Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
Volume 52, Issue 6
Displaying 1-50 of 56 articles from this issue
  • Amand Faessler, Masamiti Wakai
    1983 Volume 52 Issue 6 Pages 1875-1877
    Published: June 15, 1983
    Released on J-STAGE: May 29, 2007
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    The optimal γ multiplicity for the investigation of the giant dipole resonance built on high spin states is studied. A heavy ion fusion reaction (HI, xn) and the emission of neutrons and γ rays is simulated by Monte Carlo calculations for 128Te(34S, 4n)158Er(E1ab=155 MeV).
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  • Hideki Yamazaki, Shoichi Kai, Kazuyoshi Hirakawa
    1983 Volume 52 Issue 6 Pages 1878-1881
    Published: June 15, 1983
    Released on J-STAGE: May 29, 2007
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    Flow patterns in an electrohydrodynamic instability of a nematic liquid crystal are investigated in the region from two-dimensional flow (WD) to three-dimensional one (GP), using spatial Fourier analysis of patterns. The characteristic behaviors of two modes perpendicular (q) and parallel (q⁄⁄) to the WD rolls are obtained. The large fluctuations exist in the transition region for both cases, resulting to excite band-like spectra. According to the spectrum of q⁄⁄, the spatially regulated GP comes out clearly at the normalized field k≥1.7, whose power linearly increases with increase of k.
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  • Hikaru Terauchi, Satoshi Iida, Saburo Motomi, Hironobu Maeda, Tadao Is ...
    1983 Volume 52 Issue 6 Pages 1882-1883
    Published: June 15, 1983
    Released on J-STAGE: June 01, 2007
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    X-ray scattering intensity from a superionic Cu1.8Se single crystal was carefully measured at room temperature. Two diffuse maxima were observed near the scattering vectors K=(1.25, 1.25, 1.25) and (1.84, 1.84, 1.84).
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  • Toshiaki Iwazumi, Satoshi Iida, Hikaru Terauchi
    1983 Volume 52 Issue 6 Pages 1884-1885
    Published: June 15, 1983
    Released on J-STAGE: May 29, 2007
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    X-ray scattering experiments on a superionic Cu1.8Se single crystal were carried out at low temperatures. The superlattice reflections with the wave vector q=(1/4, 1/4, 1/4) were found below T2=280 K. Below T1=182 K, the superlattice reflections with q=(1/7, 1/7, 1/7) were also found.
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  • Kazuhiko Yamaya, Gendo Oomi
    1983 Volume 52 Issue 6 Pages 1886-1887
    Published: June 15, 1983
    Released on J-STAGE: May 29, 2007
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    The lattice parameters of NbSe3 were measured under pressure up to ca. 35 kbar and found to show no anomalous variation around 6 kbar where the pressure coefficient of superconducting transition temperature, dTc⁄dP, changes its sign. It is concluded that the crystal structure is not modified under pressure, and suggested that the change in sign of dTc⁄dP is due to an electron origin. Anisotropy of the compressibilities were observed and discussed in relation with the anisotropic nature of the chemical bondings in NbSe3 crystal.
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  • Tetsuro Saso, C. I. Kim, Tadao Kasuya
    1983 Volume 52 Issue 6 Pages 1888-1889
    Published: June 15, 1983
    Released on J-STAGE: June 01, 2007
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    Report is given on a computer simulation of the dynamical conductivity σ(ω) of one-dimensional disordered systems with up to 106 sites by MacKinnon’s method. A comparison is made with the asymptotically exact solution valid for weak disorder by Berezinskii.
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  • Mototada Kobayashi, Tsuyoshi Murao, Ikuji Tsujikawa
    1983 Volume 52 Issue 6 Pages 1890-1892
    Published: June 15, 1983
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    The superconductivity in the first stage potassium graphite intercalation compound is discussed in connection with the electron transfer rate from potassium atom to graphite layers. From this discussion together with the experimental result that transition temperature Tc depends little on the K atom concentration above a critical concentration, we conclude that the superconductivity takes place mainly on the graphite layer. The mechanism to increase three dimensional character with decreasing K atom concentration is also discussed.
