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- Proceedings of the Physico-Mathematical Society of Japan. 3rd Series
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Volume 61, Issue 6
Displaying 1-50 of 56 articles from this issue
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Iwao Hosokawa1992 Volume 61 Issue 6 Pages 1831-1833
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt is proven from the requirement of scale-similarity of multifractals that the probability of spatial distribution of a certain measure supported by a multifractal, which may be called intrinsic probability, is uniquely determined for a scale ratio tending to zero if the f-α spectrum of the multifractal is given. As a corollary, it is proven that there exists no nonlinear transformation of multifractals. Also, it is derived that intrinsic probabilities of many multifractals including multinomial generalized Cantor sets can be determined by the knowledge of intermittency exponents μ(q) (and then generalized dimensions D(q)) limited for q=nonnegative integers only.View full abstractDownload PDF (386K) -
Yusuke Nakai, Etsuo Akiba, Hajime Asano, Susumu Ikeda1992 Volume 61 Issue 6 Pages 1834-1838
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA feasibility test of a neutron Compton scattering (NCS) technique was carried out with an eV neutron spectrometer which utilized a pulsed spallation neutron source. The measured NCS spectrum from hydrogen atoms was compared with calculated values which included multiple scattering, geometrical effects and so on. A good agreement was obtained, indicating that the ground state wave function of light atoms in condensed matter can be investigated by means of the NCS technique with this type of eV neutron spectrometer.View full abstractDownload PDF (680K) -
Takeji Hashimoto, Takuji Kume1992 Volume 61 Issue 6 Pages 1839-1843
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe effects of simple shear flow on concentration fluctuations in semidilute solutions of high molecular weight polystyrene are investigated by the flow light scattering method. The shear-rate (\dotγ) dependence of scattering was found to fall into four regimes: Regime I at \dotγ<\dotγc where the scattering is that of homogeneous semidilute solutions, and Regimes II to IV at \dotγ>\dotγc, \dotγc being the critical shear rate for the shear-enhanced concentration fluctuations. In Regime II, a unique butterfly-type scattering pattern with a dark streak perpendicular to the flow direction appears. The intensity parallel to the flow increases by about 100 times with increasing \dotγ. In Regime III at higher shear rates, the intensity increase with \dotγ tends to saturate, and finally in Regime IV at even higher shear rates, the intensity further increases and the butterfly pattern changes into a two-point pattern elongated normal to the flow, with a broad intensity maximum along the flow. This pattern change is closely related to anomalies in rheological behavior.View full abstractDownload PDF (838K) -
Kiwamu Sugisaki1992 Volume 61 Issue 6 Pages 1844-1847
Published: June 15, 1992
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe toroidal plasma current is enhanced by means of plasmoid injection in toroidal Z pinch experiments. Increment of the toroidal current increases with total energy of the plasmoid, but does not depend much on the initial toroidal current. The conversion rate from plasmoid energy to electric energy is evaluated to be roughly 40%. Simple theoretical interpretation indicates that the toroidal current is enhanced through a physical process similar to that in spontaneous generation of the toroidal flux.View full abstractDownload PDF (397K) -
Masao Sugawa1992 Volume 61 Issue 6 Pages 1848-1851
Published: June 15, 1992
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSWhen Bernstein waves (B waves) are excited in a magnetized plasma, the self-interaction of B waves by nonlinear Landau damping becomes a dominant mechanism for the electron heating of bulk plasma. This heating occurs only for B waves with relatively small k⁄⁄, because the damping of the B wave itself becomes very small. This heating occurs in the relatively broad frequency range between ω⁄ωc\simeq1.5 and ω⁄ωc\simeq1.7 of B waves. For B waves with large k⁄⁄(k⁄⁄R>0.15), the fast tail electrons are generated by the quasi-linear cyclotron damping of the B wave itself. The efficiency of the generation of tail electrons is somewhat less than that for electron heating by self-interaction of B waves.View full abstractDownload PDF (544K) -
Akio Miyazaki1992 Volume 61 Issue 6 Pages 1852-1855
Published: June 15, 1992
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSOptical observation of domain structure, differential thermal analysis, dielectric and dilatometric measurements of (CH3NH3)4InCl7 have been carried out over a temperature range from 25°C to 200°C. It has been found that the crystal undergoes phase transitions at 194°C (T1) and 190°C (T2), and is ferroelastic below T1. Taking account of the strain-compatibility relations for domain boundaries, it is suggested from the result of optical observation that the crystal symmetry is mmm, 2⁄m and 2⁄m in order of descending temperature.View full abstractDownload PDF (611K) -
