Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
Volume 51, Issue 9
Displaying 1-50 of 61 articles from this issue
  • Kuniyuki Koyama, Norio Terata, Motohiro Matsuura
    1982 Volume 51 Issue 9 Pages 2697-2698
    Published: September 15, 1982
    Released on J-STAGE: June 01, 2007
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    The temperature dependences of subsystem susceptibilities in a sandwich type layer structure antiferromagnet, Mn(HCOO)2·2D2O are separately observed above TN by proton NMR in the external fields along the special directions determined by the dipole sum tensors. The susceptibility χA of A subsystem, which consists of Mn ions in the antiferromagnetically coupled planes, shows a broad maximum around 7 K (∼2TN). While χB, which is of the Mn ions mutually independent and sandwiched between the antiferromagnetic planes, follows the Curie’s law for S=5⁄2 and g=2.0.
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  • Hidenori Kubo, Yoshio Suzuki, Yoshihide Kimishima, Hironori Nishihara
    1982 Volume 51 Issue 9 Pages 2699-2700
    Published: September 15, 1982
    Released on J-STAGE: May 29, 2007
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    The spin structures in the magnetically ordered state are studied by Cu and Br NMR in the concentration region of 82%≤x≤97%. From the NMR spectra in zero applied field, the compound of x=82% is a ferromagnet with the moment direction parallel to the [110]-axis. In the region of 82%<x\lesssim97%, the moment direction inclines from the [110]-axis to the [001]-axis. The existence of the “oblique phase” is concluded. The weak lines suggest some distributions of the moment direction.
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  • Nobuyoshi Hosoito, Kenji Kawaguchi, Teruya Shinjo, Toshio Takada
    1982 Volume 51 Issue 9 Pages 2701-2702
    Published: September 15, 1982
    Released on J-STAGE: May 29, 2007
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    By UHV deposition we have prepared an artificially periodic film consisting of monatomic Fe layers and a few atomic Sb layers. Mössbauer spectroscopy showed that Fe atoms in the monatomic sheet are carrying no magnetic moment.
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  • Kenji Shimizu
    1982 Volume 51 Issue 9 Pages 2703-2704
    Published: September 15, 1982
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    The nuclear magnetic resonances of 159Tb, 163Dy and 167Er have been measured in magnetically ordered states of TbMn2, DyMn2 and ErMn2 intermetallic compounds, and the values of magnetic dipole and electric quadrupole hyperfine parameters have been determined.
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  • Shigehumi Onodera, Yoshikazu Ishikawa, Masayuki Shiga, Ze Xianyu, Yoji ...
    1982 Volume 51 Issue 9 Pages 2705-2706
    Published: September 15, 1982
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    The spin wave stiffness constant of a Laves phase invar compound (Zr0.7Nb0.3)Fe2 at low temperatures was estimated to be 350±50 meVA2 by inelastic neutron scattering experiment above room temperature. This value is significantly greater than the value (125 meVA2) of the spin wave stiffness constant deduced from the magnetization measurement. Such a discrepancy has been found in all other Invar materials.
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  • Yoshio Kitaoka, Hiroshi Yasuoka, Shinji Ogawa
    1982 Volume 51 Issue 9 Pages 2707-2708
    Published: September 15, 1982
    Released on J-STAGE: May 29, 2007
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    From an analysis of the 61Ni NMR spectrum of a metallic compound NiS1.4Se0.6 observed in the antiferromagnetic state, the magnetic moment distribution of the Ni atoms has been studied. Although the Ni atoms having one or less S atoms in its nearest neighbor are essentially non magnetic, it is indicated that the magnetic moment has an inhomogeneous distribution depending on the configurations of the chalcogen atoms in the nearest neighbors. The average moment for all Ni atoms is estimated to be 0.7 μB, which is in good agreement with 0.6 μB obtained from neutron diffraction experiment.
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  • Katsuhiro Kohda, Nobuo Nakamura, Hideaki Chihara
    1982 Volume 51 Issue 9 Pages 2709-2710
    Published: September 15, 1982
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    An anomalous decrease in the proton spin-lattice relaxation time was observed around 85 K in crystalline benzil. This anomaouls behavior was interpreted in terms of the critical slowing down of the molecular motion associated with the structural phase transition in the substance.
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  • Hiroshi Bando, Kokichi Oshima, Mitsuru Suzuki, Hayao Kobayashi, Gunzi ...
    1982 Volume 51 Issue 9 Pages 2711-2712
    Published: September 15, 1982
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    Angular dependence of the transverse magnetoresistance in (TMTSF)2ClO4 was measured in a-plane down to 0.47 K and H up to 13 T. Two types of Shubnikov-de Haas (SdH) oscillations were observed for the angle |θ| between H and c*-axis less than 60 degrees: One with period 0.015 cos θ T−1, comparable to that found in (TMTSF)2PF6, and newly observed one with (0.0036 cos θ+0.0002) T−1. If these correspond to electron- and hole Fermi surfaces respectively, they support the compensated as well as the quasi-two dimensional feature of this organic metal.
