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- Proceedings of the Physico-Mathematical Society of Japan. 3rd Series
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Volume 56, Issue 2
Displaying 1-50 of 61 articles from this issue
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Fukuko Yuasa1987 Volume 56 Issue 2 Pages 423-424
Published: February 15, 1987
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSBy means of the Bäcklund transformation, it is shown that the Casorati determinant form of N-soliton solution of the two-dimensional Toda lattice generates (N+1)-soliton solution successively for increasing N.View full abstractDownload PDF (152K) -
Chun-Yuan Yang, Hiroaki Itakura, Shigetake Horie, Yoshimi Tsuchiya, Ta ...1987 Volume 56 Issue 2 Pages 425-428
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAn evolution process has been investigated for the angle-deflective oscillation of the stripe pattern by changing suddenly an applied voltage across a thin layer of nematic liquid crystal from a sub-threshold voltage to an above-threshold voltage. An averaged time course of the amplitude of the oscillation and its course fluctuation have been obtained from data for the evolution processes repeated for an applied voltage. Anomalies in the course fluctuation have been found in an intermediate stage of the evolution process. Evolution processes for various applied voltages, also, have been investigated and every averaged time courses have been found to be expressed by a scale function.View full abstractDownload PDF (352K) -
Katsuhisa Koura1987 Volume 56 Issue 2 Pages 429-432
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA mass scaling rule for the electron (of mass m) swarm in rare gases (of atomic mass M) under the influence of the electric (E) and magnetic (B) fields is deduced on the basis of the two-term approximation of the Boltzmann equation. By carrying out the Monte Carlo simulation (MCS) of the electron swarm in He (B=0), the scaling rule is verified to be valid for the mass ratio m⁄M\lesssim10−2. The mass scaling rule indicates that the MCS with an unrealistically large value of m⁄M(\lesssim10−2) for the reduction of the computation time is valid in the two-term approximation with the error of the order of m⁄M after the initial transient stage.View full abstractDownload PDF (376K) -
Yukiharu Ohsawa1987 Volume 56 Issue 2 Pages 433-436
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe fraction of ions trapped by a laminar magnetosonic shock wave is evaluated theoretically. The heating rate due to the resonant ion acceleration is then obtained in terms of the Mach number and upstream plasma parameters. In addition, it is shown that, in spite of the large positive potential in the shock region, a laminar shock can reflect some electrons, as well as ions, because of the magnetic mirror effect.View full abstractDownload PDF (396K) -
Satoshi Sasaki, Katsuhiro Tsukimura1987 Volume 56 Issue 2 Pages 437-440
Published: February 15, 1987
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA new analysis method of X-ray resonant scattering diffraction data has been proposed to pinpoint the atom of a specific kind as if X-rays interact only with the electrons at some specific energy levels instead of a mass of electrons. Using synchrotron X-rays near K-absorption edges, the positions of K-shell electrons, rather than the average atomic positions, were estimated independently for each of Co, Ni and Zn atoms in a long-range ordered crystal, (Co, Ni, Zn)SiO3. The positional shifts from the average and aspherical distributions of atoms have been observed.View full abstractDownload PDF (540K) -
Sasuke Miyazima, Tomoyasu Tanaka1987 Volume 56 Issue 2 Pages 441-443
Published: February 15, 1987
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDiffusion limited aggregation is generalized to include a method of ensemble average, and is applied to the simulation of a snowflake as an example.View full abstractDownload PDF (512K) -
Fumio Takagi, Kazuhiko Kawakami, Itaru Maekawa, Yoshio Sakai, Nobuo Ts ...1987 Volume 56 Issue 2 Pages 444-447
Published: February 15, 1987
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSMagnetic susceptibility of LixZn1−xV2O4 was measured in a temperature range 80 to 300 K. It is believed that a metal-insulator transition occurs in this system. Nevertheless the susceptibility obeyed the Curie-Weiss law in the whole composition range. The effective Bohr magneton number p and the Weiss temperature θ were very large for ZnV2O4 and p=5.4 per molecule and θ=990 K. They decreased rapidly with an increase in Li content toward the metal-insulator transition. In the region where the oxide is metallic, the change was gradual. The rapid decrease in the insulator region was attributed to the dielectric screening by mobile electrons.View full abstractDownload PDF (484K) -
Daijiro Yoshioka, Yasuhiro Iye1987 Volume 56 Issue 2 Pages 448-451