Shun-ichi Kobayashi, Hidenori Goto, Shingo Katsumoto1992 Volume 61 Issue 6 Pages 1856-1858
Published: June 15, 1992
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe conduction electron spin susceptibility of small metallic particles with electrons of even number vanishes at T=0. Using NMR, we observed the recovery of this anomalous susceptibility in small particles of Cu when the spin-orbit interaction is enhanced by adding Au impurities. The result is similar to what happens with magnetic impurities, although the mechanisms are substantially different.View full abstractDownload PDF (290K) -
Yasuhiro Seino, Haruhiko Ogasawara, Akio Kotani, B. T. Thole, G. Van D ...1992 Volume 61 Issue 6 Pages 1859-1862
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe investigated theoretically the Cu 2p resonance of 3d, 3p and 3s X-ray photoemission spectra (XPS) in CuO using a cluster model including multiplet coupling, crystal field and anisotropic hybridization. The spectra were calculated by taking into account the radiative transitions up to the first order and Coster-Kronig transitions up to the infinite order. The resonant enhancement is so strong that it can be used to interpret small satellite structures in both core level and valence band photoemission spectra. The influence of the configuration interaction between the 3p23d10 and 3s3d9 final states is discussed.View full abstractDownload PDF (551K) -
Tadao Kasuya1992 Volume 61 Issue 6 Pages 1863-1866
Published: June 15, 1992
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA possible origin of the unusual anomalous properties in CeNiSn is studied in detail. It is shown that the mother CeNiSn crystal has about 10% of inserted single crystals of the Kondo heavy fermion which shows unusual gap-type ordering below 20 K. The mother crystal is a valence fluctuating semimetallic material with a weak localization effect near the Fermi energy.View full abstractDownload PDF (562K) -
Fumitoshi Iga, Yoshikazu Nishihara1992 Volume 61 Issue 6 Pages 1867-1870
Published: June 15, 1992
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSTo date, CaVO3−y has been reported and believed to be one of the typical metallic oxides. From our detailed study, however, it has been found that this system shows insulating properties with stoichiometric oxygen content. This insulator phase was obtained by oxidation of as-cast single crystals. The magnetic susceptibility of this stoichiometric sample shows an antiferromagnetic like kink around 170 K.View full abstractDownload PDF (403K) -
Akinobu Kanda, Shingo Katsumoto, Fumio Komori, Shun-ichi Kobayashi1992 Volume 61 Issue 6 Pages 1871-1874
Published: June 15, 1992
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSExperimental results of one-dimensional arrays of small-area Al/AlxOy/Al tunnel junctions are presented. Single-electron tunneling oscillations (SETO’s) were observed as peaks of differential resistance in the presence of external microwaves. SETO was very pronounced when the array was longer than the single-electron soliton, suggesting that the soliton picture of the electron motion is correct. SETO disappeared when superconductivity set in.View full abstractDownload PDF (463K) -
Yasuhiro Seguchi, Takefumi Tsuboi, Takao Suzuki1992 Volume 61 Issue 6 Pages 1875-1878
Published: June 15, 1992
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSTemperature dependences of parallel and perpendicular critical fields have been measured for layered superconductors of Au/Ge. Sandwiched films with a single ultrathin Au layer ranging in thickness from 1.0 to 2.0 nm exhibit superconductivity with a large anisotropy of critical fields below 0.6∼0.8 K. For films with a Au thickness around 1.0 nm, the critical temperature is enhanced above the zero-field critical temperature by applying a parallel magnetic field. For thicker films, the enhancement of superconductivity due to magnetic field is also observed as a concave temperature dependence of squared parallel critical fields, deviating from that obtained from the Ginzburg-Landau theory.View full abstractDownload PDF (537K) -
Kazuo Hida, Satoshi Takada1992 Volume 61 Issue 6 Pages 1879-1881
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTwo possible extensions of the string order parameter originally defined for the spin-1 Heisenberg chain to the spin-1/2 alternating Heisenberg chain are examined by comparing the numerical diagonalization results of finite size systems and the variational results. It is suggested that the naive extension in which the spin-1 operator is simply replaced by the sum of two spin-1/2 operators can be regarded as the valence bond solid (VBS) order parameter while another extension proposed by Hida corresponds to the measure of the strength of the localized singlet taking the full value for the completely localized singlet state.View full abstractDownload PDF (336K) -
