Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
Volume 52, Issue 11
Displaying 1-47 of 47 articles from this issue
  • Sadao Masamune, Hiroyuki Okada, Hiroshi Nishihara
    1983 Volume 52 Issue 11 Pages 3693-3696
    Published: November 15, 1983
    Released on J-STAGE: June 01, 2007
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    A neutral hydrogen beam has been used for determining the effective ion charge Zeff and the proton density of the NOVA II tokamak plasma. In the hydrogen plasma, the Zeff was close to 1, and the proton density was found to be nearly equal to the electron density. In the hydrogen plasma with an injection of a considerable amount of methane gas, the Zeff determined by the neutral beam probe and by the plasma conductivity showed good agreement around the value of 2. The time behavior of the densities of protons and carbons indicates that the effective confinement time for carbon may be a little shorter than that for hydrogen.
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  • Kazutoshi Gouhara, Ying Hao Li, Norio Kato
    1983 Volume 52 Issue 11 Pages 3697-3699
    Published: November 15, 1983
    Released on J-STAGE: May 29, 2007
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    The intermediate phase (IP) between α and β phases of quartz, which has been reported previously by the present authors, was studied by a fine-beam X-ray Laue method. Then, one could find satellite reflections. The analysis shows that IP has a sinusoidal and displacive modulated structure which is characterized by 6 wave vectors q perpendicular to the a axes. The wave is transversal in the C-plane. The period Λ=q−1 of the modulation and the associated intensities increase as temperature decreases; i.e. Λ=172±10 Å on β side and 565±25 Å on α side. The satellites are likely owing to the optical mode of the displacive vibration of SiO4 tetrahedra.
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  • Hikaru Terauchi, Satoshi Iida, Kazuhiro Tanabe, Kenji Kikukawa, Hirono ...
    1983 Volume 52 Issue 11 Pages 3700-3702
    Published: November 15, 1983
    Released on J-STAGE: June 01, 2007
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    From the EXAFS and the X-ray absorption near edge structure (XANES) studies of Wolffram’s red salt, the locally distorted structure of the linear chain is determined and the mixed valencies of Pt ions are directly confirmed.
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  • Morikazu Toda, Noriko Saitoh
    1983 Volume 52 Issue 11 Pages 3703-3705
    Published: November 15, 1983
    Released on J-STAGE: June 01, 2007
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    The classical specific heat of the exponential lattice at constant length is derived and its asymptotic behaviours are studied.
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  • Yoshiro Sasaki, Kunihiro Hoshi, Satoshi Saito, Kunihiko Yamaguchi, Yui ...
    1983 Volume 52 Issue 11 Pages 3706-3709
    Published: November 15, 1983
    Released on J-STAGE: June 01, 2007
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    Optical absorption spectra of layered compound GaS are measured near the indirect edge under uniaxial pressure parallel to the c-axis (perpendicular to the layer) at 4.2 K. The deduced values of the deformation potential for the indirect edge are Di=−8.0±2.5 eV and D⁄⁄i=−2.3±0.4 eV for the strain perpendicular and parallel to the c-axis, respectively. The sign and anisotropy of the deformation potentials obtained here are discussed on the basis of the band model characteristic of layered materials, where the competition between interlayer and intralayer interactions determines the pressure dependence of their band gaps.
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  • Mitita Goto, Tatsuo Kamimori
    1983 Volume 52 Issue 11 Pages 3710-3712
    Published: November 15, 1983
    Released on J-STAGE: May 29, 2007
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    Magnetocrystalline anisotropy constant K1 of Fe1−xSix (0.08≤x≤0.25) in both as-quenched and after-annealed samples was determined from torque measurements in 77∼300 K, in order to make clear the difference in K1 between disorder and order phase (D03 type) of Fe3Si at x=0.25. The difference in K1 between both the cases began to appear at x\simeq0.17, and values of K1 for x=0.25 were determined to be −1.01× and 0.94×105 erg/cm3 at 77 K in the as-quenched and the after-annealed, respectively. This difference in K1 was apparently due to the one in the degree of order in D03; the former value was thought to be of nearly perfect disorder in long range and the latter of perfect order. In any case, it was concluded that K1 of Fe3Si is negative in disorder and positive in order (D03).