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt is known that energy spectrum of electrons in a magnetic field with periodic potential has a very peculiar feature. Here apparently different problem, the energy spectrum in a uniform potential but with a periodically modulated magnetic field, B(r)=B0+ΣQBQeiQr, is investigated theoretically. It is shown that the effect of the modulation is equivalent to that of a periodic potential. For the realization of the modulation use of superconductor is suggested. Possibility to observe the spectrum is discussed.View full abstractDownload PDF (432K) -
Hiromi Ogawa, Eiji Kita, Yoichi Mochida, Kay Kohn, Shigeyuki Kimura, A ...1987 Volume 56 Issue 2 Pages 452-455
Published: February 15, 1987
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSFirst order magnetoelectric effect was observed at 77 K in an yttrium iron garnet (YIG) single crystal, when it was cooled down in both electric and magnetic fields simultaneously. The sign of observed signal was inverted when the electric field during cooling was reversed. The signal disappeared continuously around 130 K. This result indicates that YIG has a phase transition at the temperature below which the structure lacks the centre of inversion.View full abstractDownload PDF (352K) -
Shozo Takeno, Shigeo Homma1987 Volume 56 Issue 2 Pages 457-466
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA sinh-lattice (SHL) equation sinh (un+1−un)−sinh (un−un−1)−\ddotun=0 or (d2⁄dt2) ln [(1+vn2)1⁄2+vn]=vn+1+vn−1−2vn with vn=sinh (un−un−1), which is a version of a kink-generating sine-lattice (SL) equation sin (un+1−un)−sin (un−un−1)−\ddotun=0, is studied. It is shown both analytically and numerically that the SHL equation yields, though not mathematically exact, but well-defined, one-and two-soliton solutions for soliton wave number k up to k\simeq1.0. In such regime the equation obeyed by vn share the soliton-generating properties with the Toda lattice equation (d2⁄dt2) ln (1+vn)=vn+1+vn−1−2vn. A brief discussion is given on connection of the SHL equation with the Toda lattice equation, the SL equation and the modified KdV equation.View full abstractDownload PDF (1048K) -
Kazuhiro Fukushima, Tomoji Yamada1987 Volume 56 Issue 2 Pages 467-473
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDynamical behaviors of a pinned sine-Gordon soliton are studied numerically by solving a damped sine-Gordon equation in the external periodic force. In this paper, a partial differential equation is directly solved instead of the reduced system with the perturbation theory. Chaotic motion occurs through the sequence of the period-doubling bifurcation. Numerical results show the agreement with those by the perturbation method. This chaos localizes around the pinning point. Spatial dependence of the intensity of chaos is investigated.View full abstractDownload PDF (716K) -
Hikaru Kawamura1987 Volume 56 Issue 2 Pages 474-491
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPhase transition of frustrated Heisenberg antiferromagnet on the three-dimensional layered-triangular lattice is studied via a symmetry argument and Monte Carlo simulations. A symmetry argument shows that the order-parameter space of this model is isomorphic to the three-dimensional rotation group SO(3) or the projective space P3, different from those of the corresponding nonfrustrated systems. The possibility is suggested that the system exhibits a novel type of phase transition characterized by its SO(3) symmetry. Extensive Monte Carlo simulations indicate the occurrence of a single continuous transition. By applying the finite-size scaling, respective exponents are estimated as α\simeq0.4, β\simeq0.25, γ\simeq1.1 and ν\simeq0.53. These values differ considerably from those for the standard nonfrustrated systems strongly suggesting a phase transition belonging to a new universality class. Several systems, including the superfluid A phase of helium 3, certain types of helical or canted magnets, are predicted to belong to the same universality class. Possible consequences for experiments are discussed.View full abstractDownload PDF (1732K) -
Katsuhiko Nishimura, Susumu Ohya, Takafumi Tadokoro, Naoshi Mutsuro1987 Volume 56 Issue 2 Pages 492-494
Published: February 15, 1987
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe g-factor of the 1+ isomeric state of 9.3 m 178Ta has been measured using the technique of nuclear magnetic resonance on oriented nuclei at about 7 mK. The magnetic hyperfine-splitting frequency was determined to be 201.56(22) MHz for zero external magnetic field in Ni. With a magnetic hyperfine field Bhf=96.5(3) kG, the g-factor was derived as |g(178Ta, 1+)|=2.740(12).View full abstractDownload PDF (276K) -
Yasufumi Suzuki, Takeomi Kaneko, Michio Tomita, Masakatsu Sakisaka1987 Volume 56 Issue 2 Pages 495-501
Published: February 15, 1987
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe cross sections of collisional dissociation and electron capture have been measured for CO+ and CF+ ions on He, Ne and Ar atoms in the energy range from 4 to 16 keV. Most of the values are interpreted in a common framework of classical one electron model. The electronegative properties of C, O and F appear when the projectile ions dissociate simply.View full abstractDownload PDF (664K) -
