All issues
Predecessor
- Proceedings of the Physico-Mathematical Society of Japan. 3rd Series
- Proceedings of the Tokyo Mathematico-Physical Society. 2nd Series
- Tokyo Sugaku-Butsurigakukwai Kiji-Gaiyo
- Tokyo Sugaku-Butsurigakkwai Hokoku
- Tokyo Sugaku-Butsurigaku Kwai Kiji
- Tokyo Sugaku-Butsurigaku Kwai Kiji
- Tokyo Sugaku Kaisya Zasshi
Volume 58, Issue 6
Displaying 1-50 of 51 articles from this issue
-
Jun Kondo1989 Volume 58 Issue 6 Pages 1869-1870
Published: June 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSRecent newspapers report that cold fusion of deuterons electrochemically infused into metals such as Pd has been observed by two research groups. We have made a rough estimate of the fusion rate of such deuterons on the basis of conventional solid-state physics. We take a model where deuterons are embedded into a jellium of metal electrons and interact via a screened Coulomb potential. The fusion rate depends strongly on the screening length, being larger for smaller length. For Pd metal, the length is estimated to be 0.12 Å, and even when the deuteron density in Pd is assumed to be 7×1022 cm−3, the output of fusion will be much less than that of microwatts per cubic centimeter of Pd.View full abstractDownload PDF (244K) -
Yoh Itoh1989 Volume 58 Issue 6 Pages 1871-1874
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSState-selective differential cross sections for one-electron capture processes have been measured at 0 and 3 degree angles by means of the translational spectroscopy technique. Within the scattering angle range studied, the Ar++(3p4) 3P and 1D states contribute to the one-electron capture process, whereas the 1S state does not. A spin-changing de-excitation process, 1D→3P, has also been observed with considerable intensity. This reaction is interpreted as an effect of the successive curve crossing.View full abstractDownload PDF (432K) -
Satoru Nasuno, Masaki Sano, Yasuji Sawada1989 Volume 58 Issue 6 Pages 1875-1878
Published: June 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSMacroscopic circular and spiral phase wave propagation was observed for the first time in the rectangular pattern of electrohydrodynamic convection of nematic liquid crystal. The centers of the phase wave propagation were, in general, neither defects of the rectangular structure nor external heterogeneities. The power spectrum of the transmitted light locally measured exhibited two peaks, one a corresponding phase wave mode and the other an unentrained mode. The frequency of the phase wave mode was lower than that of the other mode.View full abstractDownload PDF (772K) -
Yoshihisa Miyamoto, Yasutoshi Tanzawa, Hideki Miyaji, Hiroshi Kiho1989 Volume 58 Issue 6 Pages 1879-1882
Published: June 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe lamellar thickness of isotactic polystyrene crystallized at high supercoolings has been studied as a function of crystallization temperature and concentration. The temperature dependence of the lamellar thickness is explained by a rough surface growth model throughout the concentration range studied. The limiting thickness is found to increase with concentration. The effects of entanglement and uncrystallized cilia on the limiting thickness are discussed.View full abstractDownload PDF (656K) -
Takashi Suzuki, Toshizo Fujita1989 Volume 58 Issue 6 Pages 1883-1886
Published: June 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe crystal structure of (La1−xBax)2CuO4−δ (0≤x≤0.12) was extensively investigated by powder X-ray diffraction over a wide temperature range down to 4.2 K. A structural sequence of tetragonal-orthorhombic-tetragonal phases was found on cooling for the samples with concentrations of 0.035<x<0.10. Here a new structural phase diagram is mapped in the T-x plane.View full abstractDownload PDF (560K) -
Taiju Tsuboi, Masanori Hangyo1989 Volume 58 Issue 6 Pages 1887-1890
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSRaman spectra were investigated for BaMnF4 to find soft modes. Two low-frequency, temperature-dependent modes were observed below the incommensurate structural phase transition (Ti∼252 K). The observed level repulsion and intensity transfer are understood in terms of the anticrossing between the two modes. These are attributable to the amplitude mode (amplitudon) and hard (optical phonon) mode. From the observation of one amplitudon, it is suggested that the incommensurate distortion arises from the mode condensation at two incommensurate wave vectors.View full abstractDownload PDF (564K) -
Tsuneyoshi Nakayama, Kousuke Yakubo, Raymond Orbach1989 Volume 58 Issue 6 Pages 1891-1894