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  • Yuzo Mori, Ryo Hattori, Hiroshi Ohkura
    1982 Volume 51 Issue 9 Pages 2713-2714
    Published: September 15, 1982
    Released on J-STAGE: May 29, 2007
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    The secondary emission RSE emitted after resonant excitation of F center in KCl has been measured over the whole Stokes range at 80 K. The degree of polarization P defined for the RSE intensities parallel and perpendicular to resonant light polarization is measured over the same range. The spectrum of P is divided into three successive regions; the depolarization range at the one-phonon Raman scattering, the near plateau range, and the depolarization range down to vanishing. The former two are found to depend on the resonant photon energy. The latter may be caused by the level crossing of 2s- and 2p-like electronic states during non-radiative process.
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  • Hisao Kobayashi, Nobuo Oda
    1982 Volume 51 Issue 9 Pages 2715-2716
    Published: September 15, 1982
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    Relative emission yields of Balmer lines as functions of the dwell time (tD=0.97–12.3 fs) in thin carbon foils are measured with beams of H+, H2+, and H3+ impinging on thin carbon foils at 0.5 and 0.8 MeV/amu. Large molecular enhancements of emission yields of Balmer lines are observed for H2+ and H3+ beams, where (i) the molecular enhancements for H2+ and H3+ depend on the principal quantum number (n=3–6), (ii) the molecular enhancement for H3+ is higher than that for H2+, and (iii) the molecular enhancements decrease very rapidly in the red regiem (tD\lesssim2 fs) and slowly in the blue regiem (tD\gtrsim2 fs) with increasing tD.
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  • Naoaki Bekki
    1982 Volume 51 Issue 9 Pages 2717-2718
    Published: September 15, 1982
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    The parametric excitation of convective cells in the short-wavelength drift waves is investigated. The general dispersion relation is presented for the decay instability, and the scale-length of convective cells is evaluated. It is shown that an excited convective cell due to the nonlinear mode-coupling yields a radial flow (in the direction of inhomogeneity) and can enhance the anomalous transport.
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  • Yoshimasa Matsuno
    1982 Volume 51 Issue 9 Pages 2719-2720
    Published: September 15, 1982
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    It is shown that the N-soliton solution of the Benjamin-Ono equation is derived from the system of N linear algebraic equations.
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  • Yoko Hamano, Fumiaki Shibata
    1982 Volume 51 Issue 9 Pages 2721-2727
    Published: September 15, 1982
    Released on J-STAGE: June 01, 2007
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    A generalized rotational diffusion equation, which governs time-evolution of spin relaxation process, is solved rigorously. Although the original equation is rather involved with time dependent coefficients, the solution is quite simple and is seen to have a wide range of applicability. From the solution, all the previous results are obtained as special cases.
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  • Yoko Hamano, Fumiaki Shibata
    1982 Volume 51 Issue 9 Pages 2728-2734
    Published: September 15, 1982
    Released on J-STAGE: June 01, 2007
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    Detailed numerical analysis is made on the transverse relaxation process and on the power spectrum. These are expressed in terms of a superposition of 2J-functions [J the magnitude of spin]. For the transverse relaxation process with initial conditions far from equilibrium state, these 2J functions do contribute especially at an early stage of time-evolution; near the equilibrium, only a single function with the minimum eigenvalue survives.
    Due to the nonlinearities, under certain circumstances, average of the transverse component of spins enhances itself to reach a maximum value and decreases as the time evolves: This is recognized as a phase coherence phenomenon induced by the nonlinear effect and is out of the scope of the usual linear theory.
    The power spectrum is, however, determined essentially by the single function and consequently, simple rules are deduced from the numerical analysis, even for arbitrary value of J. Analysis on the “Cole-Cole” diagram suggests a sort of universality in the relaxation process.
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  • Yasushi Wada
    1982 Volume 51 Issue 9 Pages 2735-2745
    Published: September 15, 1982
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    A kink in a system of a φ4-chain undergoes a Brownian motion due to the collisions with thermally excited phonons. Deviations from the classical kink motion are associated with the Brownian motion. They are described by the quantum mechanics. Heisenberg equations of motion are solved, using an iteration method, to see how the kink behaves. With the help of the fluctuation-dissipation theorem, the diffusion constant is evaluated at low temperatures where the lowest order processes are important. The quantum effect becomes appreciable, when the temperature is lowered than the typical phonon energy. It reduces the diffusion constant drastically, since the number of thermally excited phonons is reduced. A diagram method is proposed to study the higher order processes which would become effective at higher temperatures.