Hideki Yamazaki, Shoichi Kai, Kazuyoshi Hirakawa1987 Volume 56 Issue 2 Pages 502-505
Published: February 15, 1987
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSWe describe the results of microscopic observation on formation of the chevron in the dielectric regime of electrohydrodynamic instability. The visible pattern is due to a convective flow with very small scale near the electrodes unlike an idea of Orsay liquid crystal group. Formation process of the chevron resembles to that of fluctuating Williams domain (WD) from WD.View full abstractDownload PDF (948K) -
Sigeo Yomosa1987 Volume 56 Issue 2 Pages 506-520
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIn order to elucidate the dynamical features of the pulsatile blood flow in large arteries, we propose a soliton theory for a simplified and an idealized model-system of the blood motion in large blood vessels. The theory is performed for an infinitely long, straight, circular, homogeneous thin-walled elastic tube filled with an ideal fluid. It is shown the pulse waves of pressure and flow propagating through the arteries can be described as solitary waves excited by cardiac ejections of blood and the features of the pulse wave such as “peaking” and “steepening” are interpreted in the viewpoint of soliton. The clinical importance of the “lowest blood pressure” and the “pulse-pressure”, which corresponds to the amplitude of pressure pule-wave, is physically explained by the formula obtained from our theory.View full abstractDownload PDF (1684K) -
Iwao Hosokawa, Kiyoshi Yamamoto1987 Volume 56 Issue 2 Pages 521-534
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe integral over the wavenumber space in the Hopf characteristic functional equation is approximated by a Monte Carlo quadrature so that the continuous dynamical degrees of freedom may be replaced by a finite number of discrete ones. The dynamics to govern the discrete variables (i.e. the sampled velocity modes) is built in such a way that the invariance properties of the original Navier-Stokes equation for incompressible inviscid flow are exactly preserved. A realization of flow based on this dynamics gives a plausible power law of energy decay and the −5⁄3 power law of energy spectrum with a proper Kolmogorov constant for Reynolds numbers 100∼500.View full abstractDownload PDF (1392K) -
Isamu Ogawa, Kazuo Kawahata, Yuichi Ogawa, Tetsuo Watari, Nobuaki Noda ...1987 Volume 56 Issue 2 Pages 535-543
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSpectroscopic and bolometric measurements with spatial and temporal resolution show that large radiation loss brings about the decrease in electron and ion temperature and plasma energy. Regarding emissivity in a core plasma, the result by bolometric measurements well agrees with that estimated from impurity abundance and radiative cooling rates. Carbon limiters have an effect to suppress the radiation loss for Ohmic plasma, but is insufficient for ICRF heated plasma. The main contribution to radiation loss may be attributed to Fe impurity released from the ICRF antennae, the Faraday shield and vacuum vessel. By making carbonization, the Fe impurity is suppressed to a low level (nFe⁄ne∼0.03%) and the radiation loss is reduced to Prad⁄(POH+Pfr)∼20%. This clearly supported by the observation of Zeff (3.9→1.2).View full abstractDownload PDF (1080K) -
Mitsuhiro Nambu1987 Volume 56 Issue 2 Pages 544-553
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe plasma-maser effect corresponds to the vertex correction in standard weak turbulence theory. The growth rate of the Langmuir wave in a weakly nonstationary medium with nonsteady ion-sound turbulence is obtained. The Langmuir wave instability occurs through the imaginary part of the nonlinear dielectric constant. For electrostatic waves without the applied magnetic field, the instability comes from the direct mode-mode coupling term even for the nonsteady ion-sound turbulence.View full abstractDownload PDF (800K) -
Tadashi Kurihama, Takatoshi Izumi, Shozo Sawada1987 Volume 56 Issue 2 Pages 554-559
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFerroelastic transformation twins in LiRbSO4 were observed by means of X-ray diffraction and the polarizing microscope. It has been found that {110} and {130} twins can be induced in an untwinned crystal by applying an electric field at room temperature in the paraelectric phase. This ferroelastic twin wall motion results from an electrostrictive effect. The same effect can also be observed in (NH4)2SO4 crystals. These electrically driven wall motions are the first example of its type among ferroelastic crystals.View full abstractDownload PDF (820K) -
Tatsuo Kanashiro, Yoshitaka Michihiro, Junichi Ozaki, Takashi Ohno, Ak ...1987 Volume 56 Issue 2 Pages 560-564