Published: June 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSSpecific realizations due to computer experiments show that fracton excitations possess a core in which the vibrational amplitudes fall off sharply at their edges. When constructing the ensemble average of the fracton wave functions, we find ⟨φfr⟩∼exp [−(r⁄Λ(ω))dφ], where Λ(ω)∼ω−0.71. The exponent, −0.71, is in close agreement with the prediction of the fracton dispersion law for a two-dimensional percolating network, −0.705, and the geometrical exponent dφ is much larger than current theoretical limits for impurity electronic states. This suggests that the two problems are different.View full abstractDownload PDF (556K) -
Mitsuyoshi Onoda, Yasuhisa Manda, Shigenori Morita, Katsumi Yoshino1989 Volume 58 Issue 6 Pages 1895-1898
Published: June 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe absorption spectrum of poly(3-alkylthiophene) such as poly(3-docosylthiophene) changes at the solid-liquid phase transition. This phenomenon can be interpreted in terms of the change of the effective conjugation length due to the existence of some twisted bonds between neighbouring thiophene rings on the polymer main chain in the liquid state. From measurements of the cyclic voltammogram in solid and liquid phases, the top of the valence band is confirmed to be located at a higher energy in the liquid state. Formation of polaronic states, even in the liquid state, has been clarified from the drastic change of absorption spectrum upon doping. A simple energy band scheme of poly(3-alkylthiophene) in the solid and liquid states is indicated.View full abstractDownload PDF (580K) -
Mika Yamane, Junichi Wakabayashi, Shinji Kawaji1989 Volume 58 Issue 6 Pages 1899-1902
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSCorrelations between the diagonal and Hall conductivities are experimentally studied in the (0↓+), (0↓−), (1↑+), (1↑−), (1↓+) and (1↓−) Landau subbands (0 and 1 refer to Landau quantum numbers, ↑ and ↓ to parallel and antiparallel spin direction to the magnetic field, respectively, + and − to the lower and higher valley, respectively) of an n-channel inversion layer on a silicon (001) surface in magnetic fields of 15 T and 14 T at temperatures between 1.5 K and 0.35 K. Results are consistent with numerical studies.View full abstractDownload PDF (400K) -
Junichi Wakabayashi, Mika Yamane, Shinji Kawaji1989 Volume 58 Issue 6 Pages 1903-1905
Published: June 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSTemperature (T) dependence of the mobility edge is examined by a model calculation which reproduces the experimental line shape of dσxy⁄dNs (σxy: Hall conductivity, Ns: electron concentration) for (0↓−) and (1↑−) Landau subbands in Si-MOS inversion layers in the range of 0.35 K≤T≤1.5 K and in a magnetic field of 15 T. The result show that the critical behaviour of localization depends on the Landau quantum number.View full abstractDownload PDF (408K) -
Ryusuke Ikeda1989 Volume 58 Issue 6 Pages 1906-1909
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe renormalized fluctuation theory of the resistive transition in high-temperature superconductors is extended to the case with a magnetic field parallel to the current. The results show broad resistive transitions analogous to those observed in the perpendicular case. It is hoped that experimental works will be carried out in a clean sample with a higher transition temperature, such as YBCO.View full abstractDownload PDF (528K) -
Guo-qing Zheng, Yoshio Kitaoka, Yasukage Oda, Kunisuke Asayama1989 Volume 58 Issue 6 Pages 1910-1913
Published: June 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSAn anomalous Cu NMR signal with extremely small e2qQ has been observed in the oxide superconductor Nd1.85Ce0.15CuO4−y. The Knight shift decreased significantly as temperature decreased below Tc. The temperature-independent T1 of 63Cu suggests that the relaxation is dominated by the fluctuation of the Nd-moment, and no magnetic order is achieved for this content of Ce.View full abstractDownload PDF (332K) -
Kazuaki Shimizu, Hiroshi Maruyama, Hitoshi Yamazaki, Hideki Watanabe1989 Volume 58 Issue 6 Pages 1914-1917
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBoth thermal expansion and magnetization measurements have been made on the same samples of FexCo1−xSi alloys with x=0.48 and 0.77 in the temperature range from 4.2 to 340 K and under magnetic fields of up to 50 kOe. Magnetic contribution to a thermal expansion coefficient was estimated by subtracting the nonmagnetic contribution expressed by Grüneisen’s equation from the observed one. It was found that the magnetic thermal expansion coefficient has a positive and approximately constant value above the Curie temperature, and that the observed magnetovolume effect of these alloys is quantitatively well explained by the spin fluctuation theory developed by Moriya and Usami.View full abstractDownload PDF (528K) -