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  • Nobuo Wada, Ken Sumiyoshi, Takashi Watanabe, Kiichi Amaya
    1983 Volume 52 Issue 6 Pages 1893-1896
    Published: June 15, 1983
    Released on J-STAGE: June 01, 2007
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    The triangular XY-like antiferromagnet RbFeCl3 shows successive incommensurate-incommensurate-commensurate phase transitions with decreasing temperature in zero field. The T-H phase diagram in the easy plane is determined by the susceptibility measurement. Two new ordered states are found in the magnetic field region between 5 and 22 kOe. Magnetic aftereffects are observed in the commensurate phase at the lowest temperatures in zero field. The susceptibility just after the demagnetization is larger than that before the field application and decreases with a logarithmic time decay.
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  • Kiyoshi Deguchi, Noriari Aramaki, Eiji Nakamura, Kuninobu Tanaka
    1983 Volume 52 Issue 6 Pages 1897-1900
    Published: June 15, 1983
    Released on J-STAGE: May 29, 2007
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    Complex dielectric constants of (CH3NHCH2COOH)3·CaCl2 and (CH3NDCH2COOD)3·CaCl2 have been measured. between 104 Hz and 109 Hz in the Curie temperature region. No appreciable isotope effect was found in the complex dielectric constants as well as in the Curie temperature. Dielectric dispersion of the Debye type which showed a critical slowing-down was observed above about 100 MHz. Discussion was made of the relation between the observed critical slowing-down and the softening of the optical phonon reported previously.
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  • Bunji Mizuno, Katsumi Tanimura, Noriaki Itoh
    1983 Volume 52 Issue 6 Pages 1901-1903
    Published: June 15, 1983
    Released on J-STAGE: June 01, 2007
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    The yield of F-H pairs in KBr upon photo-excitation of the electron of the self-trapped excitons to n≥3 orbitals is found to be much lower than that upon photoexcitation to the n=2 orbitals and than the overall yield of the F centers under ionizing radiation. The results imply that the de-excitation pathways of excited self-trapped excitons and the electron trapped by the self-trapped holes are different.
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  • Takuya Matsuda
    1983 Volume 52 Issue 6 Pages 1904-1907
    Published: June 15, 1983
    Released on J-STAGE: May 29, 2007
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    It is pointed out that the weather in a space colony proposed by O’Neill is considerably different from that on the earth. Atmospheric circulation is produced by a temperature difference between the land area and the window area, and it is restricted within the thermal boundary layer. On the ‘window shore’, strong ‘window-wind’ blows in a day time.
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  • Masayoshi Tajiri
    1983 Volume 52 Issue 6 Pages 1908-1917
    Published: June 15, 1983
    Released on J-STAGE: June 01, 2007
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    Similarity solutions of the one and two-dimensional nonlinear Schrödinger equations are studied by means of Lie’s method of infinitesimal transformation groups. It is shown that the two-dimensional nonlinear Schrödinger equation can be reduced to the nonlinear Klein-Gordon equation and others, and the solution of the one-dimensional nonlinear Schrödinger equation for a similarity variable is reducible to the second Painlevé transcendent. Some similarity solutions of the equations are obtained.
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  • Akira Nakamura
    1983 Volume 52 Issue 6 Pages 1918-1920
    Published: June 15, 1983
    Released on J-STAGE: June 01, 2007
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    It is shown that the quasi-vortex type solutions recently studied by Hudák of the sine-Gordon equation, uxx+uyy=sin u, can be derived from the known multiple soliton solutions by the proper procedure. This shows in principle the existence of the multiple quasi-vorte solutions. It also shows that the superposition of usual solitons and quasi-vortex solutions are possible for this equation. Implication of the present results to other soliton equations is briefly discussed.
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  • Kazuaki Narita
    1983 Volume 52 Issue 6 Pages 1921-1929
    Published: June 15, 1983
    Released on J-STAGE: June 01, 2007
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    A new nonlinear difference differential equation [(∂⁄∂t)+f(vn) th 1⁄2(∂⁄∂n)]vn(t)=0 is investigated for three types of f(v); (A)f(v)=v, (B)f(v)=2v1⁄2, (C)f(v)=(v2−1)1⁄2. The N-soliton solution and the periodic solution are obtained for the cases (A) and (B), and the solitary wave solution and the periodic solution are obtained for the case (C).
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  • Akira Hasegawa
    1983 Volume 52 Issue 6 Pages 1930-1934
    Published: June 15, 1983
    Released on J-STAGE: June 01, 2007
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    Result of the self-organization hypothesis is applied to explain the wind structures in the Jovian and the Saturnian atmospheres as observed recently by Voyager spacecrafts. Qualitative as well as quantitative agreements are obtained in the magnitude of the wind velocities and the widths of the zonal flow by means of fitting only one unknown parameter, φ=hH, the relative variation of the atmospheric scale height.
