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Volume 58, Issue 1
Displaying 1-48 of 48 articles from this issue
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Tsuyoshi Horiguchi1989 Volume 58 Issue 1 Pages 1-4
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAn Ising model on a Kagomé lattice is solved exactly under correlated random fields which take values ±h. There exists a critical field hc=4J(J>0 is the exchange integral) and a phase transition for the h<hc, but there is no phase transition for the system with h≥hc. This result is consistent with the lower critical dimensionality obtained by the domain energy argument.View full abstractDownload PDF (388K) -
Hidezumi Terazawa1989 Volume 58 Issue 1 Pages 5-8
Published: January 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIt is demonstrated that the average charged multiplicity (⟨nch⟩) and transverse momentum (⟨pT⟩) of produced particles in hadron-hadron collisions at very high energies (\sqrts) have a simple relation of ⟨nch⟩2⟨pT⟩⁄\sqrts=constant (=0.70±0.05) in the generalized Fermi-Landau statistical and hydrodynamical model. The relation is satisfied remarkably well by the experimental data up to the SPS p-\barp Collider energies and will soon be tested by Tevatron Collider experiments.View full abstractDownload PDF (448K) -
A. Abzouzi, M. S. Antony, J. B. Bueb, J Britz, V. B. Ndocko Ndongu&eac ...1989 Volume 58 Issue 1 Pages 9-12
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSRoot-mean-square charge radii are related to the empirical formula ⟨r2⟩ch1⁄2=pA1⁄3+q. From least squares fits to experimental charge radii of nearly spherical nuclei having mass numbers between 12 and 208, deformed rare earth nuclei with 152≤A≤160 and deformed heavy nuclei with 232≤A≤242, radial charge distributions are predicted for medium and heavy spherical, as well as heavy deformed nuclei.View full abstractDownload PDF (356K) -
Tetsuo Koizumi, Tatsuji Hayaishi, Takashi Matsuo, Kunihiro Shima, Hiro ...1989 Volume 58 Issue 1 Pages 13-16
Published: January 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe total photoion yields of xenon have been measured in the L-shell ionization region covering the photon energy from 4.6 to 6.1 keV with the step width of wavelength scans of about 0.0025 Å. Monochromatized undulator radiation was used as a light source and crossed with an atomic xenon beam. Sharp peaks at the L3 and L2 edges, which had not been observed in previous work, are clearly seen in the present data. It can be suggested that these peaks are due to the photoexcitation of 2p electrons to the unfilled higher levels. Furthermore, a structure above the L3 edge which suggests deviations from the power lawlike energy dependence predicted by an independent electron model can be seen in the present data. This structure might be due to simultaneous two-electron excitation.View full abstractDownload PDF (456K) -
Shunsuke Hara1989 Volume 58 Issue 1 Pages 17-19
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSRotationally-vibrationally resolved photoionization cross sections and asymmetry parameters for vibrationally excited H2 are calculated for HeI-α 584 Å radiation. Vibrationally resolved and vibrationally summed cross sections and asymmetry parameters for vibrationally excited H2 are also determined based on these results.View full abstractDownload PDF (356K) -
Iwao Hosokawa, Kiyoshi Yamamoto1989 Volume 58 Issue 1 Pages 20-23
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe fine structure of the isotropic turbulence, which has recently been realized in a supercomputer by the authors, is studied at its fully-developed state. The geometrical relationship between vorticity-concentrated regions and high-strain regions and a variety of mutual orientations of the velocity and vorticity vectors in these regions are illustrated. A common exponential nature and a delicate difference of the space distributions of the velocity (longitudinal and lateral) gradients, along with the magnitude of vorticity and the square-root of local dissipation, are exposed.View full abstractDownload PDF (628K) -
Ken-ichi Hattori, Yoshio Ueda, Junji Morikawa, Hitoshi Nihei, Zensho Y ...1989 Volume 58 Issue 1 Pages 24-27
Published: January 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSToroidally asymmetric perturbations of toroidal flux in a reversed field pinch (RFP) plasma have been observed with a set of 18 flux loops in ramping current discharges on the REPUTE-1 RFP. The toroidal flux perturbation is induced toroidally localized and spreads as it propagates in the electron-diamagnetic drift direction. The dominant toroidal mode number of the flux perturbation is usually 1, but becomes 2 when the toroidal flux is strongly generated, and the second peak merges with the first one as it propagates in the toroidal direction. Thus, a locally generated toroidal flux becomes toroidally symmetric.View full abstractDownload PDF (544K) -