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe velocities of 10 MHz-longitudinal and 15 MHz-transverse waves have been measured by a pulse-echo-overlap method from the transition temperature (157 K) to 500 K in a polycrystal of β-phase Ag3SI. The attenuation measurements of longitudinal waves have also been done at 10, 30 and 50 MHz over the temperature range 157 K–300 K. The results are compared with a theory taking into account the coupling between the pseudospin fluctuations and the acoustic phonons. The activation energy of 0.15 eV and the attempt frequency of 1.8×1012 Hz are obtained for the hopping of mobile silver ions.View full abstractDownload PDF (584K) -
Susumu Ikeda, Noboru Watanabe1987 Volume 56 Issue 2 Pages 565-576
Published: February 15, 1987
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSHydrogen local modes in metal hydrides of TaH0.1, NbH0.31, VH0.33 and TiH2 have been measured up to about 1 eV using a high-resolution TOF-type neutron spectrometer coupled with a pulsed spallation neutron source. Measured spectra are discussed in terms of a simple anharmonic parameter. Hydrogen potentials V(x, y, z) for NbH0.31 and VH0.33 are derived using experimental values.View full abstractDownload PDF (1216K) -
Yasuhiro Ono, Tomoyuki Hikita, Takuro Ikeda1987 Volume 56 Issue 2 Pages 577-588
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMixed crystals of potassium dihydrogen phosphate and ammonium dihydrogen phosphate (K1−x(NH4)xH2PO4) have been investigated. Dielectric constants ε11 and ε33 and elastic compliance (s45°−Z) on the 45°−Z-cut bars were measured. The crystals with 0≤x\lesssim0.17 show temperature dependence of the dielectric constant ε33 and elastic compliance s45°−Z similar to that of pure KH2PO4. Occurrence of the spontaneous polarization in these crystals was observed by pyroelectric charge method. The crystals with 0.85\lesssimx≤1 show dielectric and elastic properties similar to those of pure NH4H2PO4, except for weak rounding-offs in the anomalies of dielectric constant for smaller x. It was confirmed by X-ray diffraction that the crystal with x=0.85 undergoes an antiferroelectric phase transition. The crystal with x=0.25 shows broad and round-off anomalies in ε33 and s45°−Z similar to the temperature dependence of ε33 in Rb0.66(NH4)0.34H2PO4 crystal which is reported to show glassy dielectric behavior.View full abstractDownload PDF (1116K) -
Hirotaka Yamaguchi, Hiromoto Uwe, Tunetaro Sakudo, Etsuro Sawaguchi1987 Volume 56 Issue 2 Pages 589-595
Published: February 15, 1987
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe Raman spectrum of hexagonal BaTiO3 has been investigated in the temperature range from 2 K to room temperature. Below the structural-phase-transition temperature of Ta(∼222 K), we find the corresponding underdamped soft-phonon modes; the mode frequencies are proportional to (Ta−T)β with β∼1⁄3 in a wide temperature range (0.5<T⁄Ta<0.95). Although, in the ferroelectric phase below Tc(∼74 K), several new features are observed, no soft mode which correlates with the ferroelectric transition is found.View full abstractDownload PDF (724K) -
Ikuo Suzuki, Yoshihiro Ishibashi1987 Volume 56 Issue 2 Pages 596-602
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe electric field induced phase transitions are discussed in the improper ferroelectrics and ferroelastics, where the high symmetry phase is assumed to be piezoelectric as in the gadolinium molybdate (GMO). The dependence on the electric field of the polarization is discussed, and the D-E hysteresis loops are compared with the one experimentally observed in GMO.View full abstractDownload PDF (648K) -
Kêitsiro Aizu1987 Volume 56 Issue 2 Pages 603-611
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThree possible types of simultaneously incommensurate and ferroelectric phases have been proposed hitherto. In this paper a fourth type is proposed. Ferroelectric incommensurate phases of this type are due to relation P=J(QαQα*−QβQβ*) or, more generally, P=f(|Qα|2, |Qβ|2, |Qγ|2, …), where P denotes a polarization component; J is a mere coefficient; Qα, Qα*, Qβ etc. compose a degenerate set of order parameters; f is a function of any number of order parameters depending only on their absolute values and not on their arguments. These ferroelectric incommensurate phases, unlike those of the former three types, can succeed prototypic phases by second-order transition. Two imaginary examples of ferroelectric incommensurate phases of the fourth type are presented and investigated. In one of them the ferroelectric direction is perpendicular to the incommensurate direction, while in the other the two directions are parallel.View full abstractDownload PDF (976K) -
Susumu Kurita, Yoshiharu Tazaka, Kuniro Tsushima1987 Volume 56 Issue 2 Pages 612-618