Hiroshi Matsukawa, Hidetoshi Fukuyama1992 Volume 61 Issue 6 Pages 1882-1885
Published: June 15, 1992
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe antiferromagnetic state of the t-J model present in the low doping region in high-Tc cuprates is studied in the mean field approximation based on the slave boson framework. It is found that there is a phase transition between localized and itinerant antiferromagnetism depending on the doping rate; the Néel temperature is that of localized spins, i.e., without the Fermi surface of spinons, in the region of very low doping, whereas above critical doping, the onset temperature of the coherent motion of spinons and holons is higher than the Néel temperature. The staggered magnetic moment near absolute zero decreases with doping due to the increasing degree of itineracy, which is consistent with various experiments.View full abstractDownload PDF (511K) -
Tetsufumi Tanamoto, Hiroshi Kohno, Hidetoshi Fukuyama1992 Volume 61 Issue 6 Pages 1886-1890
Published: June 15, 1992
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe spin fluctuations in the extended t-J model have been investigated in the slave-boson mean-field theory by extending the early work by Suzumura et al. [J. Phys. Soc. Jpn. 57 (1988) 2768] based on both uniform and singlet RVB (Resonating Valence Bond). By choosing the transfer integrals to reproduce the Fermi surface of LSCO and YBCO, which is essentially rotated by 45°, it is found that incommensurate spin fluctuations can be expected for the Fermi surface of LSCO type, whereas only commensurate ones for that of YBCO type, in agreement with experiments. Moreover, the Knight shift is shown to decrease as the temperature is lowered in the presence of the singlet RVB, while it is essentially independent of temperature in the uniform RVB state. These two cases correspond to, in our classification, Tc=60 K and Tc=90 K YBCO systems, which also agrees with the qualitative difference observed experimentally.View full abstractDownload PDF (683K) -
Kei-ichi Tainaka, Shusaku Fukazawa1992 Volume 61 Issue 6 Pages 1891-1894
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe spatial pattern in an ecosystem composed of prey and predator is studied. Under the assumption that the position of each individual is fixed, we are able to obtain a stationary pattern. Depending on environmental conditions, both species form specific patterns. In particular, when the death rate of the predator is large or small, the prey then tends to clump, while predators are evenly distributed. Moreover, we observe a paradox that even if the death rate of the predator becomes low, the number of predator decreases; predators cannot easily catch prey because of their clumping behaviour. Such a paradox is never explained by mean-field approximation.View full abstractDownload PDF (525K) -
Minoru Saito1992 Volume 61 Issue 6 Pages 1895-1898
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe patterns of chaotic oscillations of a Millipore membrane infiltrated with dioleyl phosphate are changed by chemical substances or light. We regarded the membrane as a system of globally coupled neuron models and examined the behavior of the system. As a result, the oscillation of each element becomes disordered or ordered according to the changes of parameters of the system. This result suggests that the changes of chaotic oscillation patterns of the membrane can be attributed to the changes of parameters of the system due to chemical substances or light.View full abstractDownload PDF (356K) -
Ryuzo Koyama1992 Volume 61 Issue 6 Pages 1899-1902
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe electrostatic persistence length of wormlike polyelectrolyte in a salt-free solution is calculated using its molecular scattering factor in a more accurate form than in the previous paper. The calculated persistence length becomes
a=6−1R0f⁄(1−f) (0<<f<1),
where R0 is a distance within which two monomers of different molecular segments are assumed not to be close to each others owing to the strong electrostatic repulsion between the segments, and f is a constant smaller than unity but close to it. When the value 1−f is very small compared with unity, and is neglected, this result coincides with that obtained in another paper considering the excluded volume effect.View full abstractDownload PDF (396K) -
Taro Nagao, Miki Wadati1992 Volume 61 Issue 6 Pages 1903-1909
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDyson’s circular ensembles of random matrices have been successfully applied to account for the statistical properties of complex spectra. We present an integration method on generalized circular ensembles. In order to express the correlation functions of unitary ensembles, Szegö’s orthogonal polynomials on the unit circle are used. Further, we introduce skew orthogonal polynomials on the unit circle to derive the correlation functions of orthogonal and symplectic ensembles.View full abstractDownload PDF (568K) -
Taro Nagao, Miki Wadati1992 Volume 61 Issue 6 Pages 1910-1918