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  • Masahiro Nakagawa, Tadashi Akahane
    1983 Volume 52 Issue 6 Pages 1935-1945
    Published: June 15, 1983
    Released on J-STAGE: June 01, 2007
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    A simple model of lipid molecules is proposed. The properties of phase transitions in lipid systems are qualitatively studied in the framework of mean field approximations. The interactions between the two alkyl chains and between the polar head groups of lipid molecules are taken into account and those effects on the phase transitions are investigated. The present theoretical results indicate that the chain flexibility and an appropriate strength of the chain-chain interaction in a lipid molecule are required for the existence of the liquid crystalline phase, and that the main transition temperatures are mainly affected by the interactions between alkyl chains whereas the melting transition temperatures strongly depend on the interactions between the polar head groups rather than between the alkyl chains.
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  • Masatoshi Imada
    1983 Volume 52 Issue 6 Pages 1946-1956
    Published: June 15, 1983
    Released on J-STAGE: June 01, 2007
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    Chaotic behavior is found to be generated through the interaction of nonlinear excitations in the non-integrable systems with infinite degrees of freedom. The perturbed sine-Gordon equation is investigated by using the numerical simulation, which shows that the chaos is caused by soliton-soliton collisions. The orbital instability generated at the collision spot propagates spatially. This mechanism is effective to the onset of the chaos both for energy conserved and non-conserved perturbation.
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  • Shigeru Morita, Junji Fujita
    1983 Volume 52 Issue 6 Pages 1957-1968
    Published: June 15, 1983
    Released on J-STAGE: June 01, 2007
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    All the X-ray lines associated with K-shell from an iron plasma have been observed. Transition wavelengths of the He-like resonance series lines up to 1s6p-1s2 have been determined for the first time. The structures of Kα He-like and Kβ Li-like satellites are described in detail. A highly resolved Kα spectrum of FeXXIV and FeXXV has been observed and the plasma parameters were defer-mined from the intensity ratios of intercombination line y, dielectronic satellite j and satellite q due to inner-shell excitation to resonance line w and the line broadening of w, i.e., ne\simeq1021 cm−3, Te\simeq2.2 keV, the ionization temperature Tz\simeq0.8 keV and Ti\lesssim4 keV. These parameters show that the plasma is mainly under the transient ionizing condition. Comparison between the observed and calculated intensity ratios among the He-like resonance series lines in C–R model gives an evident proof for the ionizing plasma.
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  • Kiyoshi Murakawa
    1983 Volume 52 Issue 6 Pages 1969-1973
    Published: June 15, 1983
    Released on J-STAGE: May 29, 2007
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    Shifts or He II spectral lines were measured, defining the c.g. or unperturbed fine-structure components having statistical intensity distribution as the origin of shift. The Stark-shift of He II λ4686A (n=3←n′=4) is described in detail; the Stark-shift was found to depend on electron temperature, electron density and pressure of the plasma. Some discussion about the plasma-shift of the He II Lyα λ304A (n=1←n′=2) is mentioned.
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  • Nemai Chand Dawn, S. K. Chakraborty
    1983 Volume 52 Issue 6 Pages 1974-1981
    Published: June 15, 1983
    Released on J-STAGE: June 01, 2007
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    The importance of spherical sources in the study of generation and propagation of waves in elastic media is well known [Jeffreys]. To make the situation more realistic, the randomness of generation has to be taken into account. In this connection, Ramakrishnan’s theory on stochastic integral representation based on a deterministic solution makes it possible to incorporate the randomness into the picture.
    In this paper, two cases of excitation have been treated. The random pulses give rise to stochastic integrals for the displacement and stresses from which the mean of the displacement and stresses and the mean square value of displacement from the auto-correlation function, have been calculated. The expectation for displacement in the two cases and the mean square displacement in one case, have been numerically evaluated.
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  • Mitsuaki Funakoshi, Masayuki Oikawa
    1983 Volume 52 Issue 6 Pages 1982-1995
    Published: June 15, 1983
    Released on J-STAGE: June 01, 2007
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    The long-short wave interactions between an internal gravity wave and a surface gravity wave packet in a two-layer fluid are investigated. When the phase speed of the internal wave coincides with the group velocity of the surface wave packet, a strong interaction occurs. The equations describing this interaction are derived both for a shallow (in comparison with a length scale of the long wave) fluid layer and for a deep one, and are studied numerically.