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  • Akira Nakamura
    1983 Volume 52 Issue 11 Pages 3713-3721
    Published: November 15, 1983
    Released on J-STAGE: June 01, 2007
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    We have found new exact solutions of the coupled nonlinear Schroedinger equation of Benney-Roskes which is written as iut−βuxxuyyu*uu−2wu=0, βwxxwyy−βδ(u*u)xx=0. Three types of new solutions have been obtained. They are described by the Hermite polynomials, the Bessel function of order ±1⁄4 and ±1⁄3 (Airy function). Physically these solutions represent exploding and decaying solitons.
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  • Masayoshi Tajiri
    1983 Volume 52 Issue 11 Pages 3722-3726
    Published: November 15, 1983
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    The soliton solutions of the nonlinear Klein-Gordon and coupled nonlinear Klein-Gordon equations, uttuxx+mur|u|2u=0 and uttuxx+mur|u|2u−2vu=0, vtt+vxx+r|u|2xx=0, are analysed to see a relation between the character of soliton solutions and the Painlevé property. It is also shown that the coupled nonlinear Klein-Gordon equation has the two-soliton resonant interaction solution.
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  • Masayoshi Tajiri, Mari Hagiwara
    1983 Volume 52 Issue 11 Pages 3727-3734
    Published: November 15, 1983
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    It is shown that the two-dimensional coupled nonlinear Schrödinger equation is reduced first to the coupled Klein-Gordon, one-dimensional nonlinear Schrödinger equation and others, and secondly to the second Painlevé equation and others by similarity transformations. The similar-type soliton solutions of the equation are obtained.
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  • Mamoru Yamashita
    1983 Volume 52 Issue 11 Pages 3735-3742
    Published: November 15, 1983
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    Chiral smectic C liquid crystal of planar geometry put between two glass plates shows a structure with double of vortex streets. The order parameter characterizing the chiral smectic C phase satisfies an equation similar to the Ginzburg-Pitaevskii equation for liquid helium and its spatial variation is studied. A pitch of smectic C phase is inversely proportional to density of pairs of vortex and anti-vortex, and increases with decreasing plate-separation as a result of competition between chirality of the material and the strain energy due to vortex streets produced by the boundaries. The competition effect leads to the decrease of the transition temperature between smectic A and chiral smectic C phases in agreement with the experimental results.
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  • Hachiro Niizeki, Tsutomu Tamura
    1983 Volume 52 Issue 11 Pages 3743-3747
    Published: November 15, 1983
    Released on J-STAGE: May 29, 2007
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    The decay scheme of 95Y to 95Zr has been studied with Ge(Li) and anthracene spectrometers. The beta branchings to the ground state and the 18 excited states of 95Zr were determined reliably. Properties of the 95Zr levels excited by unhindered allowed transitions are discussed.
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  • Keiichi Shibata, Shoji Shirato
    1983 Volume 52 Issue 11 Pages 3748-3758
    Published: November 15, 1983
    Released on J-STAGE: June 01, 2007
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    The differential cross sections for the reactions 9Be(n, α0)6He(g.s.) and 9Be(n, α1)6He* and the α-α particle-correlation spectrum from the 9Be(n, αα)nn reaction have been measured using 14.1 MeV neutrons. The measured angular distributions of α-particles were in good agreement with those of Perroud and Sellem at 13.99 MeV, and were compared with DWBA calculations. The spectroscopic factors for the cluster transfer reactions on 9Be have been deduced. The observed correlation spectrum implies that this four-body breakup reaction is dominated by a sequential decay process in the measured α-particle energy region. The second and third excited states in 6He have been confirmed to be located at around 3.4 MeV and 6.0 MeV, respectively.
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  • Shoji Takagi, Shunsuke Ohtani, Kiyoshi Kadota, Junji Fujita
    1983 Volume 52 Issue 11 Pages 3759-3765
    Published: November 15, 1983
    Released on J-STAGE: May 29, 2007
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    Cross sections for one-electron capture by highly stripped ions of Be, B and C from H2 and Ar are measured at low energies below 10 keV. The cross sections are nearly independent of the collision energy investigated. The distinct oscillation with incident ionic charge q in the cross sections are observed.