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSCorrelation functions of self-dual quaternion random matrices related to classical orthogonal polynomials are presented. The local correlation functions for the Legendre, Gaussian and Laguerre ensembles are evaluated and the universality, independence of the ensembles, is observed.View full abstractDownload PDF (669K) -
Hiroshi Orihara, Yoshihiro Ishibashi1992 Volume 61 Issue 6 Pages 1919-1925
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Kolmogorov-Avrami-type formulation for both the latent nucleation (inhomogeneous) and the random nucleation (homogeneous) cases is presented for finite systems. In finite systems, there appear three time regimes. For the latent nucleus case the fraction of transformed regions remains as 1−e−NV (N: density of nuclei, V: system volume) and for the random nucleation case it approaches unity in the time dependence as 1−Ae−JVt (A: constant, J: nucleation rate). The growth rate in finite systems is always smaller than that in infinite systems. We present the numerical results of one-dimensional system as an example.View full abstractDownload PDF (660K) -
Hidetoshi Suemitsu, Hiroaki Imanishi, Hideo Kato1992 Volume 61 Issue 6 Pages 1926-1932
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe relative production rates of K+ and K2+ ions through the multiphoton ionization of K2 are measured in the wavelength range 600–670 nm. These rates for K2+ ions have a threshold at about 600 nm and a broad peak at about 620 nm. These for K+ ions have the threshold at about 612 nm and the position of the peak is roughly equal to that of K2+ ion. The effective order of nonlinearity k, which is the minimum number of photons necessary to ionize the K2 molecule, is measured as a function of the wavelength. k for K+ ions is about 3 in 613–650 nm, except for that at 634 nm, at which k is about 2.3. On the other hand, k for K2+ is about 2 in the wavelength range shorter than 611 nm and two values of k in 632–637 nm are about 1.6. Beyond 637 nm, k increases with an increase of wavelength and reaches about 2.6 at 650 nm. From these results, the production processes of K+ and K2+ ions are discussed.View full abstractDownload PDF (819K) -
K. N. Pandey, U. S. Tiwari, D. N. Tripathi1992 Volume 61 Issue 6 Pages 1933-1938
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSL-shell/subshell ionization cross sections and their ratios for Dysprosium (Dy) and Ytterbium (Yb) atoms due to 0.1–2 MeV proton and deuteron impact have been calculated using the PWBA theory with the exact limits of integration for energy and momentum transfers. Cross section ratios curves regarding the L2 and L3 subshells viz; (σL2⁄σL3) are found to show oscillations in the low energy region (<1.0 MeV).View full abstractDownload PDF (539K) -
Y. C. Yu, E. K. Lin, C. W. Wang, Y. M. Huang, C. H. Lee1992 Volume 61 Issue 6 Pages 1939-1945
Published: June 15, 1992
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe K X-ray production cross sections have been measured for Se, Br, Rb and Y (in the atomic number range Z=34–39) using 1.5–9.0 MeV 3He ions as incident beams. Results of the measurements are compared to the predictions of the first Born and ECPSSR ionization theories using single-hole fluorescence yield. The ECPSSR theory was found to be in better agreement with the measurements than the first Born theory. From observed data we also extracted the Kβ-to-Kα X-ray intensity ratios and compared these values with those obtained previously by others.View full abstractDownload PDF (758K) -
Hiroto Kikuchi, Hideo Suzuki1992 Volume 61 Issue 6 Pages 1946-1959
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAssuming that the stretching-vibrational energy of rhodopsin chromophore dissipates to the protein moiety during the photoisomerization, we consider the deformed excited state Ψ2 and the virtual ground state Ψ1 of the π-electron system. We also consider the normal vibrational states {Urj} of the stretching and torsional vibrations in these transient π-electronic states {Ψr}. The non-stationary state of the chromophore is then expressed as a linear combination of {ΨrUrj}, and the equation for its coefficients is derived by explicitly taking account of the kinetic energy of atomic cores. On this basis, the probability of the non-adiabatic transition from Ψ2 to Ψ1 is calculated as a function of the angle of cis-trans isomerization, as well as the energy dissipation from the chromophore to confirm the reasonability of our proposition of {Ψr}.View full abstractDownload PDF (1556K) -
Shigeo Sasaki1992 Volume 61 Issue 6 Pages 1960-1963
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMolecular weight dependence of drag reduction behaviors of xanthan polysacharide and sodium polyacrylicacid solutions is observed. The relation of δ∝Cp0.75×M3.35 is obtained between the molecular weight (M) of the polymer and the friction factor relation of 1⁄\sqrtf=4.0·log (Re·\sqrtf)−0.4+δ, where f, Re and δ are a Fanning friction factor, a Reynolds number and a constant, respectively.View full abstractDownload PDF (477K) -
Youichi Murakami, Toshiyuki Ohkita, Kanefusa Gotoh1992 Volume 61 Issue 6 Pages 1964-1968
