Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
Volume 56, Issue 6
Displaying 1-48 of 48 articles from this issue
  • Hiroshi Kondoh, Mitsugu Matsushita, Yoshiichi Fukuda
    1987 Volume 56 Issue 6 Pages 1913-1915
    Published: June 15, 1987
    Released on J-STAGE: May 29, 2007
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    We investigated the scaling property of the drainage basin patterns generated by computer-simulation of the Scheidegger’s river network model, which is a type of directed percolation model. Growth exponents are obtained from the inclination of the log-log plot of the length L (parallel direction) and the width W (perpendicular direction) of the drainage basins as a function of the drainage area A, i.e., LAν⁄⁄ and WAν⊥. The values are found to be ν⁄⁄=2⁄3 and ν=1⁄3, and the patterns are not self-similar, but self-affine. The relation ν⁄⁄=1 indicates that the inner structure is nonfractal or compact. Theoretical considerations are also given to these results.
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  • Tatsuo Tsukamoto, Yoshiyuki Kawazoe, Haruhisa Miyase, Hiroaki Tsubota
    1987 Volume 56 Issue 6 Pages 1916-1919
    Published: June 15, 1987
    Released on J-STAGE: June 01, 2007
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    Surprisal analysis is applied to photoreaction. The statistical model of Hauser-Feshbach is extended to analyze the 63,65Cu(γ, p0) reactions. A unified understanding of the measured cross sections in the giant resonance energy region, which has yet to be achieved, is attempted.
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  • Kazuhiro Sano, Ippei Doi, Tomoki Minoguchi
    1987 Volume 56 Issue 6 Pages 1920-1923
    Published: June 15, 1987
    Released on J-STAGE: June 01, 2007
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    The superfluid transition temperature Tc is calculated for the 4He system in a model substrate of zeolite by the quantum lattice gas model. The reduction of Tc due to the geometry of the substrate is calculated by the quantum renormalization method. The result shows that Tc is proportional to 1⁄\sqrtL (L: the pore length), in contrast with the classical result that Tc∝1⁄L, and the superfluidity is expected to be observed experimentally unless the pore of zeolite is too long.
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  • Masaki Goda
    1987 Volume 56 Issue 6 Pages 1924-1927
    Published: June 15, 1987
    Released on J-STAGE: June 01, 2007
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    A power law with respect to length n is numerically observed in the off-diagonal term of the one-particle Green’s function gl,l±n(E) (E: energy, l: lattice site) and in the resistance r(n, E) and conductance g(n, E) of a Fibonacci lattice. The exponent is insensitive to energy, and the power law crosses over an exponential law at a length n*(E)=1⁄A(E), where A(E) is a Lyapunov exponent which is strongly energy-sensitive. As a result, power law conductivity and resistivity with respect to temperature T are expected to be observed over a suitable range of temperatures.
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  • Kiyotaka Shibata, Taizo Sasaki, Akira Morita
    1987 Volume 56 Issue 6 Pages 1928-1931
    Published: June 15, 1987
    Released on J-STAGE: May 29, 2007
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    The energy band structure of black phosphorus is recalculated using the ab initio norm-conserving pseudopotential calculation. The results show better agreement with the experiment of angle-resolved ultraviolet photoelectron spectroscopy than a previous band structure calculation, based on the pseudopotential of the Appelbaum-Hamann type.
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  • Masafumi Sera, Takeo Satoh, Tadao Kasuya
    1987 Volume 56 Issue 6 Pages 1932-1935
    Published: June 15, 1987
    Released on J-STAGE: May 29, 2007
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    CePtSi is a heavy fermion compound with an electronic specific heat coefficient, γ\simeq700 mJ/mole·K2. The electrical resistivity, magnetic susceptibility and specific heat suggest its nonmagnetic ground state.
