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 59, Issue 10
Displaying 1-50 of 60 articles from this issue
-
Junta Matsukidaira, Junkichi Satsuma1990 Volume 59 Issue 10 Pages 3413-3416
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAn exactly solvable four-dimensional lattice system is presented. The system is derived from a trilinear equation by applying dependent variable transformation, and its solutions can be expressed by a two-directional Casorati determinant. Higher-order equations are also discussed.View full abstractDownload PDF (280K) -
Kimiaki Konno1990 Volume 59 Issue 10 Pages 3417-3418
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe relationship among a modified WKI equation, the equation of motion of a thin vortex filament and that of a continuous Heisenberg spin system is studied.View full abstractDownload PDF (224K) -
David A. Noever1990 Volume 59 Issue 10 Pages 3419-3422
Published: October 15, 1990
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSShallow cultures of the motile algal strain, Euglena gracilis, were concentrated to 2×106 organisms per ml and placed in constant temperature water baths at 24 and 38 C. Bioconvective patterns formed an open two-dimensional structure with random branches, similar to clusters encountered in the diffusion-limited aggregation (DLA) model. When averaged over several example cultures, the pattern was found to have no natural length scale, self-similar branching and a fractal dimension (d∼1.7). These agree well with the two-dimensional DLA.View full abstractDownload PDF (524K) -
Akira Onuki1990 Volume 59 Issue 10 Pages 3423-3426
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe present fundamental dynamic equations describing collective diffusive motions of deformed polymers. If we incorporate Doi’s recent idea on the polymer diffusion in flow, the equations turn out to be different from those previously proposed by the present author (Phys. Rev. Lett. 62 (1989) 2472). In the absence of flow, on the other hand, they are consistent with a theory of Brochard and de Gennes. A seriously ambiguous assumption in the derivation remains.View full abstractDownload PDF (504K) -
Akira Onuki1990 Volume 59 Issue 10 Pages 3427-3430
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe examine spinodal decomposition induced in sheared semidilute polymer solutions which were stable in quiescent states. We find a transverse elastic force acting on polymers. It causes a diffusive flux of polymers from lower to higher concentration regions in mechanical equilibrium. This mechanism can also explain formation of a slipping layer in capillary flows. The scattering amplidue is also calculated in weak shear.View full abstractDownload PDF (504K) -
Sanae-I. Itoh1990 Volume 59 Issue 10 Pages 3431-3434
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA model theory of inward pinch and peaked density profile of ohmic discharges in the tokamak is presented. Ion anomalous viscosity in the presence of sheared rotation causes the drift across the magnetic field. Radial electric field, Er, can cause an inward pinch of electrons as well. The ratio of viscosities and the diffusion coefficient, the Prandtl number, determines the structures of Er and the density profile n(r) in a stationary state. In viscous plasmas, peaked profiles of both density and rotation velocity are expected. Reduction of edge neutrals changes the boundary condition and can induce further density peaking. Change of dEr⁄dr propagates into the center, causing ion viscous heating associated with the damping of velocity shear.View full abstractDownload PDF (624K) -
Susumu Takeda1990 Volume 59 Issue 10 Pages 3435-3438
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe swarm parameters related to electrons and ions, when they move in gases, are calculated as a function of E⁄p, where E and p are the electric field and the pressure. The plasma parameters as a function of the electron temperature, Te, cannot be simply deduced from swarm parameters, because the energy distribution function is quite different in both cases. Some examples calculated on the basis of the relation between E⁄p and Te show considerable differences in both parameters.View full abstractDownload PDF (388K) -
Takashi Yabe, Takayasu Mochizuki, Takayuki Aoki, Takashi Fujimoto1990 Volume 59 Issue 10 Pages 3439-3442
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSRadiative and collisional atomic processes are proven to be affected critically by the shape of the free electron distribution. For a bi-Maxwellian distribution with temperatures Tx and T⊥ for the motions in the x and the perpendicular directions, the radiative recombination rate is enhanced by a factor of ten for T⊥⁄Tx=0.1 and becomes infinite in the limit of T⊥⁄Tx=0. This enhancement can largely increase the gain in recombination X-ray lasers. With the aid of applied magnetic fields, this temperature anisotropy can easily be created. Possible applications to laser-produced plasmas and magnetically confined plasmas such as in tandem mirror devices are discussed.View full abstractDownload PDF (568K) -