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSStatic deformation of the free surface is investigated for a thin magnetic fluid layer under axisymmetric magnetic field. Special attention is paid to the case that the effect of the surface tension is much larger than that of the gravity (i.e. the Bond number, Bo is very small). It is shown analytically that in the limit Bo→0 the tail of the elevation of the surface decreases as −log r away in the radial direction as r→∞, irrespective of the form of the applied field. Numerical calculations for the case of the dipole field sustain the asymptotic result.View full abstractDownload PDF (593K) -
Roberto A. Clemente, Pablo Martín1992 Volume 61 Issue 6 Pages 1969-1972
Published: June 15, 1992
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSAn exact analytical solution for Te=Ti and an approximate solution for Te≠Ti have been obtained for the unidimensional non-linear Debye potential. The approximate expression is a solution of the Poisson equation obtained by expanding up to third order the Boltzmann’s factors. The analysis shows that the effective Debye screening length can be quite different from the usual Debye length, when the potential to thermal energy ratio of the particles is not much smaller than unity.View full abstractDownload PDF (385K) -
Masahiro Nakagawa, Hajime Namikata1992 Volume 61 Issue 6 Pages 1973-1978
Published: June 15, 1992
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA diffusion-limited aggregation (DLA) model with elongated, or needle-like, particles is proposed. Such a particle freely rotates as it randomly moves as a Brownian particle. Here the particle lengths are assumed to follow a power distribution as ∼L−DL−1 similar to the Levy’s flight model to assure the self-similarity of the system. From the present simulation results, the fractal dimensions of the aggregation clusters are found to increase with the increasing power exponent DL and to result in that of the ordinary DLA cluster as DL→∞.View full abstractDownload PDF (589K) -
K. Elankumaran, G. Markandeyulu, K. V. S. Rama Rao1992 Volume 61 Issue 6 Pages 1979-1983
Published: June 15, 1992
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSX-ray diffraction studies carried out on MnCoxSb system revealed that the limiting value of single phase NiAs type crystal structure formation exists upto x=0.25. The variation of lattice parameters ‘a’ and ‘c’, magnetization and Curie temperature with increasing Co concentration suggests that the excess Co atoms carry magnetic moment and occupy the interstitial sites. The figure of merit evaluated from the Faraday rotation and the optical absorption coefficient at 6328 Å was found to decrease with the increase of Co concentration.View full abstractDownload PDF (570K) -
Toshiji Kanaya, Keisuke Kaji, Kazuhiko Inoue, Susumu Ikeda, Kaoru Shib ...1992 Volume 61 Issue 6 Pages 1984-1991
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe have recently developed a high resolution quasielastic neutron scattering spectrometer LAM-80ET by applying mica crystals as analyzers and achieved a resolution of Δε=1.3 μeV using the 002 reflection. Single chain dynamics of polyethylene has been investigated below and above the melting temperature Tm (=135°C) to show the feasibility of the mica 002 reflection as the analyzer. It was found that elastic scattering intensity from polyethylene decreases very steeply around the Tm. Quasielastic broadening in the spectrum at Q=0.082 Å−1 is observed only above 210°C, which is 75°C higher than the Tm. From the analysis of the spectra by a curve-fitting method, the width of the quasielastic component was evaluated to be 1.8 μeV at 250°C and the activation energy of the width to be 34 kJ/mol.View full abstractDownload PDF (1036K) -
R. L. Moreira, R. P. S. M. Lobo1992 Volume 61 Issue 6 Pages 1992-1995
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSUsing Landau-Devonshire’s theory for microregions of a material presenting a diffuse ferroelectric phase transition we have obtained the smeared behaviour of its dielectric permittivity. This generalization of the classical phenomenological theory contains the Smolensky-Isupov’s behaviour near the dielectric maximum. It is also shown that the temperature dependence of the reciprocal dielectric susceptibility, above the dielectric constant peak, is actually quadratic near it and gradually reaches a Curie-Weiss linear behaviour, after all the material has become paraelectric.View full abstractDownload PDF (497K) -
Kouichi Sakamoto, Yoshimi Tsuchiya1992 Volume 61 Issue 6 Pages 1996-2001
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMelting enthalpy and molar volume in the molten state of the pseudo-binary In2(Se1−xTex)3 system have been measured to investigate structural changes in the liquid. The melting enthalpy as a function of Te fraction shows a point of inflexion around x=0.75. Corresponding variation has been found in the isotherm of the molar volume and the thermal expansion coefficient in the liquid state. It has been shown that the melting enthalpy is influenced by the structural changes in the liquid.View full abstractDownload PDF (671K) -