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe magnetic phase transition from the antiferromagnetic to the weak-ferromagnetic states in ErCrO3 induced by the pulsed laser irradiation is studied dynamically with a spectroscopic method. The time necessary for completing the phase transition is 0.7 μs when Er3+ ions in the antiferromagnetic ErCrO3 are selectively excited by the tunable dye laser, in contrast with 0.4 μs when Cr3+ ions are excited by a ruby laser. The time is also measured under the various combination of temperature, excitation laser power and magnetic field applied along the c axis. It is found out that the Er–Cr magnetic interaction contributes mainly to the photo-induced phase transition. Their spin-spin relaxation time is obtained to be about 0.4 μs at 2 K.View full abstractDownload PDF (932K) -
Fujio Kakinuma, Satoru Ohno1987 Volume 56 Issue 2 Pages 619-628
Published: February 15, 1987
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe measurements of heat capacity were made for liquid Se–Te mixtures using an adiabatic scanning calorimeter. Liquid SexTe1−x mixtures with x=0.2 to 0.6 exhibit maxima in the temperature dependence of heat capacity. The position of heat capacity maximum shifts toward higher temperature with increasing Se concentration. The plots of heat capacity against conductivity show a maximum in the range of 150 to 400 (ohm·cm)−1. It indicates that the bonding rearrangement is most active in this range of conductivity. A strong correlation is found between the heat capacity and the temperature dependence of magnetic susceptibility. In the semiconducting region, the large excess heat capacity can be attributed to the formation of dangling bonds. In the metallic region, the excess heat capacity can be related to the change in the density of states caused by the bonding rearrangement.View full abstractDownload PDF (996K) -
Yasunari Kurihara1987 Volume 56 Issue 2 Pages 629-631
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTunneling of dislocations in bcc 3He is discussed from the stand point of Zener tunneling theory. In this tunneling penetrate Fermi particles of the massive thirring model which is equivalent to the Frenkel-Kontorova model. Quantum corrections are important in determing the energy value of solitons, i.e., penetrating Fermi particles which have weak attractive interactions.View full abstractDownload PDF (284K) -
Takao Yamamoto, Takeo Izuyama1987 Volume 56 Issue 2 Pages 632-640
Published: February 15, 1987
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe facet edge of the crystal is investigated theoretically on the basis of the Terrace-Step-Kink (TSK) model. The statistical mechanics of this model is formulated in terms of the lattice Fermion approach. The analysis leads always to the Pokrovsky-Talapov-Gruber-Mullins transition. At the facet edge, the facet connects with the neighboring curved surface without discontinuity of the slope. In such model the lattice underlying the surface is assumed to be rigid without any deformation caused by emergence of the steps. We extend the TSK model to a more general model including relaxation of the lattice bonds caused by the steps. The lattice deformation increases the elastic energy but can decrease the step creation energy. We show that the extended model leads always to a sharp edge; there is a discontinuity of the slope at the facet edge.View full abstractDownload PDF (1092K) -
Huzio Nakano1987 Volume 56 Issue 2 Pages 641-648
Published: February 15, 1987
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA molecular theory of the crystal-melt interface is developed on the basis of statistical mechanical investigation of melting. From that point of view, the physical basis of existing conventional theories is explained, by paying a particular attention to Cahn’s theory. On the way, the physical meaning of the Ising model appearing as a basic idea in those theories is clarified by comparing with the theory of ferromagnetism, and in consequence, the expressions for the relevant parameters in those theories are given in terms of the integrals concerning the pairwise potential between component atoms which are essential in understanding the melting. An important mathematical analogy between the present theory and the theory of ferromagnetism is effectively taken into consideration. At the same time, certain fundamental differences in physical interpretations existing between the both theories are emphasized.View full abstractDownload PDF (920K) -
Osamu Aita, Kouichi Ichikawa, Masao Kamada, Makoto Okusawa, Hatsuo Nak ...1987 Volume 56 Issue 2 Pages 649-654
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe rare-earth N4,5 absorption spectra of rare-earth compounds RCl3 (R=La, Ce, Sm, Eu and Gd) and RB6 (R=La and Sm) were measured to obtain the information on the excited state 4d94fn+1 of these substances, where n equals the number of the 4f electrons in the ground state. The structures of the absorption spectra are well explained by the multiplet states of the 4d94fn+1 configuration in the final state. The Sm N4,5 absorption spectrum of SmB6 shows no distinct indication due to the Sm2+ ion regardless of the valence mixing between the Sm2+ and Sm3+ ions. The absorption structure corresponding to the Sm2+ ion may be smeared owing to the autoionization process of the excited state 4d94f7 of the Sm2+ ion because this state is located above the 4d ionization threshold of the Sm2+ ion.View full abstractDownload PDF (748K) -