Yoshiya Uwatoko, Hikaru Okita, Gendo Oomi, Izuru Umehara, Yoshichika \ ...1990 Volume 59 Issue 10 Pages 3443-3446
Published: October 15, 1990
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThermal expansions of CeCu2 and YCu2 single crystals have been measured in the temperature range from 2.0 K to 300 K. It is found that the linear thermal expansion coefficients αi (i=a, b and c) of CeCu2 are strongly anisotropic among each crystal axis reflecting orthorhombic crystal structure. A well-defined anomaly due to antiferromagnetic ordering is observed near 3.5 K in the αi-T curves of CeCu2. A magnetic contribution to αi(T) due to the 4f electron is estimated by comparing the αi-T curve of CeCu2 with that of YCu2.View full abstractDownload PDF (408K) -
Takashi Nagatani, Francesc Sagués1990 Volume 59 Issue 10 Pages 3447-3450
Published: October 15, 1990
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe effect of the rotating flow upon the diffusion-limited aggregation (DLA) is investigated by using a Monte Carlo model. The growth process is governed by the rotating flow and the diffusion. The convective diffusion field is simulated by the biased-random walker. With varying direction and strength of the rotating flow, distinct morphologies develop. By introducing a tangential flow, the diffusion-limited aggregation changes into a single arm which is oppositely vortical to the tangential flow. In the case of both radial and tangential flows, the DLA pattern changes into a multiarm structure.View full abstractDownload PDF (516K) -
Hiroshi Matsui, Terutaka Goto, Tadao Fujimura, Yoshichika \={O}nuki, T ...1990 Volume 59 Issue 10 Pages 3451-3454
Published: October 15, 1990
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSWe measured the temperature dependences of elastic constants of the heavy fermion compound CeInCu2 and the reference compound LaInCu2. The transverse C44 and (C11-C12)/2 modes in CeInCu2 exhibit monotonous temperature dependences. The bulk modulus CB, however, shows an anomalous softening of 6% below 130 K, which is in contrast to the normal behavior in LaInCu2. The anomalies of CB in CeInCu2 indicate the coupling between the volume strain and the heavy fermion state with a large electronic Grüneisen constant Ωg\simeq50 at 5 K.View full abstractDownload PDF (500K) -
Kenji Shiraishi1990 Volume 59 Issue 10 Pages 3455-3458
Published: October 15, 1990
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA new slab model approach is examined for the electronic structure calculation of a polar semiconductor surface. Our proposed slab model contains fractionally charged H atoms which completely terminate a noninteresting surface of the slab. We have studied in detail the electronic structure of the polar GaAs(001) surface in order to examine the reliability of our slab model. Calculation is performed by the ab initio pseudopotential method. We have found that our slab model can accurately describe a polar semiconductor surface. In addition, this model can greatly reduce the computational time.View full abstractDownload PDF (528K) -
Kenji Fujiwara, Yoshio Kitaoka, Kunisuke Asayama, Yuichi Shimakawa, Ta ...1990 Volume 59 Issue 10 Pages 3459-3462
Published: October 15, 1990
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESS63Cu Knight shift in Tl2Ba2CuO6+y with a single CuO2 plane has been measured by using a partially oriented powder with the c-axis perpendicular to the external field (Kab). For the compounds with Tc=72 K and 40 K, Kab exclusively connected to the spin susceptibility (χs) is T-independent above Tc, while it decreases rapidly below Tc. By taking into account the T-independent orbital shift of Korb=0.24% and 0.26%, respectively, χs(T) is found to become almost zero below T⁄Tc=0.3, in good agreemt with the isotropic energy gap (s-wave) model with a larger energy gap (2Δ=4.4kBTc) than the BCS value (2Δ=3.5kBTc). For the nonsuperconducting Tl2Ba2CuO6+y, Kab(χs) exhibits no T-variation, which is different from the behavior observed in other high-Tc oxides except YBa2Cu3O7.View full abstractDownload PDF (544K) -
Yutaka Itoh, Hiroshi Yasuoka, Yutaka Ueda1990 Volume 59 Issue 10 Pages 3463-3466
Published: October 15, 1990