Tadao Ishii1992 Volume 61 Issue 6 Pages 2002-2006
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe gate model is proposed such that a mobile ion happens to hop between adjacent sites only when immobile (gate) ions probabilistically move away to keep an enough space: By taking account of hard-sphere ions vibrating around their stable sites, the transition probability rate Γ is statistical-mechanically evaluated according to the Vineyard method. The obtained Γ is of activation-type where the activation energy increases with the overlap length defined with radii of mobile and immobile ions, and also increases with the gate frequency.View full abstractDownload PDF (558K) -
Makoto Tsubota, Susumu Maekawa1992 Volume 61 Issue 6 Pages 2007-2017
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThree-dimensional dynamics of two interacting quantized vortex filaments is studied. The equations of motion and the method of numerical calculation follow Schwarz. The present paper describes when and how two filaments approach to reconnect; the obtained results differ from the assumption Schwarz used in the simulation of vortex tangle. Whether two approaching filaments reconnect or not depends on their arrangement before approach. When a ring moves toward a line from a distance, for example, there is a critical initial distance only within which they can reconnect. The critical distance is minimized when their circulations are parallel at the closest place, while it increases as their circulations become to deviate from being parallel. In such a symmetrical case as collision of two same rings, they can make some extensive twists on themselves to reconnect. Our results are compared with the numerical simulation by Schwarz.View full abstractDownload PDF (1176K) -
Kazutoshi Fukui1992 Volume 61 Issue 6 Pages 2018-2026
Published: June 15, 1992
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSAbsorption spectra of polycrystalline and amorphous thin films of SnTe and PbTe have been measured around the Sn 4d, Pb 5d and Te 4d absorption edges and total photoelectron yield spectra of p- and n-type SnTe polycrystals, around the Te 4d absorption edge. In both phases, the Sn 4d and Pb 5d absorptions show doublet peaks due to the excitonic transitions, while the Te 4d absorption shows broad structures reflecting the density of states of the conduction band. The doublet peaks in the crystalline phases are explained in an atomic picture. A small peak found below the broad structures of the Te 4d absorption in c-SnTe thin films and p-SnTe polycrystals, is attributed to the transition from the Te 4d level to the hole state located near the top of the valence band.View full abstractDownload PDF (1151K) -
Masahiko Ichimura, Mitsutaka Fujita, Kenji Nakao1992 Volume 61 Issue 6 Pages 2027-2039
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFor a wide range of electron filling we study the spin density wave states in the Hubbard model on a square lattice within a Hartree-Fock approximation. It is shown that the incommensurate helical spin density wave states appear for whole region of the electron filling and, especially, that the commensurate helical spin density wave state with wave vector (π, 0) is stable near the quarter-filling. We examine also the relative stability of the soliton and the vortex lattice states to the helical spin density wave states and obtain the results that near the half-filling case the soliton lattice states are stable states for intermediate interaction strength and that the vortex lattice states do not appear as the stable state, except one particular state with the wind-mill spin structure at the quarter-filling.View full abstractDownload PDF (1527K) -
Arata Tanaka, Takeo Jo1992 Volume 61 Issue 6 Pages 2040-2047
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe temperature dependence of the V and Co 2p-core X-ray absorption spectra (2p XAS) in VF3 and CoF2, respectively, are discussed on the basis of an atomic model including multiplet-splitting, 3d spin-orbit interaction and crystalline field. The recent high-resolution 2p XAS data for VF3 and CoF2 are shown to be well explained by assuming the crystalline field with cubic symmetry in the former and with the orthorhombic (D2h) symmetry in the latter and by assuming T=300 K for both systems. For CoF2, the temperature dependence of the Co 2p XAS for the linearly polarized incident beams both parallel and perpendicular to the c axis is predicted to be much more remarkable than that for unpolarized light.View full abstractDownload PDF (874K) -
Nobuo Furukawa, Masatoshi Imada1992 Volume 61 Issue 6 Pages 2048-2055