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  • Hidenori Hasimoto, Moon-Uhn Kim, Takeshi Miyazaki
    1983 Volume 52 Issue 6 Pages 1996-2003
    Published: June 15, 1983
    Released on J-STAGE: June 01, 2007
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    The Stokes flow due to the motion of a small spherical particle translating in arbitrary directions is investigated, in the presence of a semi-infinite plane. The solutions of the boundary value problem are obtained in closed forms to the point force approximation, by the use of the Green and Neumann functions supplemented by the edge function to remove the singularity at the edge of the plate. The force and the torque (or angular velocity) experienced by the particle are determined on the basis of this solution, with special reference to the side-force.
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  • Ken-iti Munakata
    1983 Volume 52 Issue 6 Pages 2004-2015
    Published: June 15, 1983
    Released on J-STAGE: June 01, 2007
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    The stability of fluid flow in a circular pipe to infinitesimal disturbances is investigated by making use of a method of eigenfunction expansion, taking into account the three-dimensional variation of disturbance velocities. It is shown by numerical computations that the Poiseuille flow becomes unstable beyond a critical Reynolds number which depends on azimuthal wave numbers considered. The minimum critical Reynolds number corresponds to the rotationally symmetric spiral mode of oscillations and it is found to be 1320 when use is made of twenty coordinate functions. Non-symmetric disturbances become growing for the Reynolds numbers larger than 8600. Discussions are made concerning the physical reasonings of discrepancy with the results of previous investigations according to which the Poiseuille flow has been considered to be stable to small disturbances.
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  • Shobu Kaneko, Katsuji Chiyoda, Isao Hirota
    1983 Volume 52 Issue 6 Pages 2016-2024
    Published: June 15, 1983
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    The Grad-Shafranov equations for an oblate and a prolate spheroidal plasmas are solved analytically under the assumptions, B\varphi=0 and dp⁄dψ=constant. Here B\varphi is the toroidal magnetic field, p is the kinetic pressure, and ψ is the magnetic flux function. The plasmas in magnetohydrodynamic equilibrium are shown to be toroidal. The equilibrium magnetic-field configurations outside the spheroidal plasmas are considerably different from that of a spherical plasma. A line cusp or two point cusps appear outside the oblate or the prolate spheroidal plasma, respectively.
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  • Toshihiko Dote, Masatoshi Shimada
    1983 Volume 52 Issue 6 Pages 2025-2034
    Published: June 15, 1983
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    The electrophoresis phenomenon in a cylindrical positive column has been theoretically investigated. An extensive improvement on the theory has been made from the view point of the momentum transmitted to neutral particles from charged particles on the basis of the quasi-neutral theory of the positive column recently presented by the authors. According to this, several fresh results, for example, a general expression for the pressure gradient along the axis, and dependence of the pressure gradient on the pressure and the tube radius have been obtained. In addition, a comparison between calculated and experimental characteristics has verified the diffusion cooling for positive ions predicted by the authors before.
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  • Masayoshi Taguchi
    1983 Volume 52 Issue 6 Pages 2035-2040
    Published: June 15, 1983
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    The wave-induced current in a toroidal magnetic field is computed by use of an adjoint drift-kinetic equation for electrons. The inverse aspect ratio of the toroidal device is assumed to be small and the lowest-order terms of this ratio are retained. As the wave-absorption mechanism, the electron cyclotron damping and the electron Landau damping are considered. It is found that the induced current decreases considerably by the effect of the trapped electrons when the phase velocity of the plasma wave is low.
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  • Hiroshi Oshiyama, Sadao Masamune
    1983 Volume 52 Issue 6 Pages 2041-2045
    Published: June 15, 1983
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    Transverse diffusion coefficient in a toroidal reversed field pinch (RFP) is investigated for the MHD region. The configuration of the RFP is characterized by both a poloidal magnetic field Bω and a longitudinal field Bφ which reverses on the outside of the plasma with respect to its value on the axis.
    Owing to the value of Bω being comparable to Bφ and the short connection length of the magnetic lines of force, the diffusion coefficient in the toroidal RFP does not considerably exceed the so-called classical diffusion of binary collision, D=nTe⁄σB02 where Te is the electron temperature, n is the plasma density and σ is the transverse conductivity of the plasma.