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  • Keizo Nakagawa, Hidenori Takeda, Takuya Matsuda
    1983 Volume 52 Issue 11 Pages 3766-3772
    Published: November 15, 1983
    Released on J-STAGE: June 01, 2007
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    An analytic solution of non-axisymmetric flow in a rotating cylinder with a sloping bottom and a flat top, which is rotating slightly farster than the other walls, is obtained for compressible fluid, and is compared with the imcompressible counterpart considered by Pedlosky and Greenspan. In the incompressible fluid the flow field is z-independent due to Taylor-Proudman theorem, and the phenomenon so called westward intensification is observed. In the compressible case, on the other hand, horizontal flow lines are circular, while non-axisymmetric weak z-motion is induced by the bottom slope.
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  • Masahiro Nakagawa, Tadashi Akahane
    1983 Volume 52 Issue 11 Pages 3773-3781
    Published: November 15, 1983
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    An electrohydrodynamic instability in homeotropically aligned nematic samples with positive dielectric anisotropy is presented. The analogy between the present instability and the thermally induced instabilities is found in experiments. It is pointed out that the effects of the charge injection due to the thermionic omission process and of the diffusion current must be taken into account to explain the presently observed new domains.
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  • Masahiro Nakagawa, Tadashi Akahane
    1983 Volume 52 Issue 11 Pages 3782-3789
    Published: November 15, 1983
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    A new type of electrohydrodynamic instability previously found is theoretically studied. It is found that the presently observed instability is closely related to the Felici or Bénard type of instability but not to the Carr-Helfrich one. The present study shows the importance of the carrier injection from the electrodes to explain the cellular domain formation under a DC electric field.
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  • Moon-Uhn Kim
    1983 Volume 52 Issue 11 Pages 3790-3799
    Published: November 15, 1983
    Released on J-STAGE: June 01, 2007
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    The Stokes flow due to the motion of a small sphere translating in arbitrary directions is investigated in the presence of a salient wedge. Formal solutions of the boundary value problem are obtained on the basis of the point force approximation. The force and the torque experienced by the sphere are determined by evaluating the formal expressions.
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  • Makoto Okamura, Takuji Kawahara
    1983 Volume 52 Issue 11 Pages 3800-3806
    Published: November 15, 1983
    Released on J-STAGE: June 01, 2007
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    The Hopf-Cole transformation is used to obtain a steady solution of the forced Burgers equation when the driving force is a sinusoid. A reduced linear equation of damped Mathieu type is solved numerically by a Fourier expansion method. It is found that steady solutions exist for arbitrary values of the viscosity and the forcing. Whether the waveform is smooth or a shock appears depends on the relative magnitudes of the viscosity and the forcing. Comparisons are made with analytical solutions in some limiting cases and also with matched solutions.
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  • Kanemitsu Katou
    1983 Volume 52 Issue 11 Pages 3807-3812
    Published: November 15, 1983
    Released on J-STAGE: May 29, 2007
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    A nonlinear analysis of the dynamic behavior of dissipative drift-waves is developed. Near the neutral stable point, the time-dependent Ginzburg-Landau equation with complex coefficients is derived from the two-fluid equations which describe the dissipative drift-waves, by means of reductive perturbation. The convective cell excited by the nonlinear self-interaction of a linearly stable drift-wave is undamped and is adiabatically enslaved by the drift-wave. The system composed of the drift-wave and convective cell self-organizes as the external magnetic field exceeds a certain critical value and tends asymptotically to a stable nonequilibrium state (nonlinear saturation). The saturation level of a single, linearly unstable drift-wave in a non-isothermal plasma is obtained as a function of critical wavenumber, density gradient scale length, plasma temperature and magnetic field.
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  • Tatsuro Miyasato, Masao Tokumura
    1983 Volume 52 Issue 11 Pages 3813-3820
    Published: November 15, 1983
    Released on J-STAGE: June 01, 2007
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    Magnetic field effect on the acoustic attenuation at 0.83 and 3.35 GHz in 0.45 and 1.7×1016 Sb/cm3 doped Ge was measured in the [001] magnetic field up to 60 kG at liquid He temperatures. The experimental results are summarized as follows: (1) The attenuation decreases with the field and shows a minimum at 27 kG and then increases. (2) The position of the minimum point is nearly independent of the donor concentration, the temperature, and the frequency. (3) The magnitude of the effect shows a sub-linear dependence on the donor concentration. The experimental results were compared with a theoretical calculation based on the shrinkage effect of the donor wave function to the phonon scattering by the neutral donor electrons at the ground state. The theory explains the decrease of the attenuation at lower fields, but does not explain the anomalous increase at higher fields.