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSpin-fermion model on a square lattice is investigated in the perturbation expansion in terms of the spin-fermion Kondo coupling. The fermion self-energy is calculated in a self-consistent treatment by a dominant pole approximation. The quasi-particle excitation of a doped fermion turns out to be totally incoherent. It suggests that the low energy excitations should be described by the bound state of a fermion and spins as a collective mode and imply that the fixed point of the spin-fermion model with a single fermion is the t-J model. It also suggests the spin-charge separation of the low energy excitations in the light doping region of these two models.View full abstractDownload PDF (931K) -
Yasuhiro Hatsugai, Mahito Kohmoto1992 Volume 61 Issue 6 Pages 2056-2069
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe present an exactly solvable Hamiltonian which consists of nearest neighbor hopping and long-range interaction. The ground state and the thermodynamic quantities are analytically obtained in any dimensions. In a repulsive case, the Luttinger’s theorem breaks down and the hypothesis of the adiabatic continuation no longer holds. At half filling, we show the existence of a metal-insulator transition as a function of the strength of the interaction. The zero energy excitation disappears at the critical value of the interaction when we increase the interaction. In this case, the system is an insulator. The charge compressibility behaves as κ≈|1−ρ|1−2⁄d near half filling in d dimensions where ρ is the density of electrons. At other fillings, there is always a zero energy excitation and the system is metallic. When the interaction is attractive, the ground state is composed of pairs of electrons with opposite spins. The low energy excitations, however, is not a particle-hole type of a non-interacting case but a pairwise excitation across the Fermi surface.View full abstractDownload PDF (1347K) -
Masukazu Igarashi, Kazukiyo Nagata1992 Volume 61 Issue 6 Pages 2070-2080
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA simple but useful phenomenological approach to the magnetism of a randomly mixed antiferromagnet B1−xCx, in which a weak axial anisotropy of B-ions and a strong axial anisotropy of C-ions compete each other below a terminal concentration xs (<<1), is proposed. This approach is based on a two-sublattice model including angular variation of the sublattice magnetizations. The angular variation is induced by the local disarray of spin alignment and gives rise to the fourth-order anisotropy terms in the free energy. From this model, the concentration vs. external magnetic field (x-H) phase diagram for the random mixture is derived, which consists of four phases, namely, the paramagnetic phase, the antiferromagnetic phase, the field induced intermediate (or oblique antiferromagnetic:OAF) phase, and the spin flop phase. The magnetic resonance frequencies and the magnetization process are also derived.View full abstractDownload PDF (1059K) -
Masukazu Igarashi, Yuichi Tazuke, Kazukiyo Nagata1992 Volume 61 Issue 6 Pages 2081-2089
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe magnetic resonance and magnetization measurements in the random system with competing spin anisotropies CsMn1−xCoxCl3·2H2O (x<0.1) have been conducted at liquid helium temperatures to confirm the validity of the new phenomenological approach proposed in the preceding paper I. The model is a two-sublattice one including angular variation of the sublattice moments induced by the local disarray of spin alignment. The experimental results are well reproduced by the simple model. From the resonance and magnetization data, the concentration-field (x-H) phase diagram and the x dependence of the resonance constants (C1 and F1) have been derived. Using these results, the angular dependent part of the sublattice moments and their x-dependence have also been estimated.View full abstractDownload PDF (1040K) -
Masao Doi, Howard T. See1992 Volume 61 Issue 6 Pages 2090-2098
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSRecent experiments of Shimada have shown that under a constant magnetic field, a colloidal suspension of magnetic particles exhibits a magnetic relaxation which depends on the viscosity of the solvent even if the reorientation of the magnetic moment in each particle is considered to take place very fast. This phenomena is explained using the assumption that the particles form a chain-like cluster. It is shown that even if the reorientation process of the magnetic moment is very fast, the dipole-dipole interaction between the particles causes a relaxation process which depends on the solvent viscosity.View full abstractDownload PDF (809K) -
Kentaro Kyuno, Ryoichi Yamamoto, Setsuro Asano1992 Volume 61 Issue 6 Pages 2099-2103
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe magnetocrystalline anisotropy energies of X(2ML)/Co(1ML) (ML: monolayer) (X=Pd, Pt, Cu, Ag, Au) multilayers have been calculated from first principles within the local-spin-density approximation using the linear muffin-tin orbitals method. The easy axis of Pd/Co, Pt/Co and Au/Co are found to be perpendicular to the film plane, which are in good agreement with experiments.View full abstractDownload PDF (614K) -
Takao Ebihara, Izuru Umehara, Ariane Keiko Albessard, Yutaka Fujimaki, ...1992 Volume 61 Issue 6 Pages 2104-2108
Published: June 15, 1992