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  • Kiiti Siratori, Kay Kohn, Hidenori Suwa, Eiji Kita, Shohei Tamura, Fum ...
    1982 Volume 51 Issue 9 Pages 2746-2754
    Published: September 15, 1982
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    Precise measurement of static magnetization in a weak external field was carried out for ferromagnetic solid solution, EuxSr1−xS. It is shown experimentally that the situation near the transition point is unchanged by the dilution: the magnetization can be expressed only by the magnetic field if both quantities are scaled for temperature as mM·|(TTc)−1|−β and hH·|(TTc)−1|−βδ, respectively, provided that βcal=γ⁄(δ−1) is used in the scaling instead of experimentally determined β. When x is larger than 0.85, βcal coincides with β. βcal is larger than β for x less than 0.85. In the latter case, above argument on the scaling does not hold in the immediate neighbourhood of the transition point, T=Tc, H=0. The boundary of the region is shown in the T-H plane where the scaled magnetic equation of state exists. Critical indices β, γ and δ, experimentally determined and used in the scaling, change appreciably with Eu concentration. Both γ−1 and the ferromagnetic Curie point, Tc, have a same dependence on x.
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  • Teruo Matsushita
    1982 Volume 51 Issue 9 Pages 2755-2760
    Published: September 15, 1982
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    The proximity effect of a thin normal metal layer in a superconductor is investigated by solving the phenomenological Ginzburg-Landau equations. The thickness of the normal layer is assumed to be much smaller than the electron mean free path. The degradation of the induced order parameter in the normal layer from the bulk superconductivity is proportional to both the repulsive potential for Cooper pairs in the normal layer and its thickness. It is elucidated that the superconductivity is degradated also in the superconducting region in the vicinity of the normal layer. The present result is compared with the result of the McMillan’s tunneling theory.
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  • Yoshihisa Obi, Hiroyasu Fujimori, Hiroaki Morita
    1982 Volume 51 Issue 9 Pages 2761-2767
    Published: September 15, 1982
    Released on J-STAGE: May 29, 2007
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    Low temperature magnetic properties of amorphous (Ni1−xMnx)82Si10B8 alloys were investigated. The alloys in the range of 0.18≤x≤0.5 showed a magnetic nature of the so called mictomagnetism, characteristics with asymmetrical hysteresis loop due to unidirectional exchange anisotropy. These characteristics were similar to the mictomagnetic properties observed in crystalline Ni–Mn alloys.
    Among models that were proposed for the crystalline mictomagnets, local environment model based on ferro- and antiferro-magnetic interactions of nearest neighbour atoms was more applicable to the amorphous alloys rather than heterogeneous structure model based on ferro- and antiferro-magnetic macroscopic aggregations of atoms, because the structure of amorphous alloys is considerably homogeneous.
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  • Katsuma Yagasaki, Yowa Kadena, Hironobu Fujii, Tetsuhiko Okamoto
    1982 Volume 51 Issue 9 Pages 2768-2771
    Published: September 15, 1982
    Released on J-STAGE: May 29, 2007
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    The magnetization curves at 4.2 K and the initial susceptibility from 4.2 K up to room temperature along the principal crystallographic axes have been measured on a single crystal of PrAg compound. The compound is antiferromagnetic below 10 K. The magnetization curve has two spin-flop transitions; one of them occurs at critical field of 1.3 kOe (Hc1) along all the principal axes, and the other takes place at about 15 kOe (Hc2). The magnitude of magnetization along all the axes become equal at about 46 kOe (Ha). The order for magnitude of the magnetization is reversed for higher field than Ha. The results are discussed briefly and the canted spin configurations are proposed.
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  • Masatsugu Suzuki
    1982 Volume 51 Issue 9 Pages 2772-2776
    Published: September 15, 1982
    Released on J-STAGE: May 29, 2007
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    The magnetic AC susceptibility of the two-dimensional (2D) ferromagnet K2CuF4 has been measured in the presence of external magnetic field H perpendicular to the easy plane. It is found that there occurs the crossover of the critical behaviour from 2D XY to 2D Heisenberg along the line in the H-T plane which is described by TgTH1.0±0.1 with Tg=7.5 K. This fact gives direct evidence that the critical behaviour is mainly supported by the easy-plane type anisotropy field.