Keiko Katoh, Kazuko Motizuki1987 Volume 56 Issue 2 Pages 655-670
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSStructural transformation of transition-metal monopnictides and monochalcogenides from the NiAs type to the MnP type is studied microscopically by calculating matrix elements of the electron-lattice interaction on the basis of the electronic bands obtained by the self-consistent augmented-plane-wave (APW) method. From the results of the calculation we can explain why a structural phase transition from the NiAs type to the MnP type occurs in MnAs, CrAs and VS but not in MnSb, CrSb and TiSe.View full abstractDownload PDF (1344K) -
Shin-ichiro Nagasaka, Tadanobu Kojima1987 Volume 56 Issue 2 Pages 671-677
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSInterionic potentials based on the charge-transfer (CT) model are shown to reproduce both the observed molecular constants and the observed cohesive energy of crystals equally well, with a reasonable value of ionicity, in copper- and silver-halides as was the case in alkali halides. The model is less satisfactory in thallium halides, but can be improved by incorporating the effect of an intraionic excitation of T1+ with the original CT model. A new picture of the interaction revealed through the CT models is discussed.View full abstractDownload PDF (944K) -
Katsurou Hanzawa, Kosaku Yamada, Kei Yosida1987 Volume 56 Issue 2 Pages 678-690
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIn order to calculate magnetoresistances due to the Ce impurities coupled with conduction electrons by the s-f exchange interaction, conditions for determining the number of local conduction electrons around Ce are given, which are valid for arbitrary spin-orbit and crystal-field splittings of Ce ion. General arguments for resistivity and magnetoresistance are given. In order to discuss the resistivities and magnetoresistances of the dense Kondo Ce compounds quantitatively, we adopt the Yosida theory and carry out the wave number integration numerically. It is shown that the resistivity along the crystal c-axis becomes small for crystalline fields with tetragonal or hexagonal symmetry and that a peak of magnetoresistance is expected due to the Kondo effect re-enhancement.View full abstractDownload PDF (1400K) -
Fumio Komori, Satoshi Okuma, Shun-ichi Kobayashi1987 Volume 56 Issue 2 Pages 691-696
Published: February 15, 1987
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe inelastic scattering time of electrons and the metal-insulator transition are studied in disordered thick bismuth films. In weakly disordered films, the anti-localization effect is observed, and dimensional crossover of the inelastic scattering between two and three is demonstrated by changing the thickness of the films. The critical exponent of the metal-insulator transition in this system which represents a disordered metal with strong spin-orbit interaction is examined and fixed to be unity. This indicates that the transition is governed by the electron-electron interaction.View full abstractDownload PDF (672K) -
Shin’ichi Katayama, Sadamichi Maekawa, Hidetoshi Fukuyama1987 Volume 56 Issue 2 Pages 697-705
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSKondo-like effect on the low temperature resistivity associated with off-center Ge ions in Pb1−xGexTe is theoretically explored. The tunneling motion of Ge ions between two equivalent sites along the [111] direction is introduced by means of the so-called two-level description. The observed nearly logarithmic temperature dependence of resistivity in Pb1−xGexTe is ascribed to the strong coupling limit of the scaling of the interaction between carriers and the two-level system. In the presence of the structural phase change, the asymmetry of the double-well potential of Ge ions is induced. The freezing of scaling process at the energy comparable to splitting between two-levels leads to a drastic decrease of the logarithmic portion of resistivity below the critical temperature of the structural phase change.View full abstractDownload PDF (1088K) -
Motohiko Saitoh1987 Volume 56 Issue 2 Pages 706-712
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSGeneral formulae for the free energy and the conductivity in the presence of a magnetic field are obtained for the system of electrons in a two-dimensional Wigner crystal on the surface of liquid He when the electrons interact with the surface roughness created by ripplons. The dc magneto-resistance is calculated explicitly and is shown to differ qualitatively from the result for the independent electron system.View full abstractDownload PDF (744K) -
Fusayoshi J. Ohkawa1987 Volume 56 Issue 2 Pages 713-721