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  • Satoshi Okuma, Fumio Komori, Shun-ichi Kobayashi
    1987 Volume 56 Issue 6 Pages 1936-1939
    Published: June 15, 1987
    Released on J-STAGE: May 29, 2007
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    Metal-insulator transition in disordered superconductors is studied to clarify the roles of spin-orbit and short-range Coulomb interactions. Films of Al and Al:Au exhibit almost the same superconductor (S)-insulator (I) transition with increasing disorder and/or magnetic field, indicating that the former is not important for S–I transition. In Al:Pd films, we observe the effect of short-range Coulomb interaction as the suppression of superconductivity and the tendency for the appearance of a normal phase between S and I.
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  • Yoshimasa Fujii, Hiromoto Uwe, Tunetaro Sakudo
    1987 Volume 56 Issue 6 Pages 1940-1942
    Published: June 15, 1987
    Released on J-STAGE: May 29, 2007
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    Through observation of the optical second harmonic generation, the stress-induced ferroelectric transition temperature of SrTiO3 was determined as a function of the applied uniaxial stress along the [100] direction. The characteristics of the temperature-stress phase diagram are in agreement with the theoretical prediction of the critical behavior of the quantum ferroelectricity.
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  • Toshio Sakai, Hisao Kawaura, Riso Kato
    1987 Volume 56 Issue 6 Pages 1943-1946
    Published: June 15, 1987
    Released on J-STAGE: May 29, 2007
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    Spectral and transient behavior of secondary emission in NaNO2 has been studied under the selective excitation with frequency νi in the region of the phonon sideband of the zero-phonon line at ν00 in the absorption spectrum. The emission line becomes broader and stronger as νi shifts from ν00 toward higher energy, and it splits into two or more-components when νi falls into valley regions of the phonon sideband. The maximum separation of the split components amounts to about 5 cm−1. The decay time of the emission is almost constant and about 7 ns for the change in νi. These results suggest that ν00 excitons are created in some limited regions of the exciton band in the Brillouin zone by the phonon-assisted optical transition, and that radiative annihilation of the exciton occurs before thermalization of the exciton is established.
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  • Junkichi Satsuma
    1987 Volume 56 Issue 6 Pages 1947-1950
    Published: June 15, 1987
    Released on J-STAGE: June 01, 2007
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    Explicit solutions are obtained for several nonlinear equations with density dependent diffusion by employing the Painlevé analysis. Included are equilibrium solutions, travelling wave solutions and other time-dependent solutions. Properties of these solutions are also briefly discussed.
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  • T. Kapitaniak
    1987 Volume 56 Issue 6 Pages 1951-1954
    Published: June 15, 1987
    Released on J-STAGE: May 29, 2007
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    The chaotic behaviour of anharmonic oscillators with time delay is investigated in the paper. The results are compared with those from an anharmonic oscillator without time delay.
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  • Shibani Sen, A. Roy Chowdhury
    1987 Volume 56 Issue 6 Pages 1955-1962
    Published: June 15, 1987
    Released on J-STAGE: May 29, 2007
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    We have constructed some Bethe Eigenstates for the Supersymmetric Nonlinear Schrödinger equation. The explicit form of the corresponding wave functions are constructed. The time dependence of the states are analysed by using Galilean Group of Symmetry associated with the equation.
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  • Yutaka Okabe, Macoto Kikuchi
    1987 Volume 56 Issue 6 Pages 1963-1973
    Published: June 15, 1987
    Released on J-STAGE: June 01, 2007
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    The cluster-spin decomposition method is studied for the quantum Monte Carlo simulation based on the Suzuki-Trotter formula. A new vectorized algorithm for the speed-up of the calculation is implemented. We investigate the one-dimensional ferromagnetic and antiferromagnetic Heisenberg models, paying attention to the cluster size of decomposition.
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  • Kenzo Nagano, Yasuo Aoki, Teruo Kishimoto, Yoshihiro Tagishi, Kohsuke ...
