Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
Volume 52, Issue 9
Displaying 1-49 of 49 articles from this issue
  • Yoshimasa Matsuno
    1983 Volume 52 Issue 9 Pages 2955-2958
    Published: September 15, 1983
    Released on J-STAGE: June 01, 2007
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    It is shown, by using a recurrence formula derived from the Bäcklund transformation of the Benjamin-Ono (BO) equation, that the functional derivative of a conserved quantity of the BO equation is a conserved density.
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  • Masumi Ohshima, Eisuke Minehara, Mitsuhiko Ishii, Takashi Inamura, Aki ...
    1983 Volume 52 Issue 9 Pages 2959-2962
    Published: September 15, 1983
    Released on J-STAGE: June 01, 2007
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    The ground-state rotational band in 167Er has been investigated through multiple Coulomb excitation with a 160-MeV 35Cl beam, Excited states up to 25/2+ were established by measuring γ-γ coincidences and γ-ray angular distributions. Nuclear lifetimes for levels up to spin 23/2 have been determined by analysis of Doppler broadened γ-ray lineshapes. Considerable signature dependence was observed in level energies and M1 transition probabilities.
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  • Akira Sakurai, Fumio Takayama
    1983 Volume 52 Issue 9 Pages 2963-2965
    Published: September 15, 1983
    Released on J-STAGE: May 29, 2007
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    Results of experimental and numerical investigations on the behaviour of spurting gas from a hole into air are analysed to show that a salient feature of the flow characteristics of the air can be described by the point source blast wave theory.
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  • Zong-Hao Lee, Koshichi Noto, Yoshio Muto
    1983 Volume 52 Issue 9 Pages 2966-2969
    Published: September 15, 1983
    Released on J-STAGE: May 29, 2007
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    An order-disorder phase transition was found in Chevrel-phase Ag1.6Mo6S8 at about 280 K. From the analogy of results of the electrical resistance and the X-ray diffraction to those in Cu1.8Mo6S8, this is thought to be a structural phase transition from rhombohedral to triclinic due to the order-disorder transition of Ag atoms.
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  • Minoru Tanaka
    1983 Volume 52 Issue 9 Pages 2970-2972
    Published: September 15, 1983
    Released on J-STAGE: June 01, 2007
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    The shear viscosity η is calculated in rapidly quenched states of a model of liquid rubidium by the molecular dynamics method. During the rapid-quenching process, η is propotional to kTD (Stokes’ law) down to about one third of the melting point Tm, while the proportionality does not hold at lower temperatures. The change of the slope of ln η vs 1⁄T suggests a structural change from supercooled liquid to a glassy state around Tm⁄3, which is consistent with the results of molecular dynamics calculations of the structure. The value of η is obtained as 0.58 cP just above Tm and reaches to 14.6 cP in the final quenched state around the liquid helium temperature.
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  • Tadashi Ishida, Hironobu Maeda, Nagao Kamijo, Kazuyuki Ueda
    1983 Volume 52 Issue 9 Pages 2973-2975
    Published: September 15, 1983
    Released on J-STAGE: May 29, 2007
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    In order to study the surface structure of a material, a method for detecting the extended appearance-potential fine-structure has been developed by measuring the peak-to-peak height of a particular Auger signal. Since Auger electron spectroscopy is highly sensitive to surface elements, the detection method is considered to be very useful to study atomic surface structures. The Fourier transform of the detected extended appearance-potential fine-structure curve of Fe(110) surface has exhibited a prominent peak at 2.47 Å, which is about 0.01 Å less than the nearest-neighbor bulk spacing in iron.
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  • Tsuyoshi Murao, Yosuke Nagaoka
    1983 Volume 52 Issue 9 Pages 2976-2978
    Published: September 15, 1983
    Released on J-STAGE: June 01, 2007
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    The structural energy associated with the Peierls instability in 1-D conductors can be expressed as δU=cA2+dA2, A being the order parameter. Because of the defendence of c on the Peierls-gap, the minimized δU still has the quadratic term of A in addition to the usual quartic term. However, it still holds that whether or not the Peierls transition takes place depends on the balance between the band-structure term and the electrostatic term in the pseudopotential theory.