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAn electron-phonon interaction in Kondo lattices is theoretically investigated. It is significantly screened by the Kondo effect, while the Thomas-Fermi type screening is weak in spite of a large specific heat coefficient. These features are owing to the reduction of the charge susceptibility by the Kondo effect. It is argued that the attractive interaction between adjacent f electrons due to one-phonon exchange can overcome the on-site repulsive interaction due to Coulomb correlation for reasonable values of physical parameters, when ligands are composed of many ions, i.e., clusters, and modes besides the center of mass contribute to one-phonon exchange.View full abstractDownload PDF (1084K) -
Satoru Noguchi, Kiichi Okuda, Yasuo Takigawa, Minoru Yamada, Makoto Ho ...1987 Volume 56 Issue 2 Pages 722-730
Published: February 15, 1987
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSSuperconducting and magnetic properties of the Chevrel compounds CexLa1−xMo6S8 were investigated by electrical resistance, magnetoresistance and magnetic susceptibility in a temperature range down to 0.4 K. Superconducting properties with low x are well explained by the matsuura-Ichinose-Nagaoka theory based on the Kondo effect with a range of TK⁄Tc0=0.01∼0.001. The magnetic susceptibility per mol Ce is independent of the Ce concentration and it is explained by the crystal field splitting and Kondo effect. A model of crystal field splitting which consists of three doublets with the excited energy of 10 K and 400 K in CeMo6S8 is proposed. A large negative magnetoresistance was found below 10 K for CeMo6S8. Magnetic and superconducting phase diagram of CexLa1−xMo6S8 was determined.View full abstractDownload PDF (912K) -
Takayoshi Takeda, Tsutomu Watanabe, Shigehiro Komura, Hironobu Fujii1987 Volume 56 Issue 2 Pages 731-735
Published: February 15, 1987
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSMagnetic measurements were made on the cubic perovskite-type SrFe1−xCoxO3 (0≤x≤0.2). It was observed that with decreasing x the paramagnetic Curie temperature θp and the Curie temperature TC decrease and the Néel temperature TN of the screw phase increases. It is argued from these results that the main magnetic interaction is ferromagnetic in this system (0≤x≤1) though antiferromagnetic interactions increase with decreasing x in the Fe-rich region (x<0.2). In the range of 0.05≤x≤0.15, local fluctuation of Co composition is considered to give rise to a magnetically inhomogeneous structure above TN: Co-rich regions tend to be ferromagnetic and Fe-rich local regions paramagnetic.View full abstractDownload PDF (528K) -
Magnetic Interaction and Phase Transition in the Organic Free Radical TANOL in Hydrostatic PressuresKazuyoshi Takeda, Norikiyo Uryû, Mitsuru Inoue, Jun Yamauchi1987 Volume 56 Issue 2 Pages 736-741
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSHydrostatic pressure dependence of the magnetic transition temperature TN(p) and interactions in the organic free radical TANOL(2,2,6,6-tetramethyl-4-piperidinol-1-oxyl), a quasi-one-dimensional Heisenberg antiferromagnet, has been studied by the heat capacity measurements in the pressure range p<6 kbar at low temperatures. The values (1⁄TN(p0))dTN(p)⁄dp\simeq0.15 kbar−1, (1⁄J(p0))dJ(p)⁄dp\simeq0.076 kbar−1 and (1⁄J′(p0))dJ′(p)⁄dp\simeq0.22 kbar−1 obtained here turn out to be the largest of the corresponding values in the magnetic systems ever studied, where J(p) and J′(p) are the intra- and inter-chain interaction constants, respectively (p0\simeq0.001 kbar). The dependence of these interactions on the distance between the adjacent magnetic spins is suggested much stronger than the usual 10-th power law for the superexchange mechanism in inorganic magnetic systems.View full abstractDownload PDF (676K) -
Hitoshi Yamazaki, Michinobu Mino, Hiroyuki Nagashima, Mike Warden1987 Volume 56 Issue 2 Pages 742-750
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBy parallel pumping experiments in ferromagnetic (CH3NH3)2CuCl4 chaotic auto-oscillations of magnon amplitude are observed at the pumping frequency of 9.39 GHz and the temperature of 1.65 K. Strange attractors constructed in three-dimensional phase space from time series data of chaotic oscillations display properties of stretching and folding of the sheet of trajectories. Fractal dimensions of strange attractors are obtained by the method of the correlation integral as a function of driving microwave power. With increasing driving power fractal dimension increases from 1.6 to 3.4. The largest Lyapunov exponent is obtained as 0.43±0.05 by using empirical return maps. The chaotic state arises directly from period-two oscillations without cascade of period doubling bifurcations.View full abstractDownload PDF (984K) -
Hiroaki Kadowaki, Koji Ubukoshi, Kinshiro Hirakawa1987 Volume 56 Issue 2 Pages 751-756
Published: February 15, 1987
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSSuccessive phase transitions of triangular lattice Heisenberg antiferromagnet with a small Ising anisotropy, CsNiCl3, are studied by neutron scattering. We have reexamined the temperature dependences of the z and xy components of sublattice magnetizations and also measured the both components of staggered susceptibilities. The character of the transitions is orderings and divergences of the z and xy components at independent temperatures.View full abstractDownload PDF (640K) -