    1987 Volume 56 Issue 6 Pages 1974-1988
    Published: June 15, 1987
    Released on J-STAGE: June 01, 2007
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    Vector analyzing powers A(θ) and differential cross sections σ(θ) have been measured by use of a polarized proton beam of 22.0 MeV for (p, t) reactions leading to the first-excited 2+ (21+) states of the eighteen nuclei of N=50–82: 92,94,96Mo, 98,100,102Ru, 102,104,106,108Pd, 110,112,114Cd, 116Sn, 120,126,128Te and 136Ba. In addition A(θ) and σ(θ) for 104,110Pd(p, t) 102,108Pd(0g+, 21+) have been measured at Ep=52.2 MeV. The results are analyzed in terms of the first- and second-order DWBA including both inelastic two-step and sequential transfer (p, d)(d, t) two-step processes. Interference between the direct and the two-step processes is important. The nuclear-structure wave functions are constructed under the boson expansion method and the quasiparticle random phase approximation method.
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  • Tatsuro Kiyoshima
    1987 Volume 56 Issue 6 Pages 1989-1995
    Published: June 15, 1987
    Released on J-STAGE: June 01, 2007
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    Radiative lifetimes of H2(d3Πu) in single rovibronic levels were measured by means of a delayed coincidence method combined with pulsed-electron impact excitation. The observed emission lines were selected Q- and R-rotational lines of the d3Πua3Σg+ transition. It was found that the lifetimes of Π-sublevels of v=0, 1, 2, 3, K=2 levels and of v=0, K=1 level were about 40 ns independent of rovibronic level, while the lifetimes of Π+-sublevels were strongly dependent on the vibrational level. The anomaly of the lifetimes of Π+-sublevels could be explained by an interaction between the d3Πu- and the e3 Σu+-levels.
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  • Seiji Tsurubuchi, Tatsuo Arikawa
    1987 Volume 56 Issue 6 Pages 1996-2003
    Published: June 15, 1987
    Released on J-STAGE: June 01, 2007
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    Collisions between Li+ and Ne have been studied in the projectile energy range between 0.4 to 4.0 keV by means of an optical spectroscopic technique. The partial excitation cross sections to the magnetic sub-levels of the 2p state of Li were obtained as well as emission cross sections for some LiI, NeI and NeII lines. The mechanism of the triplet state excitation of Ne is discussed on the basis of the promotion model.
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  • Osamu Aono, Ryo Sugihara
    1987 Volume 56 Issue 6 Pages 2004-2006
    Published: June 15, 1987
    Released on J-STAGE: May 29, 2007
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    It is shown by reduction to absurdity that the lines of magnetic flux in vacuum around a magnet can not rotate, even if the magnet rotates upon some axis.
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  • Shuji Asaka, Hiroki Nakatsuka, Masahiro Fujiwara, Masahiro Matsuoka
    1987 Volume 56 Issue 6 Pages 2007-2023
    Published: June 15, 1987
    Released on J-STAGE: June 01, 2007
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    An analytic theory and experimental studies of the accumulated photon echo is presented. We define a temporal correlation function \ ildeG of the excitation field E(t) as \ ildeG(τ, t)=(1⁄T1) ∫0 dtE(tt′)E(tt′−τ)·exp (−t′⁄T1), where T1 is the population relaxation time of the sample, and call the width of \ ildeG with respect to τ a temporal correlation time \ ildeτc(t). It is proved that the echo intensity is written by the temporal correlation functions when (1) T1 and the duration of the excitation light τp are much longer than \ ildeτc(t) in order to make the function \ ildeG(τ, t) well-defined, (2) T1 and τp are much longer than the homogeneous dephasing time T2, and (3) one can find a time interval Δt such that \ ildeG(τ, t) does not change much between t and t+Δt, where Δt>>\ ildeτc. Then we can show that the time resolution of the accumulated photon echo is determined by the averaged \ ildeτc(t) over an interval of the integration of the echo signal. This discussion is valid for any excitation source if the above conditions are satisfied, and applies to almost all cases of the practical accumulated photon echo experiment. A discussion is also made on the spurious spike on the echo decay curve near zero delay time that appeared in an experiment with a high time resolution in Nd3+-doped silicate glass. It is shown that the most probable cause for this spike is uncorrelated inhomogeneous broadenings of the resonant lines of neodymium ions.