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSWe have measured the transverse relaxation of the planar Cu(2) nuclear spins in an oriented powder sample of YBa2Cu3O6.98 (Tc=92 K) by using the nuclear quadrupole resonance (NQR) technique. Above Tc, after subtraction of the Tl process, the spin echo envelope decay follows a Gaussian form, and its time constant is almost independent of temperature. In the vicinity of Tc, however, the Gaussian line shape is gradually narrowed. The calculated value (TG=149 μsec) for the Gaussian time constant based on the direct nuclear dipole-dipole interaction is comparable to the experimental one (TG=131±2 μsec) at 297 K. Hence, the nuclear indirect coupling proposed previously may not be needed. Below Tc, the Gaussian line shape was found to be narrowed depending on Hl, and especially, it is sharply narrowed at 35 K and 87 K.View full abstractDownload PDF (564K) -
Jun-ichiro Inoue, Sadamichi Maekawa1990 Volume 59 Issue 10 Pages 3467-3470
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSVarious spin correlation functions around a mobile hole in a two-dimensional antiferromagnetic state are calculated in the t-J model. The correlations show canted and twisted character at k=(0, 0) and (π⁄2, π⁄2), respectively, where the latter is the wave vector of the ground state. Possible spin configurations around the hole are discussed.View full abstractDownload PDF (580K) -
Tomomasa Takatsuka, Yoyu Nakamichi, Ken-ichi Kumagai1990 Volume 59 Issue 10 Pages 3471-3474
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSplit spectra of Cu nuclear quadrupole resonance (NQR) in the chain (Cu(1)) site of the antiferromagnetic YBa2(Cu1−xTx)3O6 (T=Fe, Co, and Ni) show that the spin alignment of Cu moments in the CuO2 plane changes at a critical concentration of the substitution of Cu by T. The spin structure of the low-temperature magnetic phase is discussed.View full abstractDownload PDF (568K) -
Masaaki Takashige, Fuminao Shimizu, Haruhiko Suzuki, Shozo Sawada1990 Volume 59 Issue 10 Pages 3475-3478
Published: October 15, 1990
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe dielectric constant and spontaneous polarization of the acetate-substituted systems of ferroelectric dicalcium strontium propionate Ca2Sr(C2H5CO2)6(1−x)(CH3CO2)6x have been measured as a function of temperature. It is found that the samples with x=0.07 and 0.10 show a para-ferro-paraelectric phase transition sequence like that of Rochelle salt.View full abstractDownload PDF (472K) -
Hiroyuki Mashiyama, Haruhiko Suzuki, Fuminao Shimizu, Toshihisa Yamagu ...1990 Volume 59 Issue 10 Pages 3479-3482
Published: October 15, 1990
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe structural phase transition of K2CoCl4 is investigated by means of X-ray scattering. The transition temperatures are 558 K, 454 K and 142 K. With decreasing temperature, the symmetry of the crystal changes as follows: phase I, normal [Pmcn]; phase II, incommensurate [q=(1⁄3−δ)c*]; phase III, commensurate [P21cn, q=c*⁄3]; and phase IV, commensurate [C1c1, q=a*⁄2+b*⁄2+c*⁄3]. Here the reciprocal vectors refer to the normal phase. In a narrow temperature range just above 142 K, the superreflection at (5/2 3/2 0) splits into two diffuse peaks. The general feature of the successive transitions is very similar to K2ZnCl4.View full abstractDownload PDF (468K) -
B. Madhu, B. A. Sastry, G. Ponticelli, G. Puggioni1990 Volume 59 Issue 10 Pages 3483-3486
Published: October 15, 1990
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSESR studies on [Cu(trien)(enMe4)](BØ4)2 and [Cu(trien)(enEt2)](BØ4)2 are carried out to understand the coordination behaviour, fluxional nature, N-alkylation effects on metal ligand bonds. It is found that the alkylated N-donor atoms are occupying axial positions in these hexacoordinate complexes having CuN4N2′ moieties. It is also observed that in frozen pyridine solutions these complexes have undergone geometric transition from distorted elongated octahedral to distorted compressed tetrahedral symmetry.View full abstractDownload PDF (492K) -
B. Madhu, B. A. Sastry, G. Ponticelli, G. Puggioni1990 Volume 59 Issue 10 Pages 3487-3489
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSESR studies on the title complex revealed the existence of two crystallographically inequivalent molecules in the unit cell. The temperature variation of spin-Hamiltonian constants is indicating that the geometry around copper (II) is mainly square pyramidal with trigonal bipyramidal distortion at 300 K and this distortion is reduced at 77 K indicating the presence of second order Jahn-Teller distortion. The ground state wave functions of copper (II) at both the temperatures are evaluated.View full abstractDownload PDF (376K) -
Osamu Arimoto, Seiji Okamoto, Kaizo Nakamura1990 Volume 59 Issue 10 Pages 3490-3493
Published: October 15, 1990