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  • Kazushige Machida
    1983 Volume 52 Issue 9 Pages 2979-2980
    Published: September 15, 1983
    Released on J-STAGE: June 01, 2007
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    Effects of Fermi liquid parameters on upper critical field Hc2 are discussed theoretically. The Maki parameter which characterizes behavior of Hc2 in the presence of the Pauli paramagnetic effect is found to be renormalized by electron-electron interaction. Experimental data on a “heavy Fermion” superconductor CeCu2Si2 are analyzed.
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  • Mitsuo Wada, Morihiko Shibata, Akikatsu Sawada, Yoshihiro Ishibashi
    1983 Volume 52 Issue 9 Pages 2981-2982
    Published: September 15, 1983
    Released on J-STAGE: May 29, 2007
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    Single crystals of LiNaGe4O9 were grown by the Czochralski technique from stoichiometric melt. It has been found that LiNaGe4O9 shows ferroelectric activity in the a-direction below Tc=112.7 K. The spontaneous polarization is about 0.33 μC/cm2 at 110.3 K. The complex dielectric constants were measuredat 120 Hz, 1 kHz and 10 kHz as functions of temperature. The dielectric dispersion has been found in the above frequency region and explained by the critical slowing-down of the polarization relaxation process.
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  • Yasuo Nozue, Takayuki Hisamune, Takenari Goto, Haruki Tsuruta
    1983 Volume 52 Issue 9 Pages 2983-2985
    Published: September 15, 1983
    Released on J-STAGE: May 29, 2007
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    The emission properties of poly(N-vinylcarbazole) films have been investigated by the monochromatic light excitation at 4.2 K. The luminescence of the weakly bound excimer (the second excimer) shows the shift of the peak energy with varying the excitation energy. This phenomenon is interpreted as the amorphous properties of the carbazole chromophores of the polymer. It is elucidated that the excimer is the localized exciton relaxed by the inter-carbazole interaction at the excimer-forming site.
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  • Iwao Hosokawa, Tetsumi Tachibana, Kazuwo Imai
    1983 Volume 52 Issue 9 Pages 2986-2993
    Published: September 15, 1983
    Released on J-STAGE: June 01, 2007
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    With the recent explosive increase of cars, a modification of intersections of roads such as equipping them with extra short lanes only used by right-turning (for left-way traffic) cars has been prevailing in many cities and towns, for the purpose of saving total queuing time of cars that want to pass through intersections. Here, total waiting time of cars on one road is formulated for the cases with and without such a “right-turn branch” at an intersection. Reliability of the formulation is tested in comparison with direct observations made at one intersection in Morioka City. The ratio of total waiting times for both cases is given in a simple, practically useful form, if cars make sufficiently long queues in one and the opposite direction. It measures, in what traffic condition, how much economization of waiting time can be expected by the modification.
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  • Arihiro Togashi, Masuo Suzuki
    1983 Volume 52 Issue 9 Pages 2994-3002
    Published: September 15, 1983
    Released on J-STAGE: June 01, 2007
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    Here is presented a dynamic theory of spin glasses based on the extended mean-field theory of Thouless, Anderson, and Palmer. The kinetic equations for the magnetization and the spin correlation function are derived, from which dynamical linear and nonlinear susceptibilities are calculated and their low frequency behavior is mainly investigated. The spin self-correlation functions have different relaxation times near above and below Tc—the former is proportional to |TTc|−2, while the latter to |TTc|−4—which shows the asymmetric critical slowing down. A qualitative comparison of the present results with experimental data is presented.