    Near the characteristic magnetic surface in the RFP, where Bφ=0, the field Bω makes a dominant role for determining the diffusion coefficient which results in the order of D=nTe⁄σBω3.
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  • Minoru Tanaka
    1983 Volume 52 Issue 6 Pages 2046-2052
    Published: June 15, 1983
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    The isosceles triplet distribution functions g(3)(s, r, r) and g(3)(s, s, r) with s fixed at values corresponding to the peaks of the pair distribution function are calculated in the rapidly quenched states of a simple liquid metal simulated by the molecular dynamics method. At lower temperatures these functions show characteristic features of the short-range order in amorphous states, i.e. an icosahedral packing of the first-shell and a dual structure of the second-shell around an arbitrary atom. The distribution of near-bond angles and that of other particles on the bisecting plane of near-bonds in the final amorphous state are compared with f.c.c. and b.c.c. microcrystalline models, and it is shown that the cuboctahedral configuration is suppressed very much in the amorphous state.
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  • Vladimír Dvorák, Václav Janovec, Yoshihiro Ishiba ...
    1983 Volume 52 Issue 6 Pages 2053-2061
    Published: June 15, 1983
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    It is shown how the symmetry of macroscopic properties of an infinite perfect incommensurate structure can be determined. The procedure is based on the fact that macroscopic properties do not depend on positions of incommensurate waves with non-parallel wavevectors k but do depend on relative positions of incommensurate waves with parallel k. Examples arc discussed in which the symmetry of macroscopic properties is or is not reduced at the parent-incommensurate phase transition. Experimental indications of some effects forbidden by theoretical predictions are attributed to pinning and distortions of modulation waves in real samples.
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  • Shin’ichi Takeda, Shigeru Tamaki, Yoshio Waseda
    1983 Volume 52 Issue 6 Pages 2062-2071
    Published: June 15, 1983
    Released on J-STAGE: May 29, 2007
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    An X-ray diffraction study of liquid Ga–Te alloys has been carried out to reveal their structural characteristics. The results strongly indicate that the structural features of liquid Ga–Te alloys can be given by the short range order based on the chemical-bonding nature rather than the so-called simple random mixture of constituents. A feasible model explaining their particular structural features has been demonstrated by using the defected-zinc-blend type ordering units of solid Ga2Te3. The temperature dependence of these characteristic feature has also been discussed in terms of the partial dissociation of the chemical-bonding nature with increasing of temperature.
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  • Takeshi Kambara, Fumio Ogata, Naoyuki Sasaki, Kenichiro Gondaira
    1983 Volume 52 Issue 6 Pages 2072-2080
    Published: June 15, 1983
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    A microscopic model is presented to provide a qualitative basis for understanding the (Remark: Graphics omitted.) transition accompanying molecular distortions induced by the electron transfer in hemoproteins. The coupling of iron ions with the intramolecular distortions and the intermolecular coupling between the molecular distortions are the driving force of the (Remark: Graphics omitted.) transitions in the present model where the electron number of the system is varied as an external parameter. It is shown that the various types of the (Remark: Graphics omitted.) transitions such as continuous or discontinuous and with or without the molecular distortions may occur with changing the number of electrons.
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  • Makoto Ueda, Huzio Nakano
    1983 Volume 52 Issue 6 Pages 2081-2087
    Published: June 15, 1983
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    Spatially modulated structures in the Ising model on the fcc lattice with anisotropic nearest-neighbour and next-nearest-neighbour interactions are investigated, to compare with the long period superlattice (LPS) structure of CuAuII appearing in Cu–Au alloy. The free energy is calculated as a function of the order parameter for each of relevant structures, by making use of the method of symmetry-breaking field. Thus, it is shown that commensurate and incommensurate phases as well as homogeneous or normal ordered phases are stabilized, depending on the temperature and the interaction coupling ratios. Effects of higher harmonics are also taken into account and found to be small, although they have not to be neglected. It is noted that the anisotropy in the couplings causes the LPS structure to be stabilized.
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  • Ikuo Suzuki, Yoshihiro Ishibashi
    1983 Volume 52 Issue 6 Pages 2088-2092
    Published: June 15, 1983
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    A model free energy of antiferroelectric phase transitions, written in terms of two parameters, i.e., the total and the staggered polarizations, is analysed to find the tricritical and tetracritical points in the electric field-temperature phase diagrams. The conditions required for the appearance of such multicritical points are derived.