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  • Kazutoshi Gouhara, Ying Hao Li, Norio Kato
    1983 Volume 52 Issue 11 Pages 3821-3828
    Published: November 15, 1983
    Released on J-STAGE: May 29, 2007
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    By using high intensity X-ray generator (50 keV, 1200 mA) and TV imaging system, diffraction topographs of quartz in a range from room temperature up to 800°C were surveyed. The phase transition at Tc=573°C was studied with an emphasis on elucidating the intermediate region (IR) between α(low) and β(high) phases. The topographs show clearly the existence of IR within a range of 1∼2 degrees. It is a stable thermodynamical phase. The boundary energy of α and IR is appreciably larger than that of β and IR. Often, fringe-like contrasts appeared along c axis in IR, particularly under a relatively fast cooling. Neither micro twin model of α1 and α2 structures nor a mixture model of α and β are acceptable for IR. The structure is likely to have a six-fold symmetry as that of the β phase.
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  • Manabu Endo, Tsutomu Kaneko, Toshio Osaka, Yasuharu Makita
    1983 Volume 52 Issue 11 Pages 3829-3832
    Published: November 15, 1983
    Released on J-STAGE: May 29, 2007
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    The dielectric constants of K3H(SeO4)2 and its partially deuterated crystal were measured from 5 K to 400 K. It was found that K3H(SeO4)2 undergoes a phase transition accompanied with a small peak in the dielectric constant at about 20 K. The peak of the dielectric constant was shifted from 20 K to 73 K by deuteration of about 70%.
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  • Michio Midorikawa, Hiroshi Orihara, Yoshihiro Ishibashi, Tadaharu Mina ...
    1983 Volume 52 Issue 11 Pages 3833-3836
    Published: November 15, 1983
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    The space group of the low temperature phase of sodium azide NaN3 was confirmed to be a monoclinic C2h3. The distinct phase front could be seen by polarizing-microscopic observations at the trigonal-monoclinic transition, suggesting that the transition is of the first order. A drastic change in specimen dimension observed by dilatometric measurements supports the first order transition.
    On the basis of detected anomalies in strain the pressure-temperature phase diagram is produced in the range up to 250°C and 6 kbar.
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  • Katsukuni Yonashiro, Tomozo Tomoyose, Eijiro Sakai
    1983 Volume 52 Issue 11 Pages 3837-3844
    Published: November 15, 1983
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    The ionic conductivity and the thermoelectric power in superionic conductors are expressed as functions of the concentration of ions and the interaction energy in the framework of the lattice gas model. Under appropriate conditions, the results obtained are in good agreement with those of experiments.
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  • Yoshihiro Hamauzu, Fuminori Tamura, Akihiko Ooi
    1983 Volume 52 Issue 11 Pages 3845-3852
    Published: November 15, 1983
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    The propagation matrix method is applied to atom diffraction at solid surfaces. The basic equations for describing atom diffraction become the simultaneous linear differential equations for the propagation matrix. The diffraction intensity is expressed in terms of the propagation matrix. This method is applied to the calculation of intensity versus incident angle curves for the diffraction of helium beams from the lithium fluoride (001) plane. It is found that the unitarity of the scattering matrix is satisfied very well. Furthermore the dependence of the diffraction intensity on the surface lattice vibrations is investigated.
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  • Masahiro Inoue, Kazuo Ohtaka
    1983 Volume 52 Issue 11 Pages 3853-3864
    Published: November 15, 1983
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    An electromagnetic theory for the light absorption by a cluster of metal spheres and the Raman scattering by a molecule adsorbed on it is presented, which takes into account the retardation effect exactly and is applicable to an arbitrary cluster size. The theory is applied to a two-sphere cluster of Ag and Au. It is shown that the absorption spectrum is doubly peaked and the maximum enhancement factor of the Raman intensity amounts to 107∼108 when the distance between spheres is decreased. Absorption spectra of three- and four-sphere clusters are also calculated, which indicate that the essential features of the experimental observations are explained by the two-sphere cluster.