Toshiro Takabatake, Hirofumi Kawanaka, Hironobu Fujii, Yasutoshi Yamag ...1989 Volume 58 Issue 6 Pages 1918-1921
Published: June 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSStructural, magnetic, transport and thermal properties of UPd2In with a Heusler-type structure have been investigated. The temperature variations of thermal expansion and of X-ray diffraction pattern indicate a first-order structural transition at Ts\simeq180 K. The significant change in both the magnetic susceptibility and thermoelectric power near Ts indicates that the uranium 5f electrons play an important role in the structural transition. This compound undergoes an antiferromagnetic ordering at 20 K. The extrapolated value of C⁄T, specific heat divided by temperature, is 0.20 J/K2mol at 0 K; thus UPd2In is an antiferromagnetic heavy-fermion compoundView full abstractDownload PDF (484K) -
Takeo Jo, Shin Imada1989 Volume 58 Issue 6 Pages 1922-1925
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Ce 4d-core X-ray absorption spectrum (4d XAS) of the mixed valent ferromagnet CeRh3B2 is calculated based on the impurity Anderson model incorporated with electron-electron (or core hole) interactions described by the Slater integrals. The ferromagnetic ordering is taken into account by the molecular field acting on the 4f electron of the impurity atom. The difference in the 4d XAS between the right-hand and left-hand circularly polarized incident photons is predicted to be very remarkable, even for the magnetization of ∼1 μB per Ce atom.View full abstractDownload PDF (504K) -
Hiroshi Wako1989 Volume 58 Issue 6 Pages 1926-1929
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSpectral exponents m defined in the power law relationship ρ(ν)∝νm−1 between the density of vibrational states ρ(ν) and the frequency ν at very low frequencies are calculated by means of the normal mode analysis of molecular mechanics for nine globular proteins. For the sake of comparison, fractal dimensions \bard are also estimated from the backbone conformations of the same set of proteins. The results show that m and \bard range from 1.53 to 1.77 and from 1.49 to 1.85, respectively, and well agree with the fractal model of protein conformations proposed by Stapleton et al. (Phys. Rev. Lett. 45 (1980) 1456), in which it is asserted that m is equal to \bard and \bard is close to the theoretical value 5/3 associated with a self-avoiding random walk.View full abstractDownload PDF (532K) -
Atsushi Okamura, Hidetoshi Konno1989 Volume 58 Issue 6 Pages 1930-1933
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe have studied the parametrically driven nonlinear Schrödinger equation: iψt+ψxx+2|ψ|2ψ=−iΓ0(sin ωt)ψ. It was found that: (a) as the strength of the external force Γ0 increases, the amplitude of 1 soliton exhibits the intermittent route to “chaos”; (b) when Γ0 further increases, the 1-soliton state breaks up into the 2-soliton state; this is an elementary process of the annihilation-creation of solitons.View full abstractDownload PDF (448K) -
Shinsuke Watanabe1989 Volume 58 Issue 6 Pages 1935-1943
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTwo conflicting theoretical results on modulation of a lattice wave in a nonlinear lattice where an interaction potential φ is given as a function of relative displacement r in the form φ(r)=r2⁄2−αr3⁄3+βr4⁄4 have been presented. The contradiction lies in the role of quadratic nonlinearity α on the nonlinear term of the nonlinear Schrödinger equation describing the wave. Tsurui has shown (Prog. Theor. Phys. 48 (1972) 1196) that the nonlinear modulation takes place for β>0, but the quadratic nonlinearity α stabilizes the instability. Munakata and Igarashi (J. Phys. Soc. Jpn. 53 (1984) 620), on the other hand, have asserted that the quadratic nonlinearity enhances the instability. In this paper, we present the result of a simple numerical experiment on the role of quadratic nonlinearity by exciting, from one end of a nonlinear lattice, a sinusoidal wave modulated by semi-infinite pulse, and by observing the growth or damping of modulation, Our test shows that the quadratic nonlinearity stabilizes the modulational instability.View full abstractDownload PDF (1044K) -
Takashi Yamada, Kazuhiro Nozaki1989 Volume 58 Issue 6 Pages 1944-1947
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe perturbation theory and numerical simulations show that the period of a bound state of two solitons of the nonlinear Schrödinger equation increases at each collision due to a dissipative perturbation. After some collisions, the bound state approaches to a double-pole state and practically splits into two single solitons of equal amplitude.View full abstractDownload PDF (344K) -