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  • Yoshifumi Kimura
    1987 Volume 56 Issue 6 Pages 2024-2030
    Published: June 15, 1987
    Released on J-STAGE: June 01, 2007
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    Theory of the similarity solution of two-dimensional point vortices in an unbounded region is presented. To get the solution, the time dependence of the solution for all vortex positions are assumed to be the same. It is shown that the system either rotates rigidly or collapses according to the initial position of vortices. Then numerical calculations are made especially for the system of three vortices. It is found that the rigid rotation corresponds to the regular triangle solution or the straight line solution, and that irrespective of the strengths of three vortices, the regular triangle solution always exists while the straight line solution is obtained by solving a certain cubic equation.
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  • Toshio Funada
    1987 Volume 56 Issue 6 Pages 2031-2038
    Published: June 15, 1987
    Released on J-STAGE: June 01, 2007
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    Nonlinear surface waves of long wavelength driven by the Marangoni instability are investigated theoretically for a heat transfer system, in which a temperature of a thin liquid layer causes variations of the surface tension coefficient. For two examples considered here, the surface waves are governed, respectively, by a nonlinear evolution equation of diffusion type and the Kuramoto-Sivashinsky equation. It is shown that steady solutions for the first example, which are expressed by the cnoidal function, can be realized if a condition prescribed by values of parameters involved is satisfied at initial instants. It is also shown that the surface waves for the second example include two types of shock wave solutions.
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  • Takaya Hayashi, Tetsuya Sato
    1987 Volume 56 Issue 6 Pages 2039-2045
    Published: June 15, 1987
    Released on J-STAGE: June 01, 2007
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    The spin-stabilization of the tilt of the spheromak plasma confined by an external magnetic field is investigated by means of a 3D magnetohydrodynamic simulation. The spinning-spheromak equilibrium is dynamically created by giving a spinning speed as high as about Mach one of the poloidal Alfven velocity and simultaneously increasing the magnitude of the external field. The lifetime of the spheromak is thereby remarkably increased. However, a new, presumably pressure-driven, instability is induced by the spin motion, which after all determines the lifetime. The results are indicating that the spinning spheromak, if practically created, can be a good candidate for a feasible confinement configuration.
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  • Masaru Aniya, Mitsuaki Ginoza
    1987 Volume 56 Issue 6 Pages 2046-2055
    Published: June 15, 1987
    Released on J-STAGE: June 01, 2007
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    For the understanding of the temperature dependence of the static structure factor of liquid Li4Pb, the two-component system consisting of charged hard spheres with screened Coulomb interaction in a uniform neutralizing background charge is investigated in terms of the modified mean spherical approximation. It is found that in respect to the structure reflecting the chemical short range order the calculated temperature-dependence agrees reasonably well with the measured one. This result suggests that the effect of the background charge plays an essential role in the temperature variation of the static structure of liquid Li4Pb.
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  • Seiichi Kagoshima, Roger Whitehead, Martin R. Willis
    1987 Volume 56 Issue 6 Pages 2056-2059
    Published: June 15, 1987
    Released on J-STAGE: May 29, 2007
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    An orientational ordering of octahedral anions was found below about 180 K in the quasi one-dimensional conductor (TMTSF)2SbCl2F4. The ordered anions having electric dipole moments form a superstructure which doubles the unit cell along the b-axis, the direction nearly perpendicular to the one-dimensional axis. Possible inferrelation is discussed between the ordered structure and electrical properties, especially the superconductivity found in several salts belonging to the family of (TMTSF)2X.