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  • Yukio Tanaka, Norio Ohtomo, Kiyoshi Arakawa
    1983 Volume 52 Issue 6 Pages 2093-2101
    Published: June 15, 1983
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    A statistical mechanical calculation of liquid alkali alloys (Na–Rb, Na–Cs, K–Rb, K–Cs and Rb–Cs) is performed by using the generalized van der Waals theory associated with a uniform background potential of V−1⁄3-dependence (V: volume). Excess thermodynamic functions, structure factors and concentration fluctuations are calculated and discussed. Negatively large excess volume and small excess entropy characteristic of liquid alkali alloys are reasonably explained. It is found that a marked increase in the concentration fluctuation of Na–Cs alloys is primarily determined by the difference in sizes of constituent ions.
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  • Akira Fukizawa, Yuh Fukai
    1983 Volume 52 Issue 6 Pages 2102-2107
    Published: June 15, 1983
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    The effect of pressure on the crystal structure and lattice parameter of VH0.5 and NbH0.75 has been investigated at room temperature by using a diamond-anvil cell up to the pressure of 60 GPa.
    It was found that the volume increase due to hydrogen, ΔvH, is practically incompressible, and that NbH0.75 transforms at about 20 GPa into a bct structure isomorphous with β-VH0.5.
    The invariance of ΔvH under pressure is examined in the more general context of the apparent invariance of ΔvH in any host metals, and a tentative explanation for it in terms of local electronic states is proposed.
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  • Kenn Kubo, Satoshi Takada
    1983 Volume 52 Issue 6 Pages 2108-2117
    Published: June 15, 1983
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    The idealized bipolaron model proposed by Alexandrov and Ranninger is studied within the molecular field and the random phase approximations. It is shown that the incommensurate charge density wave (CDW) appears in the presence of the second neighbor interaction. Its period is determined both by the ratio of the interaction constants and by the number of bipolarons. The phase diagrams are shown to consist of four phases, i.e., the normal, the superconductive, the normal CDW and the condensed CDW (CCDW) where the ODLRO coexists with the DLRO. The lowest excitation mode is shown to have the phonon-like spectrum in both the superconductive and the CCDW phases. The CCDW phase, therefore, is expected to be superconductive contrary to the results by Alexandrov and Ranninger.
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  • Kenji Hiruma, Noboru Miura
    1983 Volume 52 Issue 6 Pages 2118-2127
    Published: June 15, 1983
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    Shubnikov-de Haas effect in magnetoresistance was investigated in Bi and Bi100−xSbx alloys with various x ranging from 0.1 to 12.2 (atomic percent) under pulsed high magnetic fields up to 45 T. For H⁄⁄binary, sharp kinks corresponding to the magnetic-field-induced semimetal to semiconductor (SM–SC) transition were observed for x=4.4 in addition to the Shubnikov-de Haas peaks of holes. In pure Bi, SM–SC transition was observed for H⁄⁄binary at 88 T in the magneto-transmission of the far-infrared radiation. For x>8, on the other hand, semiconductor to semimetal (SC–SM) transition was observed for H⁄⁄trigonal. In Bi and Bi95.6Sb4.4 for H⁄⁄binary, band parameters were determined based on the Vecchi et al.’s model, by analysing the Shubnikov-de Haas oscillation and SM–SC transition field.
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  • Jun’ichiro Hara, Hidetoshi Fukuyama
    1983 Volume 52 Issue 6 Pages 2128-2139
    Published: June 15, 1983
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    Simple descriptions in terms of the phase variables are made for various types of solitons in dimerized and trimerized states of one-dimensional interacting electron system in the continuum limit. Effect of mutual interactions between electrons on such characteristics of a soliton as the formation energy, the charge and spin distributions, and the lattice displacement pattern are examined in the classical approximation.
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  • Göran Niklasson, Alf Sjölander, Fukuo Yoshida
    1983 Volume 52 Issue 6 Pages 2140-2147
    Published: June 15, 1983
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    The effect of single particle damping on S(q, ω) for the homogeneous electron liquid is examined and clarified. A dip in S(q, ω) is found to be caused by a rapid increase in the damping when the electron involved is able to emit a plasmon. This explains quite well experimental results from inelastic X-ray scattering.