Yoshimasa Matsuno1989 Volume 58 Issue 6 Pages 1948-1961
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe algebraic N-soliton solution of a model equation for deep water waves presented by the author (J. Math. Phys. 29 (1988) 49) is shown to be expressed in terms of Pfaffians. It exhibits a new type of solution which has quite different characteristics in comparison with those of the well-known algebraic N-soliton solution of the Benjamin-Ono equation. It is also verified that the N-soliton solution satisfies certain quadratic identity for Pfaffians and this provides a direct proof of the solution without recource to mathematical induction.View full abstractDownload PDF (888K) -
Takayuki Abe1989 Volume 58 Issue 6 Pages 1962-1967
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA new model for phase transition defined on fractal is proposed. The model is exactly solvable and exhibits phase transition at a finite temperature. It was suggested that critical exponent of the correlation length, ν, satisfies the relation, ν(D)>ν(D′), for D<D′, where D and D′ are dimensionalities, even when the dimensionalities are not an integer. It is proposed that fractals are a powerful tool for studying critical phenomena.View full abstractDownload PDF (656K) -
Hiroyuki Ito1989 Volume 58 Issue 6 Pages 1968-1984
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe give a possible interpretation of the adaptation of the charge density waves (CDW) to the pulse fields, which is observed to be accompanied with the memory of the width of the applied pulses (Ido step memory effect). When the identical pulse fields are repeatedly applied, successive state transitions are induced among metastable states. By the numerical simulations with the use of the Fukuyama-Lee-Rice model, we have found that only the state can be a fixed point in the transitions where the sliding motion under the pulse field satisfies a certain condition. Selecting the adequate state for a fixed point, the system adapts itself to the applied pulse width so that the current response has a common regularity regardless of the pulse width.View full abstractDownload PDF (2284K) -
Hiroyuki Ito1989 Volume 58 Issue 6 Pages 1985-2003
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSContinued from our pervious paper, we give our scenario which explains the adaptation of the charge density waves (CDW) to the pulse fields. The relaxed configuration after the pulse field suffers systematic deformations compared with the starting configuration, if the sliding displacement of the CDW is not adequate for a fixed point under the applied pulse. The successive state transitions can be focused on the adequate fixed point, if a special relation is satisfied, between the deformations of configurations and the corresponding changes of the sliding velocity, in the configuration space around the fixed point. By the numerical simulation with the use of the Fukuyama-Lee-Rice model, we confirm such a negative feedback can be actually working in some regions of the configuration space.View full abstractDownload PDF (2580K) -
Kiyomi Okamoto1989 Volume 58 Issue 6 Pages 2004-2009
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe exactly calculate the long-distance asymptotic behavior of the longitudinal spin correlation R≡⟨SizSjz⟩ of the spin-1/2 dimerized XY chain at finite temperatures. The spin correlation R decays in the exponential law with the correlation length ξ(T), which decreases with the increase of T. The present results are compared with those obtained by the use of the phase Hamiltonian method.View full abstractDownload PDF (500K) -
Kazuhiro Satoh1989 Volume 58 Issue 6 Pages 2010-2021
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe cooperative behavior of a network of interacting nonlinear oscillators is investigated numerically. Such an oscillator-net serves as a phenomenological model for an endogenous circadian pacemaker in organisms. Following two types of network are examined. (1) Ordered oscillator-net: oscillators sit on the square-lattice points and interact with the nearest neighbors. (2) Random oscillator-net: each oscillator is influenced by a certain number of randomly chosen oscillators. Detailed computer experiment is made on the oscillator-net containing one hundred to one thousand oscillators. The self-entraining behavior is found to be very different in the two types of oscillator-net. The sample- and size-dependence are also studied. The relevance of the oscillator-net as a model for the circadian pacemaker is discussed.View full abstractDownload PDF (1340K) -
Hideo Tsuru1989 Volume 58 Issue 6 Pages 2022-2035