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  • Yuji Ito, Naoteru Shigekawa, Mitsuo Harada, Kazuhiko Inoue, Peter B&ou ...
    1987 Volume 56 Issue 6 Pages 2060-2069
    Published: June 15, 1987
    Released on J-STAGE: June 01, 2007
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    Quasielastic neutron scattering studies on the get to liquid crystalline phase transition of the synthetic bimolecular membrane made of didodecyl dimethyl ammonium bromide (DDAB) dispersed in D2O were performed to reveal that the behavior of the proton motion of the alkyl chain changed drastically through the transition temperature. Below the transition temperature of 16.5°C, the predominant motion of protons is the vibrational one in the well defined potential well, whereas above the transition at T=20°C, superimposed upon the increased vibrational motion, protons can jump the average distance of the order of 0.5 Å in every 6 to 7 picosecond around the chain axis. Such observation and the presumed important role of the kink formation process attributed to the membrane transition are discussed from the view point of the constrained dynamical system.
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  • Toshiki Kishimoto, Toshio Osaka, Masaru Komukae, Yasuharu Makita
    1987 Volume 56 Issue 6 Pages 2070-2079
    Published: June 15, 1987
    Released on J-STAGE: June 01, 2007
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    Optical observation of twin structures, X-ray examinations and the measurement of the dielectric constant of (NH4)3H(SeO4)2 were carried out in reference to the phase transition at 29°C (Tc). It was found that (NH4)3H(SeO4)2 undergoes the improper ferro-elastic phase transition at Tc. The crystal is determined to be monoclinic with the space group A2⁄a below Tc and trigonal with the space group R\bar3m above Tc. The crystal has spontaneous strain (e22e11)⁄2=−3.0×10−3 and e13=3.3×10−3 at room temperature. It was clarified by both observation of domains and symmetry consideration that the crystal exhibits twin structures with two types of domain walls and three kinds of domain orientations at room temperature. The behaviour of the dielectric constant observed near Tc is well explained by the Landau theory.
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  • Eiichi Hanamura, Naoto Nagaosa
    1987 Volume 56 Issue 6 Pages 2080-2088
    Published: June 15, 1987
    Released on J-STAGE: June 01, 2007
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    A model of photo-induced structure change is presented to understand, from a unified view point, mechanisms of photo-polymerization of diacetylene and diolefin crystals and photo-isomerization of polydiacetylene crystal, photochromism and photo-chemical hole burning. We can realize at the same time how a cluster of photo-excited molecules is stabilized and how the molecular excitation far from the cluster is attracted to the nearest neighbor of the cluster. This theory will also give us a guiding principle to look for and design new materials for optical memory.
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  • Yoshihiro Ishibashi
    1987 Volume 56 Issue 6 Pages 2089-2093
    Published: June 15, 1987
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    The Slater-Takagi model of the ferroelectric phase transition in KH2PO4 is analyzed in detail. The transition is of the second order not only for partial removal but also for complete removal of the ice condition on proton distributions, as has been clarified by Silsbee et al. The free energy and the spontaneous polarization are given explicitly as functions of temperature. The role of the Takagi configuration is discussed.
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  • Tosizumi Aoki
    1987 Volume 56 Issue 6 Pages 2094-2097
    Published: June 15, 1987
    Released on J-STAGE: June 01, 2007
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    From the calculation of macroscopic sound velocity based upon the free energy derived by Matsubara and Matsuda within the molecular field approximation, it is shown that the ordinary spin waves of the Quantum Lattice Model (QLM) or the XY model do not directly correspond to the phonon excitation of liquid 4He. Instead of the spin waves, a new excitation with the usual macroscopic sound velocity is derived from the motion of the number operator, where the motion is taken into account to the second order in the time derivative within the effective-field approximation. The present calculation implies the possibility that the similar excitation exists in the one- or two-dimensional XY model which does not exhibit a long-range order.