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSExciton polariton luminescence and its temperature dependence have been investigated in monoclinic ZnP2 crystals. The energies of transverse and longitudinal excitons (ET and EL) are determined by a fit of the reflection spectrum to a simple polariton model. In the vicinity of the 1s exciton, two emission bands are observed at energies ET and EL. They are attributed to the luminescence from lower and upper branch polaritons, respectively. In particular, the lower polariton luminescence band exhibits a well-defined doublet structure at 2 K. Both components are separated from each other by about 1 meV with comparable intensities and the same polarization dependence. With increasing temperature, the higher-energy component decreases rapidly as compared to the lower-energy component. The origin of these emission components is discussed.View full abstractDownload PDF (500K) -
Noboru Takimoto, Seiji Tanaka, Yuichiro Igarashi1990 Volume 59 Issue 10 Pages 3495-3513
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWith the use of a semi-analytic method, a detailed study is given of a nonlinear Mathieu equation with particular emphasis on amplitude modulations. This study is motivated by the remarkable amplitude modulations observed in experiments on parametric amplification of surface waves (the Faraday instability). It is shown that amplitude modulations occur in general as a result of intermittent appearance of an off-resonance state, which is due to the amplitude-dependence of the characteristic frequency. To suppress the appearance of the off-resonance state, a special phase control law is applied, and it is found that the amplitude continues to increase to a limiting value.View full abstractDownload PDF (1816K) -
Daisuke Takahashi, Junkichi Satsuma1990 Volume 59 Issue 10 Pages 3514-3519
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA cellular automaton (CA) of filter automata type is proposed. Any state of the CA consists only of solitary wave solutions. It is shown that the solitary waves interact with one another preserving their identities during a time evolution. It is also shown that the CA has infinitely many conserved quantities. Hence, this CA may be considered to be one of the simplest soliton systems.View full abstractDownload PDF (700K) -
Qi-Ming Liu1990 Volume 59 Issue 10 Pages 3520-3527
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe elementary and simple method of Freeman and Nimmo for verification of solutions of the bilinear soliton equations is developed to the Ablowitz-Kaup-Newell-Segur (AKNS) and the classical Boussinesq hierarchies in the bilinear form. Solutions in terms of double Wronskian determinants are obtained. Several determinantal identities which can be derived from the Laplace expansion theorem are utilized in the proof.View full abstractDownload PDF (648K) -
Kazuaki Narita1990 Volume 59 Issue 10 Pages 3528-3530
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe discrete version of the Hirota equation
iψn+(1⁄2)[(α−βi)ψn−1+(α+βi)ψn+1](1+γ|ψn|2)−αψn=0,
is proposed. The 1-, 2- and N-soliton solutions for this equation are investigated.View full abstractDownload PDF (244K) -
Yukiyasu Ozeki1990 Volume 59 Issue 10 Pages 3531-3541
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe investigate the ground state properties of the ±J Ising model with asymmetric probability weight in two dimensions. We propose a numerical transfer matrix method which enables us to calculate directly the ground-state properties such as correlation functions, defect energy and entropy at T=0. We find that the spin glass correlation function decays in a power law like \ ildeg(r)∼r−\ ildeη with \ ildeη\simeq0.21 in the range 0.5≤p\lesssim0.85, suggesting the weak universality of spin glass—the concentration of +J bond is denoted by p. At the ferromagnetic phase boundary locating around p=0.89, the ferromagnetic correlation function decays as g(r)∼r−\ ildeη with η\simeq0.240±0.016, which suggests the weak universality of ferromagnetic critical exponent from the non-random critical point (p=1, T=2.269…) to the ground sate counterpart. The behavior of correlation functions, and also that of defect energies indicate the existence of an extra-phase, called the random antiphase state, in 0.85\lesssimp\lesssim0.89.View full abstractDownload PDF (1208K) -
Hisao Hayakawa, Tsuyoshi Koga1990 Volume 59 Issue 10 Pages 3542-3552
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSpinodal decomposition in a long-range exchange model where the exchange probability obeys a power law of the distance of exchanged molecules or spins is investigated. Using the interfacial approach and the mean field theory, the scaling form of the pair correlation function is obtained. Our theoretical results are confirmed by a numerical simulation.View full abstractDownload PDF (1288K) -
Masayoshi Sumino, Reijiro Fukuda1990 Volume 59 Issue 10 Pages 3553-3562