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEquilibrium equations for nematics are nonlinear coupled partial differential equations. When the director is confined on a plane and the variables depends only on the radius in cylindrical coordinates, these equations are reduced considerably. The exact solutions of the reduced equations are obtained even when the three elastic constants are different and a magnetic field exists. They are in general expressed in terms of the elliptic intergrals. The effect of boundary conditions are examined and structure transitions induced by the change of geometry of the boundary are obtained.View full abstractDownload PDF (1216K) -
Hideo Tsuru1989 Volume 58 Issue 6 Pages 2036-2048
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEquilibrium equations for nematics are nonlinear coupled partial differential equations. When the director is confined on a plane and the variables depends only on the angle in cylindrical coordinates, these equations are reduced considerably. The exact solutions of the resulting equation are obtained even when the three elastic constants are different and a magnetic field exists. They are in general expressed in terms of the elliptic intergrals. One valuedness plays an important role to determine the configuration.View full abstractDownload PDF (1172K) -
Naoyuki Amemiya, Kazuaki Takaichi, Makoto Katsurai1989 Volume 58 Issue 6 Pages 2049-2061
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe magnetic structure in coaxial-gun-sustained spheromaks has been investigated. The plasma gun has been operated with a small axial/radial bias magnetic flux as compared to the azimuthal magnetic flux produced by the discharge current. Stronger magnetic field is observed in the entrance region (ER) than in the flux conserver (FC). In both ER and FC, the magnetic structure is nearly axisymmetric. The axial magnetic field in ER is amplified up to about sixteen times as large as the bias magnetic field. This amplification is limited by the drastic change in the magnetic structure, which occurs when the discharge current becomes very large. The magnetic structure before the drastic change is interpreted with the Bessel function model. The μ estimation shows that the magnetic structure is mainly determined by the boundary geometry, not by the external magnetic flux and current.View full abstractDownload PDF (1560K) -
Ryuzo Koyama1989 Volume 58 Issue 6 Pages 2062-2069
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe persistence length of wormlike polyelectrolyte chains in the salt-free semidilute solution is calculated by the same theoretical model as the previous calculations of small-angle scattering of the solution. It is assumed that because of the strong electrostatic repulsion between the polymer segments, two monomers in different segments can not be close to each others within a distance R0. The persistence length a becomes
a=11.34(f⁄(1−f))1⁄2Cm−1⁄2 (Å) (f\lesssim1),
where f is a constant smaller than but close to unity, and Cm is the monomer concentration expressed in mol/l. This value for f=0.8–0.9 agrees with the values obtained by a recent small-angle neutron scattering experiment. The concentration dependence of the scattering curve calculated with this value agrees qualitatively with those of small-angle neutron and X-ray scattering experiments.View full abstractDownload PDF (852K) -
Kazuyuki Itoh, Akinori Hinasada, Masahiro Daiki, Eiji Nakamura1989 Volume 58 Issue 6 Pages 2070-2074
Published: June 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe modulated crystal structures of Rb2ZnCl4 are determined by using X-ray reflection data collected by an automatic four-circle diffractometer. In contrast to the disordered structure in the normal phase, the commensurate structure at 146 K is successfully determined by a harmonic vibration model with normal values of the thermal displacement of atoms. The incommensurate structure projected onto the three-dimensional section is determined at 233 K on the basis of the main reflections. The structure thus obtained has large mean-square displacements compared with the values in the other phases. This result is explained by the fact that the thermal displacement of the projection structure includes the contribution from the static modulated distortion of which amount can be evaluated from the temperature change of the mean-square atomic displacement.View full abstractDownload PDF (640K) -
Shôichi Takahashi, Shûzi Harada, Shigeru Tamaki1989 Volume 58 Issue 6 Pages 2075-2082
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe ordering process of FeNi3 alloy from its disordered state was detected by means of resistivity as a function of annealing temperature. The phase stability of the ordered state was examined by thermal analysis and its structure was also observed by X-ray diffraction. From these measurements, four processes toward the ordering were recognized, which depended on both annealing temperature and annealing time. Physical properties such as the ordered cluster size and the activation energy were evaluated, and the mechanism of ordering process was discussed.View full abstractDownload PDF (716K) -