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  • Yasunori Kubo, Shoji Ishida
    1982 Volume 51 Issue 9 Pages 2777-2786
    Published: September 15, 1982
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    The Stoner excitation spectrum in the ferromagnetic Heusler alloys X2MnY (X=Ni, Cu, Pd, Y=Al, Sn) is evaluated on the basis of the realistic band structure obtained by T.B.-OPW method. The acoustical spin wave excitation in X2MnY is investigated by relating that to the Stoner excitation. It is remarked that, in the spin wave excitation in Cu2MnAl, the relative contributions from the five d-states of Mn are almost same in contrast to the case of Pd2MnSn in which the contribution from the dγ-state of Mn is dominantly important. The situation in Ni2MnSn is nearly intermediate between those of Cu2MnAl and Pd2MnSn. It is shown that the Stoner excitation spectrum in Cu2MnAl rapidly varies with increasing wave vector q compared with the cases of Ni2MnSn and Pd2MnSn. It is indicated that the nearest neighbor exchange interaction in X=Cu is particularly large compared with that in the other X-atoms in good correspondence with the result obtained by Ishikawa et at.
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  • Kunihiko Yamaji
    1982 Volume 51 Issue 9 Pages 2787-2797
    Published: September 15, 1982
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    A quasi one-dimensional Hubbard model embodying features of (TMTSF)2PF6 etc. was studied. The SDW gap equation derived by a variational method is solved. The gap parameter is derived at OK and at finite temperatures as a function of the transverse electron transfer energy t′. The SDW transition proves to be of the second order. The upper and lower bands separated by the SDW gap start to overlap due to finite value of t′ when the gap becomes smaller than the magnitude of modulation of band extrema. The temperature dividing the SDW phase into semiconducting and semimetallic phases is also obtained. Physical properties such as state density, magnetoresistivity, conductivity, susceptibility etc. are briefly described. Experimental observations agree qualitatively well with the above results, if we take t′∼300kB and assume appropriate pressure dependence of t′.
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  • Hiroshi Kono, Kenichi Hashizume
    1982 Volume 51 Issue 9 Pages 2798-2800
    Published: September 15, 1982
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    Differential thermal analyses (DTA) by heating and cooling are carried out for Fe and Ni specimens. Though each specimen has a sharp λ-type peak at the magnetic transition point Tc on the heating DTA curve, a λ-type peak with a rounded top is found by us for each specimen at the temperature a little below Tc on cooling. It can be interpreted that the nucleation and growth of the magnetic domain in a non-ferromagnetic matrix starts from Tc on cooling. This phenomenon is found for pure metals such as Fe or Ni. Therefore, it can not be considered to be due to the compositional inhomogeneity.
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  • Manabu Kishi, Shigeto Miura, Yasuaki Nakagawa, Noboru Kimizuka, Isamu ...
    1982 Volume 51 Issue 9 Pages 2801-2805
    Published: September 15, 1982
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    Magnetizations of hexagonal compounds YbFe2O4+x (polycrystals with x=−0.027, −0.003 and +0.015 and a single crystal with x=+0.03) have been measured in a temperature range between 4.2 K and room temperature. Remanent magnetizations are induced by magnetic fields applied during cooling below about 250 K. Dependences of lattice parameters on x and temperature have also been determined. No lattice distortion occurs at low temperatures in contrast to the case of YFe2O4.
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  • Tôru Moriya
    1982 Volume 51 Issue 9 Pages 2806-2818
    Published: September 15, 1982
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    Universal expressions are given for the magnetic susceptibility, the average of the squared local amplitude of spin fluctuation: SL2(T) as a function of temperature and its constituent q-components, and the spatial spin correlation function above TC. Existing experimental data for some of typical ferromagnetic metals are analyzed in terms of the longitudinal and transverse stiffness constants for the spin fluctuation, SL2(TC), and an effective wave vector cut-off parameter. Possibility for the existence of strong short range order in itinerant magnets such as Fe and Ni is discussed in the light of this analysis.
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  • Satoshi Hirosawa, Yoji Nakamura
    1982 Volume 51 Issue 9 Pages 2819-2825
    Published: September 15, 1982
    Released on J-STAGE: May 29, 2007
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    Curie temperature, magnetization and 59Co NMR have been measured for the pseudobinary R1−xYxCo2 (R=Pr and Ho). In the Pr system, the hyperfine field distribution curve of Co obtained from the NMR spectra shows a well resolved satellite structure, while in the Ho system no additional structure appears in the distribution curve by replacing Ho with Y. These results are discussed in terms of a local environment effect of Co atoms and of the metamagnetic nature of the onset of the Co moment. It is suggested that the Pr moment increases with increasing Y concentration becuase of a decrease in the crystal field.
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  • Yasuo Endoh, Jun’ichiro Mizuki, Yoshikazu Ishikawa
    1982 Volume 51 Issue 9 Pages 2826-2832
    Published: September 15, 1982
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    The magnetic phase diagram of the dilute CrSi alloy system has been studied by neutron diffraction under applied pressures of up to ∼5 kbar. In Cr 1.4 at.%Si the incommensurate spin density wave (ISDW) phase appears above the commensurate spin density wave (CSDW) phase at pressures higher than about 2 kbar. Apart from the existence of the ISDW below the CSDW phase, the phase diagram of Cr 1.4 at.%Si in temperature vs pressure coordinates is quite similar to that of Cr 3 at.%Fe. The first order paramagnetic-CSDW transition in CrSi is discussed within the framework of a two band model.