Noriyasu Ohno, Masayoshi Tanaka, Akio Komori, Yoshinobu Kawai1989 Volume 58 Issue 1 Pages 28-31
Published: January 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA set of cascading bifurcations and a chaotic state in the presence of an external periodic oscillation are experimentally investigated in a current-carrying plasma. The measured bifurcation sequence leading to chaos, which is controlled by changing plasma densities and the frequencies of external oscillations, is in qualitative agreement with a theory which describes anharmonic systems in periodic fields.View full abstractDownload PDF (464K) -
Daijiro Yoshioka1989 Volume 58 Issue 1 Pages 32-35
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA nearly half-filled two-dimensional Hubbard model has been considered as a model for a high transition temperature oxide superconductor. A new scheme to treat this model, the slave-fermion method, is proposed. The method is applied to the model in the limit of large U at half-filled, where the model reduces to the antiferromagnetic Heisenberg model. It is shown that the ground state energy becomes much lower in the slave-fermion scheme than that in the slave-boson scheme. The ground state shows antiferromagnetic long range order at T=0.View full abstractDownload PDF (528K) -
Kenji Ishida, Yoshio Kitaoka, Kunisuke Asayama1989 Volume 58 Issue 1 Pages 36-38
Published: January 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSNuclear quadrupole resonance (NQR) signals of 65Cu and 63Cu have been discovered in the high-Tc superconducting oxide (La0.925Sr0.075)2CuO4 at 33.0 MHz and 35.3 MHz, respectively. The temperature dependence of the nuclear spin-lattice relaxation rate 1⁄T1 was similar to that of Cu(II) (CuO2 plane) in the YBa2Cu3O7−δ system (Y system). From the behavior of 1⁄T1, it is pointed out that the relaxation arises from the same mechanism as that of the CuO2 plane in the Y system, where the relaxation in the normal state is considered to be dominated by the spin fluctuations of the nearly localized Cu-3d holes.View full abstractDownload PDF (312K) -
Guo-qing Zheng, Yoh Kohori, Yasukage Oda, Kunisuke Asayama, Ryozo Aoki ...1989 Volume 58 Issue 1 Pages 39-42
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA series of measurements on the nuclear spin-lattice relaxation rate, T1−1, of 63Cu in superconducting multilayer Nb–Cu has been performed over a temperature range from 4.2 K down to 0.3 K, using the field cycling method. T1−1 decreases rapidly after an initial increment just below Tc. At low temperatures, however, the rate of the decrease slows down, and T1−1 decreases in proportion to temperature. It has been concluded that such behavior of T1−1 originates from a distribution of the energy gap of the Cooper pairs in Cu. The electrons which are propagated nearly normal to the S–N interface have a finite energy gap predicted by McMillan, while the electrons propagated nearly parallel to the interface are gapless and behave like normal electrons.View full abstractDownload PDF (452K) -
Hikomitsu Kikuchi, Yoshitami Ajiro, Takao Goto1989 Volume 58 Issue 1 Pages 43-46
Published: January 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA133 Cs NMR experiment is performed to study the nonmagnetic impurity effect on spin frustration in the hexagonal compound CsCoCl3, which shows successive magnetic phase transitions at TN1=21 K and TN2=9 K. In the low-temperature phase below TN2, an inhomogeneous ferrimagnetic state is realized in an impure crystal containing 1.0 at% Mg ions, in which the local spin structure has the same ferrimagnetic configuration as it does in the pure case. The NMR signal disappears completely in the intermediate region between TN2 and TN1, suggesting a strong impurity effect on the spin dynamics.View full abstractDownload PDF (492K) -
Hidetoshi Fukuyama1989 Volume 58 Issue 1 Pages 47-49
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFluctuations of Landau diamagnetism are calculated for small structures in the diffusive regime based on the Green function formula for the orbital magnetism. The results indicate that such fluctuations should be observable in presently attainable structures.View full abstractDownload PDF (352K) -
Takashi Ohno, Yutaka Kishimoto, Yoshihiro Yamada, Yoshitaka Michihiro, ...1989 Volume 58 Issue 1 Pages 50-53