Yoshifumi Sakamoto, Junjiro Kanamori1989 Volume 58 Issue 6 Pages 2083-2091
Published: June 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe phase diagram of the lattice gas model on a triangular net whose particles correspond to the adatoms in the reconstruction of Si and Ge (111) surfaces is calculated with a fixed particle concentration close to 1/4 by the Monte Carlo simulation with 48×48 lattice. The nearest neighbor pairs of particles are inhibited, while finite repulsive interactions are assumed for more distant pairs. The (2×2) and c(2×4) are the ordered states in the case where the second and third neighbor interactions are taken into account, while the c(2×8) state corresponding to the reconstruction of Ge(111) is obtained by including the sixth neighbor repulsive interaction. The (1×1) disordered state following the (2×2) or c(2×8) ordered state has a domain structure in a temperature range above the transition; particles within a domain keep the (2×2) type ordering. The mechanism underlying this short-range order is discussed.View full abstractDownload PDF (1108K) -
Yutaka Miyamoto, Hiroyuki Enomoto, Hajime Ozaki1989 Volume 58 Issue 6 Pages 2092-2097
Published: June 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe band edge structure of SnTe has been studied by the tunneling spectroscopy. Tunneling measurements are performed between room temperature and 140 K on the epitaxial SnTe films grown by the hot wall epitaxy method. The saddle point structure near the band edge is detected in the third derivative curve of the tunneling current vs bias voltage (d3I⁄dV3−V). The energy difference between the band edge and the saddle point in the conduction band is about 80 meV, and is in good agreement with the theory.View full abstractDownload PDF (556K) -
Christian Fretigny, Riichiro Saito, Hiroshi Kamimura1989 Volume 58 Issue 6 Pages 2098-2108
Published: June 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSEnergy band structure of graphite is calculated for the special purpose of investigating interlayer bands and related unoccupied energy bands. For this purpose we adopt the numerical basis-set DV–Xα LCAO method and in particular we take into account carbon 3s and 3p orbitals of unoccupied states as the atomic basis functions. Interlayer bands are definitely obtained by the present method. The calculated result is compared with recent experiments of angle resolved inverse photoemission and other band calculations. The agreement between them is satisfactory.View full abstractDownload PDF (1320K) -
Masaki Goda, Haruhiko Kubo1989 Volume 58 Issue 6 Pages 2109-2118
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe power law with respect to length n is studied numerically in detail mainly for the resistance r(n, E) (E: energy) averaged over subsystems (denoted by (⟨ ⟩ω) of size n of a Fibonacci lattice, ⟨r(n, E)⟩ω∝nβ+(E,n) exp {B(E)n}. The Lyapunov exponent B(E) and the mean value (⟨ ⟩l) of the exponent of power β+(E, l) have a fractal structure with respect to energy which corresponds to that of the energy spectrum. Both are energy sensitive. The possibility of finding a power law in conductivity with respect to temperature (at low temperatures) is discussed in view of a stability of both the mean value of the exponent of power ⟨β+(E, l)⟩l and the exponent of power β+(E, n, ω) for each sample ω over an energy interval kBT.View full abstractDownload PDF (1132K) -
Yoshichika \={O}nuki, Takashi Yamazaki, Isamu Ukon, Takemi Komatsubara ...1989 Volume 58 Issue 6 Pages 2119-2125
Published: June 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSWe report the temperature dependence of Hall coefficient of Pauli itinerant UIr3 and U6Fe, spin fluctuating USn3, heavy fermion compounds URu2Si2 and UCu5, and 5f localized UPd3. A variety of 5f electron behavior is well reflected in the present Hall effect.View full abstractDownload PDF (588K) -
Yoshichika \={O}nuki, Takashi Yamazaki, Takehiko Omi, Isamu Ukon, Atsu ...1989 Volume 58 Issue 6 Pages 2126-2134
Published: June 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSWe report the temperature dependence of Hall coefficient of RCu6(R: La, Ce, Pr, Nd and Sm), CexLa1−xCu6 and typical Ce compounds (CeRu2, CeSn3, CePd3, CeCu2Si2, CeAl3, CeInCu2, CeAl2, CeIn3 and CeB6) in the temperature range of 0.7 K to room temperature. The f electrons of these substances show a wide variety of behavior including Pauli itinerance, mixed valence, heavy fermion and localized moment system. These characteristics are well reflected in the Hall coefficient. The Hall coefficient of CexLa1−xCu6 at higher temperatures than 30 K is well fitted by the recent skew scattering Hall effect theory.View full abstractDownload PDF (820K) -