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  • Tadao Sugiyama
    1987 Volume 56 Issue 6 Pages 2098-2103
    Published: June 15, 1987
    Released on J-STAGE: June 01, 2007
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    In one-dimension, effects of mutual interaction on the Kondo model is studied by using the renormalization group method and found that effective strong interaction suppresses the Kondo effect. When the backscattering g1 between electrons is positive, the Kondo effect is not too much weakened in a wide coupling region of mutual interaction. In the case of g1<0, the Kondo anomaly disappears when the absolute value of g1 exceeds the strength of the exchange coupling between the localized spin and conduction electrons. Furthermore, the Kondo temperature depending on the mutual interaction is obtained.
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  • Atsushi Oshiyama, Mineo Saito
    1987 Volume 56 Issue 6 Pages 2104-2112
    Published: June 15, 1987
    Released on J-STAGE: June 01, 2007
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    The first-principles pseudopotential total-energy calculation within the local density functional formalism has been performed for several types of semiconductors: Si, GaAs, AlAs and AlxGa1−xAs. The calculated lattice constant, bulk modulus, cohesive energy and the overall energy-band structure are in excellent agreement with the experimental data. Both the hard core and the soft core pseudopotentials are constructed from the first principles, and their validities are examined through the detailed calculations with the full converged plane-wave basis set. Further, the localized-orbital basis set is also introduced and is shown to give quantitative results. In particular, the electronic structure and the ground-state properties of GaAs under hydrostatic pressure are investigated with use of the localized-orbital basis set.
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  • K. S. Song, C. H. Leung
    1987 Volume 56 Issue 6 Pages 2113-2118
    Published: June 15, 1987
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    The adiabatic instability of the self-trapped exciton in alkali halide, as originally proposed by Toyozawa in 1978, has recently been shown to be not only very strong, but also quite general in alkali halides and alkaline earth fluorides. A number of properties of the off-center self-trapped exciton are presented here. These include a realistic re-evaluation of the pseudo Jahn-Teller hamiltonian parameters, the electric field gradient on the off-center Vk core, and the volume change induced by the self-trapped exciton and (F-H) pairs of varying separation.
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  • Itaru Maekawa, Fumio Takagi, Yoshio Sakai, Nobuo Tsuda
    1987 Volume 56 Issue 6 Pages 2119-2123
    Published: June 15, 1987
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    Thermoelectric power of Li1+xTi2−xO4(x=0, 0.15, 0.20, 0.22 and 0.25) were measured from 90 K to 300 K. Except for that of the metallic sample (x=0), Seebeck coefficients are proportional to temperature and it suggests a random distribution of localized electronic levels around the Fermi level.
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  • Teruhiko Mabuchi, Hideaki Watanabe, Ryumyo Onaka
    1987 Volume 56 Issue 6 Pages 2124-2135
    Published: June 15, 1987
    Released on J-STAGE: June 01, 2007
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    Low energy electron loss spectra of evaporated films of NaF and LiF have been measured for various primary energies, incident and scattering angles, film thicknesses and substrates. Multiple energy loss peaks were observed in every spectrum, and the loss energies were about 66 meV for LiF and 44 meV for NaF. These values are slightly below the limiting frequencies, ωs, of LiF and NiF. The energy loss is attributed to the excitations and absorption of high-frequency surface phonons of NaF and LiF films, but the loss energies are almost constant regardless of experimental conditions. This constancy of the loss energies seems to be caused by the fact that the scattering probability of low energy electrons does not fall off as q−3, where q is the momentum parallel to the surface of the excited or absorbed surface phonons.