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  • Yuichi Akahama, Shoichi Endo, Shin-ichiro Narita
    1983 Volume 52 Issue 6 Pages 2148-2155
    Published: June 15, 1983
    Released on J-STAGE: May 29, 2007
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    Large single crystals of black phosphorus have been grown under high pressure, and by using the crystals, the Hall measurements have been done in a range from 4.2 K to 550 K. All the undoped samples have exhibited p-type conduction, while we have succeeded in obtaining n-type crystals by doping Te impurity. The effective acceptor concentrations NA–ND of the p-type samples and those of donor in n-type samples ND–NA have been in the range of 2∼5×1015 cm−3 and 2∼3×1016 cm−3, respectively. From the intrinsic range of the conductivity, the energy gap has been estimated to be 0.335 eV, The acceptor and donor activation energies have been determined to be ∼18 meV and ∼39 meV, respectively. The Hall mobility of the hole reaches its maximum of 6.5×104 cm2/V·sec around 20 K. The anisotropies of the conductivity and the mobility along the three crystal axes have been investigated.
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  • Shinichi Katsuki, Hiroshi Taketa, Misako Inokuchi
    1983 Volume 52 Issue 6 Pages 2156-2163
    Published: June 15, 1983
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    The model potential Xα method is applied to the electronic structure calculations for carbon monoxide on 3d transition metal surfaces to elucidate the effect of the substrate metals and the coadsorbed alkali metal atoms on the dissociative property of the adsorbate. From the results of the series calculations on MCO (M=Sc through Ni), Ni4(CO)2A, Ni3(CO)2A (A=Li, Na, K), the mechanism of the substrate-adsorbate interaction is analysed from the view-point of the π-back-donation. From the same angle are briefly viewed a blue-shift of the C–O stretching frequency at higher CO coverage and an increased O+ electron-stimulated-desorption yield for electron energies above the O1s threshold.
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  • Keiko Matsumura
    1983 Volume 52 Issue 6 Pages 2164-2172
    Published: June 15, 1983
    Released on J-STAGE: May 29, 2007
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    The possibility of hydrogen chemisorption onto anion vacancies on the (001) surface, ⟨110⟩ edge and ⟨111⟩ corner of LiF cluster is investigated with MBP CNDO MO. The clusters with an anion vacancy capture an electron to be localized at the vacancy and a singly occupied level (SOMO) of F-center character appears in the band gap. An approaching hydrogen atom can be bound tightly as sn H substitute at each charged vacant site. The strong binding is caused by the overlap between H 1s orbital χs(H) and SOMO and adsorption energy depends on the number of cations nearest to the vacancy.
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  • Kenji Takanaka
    1983 Volume 52 Issue 6 Pages 2173-2180
    Published: June 15, 1983
    Released on J-STAGE: June 01, 2007
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    The upper critical field Hc2 is calculated in the dirty limit for layered superconductors whose Fermi surface is assumed to consist of two distinct types. While the upper critical field perpendicular to the layer has the same temperature dependence as that for the bulk isotropic dirty superconductors, Hc2 parallel to the layer is found to have a positive curvature in the temperature dependence and to be finite even if there is no Pauli paramagnetism.
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  • Kazushige Machida
    1983 Volume 52 Issue 6 Pages 2181-2188
    Published: June 15, 1983
    Released on J-STAGE: June 01, 2007
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    The coexistence problem of ferromagnetism and superconductivity is further discussed theoretically, extending the idea that the spatially inhomogenous superconducting state with a non-vanishing pairing momentum is stabilized. A Ginzburg-Landau type phenomenological approach based on this idea is shown to adequately describe the temperature dependence of the satellite intensity including the hysteresis behavior observed in neutron experiment on the ferromagnetic superconductor ErRh4B4.
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  • Kazuhiko Yamashita
    1983 Volume 52 Issue 6 Pages 2189-2191
    Published: June 15, 1983
    Released on J-STAGE: June 01, 2007
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    The boson transformation method for the superconducting system consisting of two kinds of metals joined together by layered insulators is formulated in order to confirm the previous results for maximum dc Josephson current in the asymmetrical thin thickness junction. When the thicknesses of two kinds of metals are small compared with the London penetration depth, the system is identified with the uniform system with the effective London penetration depth and the effective boson characteristic function.