Toshikazu Ekino, Jun Akimitsu1989 Volume 58 Issue 6 Pages 2135-2139
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSElectron tunneling measurements have been performed on single crystals of BaPb1−xBixO3 with various values of x. The observed density of states in the superconducting state can well be described by the broadened BCS density of states proposed by Dynes et al. The ratio 2Δ/kTc increases with increasing the Bi concentration of x, suggesting the increase of electron-phonon interactions, and saturates at around x∼0.2. The values of 2Δ/kTc in the saturated region coincide with the BCS value.View full abstractDownload PDF (532K) -
Hiroyuki Oyanagi, Haruhiko Obara, Hirotaka Yamaguchi, Keizo Murata, Hi ...1989 Volume 58 Issue 6 Pages 2140-2146
Published: June 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe effect of Fe-doping on the local structure and valence states of Ba2Y(Cu1−xFex)3Oy (x<0.06, y=6.9) have been investigated by X-ray absorption fine structure (XAFS) on the Cu K and Fe K edge. The results show that (1) Fe impurities exist as 3+ ions and (2) take fourfold Cu1 sites in the lightly doped region (x<0.02); then with further doping, (3) the oxygen coordination number increases as the symmetry changes from orthorhombic to “tetragonal”, and (4) the orthorhombic ab-plane structure is retained on a microscopic scale. These results indicate that the orthorhombic-to-“tetragonal” phase transition is not induced by disordering of oxygen atoms. A possible structural model of the mechanism of doping is presented.View full abstractDownload PDF (800K) -
Jun-ichi Igarashi, Takashi Tonegawa1989 Volume 58 Issue 6 Pages 2147-2159
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSElementary excitations are studied near the Ising limit close to the degenerate point in the one-dimensional anisotropic Heisenberg antiferromagnets with up to next-nearest-neighbor interactions. Solitons in the Néel and (2,2) antiphase states and triplet-dimer excitations in the dimer state are found as propagating modes. These excitations are found to dominate the shape of the central peak in dynamical spin correlation functions, through the comparison with the numerical results by an exact diagonalization method for finite chains. The temperature dependence of the static correlation function is also discussed, and the shape is found to change gradually with increasing temperature, approaching the zero-temperature correlation function at the degenerate point.View full abstractDownload PDF (1352K) -
Tsuneaki Miyahara, Takaaki Hanyu, Hiroyoshi Ishii, Hiromichi Kataura, ...1989 Volume 58 Issue 6 Pages 2160-2166
Published: June 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe photoelectron spectra of the CuxNi1−x and AgxPd1−x alloy systems have been measured by means of a resonant photoemission technique to study the alloying effecton the valence band satellite. In the CuxNi1−x alloy system, the resonance intensity, which is defined as the area of the structure of the CIS of the 6 eV satellite normalized by Ni concentration, is found to increase with increasing Cu concentration. However, the difference intensity, which is defined as the difference between on- and off-resonance spectra normalized by Ni concentration, decreases with increasing Cu concentration. It is concluded that a valence electron transfer from the Ni 3d state to the Cu 4s state occurs upon alloying. This finding does not agree with the rigid band model, which explains the decrease in magnetic moment in terms of alloying. It is suggested that the “two-hole bound state” in the Ni or Pd atomic site is a resonant state mixed with the neighboring valence hole state in the Cu or Ag atomic site.View full abstractDownload PDF (724K) -
Takeo Takizawa, Hiroshi Ohwada, Hiroo Kato, Hirohito Fukutani1989 Volume 58 Issue 6 Pages 2167-2172
Published: June 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSReflection spectra of paratellurite were measured in the photon energy range from 2.0 to 35 eV using linearly polarized light of synchrotron radiation. Optical constants, the number of electrons contributing to the optical transitions and the dielectric loss function were obtained in terms of the Kramers-Kronig transformation for each polarization of the electric vector being parallel or perpendicular to the optical axis. It was shown that there were two major reflection bands, and, from the dielectric loss functions, the plasma resonance was expected to exist at 23 eV. An energy level diagram was presented to explain the observed spectral features, such as polarization characteristics as well as optical transition energies.View full abstractDownload PDF (656K) -