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  • Nobuo Wada, Koji Ubukoshi, Kinshiro Hirakawa
    1982 Volume 51 Issue 9 Pages 2833-2839
    Published: September 15, 1982
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    RbFeCl3 is composed of one-dimensional chains in which the spins interact ferromagnetically with XY-like anisotropy. These chains are coupled antiferromagnetically in the hexagonal basal plane. It undergoes three transitions at TN1=2.5 K, TN2=2.35 K and TN3=1.95 K. In order to understand the nature of these transitions, we performed a neutron scattering study. Besides the previously determined 120°-structure observed at T<TN3, we found two different incommensurate structures in the basal plane at TN3<T<TN2 and TN2<T<TN1. Only, the transition at TN3 is the first order, but the other two are the second order. The effect of the field applied parallel to the easy plane has also been studied.
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  • Yuri Nakao, Shinya Wakoh
    1982 Volume 51 Issue 9 Pages 2840-2846
    Published: September 15, 1982
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    In order to study effects of choice of alloy potentials on the band structures of binary alloys, calculations of the spectral density and complex energy bands of Nb1−xMox are carried out in the average t-matrix approximation scheme. The alloy potentials are constructed in three ways by using the muffin-tin potentials of pure Nb and Mo. Choice of the alloy potentials remarkably affects the imaginary parts of the energy eigenvalues, while the band structures themselves remain almost unaffected. For alloy systems such as Nb–Mo, it is found that, with carefully constructed potentials, the average t-matrix approximation scheme can give as good results as those obtained by the coherent potential approximation scheme.
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  • Yuri Nakao, Shinya Wakoh
    1982 Volume 51 Issue 9 Pages 2847-2851
    Published: September 15, 1982
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    The electronic momentum densities and the Compton profiles in Nb1−xMox alloys are calculated on the basis of the KKR–ATA scheme with three different alloy potentials. The peak widths of the spectral momentum density and the calculated Compton profiles are strongly influenced by the alloy potentials used. The effect of alloying with Mo can be seen in the changes of the fine structures on the calculated Compton profiles. It is demonstrated that measurements of the Compton profiles can provide information about the construction of realistic alloy potentials.
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  • Yuzo Shinozuka
    1982 Volume 51 Issue 9 Pages 2852-2861
    Published: September 15, 1982
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    Nonradiative multiphonon recombinations are described consistently as pairs of an electron capture and a hole capture with many electron representation. Adiabatic potentials are calculated as a sum of N electrons’ energy and the potential energy of N ions with taking care of the cooperation of the electron-lattice interaction and the defect potential. It is shown that by the electron (hole) capture electronic energy of an order of the thermal depth of an electron (hole) localized at the defect is converted to the lattice energy. Every capture process can be enhanced by the transient lattice vibration triggered by the last opposite carrier capture. This actually occurs at almost every defects with lattice relaxation energy being larger than the half of the band gap width, when both carriers are injected with high density as is met in active laser diodes.
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  • Toshikatsu Miki, Motoji Ikeya
    1982 Volume 51 Issue 9 Pages 2862-2868
    Published: September 15, 1982
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    Thermoluminescence (TL) of LiH irradiated by X-rays at 12 K was studied together with thermally stimulated current (TSC) and F center annealing. The TL curve consists of a prominent peak at 52 K, weak peaks at 82 K and around 170 K and a broad underlying peak that extends from 12 K to 200 K; the broad peak is composed of many peaks with slightly different activation energies. No TSC peak was observed below 80 K in spite of the presence of TL at low temperature. By annealing, the optical density of the F band formed by X-irradiation is decreased gradually up to 40 K and rapidly at about 55 K, but increased above 80 K until 110 K. These results were interpreted as due to the recombination and the dissociation of the close pairs of an F center and an interstitial hydrogen atom separated by various distances. The formation of close pairs in LiH was attributed to the small space for the interstitial in LiH lattice and to the absence of π type orbitals in a crowdion type separation of the F center and the interstitial.
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  • Akiko Natori
    1982 Volume 51 Issue 9 Pages 2869-2877
    Published: September 15, 1982
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    The electron correlation effect in impurity doped semiconductors is investigated with use of alloy type model Hamiltonian. The formation of localized moment and the consequent structures on the density of states corresponding to the impurity band, D band and host conduction band is studied in the Hartree-Fock approximation and coherent potential approximation. It is shown that the electron correlation effect is emphasized on impurity sites and the metal-insulator transition occurs at the critical impurity concentration induced by the formation of localized moment. Further the effect of valley degeneracy in the case of many valley semiconductors is examined and pointed out to be important on the manner of formation of localized moment in concentrations near the metal-insulator transition.