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSWe have measured the de Haas-van Alphen (dHvA) effect for the antiferromagnetic compound SmIn3. The Fermi surfaces of SmIn3 are roughly similar to those of the non-4f reference compound LaIn3, although they are modified in topology by the magnetic Brillouin zone. The cyclotron masses are in the range of 0.2 m0 to 1.3 m0, which are twice or three times larger than those of LaIn3.View full abstractDownload PDF (521K) -
Toshinobu Tsuda, Takashi Ohno, Hiroshi Yasuoka1992 Volume 61 Issue 6 Pages 2109-2113
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe have made the measurements of the temperature dependence of the nuclear spin-lattice relaxation rate 1⁄T1 of 63Cu in La2CuO4, YBa2Cu3O6 and CuO. At 4.2 K, 1⁄T1 of La2CuO4, YBa2Cu3O6 and CuO are about 5×104 sec−1, 5×103 sec−1 and 3×10−3 sec−1 respectively. The sharp temperature dependence of 1⁄T1 has been observed in CuO, while in La2CuO4 1⁄T1 has exhibited a T2∼3 dependence below 4.2 K and has become nearly temperature independent above 4.2 K. In YBa2Cu3O6 1⁄T1 has exhibited a weak temperature dependence with nearly T2⁄3 dependence. The observed behaviors in CuO are in general accord with the theoretical prediction based on the spin wave picture if we take its low dimensional nature into account while those in other two compounds are not consistent with the theoretical prediction.View full abstractDownload PDF (541K) -
Kenro Nakamura, Wataru Kinase1992 Volume 61 Issue 6 Pages 2114-2128
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe ferroelectric-paraelectric phase transition in BaTiO3 is discussed quantitatively from the microscopic free energy based upon the statistical method of the mean field approximation, where only the Ti ions situated at the center of the lattice are assumed to have the spontaneous shift. It is shown that the result of the “first order” phase transition is obtained if the effect of the spontaneous lattice deformation is taken into account in a proper way when making the potential acting on the Ti ions. Moreover it is shown that this microscopic free energy can be translated to the macroscopic free energy based upon the phenomenological theory. Through the comparison between these two types of free energies it is possible to understand better the mechanism of the ferroelectric-paraelectric phase transition.View full abstractDownload PDF (1569K) -
Sang Ho Sohn, Yoshihiro Hamakawa1992 Volume 61 Issue 6 Pages 2129-2133
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA theoretical estimate for the electronic polarizabilities of isoelectronic impurities in II–VI compounds has been made in the frame of Ruffa’s theory. By a new analysis of the crystal ionization energy and the mean excitation energy of isoelectronic impurities, Ruffa’s theory for the electronic polarizabilities of alkali halides yields useful results for those of isoelectronic impurities in II–VI compounds. The estimated results show a large deviation from the additivity rule and a fluctuation in the electronic polarizabilities of any given impurities in the different crystalline environments.View full abstractDownload PDF (661K) -
Kazuo Gesi, Masaaki Takashige1992 Volume 61 Issue 6 Pages 2134-2140
Published: June 15, 1992
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe effect of hydrostatic pressure on phase transitions has been studied by dielectric measurements for acetate-substituted dicalcium strontium propionate, Ca2Sr[(C2H5COO)1−x(CH3COO)x]6 with x=0.045, 0.10, 0.14. The I–II and II–III transition temperatures of x=0.045 crystal (256 K and 120 K at 0 MPa, respectively) increase linearly with increasing pressure. The ferroelectric II phase of x=0.10 crystal narrows with application of pressure and disappears at 110 MPa. In the x=0.14 crystal, which does not show ferroelectricity, the temperature at which the dielectric constant shows a broad maximum increases with increasing pressure. The pressure dependence of the peak value εmax is expressed by εmax=ε0+C⁄(p−pc) where C=225 MPa and pc=−27 MPa. There is a parallelism between the effects of hydrostatic pressure and acetate-substitution on the phase transitions.View full abstractDownload PDF (722K) -
Yasuhiro Ono, Tomoyuki Hikita1992 Volume 61 Issue 6 Pages 2141-2146
Published: June 15, 1992
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPhase transitions of mixed crystals (NH4)2(BeF4)1−x(SO4)x have been investigated by means of dielectric measurements and X-ray diffraction. The phase transition scheme clearly devides the phase diagram into two regions. One is (NH4)2BeF4 rich region (x≤0.33) where the crystals undergo a successive phase transitions (paraelectric-incommensurate and incommensurate-ferroelectric), the same as that of (NH4)2-BeF4. The other one is (NH4)2SO4 rich region (x≥0.51) where the crystals undergo only one phase transition (paraelectric-ferroelectric) as in the crystal (NH4)2SO4. Neither a P212121 phase nor a glass-like state which was reported in the earlier papers is confirmed in the present work.View full abstractDownload PDF (563K)