Published: January 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESS11B nuclear spin-lattice relaxation time T1 has been measured in order to study the anomalous properties of SmRh3B2 from the microscopic viewpoint. No anomaly has appeared at the temperature where the electric resistivity changes drastically. The temperature dependence of 1⁄T1T in the paramagnetic state (T>100 K), where the uniform magnetic susceptibility hardly changes with temperature, has been found to show the typical weak antiferromagnetic case of itinerant electrons.View full abstractDownload PDF (352K) -
Syuji Kawada, Iwao Takei, Hiroyuki Abe1989 Volume 58 Issue 1 Pages 54-57
Published: January 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSSingle crystals of KOH-doped ice were grown by a modified Bridgemann method and the dielectric relaxation spectrum was measured in the wide temperature range, from near the melting point to about 65 K in order to elucidate the origin of acceleration of the dielectric relaxation by KOH-doping. It was found that the new relaxational process, in which the dielectric relaxation is greatly accelerated appears near the eutectic point (108 K) and it follows the Arrhenius relation below about 90 K. The phase transition at 72 K reported on the polycrystalline KOH-doped ice was observed on a 2.2 ppm KOH-doped single crystal for the first time.View full abstractDownload PDF (376K) -
Ikuo Yamamoto1989 Volume 58 Issue 1 Pages 58-61
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe complex dielectric susceptibility of a random dipole system is calculated numerically on the basis of a Glauber model with dipole-dipole interaction. For xp2⁄(εmd3kBT)\simeq0.01(p: dipole moment, εm: dielectric constant, d: lattice constant), a complex plane plot (Cole-Cole plot) of the result is greatly dependent on both the temperature T and the dipolar concentration x, and its locus exhibits characteristic asymmetry. It is shown that this behavior agrees semiquantitatively with the experiment on KI1−x(NO2)x.View full abstractDownload PDF (380K) -
Shuji Abe1989 Volume 58 Issue 1 Pages 62-65
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe effect of long-range Coulomb interaction between an electron and a hole on the optical absorption spectrum of a one-dimensional Peierls insulator is studied theoretically. Energy levels and oscillator strengths of exciton states in the Peierls gap and the line shape of the continuous spectrum (interband transitions) above the gap are calculated by taking the interatomic nature of the optical transition matrix element into account. The effect turns out to be of great significance, in the sense that even a very weak interaction induces an anomalously large oscillator strength of the lowest exciton (n=0) state.View full abstractDownload PDF (528K) -
Yoshimasa Matsuno1989 Volume 58 Issue 1 Pages 67-72
Published: January 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA new proof of the rational N-soliton solution for the Kadomtsev-Petviashvili equation is presented. The proof is based only on an elementary theory of determinants and has no relation to the inverse scattering method. Various novel formulas for determinants are also derived in connection with the rational N-soliton solution.View full abstractDownload PDF (472K) -
Masanori Takaoka1989 Volume 58 Issue 1 Pages 73-81
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe relation between the pole distribution and the steady pulse solution is investigated for the fifth order Korteweg-de Vries equation (in short FKDV eq.): ut+αuux+βu3x+γu5x=0. Poles are generally found to distribute fractally and to form a natural boundary; which has been observed clearly in computation, when the steady pulse has a prominent oscillatory tail structure. Periodic distribution of poles are found for some specific cases where the solutions are represented by hyperbolic functions. New analytic solutions with periodic distribution of poles are found. The concept of ‘base poles’ is introduced and its relation to the tail part of a pulse is clarified.View full abstractDownload PDF (904K) -
Yukiyasu Ozeki, Hidetoshi Nishimori, Yasuhiro Tomita1989 Volume 58 Issue 1 Pages 82-90
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe existence of long-range order is proved under certain conditions for the antiferromagnetic XYZ model on the simple cubic or the square lattice. In particular, the spin-1⁄2 XXZ model on the square lattice is shown to have ground-state long-range order if the exchange anisotropy Δ satisfies 0≤Δ<0.20 or Δ>1.72, which improves the result of Kubo and Kishi. The existence of long-range order of the z-component of the spin operator is proved for the XXZ model with XY-like anisotropy (0≤Δ≤1) under certain conditions. A similar result is shown to hold for the long-range order in the x-direction for the Ising-like model (Δ≥1). The XXZ model on the two-dimensional hexagonal lattice is proved to have finite ground-state long-range order for any value of Δ(≥0) if S≥1 and for Δ>2.55 when S=1⁄2.View full abstractDownload PDF (1020K) -
