the distribution of gyration radius and winding angle.
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  • Morphological Diversity of the Colony Produced by Bacteria Proteus mirabilis
    Akio Nakahara, Yuji Shimada, Jun–ichi Wakita, Mitsugu Matsushita ...
    Subject area: Biophysics.
    1996 Volume 65 Issue 8 Pages 2700-2706
    Published: August 01, 1996
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.65.2700
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    Morphological changes of colonies have been investigated for a bacterial strain of Proteus mirabilis, which is a famous species for producing concentric-ring-like colonies. It was found that colony patterns can be classified into three types, i.e., cyclic spreading, diffusion-limited growth (DLA-like) and three-dimensional growth (inside the agar medium) patterns. Cyclic spreading patterns can further be classified into three subgroups, i.e., concentric-ring, homogeneous and spatiotemporal patterns. These subgroups were classified by examining the development of colony structure after colonies spread all over petri-dishes. Comparison of the results with those of another bacterial species Bacillus subtilis is also discussed.
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  • Experimental Study of the Growth of the Cholesteric Finger Pattern
    Tomoyuki Nagaya, Yasuhiro Hikita, Hiroshi Orihara, Yoshihiro Ishibashi
    Subject area: Other areas of research of general interest to physicists.
    1996 Volume 65 Issue 8 Pages 2707-2712
    Published: August 01, 1996
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.65.2707
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    The growth process of the cholesteric finger pattern, appearing in a large pitch cholesteric liquid crystal sandwiched between glass plates, has been experimentally investigated. Depending on the cell gap and the external electric field, several patterns of different kinds are observed. The characteristic feature of the patterns is extracted from the observed image and then the dynamical behavior of the patterns is discussed. Moreover, the formation process of the dendritic finger pattern is analyzed on the basis of the Avrami model.
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  • Numerical Study of the Growth of the Cholesteric Finger Pattern
    Tomoyuki Nagaya, Yasuhiro Hikita, Hiroshi Orihara, Yoshihiro Ishibashi
    Subject area: Other areas of research of general interest to physicists.
    1996 Volume 65 Issue 8 Pages 2713-2716
    Published: August 01, 1996
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.65.2713
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    The growth of the cholesteric finger pattern appearing in a large pitch cholesteric liquid crystal has been numerically investigated.The time evolution of director field is calculated from a motion of equation constructed from the Frank elastic free energy density.It is found that the director field in a finger obtained from the calculation is almost the same as the one from the model of cholesteric finger proposed by Lequeux et al.The characteristic feature of the growth of the finger pattern could be reproduced by the simulation.
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  • Exploring Solutions of Nonlinear Rossby Waves in Shallow Water Equations
    B. Bagchi, C. Venkatesan
    Subject area: Geophysics, astronomy, and astrophysics.
    1996 Volume 65 Issue 8 Pages 2717-2721
    Published: August 01, 1996
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.65.2717
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    We study shallow water equations to derive analytical conditions for the existence of finite amplitude nonlinear wave solutions. The bounded solutions obtained by us include solitary wave, periodic trigonometrical and decaying exponential types.
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  • Computer Search of Rare-Earth Atomic Levelsfor Atomic Parity Violation Experiments
    Takashi Kobayashi, Ichita Endo, Atsushi Fukumi, Takayoshi Horiguchi, Y ...
    Subject area: Atomic spectra and interactions of atoms with photons.
    1996 Volume 65 Issue 8 Pages 2722-2723
    Published: August 01, 1996
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.65.2722
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  • X-Ray Photoemission Spectra of S 2s Core Level in the Charge-Transfer Type Mixed Metallic System: (Co_{1-{x}}Nix)0.91S
    Shuichiro Anzai, Teruki Motohashi, Masanori Matoba, Atsushi Fujimori
    Subject area: Electron states in condensed matter.
    1996 Volume 65 Issue 8 Pages 2724-2725
    Published: August 01, 1996
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.65.2724
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  • Magnetic Order and Fermi Surface in CeAs. II
    Tadao Kasuya
    Subject area: Electron states in condensed matter.
    1996 Volume 65 Issue 8 Pages 2726-2727
    Published: August 01, 1996
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.65.2726
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  • de Haas-van Alphen and Shubnikov-de Haas Effect in CeAs
    Shigeki Nimori, Haruyoshi Aoki, Taichi Terashima, Giyuu Kido, Takashi ...
    Subject area: Electron states in condensed matter.
    1996 Volume 65 Issue 8 Pages 2728-2729
    Published: August 01, 1996
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.65.2728
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  • The Influence of Injection Properties on the Electron Scattering Dynamics of Ballistic Cavities
    Richard P. Taylor, Jonathan P. Bird, Richard Newbury
    Subject area: Electronic transport in condensed matter.
    1996 Volume 65 Issue 8 Pages 2730-2731
    Published: August 01, 1996
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.65.2730
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  • Effect of Pressure on the Magnetoresistance of the Heavy Fermion Compound CeAl_3
    Gendo Oomi, Tomoko Kagayama
    Subject area: Electronic transport in condensed matter.
    1996 Volume 65 Issue 8 Pages 2732-2733
    Published: August 01, 1996
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.65.2732
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  • Observation of the Energy Gap due to the Quantum TunnelingMaking Use of the Landau-Zener Mechanism
    Seiji Miyashita
    Subject area: Magnetic properties and materials.
    1996 Volume 65 Issue 8 Pages 2734-2735
    Published: August 01, 1996
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.65.2734
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  • 141Pr and 147 Sm Spin-Echo NMR in R_mib xGd_1-mib xNi ( R=Pr and Sm)
    Kenji Shimizu, Kazuyoshi Ichinose, Katsuhiko Nishimura
    Subject area: Magnetics resonances and relaxations in condensed matter; MÖssbauer effect.
    1996 Volume 65 Issue 8 Pages 2736-2737
    Published: August 01, 1996
    Released on J-STAGE: October 01, 1999
    DOIhttps://doi.org/10.1143/jpsj.65.2736
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