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  • Keiichiro Nasu
    1983 Volume 52 Issue 11 Pages 3865-3873
    Published: November 15, 1983
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    The phase diagram of a one-dimensional many-electron system with site-diagonal electron-phonon(e-p) coupling and short-ranged inter-site electron-electron(e-e) repulsion as well as intra-site one is studied within the mean field theory for electrons and in the adiabatic limit for phonons. The theory covers the whole region of four parameters characterizing the system: the transfer energy of electron T, the e-p coupling energy S, the intra- and inter-site e-e repulsive enegies U and V, and the phase diagram is given in a tetrahedral coordinate space spanned by T, U, S and V. It is proved that the “T-U-S-V tetrahedron” is divided into SDW and CDW regions by the interface U=S+2V, that is, “S” competes with “U” but cooperates with “V”. The “SU” and “ST” competitions appeared in the energy gap of CDW can explain the experimental results of halogen-bridged mixed-valence metal complexs.
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  • Hiroyoshi Suematsu, Ryusuke Nishitani, Ryozo Yoshizaki, Masatsugu Suzu ...
    1983 Volume 52 Issue 11 Pages 3874-3885
    Published: November 15, 1983
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    We have investigated the induced (M) and residual (Mr) magnetizations in the 2nd stage NiCl2-graphite intercalation compound at 4.2 to 300 K in the fields of 0.1 to 4.5×104 Oe with using the well-staged single crystal samples. Two successive magnetic phase transitions have been observed at Tc1=17.5 K and Tcu=22.0 K. Above Tcu the compound is paramagnetic with θ=70±1 K and μeff=3.29 μB. In the intermediate phase (Tc1<T<Tcu) the index δ in MHint1⁄δ has a remarkable temperature dependence from 1.0(T>Tcu) to 2.0(T<18.5 K) in the intermediate fields (1\lesssimHint\lesssim80 Oe) whereas it takes unity in the low fields (Hint\lesssim1 Oe). Mr measured in a weak cooling field Hc shows two stepwise decreases at temperatures immediately below Tc1 and Tcu, respectively, and Mr being finite in the intermediate phase. This two-step decrease of Mr has not been observed for Hc>10 Oe. These results suggest the existence of an ordered state at Hint<1 Oe in the intermediate phase. The critical behavior of χ(T) and δ(T) and the magnetic structure of the ordered state are also discussed.
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  • Fusayoshi J. Ohkawa
    1983 Volume 52 Issue 11 Pages 3886-3896
    Published: November 15, 1983
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    It is discussed that a competition between a formation of the singlet bound state at each site and an exchange interaction plays an important role in a periodic Anderson Hamiltonian with large Coulomb correlation. As the depth of f levels measured from the chemical potential is shallower, each f level site is more likely to behave independently; the depth is related with the number of f electrons per site (nf). Therefore the system can be classified into three regimes: i) The first one is the independent f level regime where nf is significantly less than one. ii) In the crossover regime where nf is nearly one, each f level site behaves independently at high temperatures. However a band-like coherent behavior, or magnetic orderings are expected at low temperatures. iii) In the RKKY regime where nf is very nearly one, magnetic orderings are expected at low temperatures.
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  • Fusayoshi J. Ohkawa
    1983 Volume 52 Issue 11 Pages 3897-3906
    Published: November 15, 1983
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    Ordered states of a periodic Anderson Hamiltonian with large Coulomb correlation and with orbital degeneracy of localized levels are theoretically investigated. When the number of f electrons is nearly one per site, and when the exchange interaction is antiferromagnetic as a whole, it is predicted that an antiferromagnetic type ordering occurs in the orbital order of localized levels at a certain low temperature accompanied by the lattice distortion due to the Jahn-Teller effect, and that a ferromagnetic or an antiferromagnetic ordering of spin, if it occurs, occurs at a lower temperature. One of the most characteristic features of this orbital ordered state is a strong coupling between orbital antiferromagnetic moments and spin ferromagnetic ones. It is tried to explain the experimental data of CeB6 with a model that a quartet is the ground multiplet of localized levels.