Young Hee Lee, Micheal A. Lee1989 Volume 58 Issue 1 Pages 91-100
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSQuantum simulation of the electronic structure of the atoms and molecules provides a rigorous upper bound to the true ground states energy in these systems. Short time approximation for the Green’s function is investigated. It is found that certain approximations to the short time Green’s function introduce significant errors in the wavefunction near the nodes. These errors can cause the rigorous upper bound to be violated. We will introduce exactly solvable one-dimensional system and explicitly show how the ground state energy is affected by the approximations.View full abstractDownload PDF (1020K) -
Yoshitaka Tanimura, Ryogo Kubo1989 Volume 58 Issue 1 Pages 101-114
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA test system is assumed to interact with a heat bath consisting of harmonic oscillators or an equivalent bath with a proper frequency spectrum producing a Gaussian-Markoffian random perturbation. The effect of reaction of the test system to the bath is considered in the high temperature approximation. Elimination of the bath using the influence functional method of Feynman and Vernon yields a continuous fraction expression for the reduced density matrix of the test system. The result affords a basis to clarify the relationship between the stochastic and the dynamical approaches to treat the problem of partial destruction of quantum coherence of a system interacting with its environment.View full abstractDownload PDF (1220K) -
Nabil T. Eldabe1989 Volume 58 Issue 1 Pages 115-120
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe model used is that of two dielectric fluids of infinite depth, with the interface initially in the form of a sine wave with amplitude small compared to the wave length. The fluids are considered incompressible and inviscid, being stressed by gravity force, tangential electric field, and a constant acceleration in a direction normal to the inferface. Stability conditions for the interface are obtained. It is found that the tangential electric field plays a stabilizing role, and can be used to suppress the instability of the system at a given wave number.View full abstractDownload PDF (516K) -
Koji Ohkitani1989 Volume 58 Issue 1 Pages 121-128
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMotion of an interface is considered between two infinite layers of uniform vorticity in two-dimensional flow of inviscid fluid. The vorticity jumps at the interface but the velocity is continuous to inhibit the Kelvin-Helmholtz instability. The dynamics of the interface is described with an extention of Birkhoff equation for an irrotational perturbation. Fully nonlinear behaviors are studied by numerical simulations based on the point-vortex method. For large enough disturbances, “filaments” are formed as in the case of Contour Dynamics of finte vorticity regions. The curvature grows appoximately exponentially with respect to time and the well-posedness of the problem is suggested.View full abstractDownload PDF (812K) -
Ryuji Takaki, Akijiro Katsu, Yoji Arai, Ken Adachi1989 Volume 58 Issue 1 Pages 129-139
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe transition of the vibration mode of an evaporating drop of liquid nitrogen placed on a horizontal surface at room temperature is investigated by image analysis and model simulation. The vibration mode is indicated by the number of waves n appearing along the periphery. In this paper, images of the drop in 16 mm film made during the transition from the n=5 mode to the n=3 mode are processed. From the images of the instantaneous plane shapes, nonlinear interaction between several modes and random behavior are identified during the transition. A simple model analysis is created to simulate this transition process. Results of the model analysis agree with the observation, and suggest a dependence of the transition mechanism on the degree of thermal inequilibrium.View full abstractDownload PDF (1356K) -
Makoto Umeki, Tsutomu Kambe1989 Volume 58 Issue 1 Pages 140-154
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSurface waves in a closed container subject to vertical oscillation are studied. Nonlinear dynamical equations of two nearly degenerate subharmonic modes responding to the external forcing are derived, using the averaged Lagrangian method for slowly varying amplitudes. Stability and bifurcation diagrams are shown for the system with linear damping. Period-doubling bifurcation and chaotic solutions with one positive Lyapunov characteristic exponent are obtained numerically. It is shown that some of the period-doubling bifurcations are related to the symmetry of the dynamical system.View full abstractDownload PDF (1480K) -