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  • Shin Akahoshi, Yasushi Tsunoura, Hiroshi Ninomiya, Kenzi Hukuda
    1982 Volume 51 Issue 9 Pages 2878-2884
    Published: September 15, 1982
    Released on J-STAGE: May 29, 2007
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    Behavior of 77Se hyperfine structure of DKDP: SeO43− is reported in detail. The spectroscopic splitting tensor and the hyperfine interaction tensor are determined in both paraelectric and ferroelectric phases. The coercive electric field is measured to be 4.4 [kV/cm]. The striking effect of deuteration on the temperature dependence of the hyperfine structure is successfully explained under an assumption that the rate of slow fluctuation of the Se atom in the SeO43− is independent of deuteration in the paraelectric phase. It is pointed out that the results on Cr5+ in KDP, DKDP, KDA and DKDA are quite different from those on SeO43− in KDP and DKDP and AsO44− in KDA and DKDA with respect to the deuteration effect on the rate of the fluctuation observed by ESR.
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  • Kêitsiro Aizu
    1982 Volume 51 Issue 9 Pages 2885-2890
    Published: September 15, 1982
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    The qualitative and quantitative results deduced by a recent theory [J. Phys. Soc. Jpn. 51 (1982) 515] were found to agree fairly well with the experimental results on NaNO2. However, of the theoretical ε vs T graph, the part just above the incommensurate-to-ferroelectric transition point was found to disagree with the observed one even qualitatively. Resolution of this item of disagreement is attempted in the present paper. To fundamental waves Qa cos (hx−θQ) and Ra cos (hx−θR) which are a soft B2u wave and a hard B1g wave respectively, waves Qa′ cos (2hx−θQ′) and Ra′ cos (2hx−θR′) are added (the wavenumber of added waves must be 2h, not any other); no further modification is made. This way is found to clear up the item of disagreement while not affecting at all any of the items of agreement in the recent paper.
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  • Izumi Tomeno
    1982 Volume 51 Issue 9 Pages 2891-2899
    Published: September 15, 1982
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    The elastic stiffnesses C11, C33, C44 and C66=(C11C12)⁄2 of both single domain (SD) and multidomain (MD) LiTaO3 crystals were measured between 20 and 700°C by the ultrasonic phase comparison method. The stiffnesses Cii′ (i=1, 4 and 6) of the MD crystal were larger than CiiE of the SD crystal, respectively, while C33′ of the MD crystal, which was smaller than C33P of the SD crystal, was equal to C33E. In the paraelectric phase CiiP (i=1, 3, 4 and 6) decreased linearly with increasing temperature, except for near TC. In the ferroelectric phase, non-linear temperature dependence of CiiE (i=1, 4 and 6) can be accounted for by the electrostrictive interaction. On the other hand, weak temperature dependence of C33PC33E below 500°C and marked change in C33PC33E between 500°C and TC may be related to higher order interaction and fluctuation of spontaneous polarization, respectively.
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  • Tomoyuki Hikita, Tsuneo Tsukahara, Takuro Ikeda
    1982 Volume 51 Issue 9 Pages 2900-2909
    Published: September 15, 1982
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    Ultrasonic velocites have been determined on the ferroelectric (NH4)2BeF4 as functions of both temperature and pressure. Special attention has been paid to the incommensurate phase which appears in a narrow temperature range. The temperature dependence of sound velocities corresponding to the elastic constants c11, c22, c33, c44, c55, c66 has been obtained at several constant pressures. A distinct pressure dependence was observed in the variation of the c22 component with temperature.
    The ultrasonic attenuation of the longitudinal sound propagated along the a-axis has been measured under pressure. From the result of the attenuation measurement and the Brillouin scattering data, it was found that the relaxation time in the normal phase is given by τeff0⁄((TTI)⁄TI)−1.3 at atmospheric pressure. The elementary relaxation time τ0 is determined to be (1.1±0.3)×10−13 sec.
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  • Yasuhiro Kamijo, Ryuji Abe
    1982 Volume 51 Issue 9 Pages 2910-2913
    Published: September 15, 1982
    Released on J-STAGE: May 29, 2007
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    Dielectric and elastic properties of the mixed crystals, Li(NH4)1−xTlxC4H4O6·H2O, were investigated for various content of Tl+ ion. For the mixed crystal with x=0.5, an antiferroelectric hysteresis loop was observed at liquid helium temperature when the electric field was applied along the a-axis. The role of NH4+ ion or Tl+ ion on the phase transition of these substances is discussed according to the results.