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBy using the path integral representation of the double path generating functional W[j1, j2] for the non-equilibrium statistical mechanics, the classical limit of W is discussed. Through the appropriate choice of the factor h, the finite limit of W is shown to exist, thereby obtaining the explicit form of the classical non-equilibrium generating functional. The classical limit of the Legendre transformed generating functional Γ is also discussed.View full abstractDownload PDF (808K) -
Hatsuo Kimura, Masaru Tsuchiya1990 Volume 59 Issue 10 Pages 3563-3570
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe free energy of smectic A liquid crystalline phase in perfectly aligned hard cylinders with length L and diameter D is calculated using the third virial approximation as a function of the order parameter. The second order phase transition from low density nematic phase to high density smectic A phase is found at a packing fraction η=0.355 (=ηc), where the layer spacing d is dc=1.35L. Due to attractive interactions, the system can form the smectic phase at a temperature Tc by a second order thermotropic transition even for cases η<ηc. For such thermotropic smectic A phase, temperature dependences of the layer spacing: (d⁄dc−1)⁄(1−T⁄Tc)∼10−1 and the layer compression modulus: B∼15 (kT⁄vmol)(1−T⁄Tc) are predicted, where vmol is the molecular volume.View full abstractDownload PDF (844K) -
Katsumi Yonei, Tetsuro Motomochi1990 Volume 59 Issue 10 Pages 3571-3583
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBased on the density matrix theory, the kinetic and the exchange energy densities of a homogeneous electron gas in strong magnetic fields are evaluated and they are expressed as functions of the electron density. The form of the kinetic energy density is the same as that which was given previously by Banerjee, Constantinescu, and Rehák (BCR). As to the exchange energy density, the present treatment greatly improves that of BCR, correcting inadequate behavior of the latter for high electron density. From the energy functional which is based on these energy densities, an alternative Thomas-Fermi-Dirac equation is derived and its numerical solutions are obtained for Ne and Ne+. Through a detailed comparison of the calculated results, it is shown that the corrected exchange correction gives a definite improvement upon the BCR model.View full abstractDownload PDF (1396K) -
Jae Min Hyun, Jun Sang Park1990 Volume 59 Issue 10 Pages 3584-3594
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA numerical study is made of the early-stage behavior of spin-up flows of a highly compressible fluid in a rapidly-rotating cylinder. The focus is placed on describing the temporally small-scale motions within and near the Ekman layers. Numerical solutions are acquired to the full, time-dependent, compressible Navier-Stokes equations. The numerical results are processed to render physically meaningful interpretations of the small-time behavior in and around the Ekman layer. Vector plots on the meridional plane are constructed to illustrate the prominence of the compressible Rayleigh effect in the nonlinear regime. The emergence of the corner jet is portrayed. Extensive diagnostic studies are performed to disclose the dominant dynamic effects. Time-histories of the major physical variables are plotted. The time needed for the formation of the Ekman layer is seen to shorten in the nonlinear regime. The oscillatory behavior is clearly depicted, and it is demonstrated that, as the nonlinearity strengthens, the oscillatory frequency increases and the more irregular oscillation patterns emerge.View full abstractDownload PDF (1116K) -
Noriyoshi Nakajima, Masao Okamoto1990 Volume 59 Issue 10 Pages 3595-3601
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBeam currents driven by a neutral particle injection in a helical system (stellarator, heliotron/torsatron) are studied in the 1⁄ν collisionality regime. The general expression for the beam-driven current is obtained for arbitrary magentic field configurations by solving the drift kinetic equation for electrons. It is found that F=Jnet⁄Jb (Jnet is the net current and Jb is the fast ion beam current) increases as ft and Zeff where ft is the fraction of trapped electrons and Zeff is the effective ionic charge number. Especially, for Zeff\simeq1 the effect of trapped electrons is large and F is roughly proportional to ft. On the other hand, if Zeff\gtrsim3 the effect of trapped electrons becomes small.View full abstractDownload PDF (676K) -
A. K. Datta, G. Dasgupta, S. Acharyya1990 Volume 59 Issue 10 Pages 3602-3609