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  • Naoshi Suzuki
    1983 Volume 52 Issue 11 Pages 3907-3918
    Published: November 15, 1983
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    Magnetic properties of the triangular spin (TS) structure of hexagonal antiferromagnets with singlet-ground-state (SGS) character are studied on the basis of the dynamical correlated-effective-field approximation (DCEFA). How the SGS character is reflected in the magnetic excitation is investigated particularly in detail. In contrast with the usual spin wave theory which gives only one branch of the magnetic excitation the DCEFA predicts two branches, both of which are observable by inelastic neutron scattering measurements in case of strong SGS character. The magnetic excitations observed by Petitgrand et al. in the ordered state of RbFeCl3 are shown to be well understood within the TS structure model by using the DCEFA.
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  • Ko Kurosawa, Shozo Saito, Yasuo Yamaguchi
    1983 Volume 52 Issue 11 Pages 3919-3926
    Published: November 15, 1983
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    Neutron diffraction study on the layer compounds MnPS3 and FePS3 reveals a collinear antiferromagnetic order, respectively, below TN=78 K and 120 K with the corresponding wave vectors k=[000] and (Remark: Graphics omitted.), the magnetic moments pointing to the direction perpendicular to the layer planes for both cases. The intralayer exchange parameters between first (J1), second (J2) and third nearest neighbors (J3) are all antiferromagnetic for MnPS3, whereas for FePS3 J1 is ferromagnetic and J2 and J3 are antiferromagnetic, all of which have the same sign as those for the respective selenium compounds, but the absolute values are a bit larger in the sulfides than in the selenides.
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  • Kunihiko Morimoto, Kenji Shimomura, Makoto Yoshida
    1983 Volume 52 Issue 11 Pages 3927-3935
    Published: November 15, 1983
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    Temperature dependence of the 35Cl spin-lattice relaxation time T1 (5.85 and 3.5 MHz) and that of T in the rotating frame have been measured in ND4Cl and NH4Cl between 330 K and 77 K. The 90°-flip motion of ammonium ions is investigated in detail. The spin-lattice relaxation times of 35Cl may be interpreted to be a typical one governed by the reorientation of ammonium ions in the extremely asymmetric potential well.
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  • Kiyoshi Kawamura, Satoshi Kaneko, Takuro Tsuzuku
    1983 Volume 52 Issue 11 Pages 3936-3942
    Published: November 15, 1983
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    The conduction electron spin resonance of graphite has been investigated, using well defined near-ideal crystals and rather two-dimensional pyrolytic graphite specimens at temperatures between 100 K and 300 K. The effects of slight neutron irradiation on the former and of boronation on the latter were also examined. Experimental results were analyzed in accordance with the procedure developed by Feher and Kip. The g-shift data are compared with the band-theoretical calculations by McClure-Yafet and McClure; a decreasing trend with the depression of Fermi level as well as its temperature dependence is noted to be in connection with the spin-orbit splitting of the Landau level at the band degeneracy. The relaxation time is found to be a monotonously increasing function of temperature in qualitative agreement with the Elliott mechanism.
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  • Mitsumasa Ishiwata
    1983 Volume 52 Issue 11 Pages 3943-3952
    Published: November 15, 1983
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    Concrete equations of motion describing longitudinal relaxation of an AX system under irradiation of a selective rf field are worked out on the basis of Bloch’s density matrix theory. These equations are composed of thermal relaxation and coherent motion of the stirred spin, which determine dynamical characteristics of the spin system. Explicit equations of motion are obtained also for the magnetizations of another spin observed in the saturation-recovery experiment under double resonance. When the stirring field is not too strong to cause any appreciable splitting of the observed line, the recovery of the observed line can be described in terms of several exponential decay terms together with a pair of oscillating terms corresponding to the coherent nutation.