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  • Masanori Cho, Toshirou Yagi, Takashi Fujii, Akikatsu Sawada, Yoshihiro ...
    1982 Volume 51 Issue 9 Pages 2914-2919
    Published: September 15, 1982
    Released on J-STAGE: June 01, 2007
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    The elastic instability in the ferroelastic phase transition of BiVO4 was investigated by the observation of the Brillouin scattering spectra as a function of temperature around the transition temperature. From the temperature dependence of the observed spectra in two different scattering geometries it turns out clear that the softening of elastic stifiness constant c11c12, not of c66, causes the ferroelastic transition. The elastic softening is discussed in connection with the domain structure.
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  • Hiroshi Tochihara, Yoshitada Murata
    1982 Volume 51 Issue 9 Pages 2920-2926
    Published: September 15, 1982
    Released on J-STAGE: June 01, 2007
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    Angle-integrated low-energy electron-energy-loss spectroscopy (EELS) was measured as a function of coverage for studying electronic excitations in Cs atoms deposited onto a clean Si(100) 2×1. surface and simultaneously AES, LEED, Δφ, and UPS were observed. The energy loss peak (1 eV) in the EEL spectrum appears with large intensity at the saturation coverage of a half monolayer and is not observed at lower coverages. This energy loss is assigned to the plasmon excitation in Cs overlayer on silicon as observed in alkali atoms on noble and transition metals. It is suggested that the observed plasmon excitation in Cs atoms has a one-dimensional character from the standpoint of the geometrical model proposed by Levine [J. D. Levine: Surf. Sci. 34 (1973) 901], where Cs atoms form one-dimensional chains on the raised site at a half monolayer.
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  • Masaru Tsukada
    1982 Volume 51 Issue 9 Pages 2927-2933
    Published: September 15, 1982
    Released on J-STAGE: June 01, 2007
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    Non-adiabatic behavior of adsorbates near the crossing region of the potential surfaces is analysed by the stochastic trajectory method. The branching ratio of the electronic states is remarkably influenced by the interaction with the surface heat bath. For the passage from the ground state the transition to the excited state is considerably enhanced compared with that by the Landau-Zener theory. For the slow passage from the excited state, the transition to the ground state is predominant, if the coupling to the heat bath is significant. Implication of the result is discussed in relation to the Na scattering on W surface and the electron stimulated desorption.
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  • Izumi Hirabayashi, Yoshinori Tokura, Takao Koda
    1982 Volume 51 Issue 9 Pages 2934-2946
    Published: September 15, 1982
    Released on J-STAGE: June 01, 2007
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    The surface exciton polaritons associated with the A, B and C excitons in ZnO are investigated by the attenuated total reflection (ATR) measurements. The concept of the surface admittance is introduced to understand the characteristic nature of the surface polaritons in anisotropic ZnO crystal. The experimental ATR spectra and the dispersion curves for the respective excitons are analyzed taking account of the anisotropic and non-local exciton dielectric functions and of the surface layer effect. The real and virtual surface polariton modes are identified on the B exciton from the experimental dispersion curves for particular geometries. Besides, a pseudo-surface mode is observed as additional ATR dips and is interpreted as the guided-wave mode propagating along an optical wave-guide-like structure, ZnO-surface layer-MgF2 gap, under specific conditions.
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  • Hitoshi Nishimura, Takao Yamano
    1982 Volume 51 Issue 9 Pages 2947-2954
    Published: September 15, 1982
    Released on J-STAGE: May 29, 2007
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    The spectrum and the quantum yield of the 1s free exciton luminescence in alkali iodides have been studied as a function of temperature. These results are strongly dependent on the samples used. On the basis of these results the intrinsic nature of the luminescence process and the self-trapping process of the 1s free excitons has been studied.
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  • Katsuaki Sato, Teruo Teranishi
    1982 Volume 51 Issue 9 Pages 2955-2961
    Published: September 15, 1982
    Released on J-STAGE: June 01, 2007
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    Reflectance magneto-circular dichroism spectra and Kerr rotation spectra have been measured for the first time on a pyrite type ferromagnet CoS2, for photon energies between 0.5 and 3.5 eV below the Curie temperature. There have been observed three major structures around 0.8, 1.5 and 2.8 eV, among which the most prominent is the one at 0.8 eV; the Kerr rotation reaches the value of 1.1° at the peak. Real and imaginary parts of the off-diagonal element of the dielectric tensor have been calculated from the observed spectra. Theoretical study has revealed that the line shape of the 0.8 eV structure can be explained in terms of the localized many-electron excitation associated with the dε–dγ absorption edge of this compound. This corresponds to the narrow-band nature of the pyrite type compound.