Ahmed E. Radwan, Samia S. Elazab1989 Volume 58 Issue 1 Pages 155-158
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe magnetohydrodynamic instability of a streaming fluid jet (radius R0) ambient with streaming liquid is studied to the axisymmetric (m=0) and the non-axisymmetric (m≥1) disturbances (m is the azimuthal wavenumber). When the surface tension effect is suppressed; the jet is stable to all m≥0 for all wavelengths. In the absence of the magnetic field; the model is stable to all m≥1 for all wavelengths and also stable to m=0 if the perturbed wavelength is equal to or shorter than 2πR0. While it is unstable only to m=0 if the perturbed wavelength is longer than 2πR0. The streaming has a destabilizing effect. If the magnetic fields are sufficiently high, so that the Alfvén wave velocities are greater than the streaming velocities of the two fluids; the jet is stable against all disturbances and vice versa.View full abstractDownload PDF (456K) -
Jae Min Hyun, Jun Sang Park1989 Volume 58 Issue 1 Pages 159-166
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Rayleigh problem of a compressible gas contained in an infinitely long cylinder is considered. The time-dependent flow of the initially motionless gas driven by the rapidly rotating cylindrical sidewall is described. The flow field is determined by the two principal dynamic mechanisms: the compressible Rayleigh effect and the curvature effect. Comprehensive numerical calculations have been performed to solve the governing complete, time-dependent, compressible Navier-Stokes equations formulated in cylindrical coordinates. The details of the evolutions of flow and temperature fields are presented. Unlike the Rayleigh problem about a flat plate, the centrifugal compression causes a small radially-outward normal velocity component in a narrow region very close to the sidewall. Also, due to the boundedness of the flow domain, the propagating compression wave is reflected at the central axis. The importance of the curvature effect relative to the compressible Rayleigh effect decreases as E·M decreases, where E and M denote respectively the Ekman number and the Mach number. Numerical results are exhibited to corroborate this assertion.View full abstractDownload PDF (880K) -
Ken-ichi Hattori, A. Cavallo, Hiroshi Yamada, G. Taylor, P. Efthimion, ...1989 Volume 58 Issue 1 Pages 167-180
Published: January 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe m=1 island size or m=1 deformation of magnetic surfaces during sawtooth crashes is estimated on TFTR by comparing experimental observations of X-rays and ECE electron temperature with a simple simulation which calculates signals of line-integrated X-ray and local electron temperature assuming rigid rotation of the plasma. Sawteeth oscillations with a slow crash (τcrash∼several ms) can be simulated by a Kadomtsev-type reconnection model in which an m=1 island grows to the size of the q=1 surface during the sawtooth crash. In the sawteeth which have a fast crash (50 μs∼τcrash∼500 μs), the m=1 island size sometimes (not always) becomes ∼1⁄2 of the sawtooth inversion radius during the crash phase. The final structure, however, is hard to identify, because of the slow plasma rotation frequency. The “Hot Core” appears to move away from the plasma center in a Kadomtsev-type reconnection without causing very large transport or diffusion.View full abstractDownload PDF (1316K) -
Effects of Covalency on the Phonon Dispersion Relations in the NaCl-Type Alkali Halide Crystals. IIIKiyosi Motida1989 Volume 58 Issue 1 Pages 181-194
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA lattice dynamical model for the NaCl-type crystals are constructed which is a composite of the covalency model and the deformation dipole model. Using this model, the covalency parameter nc, the number of electrons occupying the outer most s orbitals of an alkali metal atom, is determined from the measured dispersion curves of 13 NaCl-type alkali halides by the least-squares analyses subject to the constraint that the model parameters reproduce the dielectric and elastic constants. The obtained nc values are contrary to the expectation of the traditional idea (nc=0): about 0.08 for the fluorides, 0.10 the chlorides, and 0.15 the bromides and iodides.View full abstractDownload PDF (1636K) -
Takashi Yasuda, Shoichi Mase1989 Volume 58 Issue 1 Pages 195-203