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  • K\={o}ki Takanashi, Hiroshi Yasuoka, Yutaka Ueda, K\={o}ji Kosuge
    1983 Volume 52 Issue 11 Pages 3953-3959
    Published: November 15, 1983
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    An extensive study of the 51V NMR in VO2 has been made between 4.2 K and 600 K, particularly laying stress on the analysis of the temperature dependence of the nuclear relaxation rate 1⁄T1. In the metallic (M) phase (T>Tt=340 K) an exchange-enhanced Korringa relaxation process for 1⁄T1 is observed and the spin fluctuation effects have been treated within RPA. In the insulating (I) phase (T<Tt), 1⁄T1(T) cannot be explained from a simple band model and it is proposed that the hopping motion of the self-trapped carriers or excitons are responsible for the relaxation process. The 51V NMR in the substitutional compounds, V1−xWxO2 (0≤x≤0.075), has also been studied in the M phase in order to obtain further knowledge to the M–I transition. From the RPA analysis, it is shown that the x-dependence of the experimental data are in general accord with the nesting model proposed by M. Gupta et al.
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  • Kiyoyasu Imai
    1983 Volume 52 Issue 11 Pages 3960-3965
    Published: November 15, 1983
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    The heat capacity measurements by the adiabatic method have shown the 2nd order character for the phase transitions of CsH2PO4 and CsD2PO4 with jumps, ΔCE=4.5±0.7 and 4.9±0.8 JK−1mol−1 respectively. In T>TC, the behavior of both of the heat capacities is so peculiar as to make our estimation of their lattice parts very difficult. Compared with the pseudo one-dimensional Ising theory, this behavior is interpreted in terms of the anomalously large polarization-fluctuations.
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  • Takeyo Tsukamoto, Masaru Komukae, Shigeru Suzuki, Hideo Futama, Yasuha ...
    1983 Volume 52 Issue 11 Pages 3966-3973
    Published: November 15, 1983
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    Domain structures of feroelectric RbHSeO4, which undergoes phase transitions at 102°C and 173°C, were observed and examined in the presence of either electric field or shear stresses, and the intensity of a laser beam deflected at domain walls was measured. In addition, dielectric and piezoelectric examinations were made above and below the 102°C transition.
    It was found that there are two types of domain structures observable at room temperature, i.e., the ferroelectric and simultaneously ferroelastic domain structure with the (001) domain walls and the ferroelastic one with the (100) domain walls. The former is observable below 102°C, while the latter is observable even above 102°C. The intensity of the light beam deflected at the (001) domain walls is observed to be proportional to the square of the spontaneous polarization.
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  • Manabu Endo, Toshio Osaka, Yasuharu Makita
    1983 Volume 52 Issue 11 Pages 3974-3977
    Published: November 15, 1983
    Released on J-STAGE: May 29, 2007
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    The dielectric, thermal and X-ray measurements of CsRbSeO4 were carried out. The crystal at room temperature belongs to the orthorhombic system with the symmetry mmm and the unit cell parameters: a=6.332 Å, b=10.853 Å, c=8.064 Å. The crystal becomes ferroelectric below about −39°C, the phase transition point, and has the spontaneous polarization of about 2.4 μC/cm2 along the c axis at −150°C. The crystal shows the stepwise anomalies in the dielectric constants along the a, b and c axes at the transition point. The transition entropy roughly estimated by means of differential scannig calorimetry gives the order of 0.01 cal·mol−1·deg−1. The crystals at room temperature are sometimes composed of domains with three kinds of crystal orientations which are mutually different by about 120°.
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  • Hiroshi Tanino, Koichi Kobayashi
    1983 Volume 52 Issue 11 Pages 3978-3984
    Published: November 15, 1983
    Released on J-STAGE: June 01, 2007
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    Absorption and reflection spectra of a crystal of chain compound palladium chloride are measured in the energy range of 1–11 eV at low temperature. The structures found in the spectra and their anisotropies are discussed by referring D2h molecular orbital states of d8 metal ion in rhombic planar ligand field.
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  • Yasuaki Masumoto, Shigeo Shionoya, Hiro Munekata, Hiroshi Kukimoto
    1983 Volume 52 Issue 11 Pages 3985-3991
    Published: November 15, 1983
    Released on J-STAGE: May 29, 2007
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    Photoluminescence of a-SixC1−x: H (x∼0.2) prepared by glow-discharge decomposition of tetramethylsilane is studied systematically in the picosecond time region by using tunable picosecond light pulses. At room temperature photo-generated electrons and holes are radiatively recombined at a rate of ∼5.5×108 s−1 and non-radiatively recombined competitively depending on the substrate temperature under the sample deposition. From the energy dependence of the lifetime of photo-generated electrons and holes, it is indicated that the optical matrix element of the radiative recombination transition is energy-independent. This fact and the quite fast radiative recombination rate are attributed to the geminate (i.e. exciton-like) radiative recombination mechanism of photo-generated electron-hole pairs which are well localized at the excited position.