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  • Masaru Kato, Kazushige Machida
    1987 Volume 56 Issue 6 Pages 2136-2148
    Published: June 15, 1987
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    We have demonstrated an inherent instability of unconventional anisotropic superconducting (SC) states toward the spin density wave (SDW) formation on the reason why these SC states are stabilized. Within a mean field approximation for a simplified model including the on-site repulsive and attractive interactions, we examine the competition between the SDW and various types of the p- and d-pairing states and find that to classify types of the competition, the symmetry property of the SC order parameter under translation of a nesting vector is important in addition to the symmetry of parity. We also discuss relative stability of various pairing states in the presence of the SDW. It is interpreted that the second transition observed in (U1−xThx)Be13 (x=2∼4 at%) is the SDW transition out of an unconventional pairing state.
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  • Katsuyuki Fujiwara, Kazuyoshi Ichinose, Akira Tsujimura
    1987 Volume 56 Issue 6 Pages 2149-2152
    Published: June 15, 1987
    Released on J-STAGE: May 29, 2007
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    The measurements of the magnetization and the hyperfine fields at 59Co nuclei were performed in GdCo2 and its hydrides (GdCo2Hy). The results of the magnetization measurement show that hydrogen absorption leads to a drastic reduction (46–77%) in the magnetic moment per Co atom. This reduction can be interpreted as due to two contributions. The one is an electron transfer in the direction H atom→Co atom and the other is a change of the exchange interaction on the Co atom. On the other hand, the hyperfine fields at 59Co nuclei undergo a smaller reduction (18–21%) as compared with a change in the Co moment upon hydrogen absorption. This reduction is discussed in terms of contributions of nearest neighbour Co and Gd atoms to the own Co atom.
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  • Takashi Tonegawa, Isao Harada
    1987 Volume 56 Issue 6 Pages 2153-2167
    Published: June 15, 1987
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    The ground-state properties of the one-dimensional isotropic spin-1/2 Heisenberg antiferromagnet with antiferromagnetic first- and second-neighbor exchange interactions are discussed. The ground-state energy, the singlet-triplet energy gap, the Néel correlation function, the dimer correlation function, and the magnetization are calculated exactly for finite-size systems up to 20 spins. By extrapolating these results, the values of the above quantities at the infinite-size limit are estimated. In particular, it is found that the limiting ground state is in the gapless or finite-gap phase depending on whether 0≤jjc or j>jc, where j is the ratio of the second- to the first-neighbor interaction constant and jc=0.30±0.01. Dimer long-range order does exist in the finite-gap phase and it does not in the gapless phase, while no Néel long-range order exists in both phases.
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  • Hisashi Hiramoto, Toshihiro Sekiguchi, Kenji Nakao
    1987 Volume 56 Issue 6 Pages 2168-2173
    Published: June 15, 1987
    Released on J-STAGE: June 01, 2007
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    A model calculation is performed to investigate the effect of screening on the Coulomb potential of an intercalant ion in intercalated layered materials. The 2-dimensional conduction band electrons of the host material, which have transferred from intercalants, screen the Coulomb potential. The investigation is made by using the Thomas-Fermi approximation. The spatial behavior of the screened potential is classified into three clearly distinct regimes: the regime of 1⁄r (c<<r), the rapid decreasing regime (rc) and the regime of 1⁄r3 (r>>c), where r is a distance from the intercalant and c is an interlayer distance of host materials. The existence of the rapid decreasing regime is one of the most remarkable features of our model system consisting of an intercalant and two sandwiching host layers.
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  • Seiichirou Inoue, Masatoshi Nakayama
    1987 Volume 56 Issue 6 Pages 2174-2186
    Published: June 15, 1987
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    A new type of the additional boundary condition(ABC) based on a picture of the surface scattering of exciton is proposed and applied to the oblique incidence reflectance in the case of s- and p-polarized lights. The calculated reflectance is compared with the experiment on CuCl. The spikes appeared in the reflectance spectra of the p-polarized light for the intermediate range of the angle of incidence are well reproduced by the present ABC, but by neither Pekar’s ABC, the dielectric approximation, nor the dead layer model.