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBy making use of revised values of the force constants consistently with the EXAFS studies, the optical measurements and the inelastic neutron scattering spectra, we recalculate the phonon dispersion curves and the density of states curve D(E) for the oxide-superconductor YBa2Cu3O7−x. Main results are summarized as follows: (i) The calculated results well explain Raman and infrared data including the effect of oxygen deficiency on the phonon spectra; (ii) The D(E) curve is in an agreement with the inelastic neutron diffraction data by Renker et al. The high energy part of the D(E) curve is contributed from the oxygen vibrations, while the low energy part is due to the acoustic branch and vibrations of heavy metallic ions. Finally, a brief comment is made about previous interpretations of ultrasonic data and of the origin of the high Tc superconductivity.View full abstractDownload PDF (984K) -
Bin Okai, Koh Takahashi1989 Volume 58 Issue 1 Pages 204-209
Published: January 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSAt the B1-to-B2 phase transition of BaS induced under pressure, the preferred orientation relationship, (A) (100)B1⁄⁄(111)B2 and (B) (111)B1⁄⁄(100)B2, holds as in the case of alkali halides. With an additional uniaxial compression, another type of relationship, (A) (100)B1⁄⁄(111)B2 and (C) (010)B1⁄⁄(\bar101)B2, holds, where the uniaxial compression may be applied either in the direction of [100]B1 or [010]B1. Since (A) and (B) is deduced from (A) and (C), the latter relationship seems to be more fundamental.View full abstractDownload PDF (616K) -
Ikuo Yamamoto, Kimihiko Iwasaki, Shunsuke Hirotsu1989 Volume 58 Issue 1 Pages 210-215
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe spectrum of light scattered from poly (N-isopropylacrylamide) (NIPA) chains (molecular weight MW∼1.3×106) in water has been investigated as a function of temperature by using photon correlation spectroscopy. In a dilute solution (27 μg/cm3) we observed a sharp change in polymer size that corresponds to a coil-globule transition of a single polymer chain. The transition occurred at 34.1°C, accompanied by a sharp decrease in hydrodynamic radius from 1000 to 600 Å as the temperature was increased. In a semi-dilute solution (2.7 mg/cm3) a phenomenon of critical slowing down in the polymer concentration fluctuations was observed around the phase separation temperature, which is very similar to the previous observation on NIPA/water gel.View full abstractDownload PDF (680K) -
Hiroshi Furukawa1989 Volume 58 Issue 1 Pages 216-221
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe multi-time scaling for the phase separation is developed. Applying this scaling, the asymptotic form of the structure function is discussed. For the conservative system the structure function behaves as ∝k4 at small wave numbers k’s in the late stage of the phase separation. Using this asymptotic property a simplified structure function is given, which is found to agree well with experimental data.View full abstractDownload PDF (660K) -
Naoto Minari, Keiichi Ikegami, Shin-ichi Kuroda, Kazuhiro Saito, Mitsu ...1989 Volume 58 Issue 1 Pages 222-231
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAn extended model of flow orientation has been developed for analyzing the inplane anisotropy in Langmuir-Blodgett (LB) films by taking into account the viscoelastic nature of a condensed monolayer at the air-water interface as a Bingham plasticity. The model is based on a two-dimensional fluid and a line-sink as representing the monolayer and the substrate, respectively. The predictions from the present model with respect to the dichroic behavior have been experimentally verified employing a mixed LB system of a merocyanine dye and a fatty acid. The model is also consistent with the remarks from ESR line-shape analysis reported previously and those from analysis of the optical absorption spectra using the extended dipole theory. These results show that the inner stress due to the velocity gradient in the monolayer during the deposition is the origin of the in-plane anisotropy.View full abstractDownload PDF (1108K) -
Noriyuki Kurita, Kenji Nakao1989 Volume 58 Issue 1 Pages 232-243
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe self-consistent band structures of nickel chalcogeno-phosphate NiPS3 are calculated for three kinds of magnetic structures. By comparing the total energies, the experimentally observed magnetic structure proves to be stable. The main features of the band structure for that magnetic structure are the following: the indirect band gap is 0.5 eV; the lower conduction bands originate mainly from the P 3s, S 3p and down-spin Ni 3d eg states; the Ni 3d band splits into four narrow groups and all of them lie near the Fermi level; the magnetic moment of a Ni ion is 1.03 μB. It is evident from this result that the Ni 3d bands have a considerable effect on various physical properties such as intercalation capacity.View full abstractDownload PDF (1416K) -