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe experimental thermal diffusion factors αT of He4–Ar40 and Ne20–Xe132 gas mixtures at different compositions of the lighter components and an isotopic natural mixture of Ne20–Ne22 are estimated at the mean temperature \barT=340 K by the column calibration factor method from the available values of ln qe(qe being the equilibrium separation factor) for those mixtures at different pressures in atmosphere for each composition, measured by J. M. Saviron et al. in a thermal diffusion column with the column calibration factor Fs=3.946, the value (at \barT=340 K) derived from the formula Fs=68.94796−0.3174514 \barT+3.71383×10−4T2 as obtained by S. Acharyya et al. It is shown that the experimental αT’s, thus estimated with the help of Fs and ln qmax, agree excellently with those due to the existing methods using molecular models as well as with those due to Slieher’s model-independent method, so far as their magnitudes and the trends of their variation with the mole fraction of the lighter components are concerned. This suggests that the present method is a unique one which can safely be used to study the composition dependence of αT in both the isotopic and nonisotopic cases.View full abstractDownload PDF (856K) -
Reiji Sugaya1990 Volume 59 Issue 10 Pages 3610-3619
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe kinetic wave equation for nonlinear wave-particle scattering (nonlinear Landau damping) of electromagnetic and electrostatic waves in a homogeneous unmagnetized plasma and the velocity space diffusion equation which describes a distortion of a velocity distribution function are derived from Vlasov-Maxwell equations by perturbation theory. The nonlinear wave-particle coupling coefficient in the kinetic wave equation and the velocity space diffusion coefficient are expressed by four-order tensors which can be also applied to the cases in which two scattering waves are electrostatic or partially electrostatic. The conservation laws for total energy and momentum densities of waves and particles are confirmed, and the time evolutions for energy and momentum densities of particles are given by means of nonlinear wave-particle coupling coefficients.View full abstractDownload PDF (832K) -
Kazuyoshi Torii, Teruyuki Tamaki, Nobuyoshi Wakabayashi1990 Volume 59 Issue 10 Pages 3620-3628
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe ordering kinetics of the order-disorder phase transition in Cu3Au has been investigated by X-ray diffraction. The time dependence of the (1 1 0) superlattice peak profile was measured at various temperatures. The data were analyzed on the basis of models for time developments of stable and unstable states. The results of the analysis revealed the features associated with the three characteristic temperatures, Tinstability, Tc and Tclassical.View full abstractDownload PDF (972K) -
Masayoshi Shimokoshi, Kikuo Ohi1990 Volume 59 Issue 10 Pages 3629-3634
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAngular dependence of Fe3+ ESR spectra in hexagonal BaTiO3 has been measured around the ferroelectric phase transition temperature of 66 K (Tc). The principal axes of crystal field tensor rotate in the ab-plane with decreasing the temperature from Tc to 51 K. The rotation angle becomes 30° at 51 K and the axes do not rotate below 51 K. Analysis due to the superposition model indicates that shear strain uxy appears in the ab-plane between Tc and 51 K, and the symmetry becomes monoclinic 2.View full abstractDownload PDF (624K) -
Riki Kawashima, Mitsuru Satoh1990 Volume 59 Issue 10 Pages 3635-3641
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe AC conductivity shows anomalous temperature dependence, with thermal hysteresis, near the phase transition points along the c-axis of KNO3 crystal. The spectra of conductivity in the range from 50 Hz to 100 kHz on the complex conductivity plane show similar semicircles in phases III, II and I below ∼160°C. The fractional power law behaviour has been found in the frequency variation in the real component of the complex conductivity above ∼160°C in phase I. The relaxation time τ(T) can be evaluated from the experimental results. The behaviour of τ(T) shows stepwise variation, with thermal hysteresis, near the phase transition points and anomalous increase above ∼160°C.View full abstractDownload PDF (536K) -
Tetsuya Ogawa1990 Volume 59 Issue 10 Pages 3642-3649
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSurface structure of polyethylene crystals is examined by small-angle X-ray scattering (SAXS). Folded chain crystals crystallized isothermally and extended chain crystals annealed isothermally showed SAXS obeying the Porod’s law in a range of scattering vector from 10−1.2 to 10−0.5 Å−1; the surfaces of these crystals are smooth above a scale of length of 20 Å. This result suggests that the thickening process of polymer crystals is controlled by nucleation and growth. Fractal surfaces reported previously are related with the fluctuation of driving force for the thickening; the fluctuation has power-law correlation in space or time.View full abstractDownload PDF (960K) -
Norikazu Ishimura, Takao Yamamoto1990 Volume 59 Issue 10 Pages 3650-3659