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  • Kazuhiro Hara, Akikatsu Sawada, Yoshihiro Ishibashi
    1987 Volume 56 Issue 6 Pages 2187-2191
    Published: June 15, 1987
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    Pressure dependence (up to ∼80 Kbar) of optical modes in low frequency region of NdNbO4 was investigated by Raman scattering measurements at room temperature. The Raman spectra of NdNbO4 are found to be quite similar to those of isostructural LaNbO4. With increasing pressure, the overlapped peaks of the lowest frequency in NdNbO4 at atmospheric pressure, which are in the different symmetries each other, split around 30 Kbar. This behavior can be explained by the coupling of the optical mode and the order parameter x6.
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  • Yasuo Itoh, Chihiro Hamaguchi
    1987 Volume 56 Issue 6 Pages 2192-2200
    Published: June 15, 1987
    Released on J-STAGE: June 01, 2007
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    Dispersion spectra of Brillouin scattering cross sections are discussed in both opaque and transparent regions. It is found that spectral symmetry of the Brillouin scattering cross sections without exciton effect disappears when the exciton effect is taken into account. Experiments are carried out in CdS by employing reflection light scattering configuration with several lines of argon ion laser in the opaque region and by using transmission light scattering configuration in the transparent region. The observed dispersion spectrum of the Brillouin scattering cross sections shows a good agreement with the calculated curve when the exciton effect and imaginary part of resonant Brillouin scattering tensor are taken into account.
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  • Takashi Nakano, Akio Kotani, J. C. Parlebas
    1987 Volume 56 Issue 6 Pages 2201-2210
    Published: June 15, 1987
    Released on J-STAGE: May 29, 2007
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    The spectra of 3d photoemission, valence photoemission and BIS in Ce2O3 are analyzed theoretically by using the filled band Anderson model. The calculated spectra are in satisfactory agreement with experimental data by choosing appropriately the parameter values in the model. The characteristic features of these spectra are discussed in comparison with those of CeO2, for which some new analysis is also made to obtain better agreement with experimental results.
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  • Hitoshi Sumi, Atsuko Sumi
    1987 Volume 56 Issue 6 Pages 2211-2220
    Published: June 15, 1987
    Released on J-STAGE: June 01, 2007
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    Many theories have been presented so far for about thirty five years after the first discovery of the Urbach-Martienssen rule on the low energy tail of the fundamental absorption edge of a non-metallic solid. They have been subject to selection and three kinds of theories have survived now. These are a series of theories initiated by Toyozawa, the one proposed by Skettrup and the one by Dow and Redfield. Fundamental assumptions underlying these theories are critically examined, especially in the light of a reformulation with a coherent state for the third one, and problems contained in the latter two are pointed out.
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  • Norimitsu Nakaoke
    1987 Volume 56 Issue 6 Pages 2221-2222
    Published: June 15, 1987
    Released on J-STAGE: May 29, 2007
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  • Takanori Fukami, Shin Akahoshi, Kenzi Hukuda, Toshirou Yagi
    1987 Volume 56 Issue 6 Pages 2223-2224
    Published: June 15, 1987
    Released on J-STAGE: May 29, 2007
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  • Shoichi Nagata, Yoshihito Hodosawa, Satoshi Taniguchi, Kazuhiko Yamaya
    1987 Volume 56 Issue 6 Pages 2225-2226
    Published: June 15, 1987
    Released on J-STAGE: May 29, 2007
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  • Iwao Mogi, Norimichi Kojima, Ikuji Tsujikawa, Yuzuru Kanamori, Koichi ...
    1987 Volume 56 Issue 6 Pages 2227-2228
    Published: June 15, 1987
    Released on J-STAGE: May 29, 2007
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  • Shinji Hayashi, Keiichi Yamamoto
    1987 Volume 56 Issue 6 Pages 2229-2230
    Published: June 15, 1987
    Released on J-STAGE: May 29, 2007
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  • Huzio Nakano
    1987 Volume 56 Issue 6 Pages 2231
    Published: June 15, 1987
    Released on J-STAGE: June 01, 2007
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