Noriyuki Hamakawa, Masahiro Inoue, Tadashi Takemori, Hiroshi Miyazaki, ...1989 Volume 58 Issue 1 Pages 244-254
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA self-consistent electronic structure at InAs-GaSb interface is studied in the effective mass approximation. At interface, the envelope functions are connected by the transfer matrix method of Ando and Mori, and the spin-orbit interaction is explicitly taken into account. It is reported that electrons in InAs conduction band exhibit sharp resonance levels in the energy range of GaSb valence band due to the large off-diagonal components of the transfer matrix. The obtained charge density at the inferface is in agreement with experiments.View full abstractDownload PDF (1344K) -
Tatsuji Yanauchi, Masaaki Yamada, Kazuhide Tanaka, Yuh Yamada, Uichiro ...1989 Volume 58 Issue 1 Pages 255-259
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSoft X-ray AlKβ emission spectra of Cu–Zr–Al, Cu–Ti–Al and Ni–Ti–Al alloy glasses with a fixed Al concentration of 20 at.% have been measured. The spectra generally consist of two peaks. The upper and lower energy peaks are assigned to Al atoms environed by early (Ti, Zr) and late (Cu, Ni) transition metals in the ternary glasses, respectively. By evaluating the relative intensity of these component peaks, a trend of chemical ordering of the transition elements about Al atoms has been derived.View full abstractDownload PDF (572K) -
Tetsuo Hatakeyama, Hiroshi Kamimura1989 Volume 58 Issue 1 Pages 260-268
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe one-electron energy spectrum of a Penrose tiling lattice in a magnetic field is studied with a tight-binding Hamiltonian. We show the following remarkable results characteristic of a Penrose lattice. (1) The density of states in a magnetic field has a central peak with zero width at zero energy. It is shown that the zero-energy states correspond to the ring states in which wavefunction has nonvanishing amplitudes only at the sites circling the origin. (2) The magnetic field dependence of the energy spectrum shows a butterfly shape caused by Landau quantization. (3) The magnetic field dependence of the energy spectrum also shows a fractal nature. In particular it is characterized by two periods whose ratio is equal to the golden mean (1+\sqrt5)⁄2, and two periods comprising a Fibonacci sequence. We have clarified the origin of this fractal behavior of the energy spectrum analytically.View full abstractDownload PDF (1352K) -
Takahito Saito, Kazushige Nomura, Kenji Mizoguchi, Kiyoshi Mizuno, Kiy ...1989 Volume 58 Issue 1 Pages 269-278
Published: January 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSWe have studied ESR, 1H NMR and 13C NMR in ternary graphite intercalation compounds C8KH0.61 prepared from the highly oriented pyrolitic graphite (HOPG). Although it has been controversial whether the hydrogen atom has a localized moment, our experiment proves non-existence of the localized moment. It is shown that the absorbed hydrogen molecules are dissolved into an atomic state and that the hydrogen atoms have a metallic character. The electronic state of hydrogen atoms and their geometrical arrangement are discussed.View full abstractDownload PDF (1064K) -
Yuuji Horie, Yuichiro Terashi, Shoichi Mase1989 Volume 58 Issue 1 Pages 279-290
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTemperature dependences of an ultrasonic attenuation coefficient α(T) and sound velocity Vs(T) have been measured for high-Tc superconductors (RE)Ba2Cu3O7 (RE=Y, Nd, Sm, Dy, Er). On increasing the ionic radius from Er to Nd, the following was found: (i) The increase of the Tc is found to be \lesssim1 K. (ii) The peak positions in α(T) versus T curves which correspond to the energies of optical phonons in a low-energy region show an increase by ∼10%. This change may be associated with the increase of the lattice constants by ∼1%. (iii) The sound velocity becomes larger, but the change is mainly caused by the difference in the degree of filling of the crystals. Using a comparison of the calculated results of phonon dispersion curves by Yasuda and Mase, a brief discussion is presented regarding the relation between the change of phonon spectra and that of Tc within the BCS-McMillan scheme.View full abstractDownload PDF (1412K) -
Yutaka Nakai, Masayuki Takagishi, Nobuhiko Kunitomi1989 Volume 58 Issue 1 Pages 291-294