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  • Hiromi Iwamoto, Ryumyo Onaka
    1983 Volume 52 Issue 11 Pages 3992-4000
    Published: November 15, 1983
    Released on J-STAGE: June 01, 2007
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    Magneto-optical properties of exciton multiplet bands in Cs halides are studied by measuring optical absorption and magnetic circular dichroism (MCD) spectra. It is found that among the five sharp exciton bands observed in the region near the fundamental absorption edge, the first, second and fourth bands have positive effective g-values and the other two bands negative. The magnetic circular dichroism is interpreted by considering the optically attainable exciton states arising from the configurations (t1u)5a1g and (t1u)5eg. The exciton states are calculated by use of an electron transfer model.
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  • Takashi Fujikawa
    1983 Volume 52 Issue 11 Pages 4001-4007
    Published: November 15, 1983
    Released on J-STAGE: June 01, 2007
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    The XANES spectra at a deep L2,3 (or M2,3) edge are discussed within the theoretical method previously developed by the authors. For the fixed samples in the space, the interference term between s- and d-waves emanating from the ionized atom appears. On the other hand the interference term disappears for the randomly oriented samples. The XANES function is derived where only the d-wave emanating from the central atom is taken into account. Applications to Si L2,3 XANES spectra in SiO2 and SiF4 are given.
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  • Xue Jin Jiang, Takayuki Hisamune, Yasuo Nozue, Takenari Goto
    1983 Volume 52 Issue 11 Pages 4008-4013
    Published: November 15, 1983
    Released on J-STAGE: May 29, 2007
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    Absorption and emission experiments have been performed on the I1deep bound exciton of the ZnSe crystal with and without magnetic field at temperatures lower than 4.2 K. The mean interacting LO-phonon number and the coupling constant ratio of the deformation type to the electro-static interactions are estimated to be 0.45 and 0.1, respectively. From the spin-flip Raman scattering, the g-factor is obtained as 2.0 which is close to that of the hole bound to the zinc vacancy. Some evidence is presented which suggests strong localization of the I1deep bound excitons.
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  • Hatsuo Nakamura, Kouichi Ichikawa, Takeshi Watanabe, Kenjiro Tsutsumi
    1983 Volume 52 Issue 11 Pages 4014-4018
    Published: November 15, 1983
    Released on J-STAGE: May 29, 2007
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    The valence and conduction bands of Ca and Sc metals have been studied by measuring their L2,3 emission and absorption spectra. It is found that the spectra exhibit the similar characteristic features. In both metals the emission peaks observed on the high energy side coincide with the absorption peaks in their energy position and for this reason the emission spectra of thick specimens obtained with high electron-beam energies are seriously affected by self-absorption. The spectra of Ca metal are compared with the calculated density of states and discussions are made on the emission peaks observed on the high energy side.
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  • Fumio Oosawa, Shigeru Hayashi
    1983 Volume 52 Issue 11 Pages 4019-4028
    Published: November 15, 1983
    Released on J-STAGE: June 01, 2007
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    The bacterial flagellar motor is driven by a flow of proton according to the electrochemical potential gradient across the membrane. For understanding efficient and smooth transformation of both electric and chemical potential energies of proton into a mechanical work, loose coupling has been assumed between the flow of protons and the rotation of the motor. In the mechanism proposed, two kinds of protein molecules arranged on a disc and on a ring surrounding the disc repeat fast and reversible reactions regulated by the binding of protons. Based on this mechanism, the relations of the torque generated in the motor and the flux of protons to the speed of rotation of the motor have been derived. The results of numerical calculations show reasonable agreement with most of the experimental results. Particular attention has been paid to the possibility of reverse transformation of free energy. It is expected that by rotating the motor in the reverse direction by an external force, the flux of protons is decreased and finally reversed; that is, protons may be pumped out against the potential gradient.
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  • Susumu Saito, Yukito Tanabe
    1983 Volume 52 Issue 11 Pages 4029
    Published: November 15, 1983
    Released on J-STAGE: May 29, 2007
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