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  • Tsutomu Murasaki, Yoshiaki Tanaka, Norikiyo Uryû
    1983 Volume 52 Issue 6 Pages 2192-2201
    Published: June 15, 1983
    Released on J-STAGE: June 01, 2007
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    The new approximation methods are applied to the analyses of the magnetic susceptibilities of the alternatingly spaced Heisenberg chain and the ladder-like systems of spin one-half. The magnetic susceptibility of antiferromagnetic compounds Cu-HTS and Cu-OTS which are recently found good examples of the alternating Heisenberg linear chains has been analyzed by the use of (q+1)-approximation and the exchange coupling parameters have been estimated. As an example of antiferromagnetic compounds having ladder-like structure, hydrazinium copper (II) chloride has been taken up and the pair-approximation is applied for the analysis of its magnetic susceptibility. Both approximations have proved to be quite effectual and expedient method to analyze the magnetic properties of low-dimensional spin systems.
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  • Kimio Adachi, Kazuyoshi Takeda, Fumitaka Matsubara, Mamoru Mekata, Tai ...
    1983 Volume 52 Issue 6 Pages 2202-2209
    Published: June 15, 1983
    Released on J-STAGE: June 01, 2007
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    Specific heat of quasi-one-dimensional RbFeBr3 has been measured in the temperature range 1.1∼10 K in applied magnetic fields. Two anomalies with slight field dependences have been found at TN=5.61±0.02 K and Tt=2.00±0.04 K in zero field. Below 120 K, the spin frustration is partially released by a lattice distorsion. Analysis by molecular field approximation for magnetic ordering process in the triangular spin (S=1) system with frustration partially relased by lattice modulation is presented. The partial release of the frustration enables us to predict from the analysis that the high temperature anomaly corresponds to the transition from paramagnetic phase with mutually uncorrelated magnetic chains to a partially disordered phase in which one third of magnetic chains remains uncorrelated with the others and the low temperature one to the transition from the partially disorded phase to the triangular phase in the c-plane.
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  • Masakazu Nishi, Yuji Ito, Satoru Funahashi
    1983 Volume 52 Issue 6 Pages 2210-2215
    Published: June 15, 1983
    Released on J-STAGE: May 29, 2007
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    Inelastic neutron scattering has been used to study the magnetic excitation spectrum of KFeS2—a spin analogue of the oxidized two iron ferredoxins–in the antiferromagnetically ordered state. The observed spin wave dispersion relations along a*, b*, c* directions at 77 K are analyzed to give the nearest neighbor intra-chain exchange constant J1=−168.1±4.8 cm−1 (−20.84±0.60 meV), and the ratio of the nearest interchain to the intra-chain interaction |J3|⁄|J1|=8.6×10−3 indicative of the strong covalency and of the one-dimensional character of the interaction. The anisotropy field of 6040±91 Oe obtained from the gap at the zone center results mostly from the non-dipolar energy. A contribution of quartic terms of spins in the anisotropy energy is needed to account for the observed easy spin direction.
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  • Hiroaki Aoki, Masanori Arakawa, Taturu Yosida
    1983 Volume 52 Issue 6 Pages 2216-2220
    Published: June 15, 1983
    Released on J-STAGE: May 29, 2007
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    ENDOR measurements have been made in CsCaF3: Mn2+ to investigate the unpaired spin densities on the nearest neighbour fluorine tons (F1) in relation to the hyperfine (hf) interactions with the second neighbour fluorine (F2) nuclei. From the ENDOR spectra of F1, it has been obtained that fs=0.45% and fσfπ=0.87% where fs,fσ and fπ are unpaired spin fractions in the 2s, 2pσ and 2pπ orbitals on F1, respectively. For F2 the trace of the hf tensor a is 0.042 MHz. The result confirms the tendency that the value of tr a for Mn2+ and Fe3+ centres in perovskite fluorides is small when the outermost shell of the host divalent cation is not d orbitals.
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  • Mitsumasa Ishiwata
    1983 Volume 52 Issue 6 Pages 2221-2230
    Published: June 15, 1983
    Released on J-STAGE: May 29, 2007
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    The longitudinal relaxation of individual resonance lines in an AX spin system in dichloroacetaldehyde was observed by the saturation-recovery method under double resonance. A second radio-frequency field continuously stirred either of two lines of the proton different from the one to which the observed line belonged. This stirring field was not too strong to result in any appreciable splitting of the observed line. It was found that the recovery from saturation could be accelerated by the stirring field when the stirred line was progressively connected to the observed. The acceleration occurred only for an appropriate range of the amplitude of the stirring field. A brief account of this phenomenon is given in terms of a nutational motion of the stirred spin.
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