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe magnetic phase diagram of the mixed system of Au(Cr) and Au(Fe), Au1−x(CryFe1−y)x, has been determined by the measurements of the magnetic susceptibility and of the Bragg reflection of neutron scattering. At the nearly equiatomic compound of Cr and Fe, y\simeq0.6, the spin glass state is stable up to the phase boundary of the fcc ternary alloy x\simeq0.28, far beyond the percolation limit. The extension of the spin glass region may be determined due to the competition between the ferromagnetic and the antiferromagnetic nearest-neighbor interactions which are responsible for the formation of the ferromagnetic and the antiferromagnetic long-range order in the Au(Fe) and the Au(Cr) alloys, respectively.View full abstractDownload PDF (384K) -
Syuji Kawada1989 Volume 58 Issue 1 Pages 295-300
Published: January 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDielectric properties of KOH-doped D2O ice were studied experimentally on polycrystalline samples. A monodispersive dielectric dispersion was obtained by annealing at 250 K (−20°C). The phase transition was observed at 76 K but the decrease of the static dielectric constant indicating a degree of order in deuteron ordering was small. By deuteration, the transition temperature was raised by 4 K and the activation energy was also raised to 2.1 eV, but the fundamental relaxation time in the Arrhenius expression was not altered. From these results, some correlation between the magnitude of the activation energy and the proton (or deuteron) ordering is deduced as an experimental fact.View full abstractDownload PDF (588K) -
Keiichi Edamatsu, Takao Nanba, Mikihiko Ikezawa1989 Volume 58 Issue 1 Pages 301-313
Published: January 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe anisotropic reflection spectra of K2CuCl3 and K2CuBr3 have been measured in the range from 4 to 26 eV using synchrotron radiation. The optical constants have been obtained through the Kramers-Kronig analysis and compared with the calculated interband transition probability. The first fundamental absorption bands at about 4.5 eV are interpreted as being due to the excitons of the Frenkel type tightly bound on a cuprous ion. The absorption bands in the range from 6 to 12 eV are probably caused by the virtual excitons with holes in the p-bands of halogen ions. The anisotropic absorption bands due to the core excitons of potassium ions have been found around 20 eV. There is no clear structure due to plasmons of the valence electrons in the energy loss spectra.View full abstractDownload PDF (1356K) -
Keiichi Edamatsu, Takao Nanba, Mikihiko Ikezawa1989 Volume 58 Issue 1 Pages 314-328
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe anisotropic reflection spectra of K2AgI3, Rb2AgI3 and Rb2AgBr3 have been measured in the range from 4 to 26 eV using synchrotron radiation. The optical constants have been obtained through the Kramers-Kronig analysis. The characters of the band edge excitons of K2AgI3 and Rb2AgI3 are very similar to those of the alkali iodides. However, the perturbation calculation has indicated that the spin-orbit interaction scarcely affect the outline of the valence band structure of Rb2AgI3 and that no spin-orbit doublet appears in the absorption spectra. The anisotropic absorption due to the core excitons of K+ or Rb+ have been found around 20 or 17 eV, respectively. The prominent structures due to plasmons of valence electrons have been found at 10–12 eV in the energy loss spectra.View full abstractDownload PDF (1508K) -
Minoru Itoh1989 Volume 58 Issue 1 Pages 329-334
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWhen the tetragonal III phase of NH4Br crystals is “frozen” upon rapid cooling from room temperature down to 10 K, a new luminescence appears at 3.0 eV in addition to the 4.18 eV luminescence arising from self-trapped excitons in the cubic IV phase. This luminescence band is found to decrease in intensity with a complementary increase of the 4.18 eV band as the crystal is warmed above 50 K. Measurements of the excitation spectrum, decay time and linear polarization confirm that the 3.0 eV luminescence is due to a radiative transition from the triplet state of self-trapped excitons in the III phase structure involving the displacement of Br− ions from their cubic lattice sites.View full abstractDownload PDF (764K) -
Derivation of Envelope (de Broglie) Solitons for Non-Linear Klein-Gordon Equation by Hirota’s MethodB. V. Baby, A. O. Barut1989 Volume 58 Issue 1 Pages 335
Published: January 15, 1989
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (132K) -
K. Madhukar, B. Madhu, B. A. Sastry, G. Ponticelli, M. Massacesi1989 Volume 58 Issue 1 Pages 336-337
Published: January 15, 1989
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDownload PDF (260K)
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