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  • Yuji Kuwamura, Yoshitomo Yokota, Masuo Fukui, Osamu Tada
    1982 Volume 51 Issue 9 Pages 2962-2965
    Published: September 15, 1982
    Released on J-STAGE: June 01, 2007
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    Using an angle-frequency scan method, we provide the first experimental observation of ATR mode of surface polaritons in Ag that are characterized by a complex frequency and a real wavevector. We moreover discuss various features of new ATR mode, comparing with those of the other two ATR modes.
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  • Demitrios K. Papademitriou, Demitrios M. Miliotis
    1982 Volume 51 Issue 9 Pages 2966-2972
    Published: September 15, 1982
    Released on J-STAGE: May 29, 2007
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    Spectroscopic analysis of scattered X-rays from polycrystalline Be irradiated by Cu Kα1, Kα2 radiations, shows two separated bands with an energy shift of 120±1 eV from the position of the corresponding coherently scattered radiations. These two bands are characterized as X-ray Raman scattering bands. Their position in the spectrum, is independent of the scattering angle.
    Measuring the F.W.H.M. of the experimentally found Kα1 X-ray Raman band and the used as primary, we made a quantitative estimation of the Half Width of the density of states band just above the Fermi level.
    The intensity ratios of the Raman bands at six different scattering angles, are in very good agreement with the corresponding ratios of the intensity factors, suggested by Mizuno and Ohmura. Furthermore two bands found at the long wavelength limit cannot be attributed to the antibonding effect of Be atoms, before we extend our measurements.
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  • Kiyoshi Ueda, Yoshihiro Hamaguchi, Kuniya Fukuda
    1982 Volume 51 Issue 9 Pages 2973-2976
    Published: September 15, 1982
    Released on J-STAGE: May 29, 2007
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    Oscillator strengths (f values) for the transitions 4s4p 3P-4sns 3S with n=5 and 6, -4snd 3D with n=4 and 5, -4p2 3P, and -3d2 3P have been determined by using the hook method. The metastable 4s4p 3P levels are populated by a DCdischarge. The absolute scale is based on recent lifetime measurements for 4s5s 3S and 4s4d 3D. The resulting absolute f values are in reasonable agreement with the data of NBS compilation except for 4s4p 3P-4s5s 3S but show significant discrepancy with recent theoretical values.
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  • Yoh Itoh, Nobuo Kobayashi, Yozaburo Kaneko
    1982 Volume 51 Issue 9 Pages 2977-2981
    Published: September 15, 1982
    Released on J-STAGE: June 01, 2007
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    Vibrational excitation of CO2 molecules of the ground electronic state by 203 eV Li+ incident was measured with an ion energy-loss spectrometer at nearly 0°. The energy resolution (F.W.H.M.) of the spectrometer was 14 meV. The attention was mainly directed to the excitation of overtones of bending mode, nν2. Only the peaks corresponding to the excitation of (0220) and (0330) levels were observed for 2ν2l and 3ν2l, respectively. The excitation cross section of the state (0330) was estimated to be about 2×10−18 cm2 at EI=203 eV. The excitation of 3ν2 was explained by a third order perturbation through a three step process (0000)→(0110)→(0220)→(0330) where each step is caused by a perturbation of charge-dipole force linearly depending on the vibrational coordinate of the molecule.
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  • Tomoko Ohyama Yamaguchi, Yukikazu Itikawa
    1982 Volume 51 Issue 9 Pages 2982-2988
    Published: September 15, 1982
    Released on J-STAGE: June 01, 2007
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    Total charge transfer cross sections are calculated for the collisions of Li3+ and Be4+ ions with H(1s) atoms in the low energy region (E<25 keV/amu). The perturbed-stationaly-state method in the impact parameter approximation is used with a basis set of adiabatic one-electron two-center molecular orbitals. For the Li3+–H system, a reasonable agreement is found between the present calculation and the recent experiment.
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  • Masayasu Tanjyo, Yoshiyuki Aso, Kei-ichi Hirano
    1982 Volume 51 Issue 9 Pages 2989-2998
    Published: September 15, 1982
    Released on J-STAGE: June 01, 2007
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    A linear theta pinch machine, STP–L has been constructed to study the improvement of the heating efficiency by successive two fast capacitor discharges. The concept of the staged theta pinch which assumes the application of ideal two square magnetic field pulses is modified into more practical one. It is demonstrated experimentally and theoretically that the control of the small dip which appears just after the maximum implosion gives considerable effects on the final plasma temperature. The maximum heating gain by such control is found to be 1.6. Under a typical operating condition in which the dip is controlled we achieved the following plasma parameters; the plasma diameter is equal to 3.2 cm, the average plasma density 5.3×1015 cm−3 and the total temperature 650 eV.
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