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA phenomenological lattice gas model is used to discuss the ground state configurations of the two species adatoms chemisorbed on top of substrate atoms. The substrate atoms form a square lattice. The adsorbed atoms induce the reconstruction of the first layer lattice of the substrate. The ground state phase diagram is obtained. Many commensurate phases with very complex adatom configuration are found. The complexities of the adsorbed pattern is caused by the long range adatom-adatom interaction mediated effectively by the displacements of the first layer atoms of the substrate.View full abstractDownload PDF (1036K) -
Tsuneaki Miyahara, Takao Yamazaki, Akio Kotani, Hiromu Arai, Tsutomu M ...1990 Volume 59 Issue 10 Pages 3660-3668
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe 3p-XPS and the 3d-XPS of LaAl2 CeAl2 and CeRu2 are measured using undulator radiation at the Photon Factory. The obtained data are analyzed satisfactorily with the use of the impurity Anderson model. From the analysis for CeRu2, the 3p and 3d core-hole potentials acting on 4f electrons are found to be almost the same.View full abstractDownload PDF (864K) -
Hisatoshi Yokoyama, Hiroyuki Shiba1990 Volume 59 Issue 10 Pages 3669-3686
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSNew variational wave functions are introduced to describe the Hubbard model in strong correlation. Intersite correlation (or Jastrow) factors are taken into account beyond the Gutzwiller wave function (GF). A study is made on the one-dimensional lattice and the two-dimensional square lattice at half-filling as well as less-than-half-filling. Much improvement can be achieved thereby in the description of physical quantities such as the momentum distribution and spin and charge density correlation functions. In addition, the ground state energy is lowered appreciably compared with the GF. In this connection, the Mott-Hubbard-type metal-insulator transition is also re-examined.View full abstractDownload PDF (1848K) -
Hideyuki Sato, Isao Sakamoto, Tadashi Fukuhara, Yoshichika \={O}nuki, ...1990 Volume 59 Issue 10 Pages 3687-3690
Published: October 15, 1990
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe temperature dependences of thermoelectric power for various type of uranium compounds of Pauli itinerant UIr3 and U6Fe, spin fluctuating USn3, heavy fermion URu2Si2 and UCu5, and 5f localized UPd3 are measured. We found that various kinds of phase transitions in these materials are well reflected in the thermoelectric effect.View full abstractDownload PDF (448K) -
Tatsuo Schimizu, Hiroshi Kamimura1990 Volume 59 Issue 10 Pages 3691-3697
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe anomalous behavior of the Hall effect in the normal state of La2−xSrxCuO4 is investigated theoretically based on the recently calculated results that 3B1g is the ground state of CuO6 cluster in La2−xSrxCuO4 for x>0.1. Fitting the transfer interaction of 3B1g cluster in La2−xSrxCuO4 to the a1g* band in the LDA band structure, we first note that the band width of a1g* band, about 0.8 eV, is much smaller than the Hubbard U interaction between a1g* holes. Then the x-dependence of the Hall coefficient is calculated within the Hubbard I approximation for T=0 K. The calculated results show that, (1) the Hall coefficient at T=0 K behaves inversely as x in the low Sr concentration region up to x∼0.05, (2) it deviates downwards from 1⁄x in the region above x∼0.05, and (3) it changes the sign from positive to negative at x=0.42. Anomalous temperature dependence is also discussed.View full abstractDownload PDF (816K) -
Yohsuke Yoshinari, Hiroshi Yasuoka, Yutaka Ueda, Kei-ichi Koga, Koji K ...1990 Volume 59 Issue 10 Pages 3698-3711
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe temperature dependence of both the Knight shift (K) tensor and the nuclear spin-lattice relaxation rate (1⁄T1) in the normal state have been studied, by using the magnetically oriented powered samples of YBa2Cu3O6+x with x=0.96, 0.8 and 0.6. From the K−χ plot for the planer oxygen sites (O(2, 3)), we have determined the principal values of the hyperfine field tensor and found that those hardly depend on the hole concentration. The remarkable feature has emerged from the T-dependence of the 1⁄(T1T) at the O(2, 3) sites; i.e. it reveals almost the same T-dependence of the spin parts of the Knight shift. This observation suggests that the energy width of the spin excitations around q∼0 is T-independent in the normal state. The Knight shift tensor at the apical oxygen sites has also been measured and is discussed.View full abstractDownload PDF (1596K) -
Motoaki Sano, Katsunori Iio, Kazukiyo Nagata1990 Volume 59 Issue 10 Pages 3712-3719