Kohji Abe1987 Volume 56 Issue 2 Pages 757-767
Published: February 15, 1987
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe domain formation in KDP crystal has been investigated with optical observation and X-ray measurement under various conditions. It is found that the relation between the thickness d and the domain width w of c-plate crystals under nonelectroded conditions does not follow the well-known square-root law. In the region of d<1 mm, w obeys the relation w=a+\sqrta2+bd, whereas in the region of d≥1 mm, w is practically constant. In order to explain this result a domain formation model is proposed based on the spinodal decomposition with an interaction between the domain walls. The X-ray measurement reveals that the angle between the domain walls with (100) and (010) orientations is deviated slightly from 90° in the specimen eliminating the depolarizing field. This deviation is satisfactorily interpreted with the unequal volume fractions of positive and negative domains.View full abstractDownload PDF (2272K) -
Masayuki Yoshizawa, Takayoshi Kobayashi, Hitoshi Fujimoto, Jiro Tanaka1987 Volume 56 Issue 2 Pages 768-780
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe photoinduced absorption and bleaching of trans-(CH)x and trans-(CD)x in the nanosecond time region were investigated for the first time by time-resolved absorption spectroscopy. The transient absorption near the band gap and the bleaching of the interband transition were observed for both trans-(CH)x and trans-(CD)x. The absorption near the band gap saturated at ΔA⁄A0∼0.01. The decay of transient absorption at 4 K was fitted to \erf [(t⁄τ)−1⁄2] with τ=144±15 ns for trans-(CD)x and τ=305±27 ns for trans-(CD)x. When the temperature is increased, the decay kinetics are given by the same function with shorter time constants, τ=32±6 ns for trans-(CH)x and τ=40±6 ns for trans-(CD)x at 290 K. When the trans content in cis-rich film decreased, the time constant became longer. The decay kinetics is interpreted by interchain recombination of photoinduced polaron pairs.View full abstractDownload PDF (1704K) -
Takeshi Hattori, Hironori Araki, Shin-ichi Nakashima, Akiyoshi Mitsuis ...1987 Volume 56 Issue 2 Pages 781-787
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe ν1 band of PO4 tetrahedrons in Rb1−x(NH4)xH2PO4 mixed crystals has been measured in the temperature region from 30 K to room temperature by Raman spectroscopy. An anomaly has been found in the temperature dependence of the ν1 frequency of the mixed crystals. The glass-formation temperature (Tm) has been estimated for the mixed crystals. This value of Tm is higher than that estimated from the variation of the lattice constants. Raman scattering is useful to determine the onset temperature for the glass formation of those mixed crystals.View full abstractDownload PDF (780K) -
Shin-ichi Tanaka, Shojiro Takeyama, Noboru Miura, Shin-ichi Uchida1987 Volume 56 Issue 2 Pages 788-793
Published: February 15, 1987
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSFar-infrared magneto-reflection spectra were measured in HgTe in pulsed high magnetic fields up to 40 T applied along the ⟨100⟩ and the ⟨110⟩ crystal axes over a wide energy range 3.68–117 meV. Using a circularly polarized radiation, details of the spectrum structure were resolved. The anisotropy parameter γ2L−γ3L=2.2±0.2 was found to be larger than previously reported data.View full abstractDownload PDF (780K) -
Kazuhiro Hara, Akikatsu Sawada, Yoshihiro Ishibashi1987 Volume 56 Issue 2 Pages 794-797
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPressure dependence of Raman peaks of LaNbO4 in low frequency region is investigated up to ∼44.6 Kbar at room temperature. The lowest frequency mode shows a remarkable increase in frequency and a decrease in peak intensity, in contrast to two other peaks. As a result of the considerable frequency change of the lowest mode, the crossing with a higher frequency mode is observed.View full abstractDownload PDF (356K) -
Akio Kotani, Masato Okada, Takeo Jo, A. Bianconi, A. Marcelli, J. C. P ...1987 Volume 56 Issue 2 Pages 798-809
Published: February 15, 1987
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTheoretical analysis is made for spectra of the 3d core photoemission (3d-XPS) and 2p core photoabsorption (L3-XAS) in insulating La compounds La2O3, LaF3 and LaCl3 by using the single-site Anderson model. In order to give a consistent interpretation for 3d-XPS and L3-XAS, it is essentially important to take into account, in the final state of L3-XAS, the Coulomb interaction Ufd (between 4f and 5d electrons) and −Udc (between a 5d electron and a core hole) in addition to −Ufc (between a 4f electron and a core hole). A similar analysis is also presented for the intermetallic cornpound LaPd3.View full abstractDownload PDF (1184K)