Atsuhiro Fujii1989 Volume 58 Issue 6 Pages 2173-2179
Published: June 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSBy measurements of luminescence and the Urbach tail of indirect absorption, exciton states were investigated in mixed crystals of thallous halides for a wide range of compositions. From the estimation of the steepness coefficients of the Urbach tail in TlClxBr1−x mixed crystals, the relaxed exciton state was found to change from the self-trapped state to the free state at x=0.7−0.6, consistent with the results of the emission studied before. On the other hand, the indirect excitons in TlBrxI1−x (0.3<x<1) were found, upon analysis of the emission band and the steepness coefficient of the Urbach tail, to relax always to the self-trapped states, which become shallow with increasing iodine concentration. Exciton states in mixed thallous halides are discussed together with a theoretical study on a binary mixed crystal and in relation to percolation of minority-halogen ion clusters.View full abstractDownload PDF (832K) -
Tokiko Ohata, Tetsusuke Hayashi, Shigeharu Koshino1989 Volume 58 Issue 6 Pages 2180-2187
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEmission spectra and decay times of luminescence in KI and RbI containing small amounts of Br− ions are investigated. The Br− ions induce a reduction of Ex emission in KI, but an enhancement of it in RbI. The Ex emission in KI seems to be of extrinsic origin. The luminescence center associated with the Ex emission in RbI:Br is deduced to be an STE of RbI perturbed by nearby Br− ions. The states responsible for the Ex and π emission bands in RbI are discussed in relation to the model of on- and off-center STEs.View full abstractDownload PDF (968K) -
Iwao Mogi, Masayasu Takeda, Giyu Kido, Yasuaki Nakagawa, Hikomitsu Kik ...1989 Volume 58 Issue 6 Pages 2188-2191
Published: June 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe absorption spectra of CsCoCl3 under high magnetic fields were investigated. Sublattice splittings were observed in an exciton line and its cold and hot sidebands. The magnitude of splitting of the hot band was not equal to that of the cold magnon sideband but was equal to that of the exciton line. Consequently, the hot band was ascribed to the exciton creation at a thermally excited soliton.View full abstractDownload PDF (460K) -
Takeshi Nakazawa, Hidetoshi Fujimoto, Kenji Imanishi, Kenji Taniguchi, ...1989 Volume 58 Issue 6 Pages 2192-2199
Published: June 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSPhotoreflectance and photoluminescence measurements are carried out to investigate optical properties of (GaAs)m/(AlAs)5 superlattices with m=3, 5, 7, 9 and 11 at room temperature, in order to clarify the cross over of the direct and indirect optical transition. Combining the transition energies determined from the photoreflectance measurements with the photoluminescence data, the superlattices are shown to be indirect for m<7 and direct for m>7. Energy band calculations based on the sp3s* tight-binding method are found to explain these results consistently. The lowest allowed direct transition energy obtained from the tight-binding theory agrees well with the energy gap determined from the photoreflectance measurements, whereas the lowest-lying indirect gap agrees with the photoluminescence peak energy for m<7.View full abstractDownload PDF (1044K) -
Shûzi Harada1989 Volume 58 Issue 6 Pages 2200-2206
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSInterfacial reactions of H atoms on transition metals have been studied by an electrochemical method. In the method, the current in a short circuit of a H2|0.1 N H2SO4| Metal cell and the recovery process of the electromotive force after breaking the short circuit were measured as functions of temperature. Thermodynamical quantities and the adsorption energies of H atoms on the metal surface were derived from the present measurements, and the interfacial reaction mechanism of metal-hydrogen system was discussed as functions of the physical adsorption energy of hydrogen and the work function on metal.View full abstractDownload PDF (696K) -
Youichi Murakami, Masayoshi Tajiri1989 Volume 58 Issue 6 Pages 2207-2208
Published: June 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (224K) -
Masayuki Oikawa, Takashi Karasudani, Mitsuaki Funakoshi1989 Volume 58 Issue 6 Pages 2209-2210
Published: June 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (244K) -
Taiju Tsuboi1989 Volume 58 Issue 6 Pages 2211-2212
Published: June 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (264K)