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMagnetic symmetry in the basal-plane of a hexagonal antiferromagnet CsMnI3 was investigated by measuring the birefringence (Δnxy) for light propagating along the c-axis as a function of the strength and the direction of a magnetic field H. The results showed that Δnxy(H) saturates for H>1 kOe applied perpendicular to the c-axis in the low temperature phase (T<TN2=8.20 K) and the saturation value of Δnxy was almost constant irrespective of the direction of the field. A feature was that Δnxy(H) returned to initial value without hysteresis even after the saturation. These behaviors were discussed in terms of a modified spin-flop theory taking account of the volume variations of the three equivalent domains.View full abstractDownload PDF (856K) -
Akihiko Nishida, Kazumi Horai1990 Volume 59 Issue 10 Pages 3720-3726
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTemperature dependence of the g value, linewidth and peak height of the conduction electron spin resonance in silver has been investigated with the transmission method at the frequency of 22.7 GHz over the temperature range 1.7 to 43 K. We have observed a g shift at the highest temperatures due to the positive exchange coupling larger than g anisotropy, in accordance with the theoretical model by Freedman and Fredkin (1975). Phonon-induced spin relaxation has been found to be proportional to the phonon-induced momentum relaxation of electrons.View full abstractDownload PDF (736K) -
Riki Kawashima, Takeyoshi Matsuda1990 Volume 59 Issue 10 Pages 3727-3731
Published: October 15, 1990
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe electric properties in temperature region from room temperature to −65°C along a direction perpendicular to (100) of a samarium nitrate crystal have been measured. The anomalous behaviors have been found in the temperature region from ∼10°C to ∼−45°C. The unstable properties have been analyzed by the aid of a simple one dimensional map. The characteristic frequency dependence of the electric properties in the temperature region has been found in the frequency range from 50 Hz to 100 kHz. The plots in the complex conductivity plane show deformed semicircle in the unstable temperature region.View full abstractDownload PDF (500K) -
R. Hernández-Gómez, C. Ruiz Mejía1990 Volume 59 Issue 10 Pages 3732-3739
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe shift with concentration variation on the optical-absorption of U band in KCl:KBr and KCl:NaCl mixed crystals was studied by use of point-ion and size-ion correction models. We found that using the Bartram et al. method there is not appreciable correction to the point-ion energies. Assuming, for the ground state, that the electrons are concentrated at the lattice site, the calculated energies are in good agreement with the experimental results for KCl, KBr and NaCl in pure state.View full abstractDownload PDF (764K) -
Youichi Ohno1990 Volume 59 Issue 10 Pages 3740-3749
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe valence-electron and inner-shell-electron energy-loss spectra of SnS2 are measured in reflection geometry. They are compared with the transmission electron-energy-loss spectroscopy (TEELS) spectra at various momentum transfers, the S K X-ray-absorption spectroscopy (XAS) spectrum, the reflectivity (R) spectrum, and the bremsstrahlung-isochromat spectroscopy (BIS) spectrum. The plasmon energy estimated at E0=1000 eV is 18.8 eV, which is equal to the one at the momentum transfer of 0.34 Å−1. The valence-electron REELS spectrum satisfies the dipole selection rules only to the first approximation. It seems that indirect and optically-forbidden transitions affect the energy-loss structures related to interband transitions. The inner-shell-electron REELS spectra are compatible to the XAS, the core R, and the BIS spectra except for the fact that optically-forbidden transitions are clearly observed in REELS when using low incident-energy beams.View full abstractDownload PDF (1268K) -
Takashi Fujikawa, Morio Hosoya1990 Volume 59 Issue 10 Pages 3750-3764
Published: October 15, 1990
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBasic formulas to analyse ARXPS spectra are derived from first principles based on Dyson orbital theory. The formula for no loss peak is reduced to that written in terms of a damping one-electron wave function. Application of site T-matrix expansion generalizes the currently used one-electron ARXPS formula. Spherical wave correction is also included by use of the method proposed by Rehr et al. The present method is applied to structural analysis of Si(111)-(\sqrt3×\sqrt3)Ag adsorbed system in the lowest approximation where Hartree-Fock potential and only m=0 spherical wave correction are used. The present calculation recommends HCT and QH models where the outermost layer is Ag layer.View full abstractDownload PDF (1492K)