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  • Tomohisa Mikado, Takio Tomimasu, Tetsuo Yamazaki
    1983 Volume 52 Issue 9 Pages 3003-3009
    Published: September 15, 1983
    Released on J-STAGE: June 01, 2007
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    Average energy losses (∈AV) were evaluated from total energy srectra. The total energy spectra F(E) are classified into two groups according to the composition procedure: (A) integrations of f(E, θ), representing energy spectra measured at various emission angles (θ) including backward angles, over θ and (B) crude estimates based upon f(E, 0°) with referring to relations between F(E) and f(E, 0°) for group A, where f(E, 0°) had been calculated by means of the Blunck-Leisegang-Westphal theory. The general trends of ∈AVtA vs tA, with tA being the corrected path length of the electrons in a material, obtained from F(E) for group B agree well with those for group A. The estimated values of ∈AVtA for C and Al are a little larger than those taken from the Berger-Seltzer table and those for Cu and Pb are a little smaller than the tabulated values.
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  • Hisao Uchiki, Hiroki Nakatsuka, Masahiro Matsuoka
    1983 Volume 52 Issue 9 Pages 3010-3018
    Published: September 15, 1983
    Released on J-STAGE: June 01, 2007
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    We analyze second harmonic generation in sodium vapor in a transverse magnetic field induced by the two-photon resonant excitation of the 3S–3D transition. The phenomenon is explained by the rotation of the two-photon induced quadrupole moment in the magnetic field. The analysis explains well the saturation of the intensity and rotation of the polarization of the second harmonic radiation in the higher magnetic field \gtrsim0.5 kG. The collisional decay rate of the coherence of the E1 forbidden transition has been measured as an application of this SHG.
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  • Takako Kato, Kuniaki Masai, Junya Mizuno
    1983 Volume 52 Issue 9 Pages 3019-3028
    Published: September 15, 1983
    Released on J-STAGE: June 01, 2007
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    Oxygen ions such as OIII, OIV, OV and OVII have metastable states, for example 2s2p3(5S), 2s2p2(4P), 2s2p(3P) and 1s2p(3P).
    When the electron density is high (ne>1010 cm−3), the population densities of metastable states also become high, and the intensities of emission lines and the populations of ionization states are affected by the collisions with electrons. We have studied the density dependence of the line emissions and ionization balance including the populated metastable states. We apply these results to the diagnostics of plasmas.
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  • Shuji Asaka, Hirofumi Yamada, Hiroki Nakatsuka, Masahiro Matsuoka
    1983 Volume 52 Issue 9 Pages 3029-3038
    Published: September 15, 1983
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    Backward photon echo and its decay were observed in the - transition of Na2 undergoing collisions with Ar buffer gas. By using the quantum mechanical transport equation, expressions of the various collisional cross sections are presented. The results are applied to the experimtent, and several kinds of cross sections are obtained for the Na2–Ar system. Furthermore by assuming the Gaussian collision kernel, two parameters of the population kernel are derived for the Na2()–Ar collisions.
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  • Michio Yamada, Kanefusa Gotoh
    1983 Volume 52 Issue 9 Pages 3039-3046
    Published: September 15, 1983
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    Evolution of the two-dimensional small disturbance superimposed on a viscous parallel shear flow is investigated under the beta-plane approximation of revolution. Formal solution is obtained for an arbitrarily localized initial distribution of vorticity. The eigenfunctions of the normal mode are proved to compose a complete set. In the region where the basic flow is uniform the eigenfunction of the continuous mode behaves as the Rossby wave. The interaction between the shear and the Rossby wave is found to be an inherent character of the eigenfunction of the continuous mode. The properties of the critical latitude of the Rossby wave are attributable to those of the friction layer in the eigenfunction.
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  • Mitsuhiro Tanaka
    1983 Volume 52 Issue 9 Pages 3047-3055
    Published: September 15, 1983
    Released on J-STAGE: June 01, 2007
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    The linear stability of steep gravity waves is investigated for superharmonic disturbances. As to this problem, Longuet-Higgins presented a conjecture that the gravity wave would become unstable to superharmonic disturbances at the steepness where the phase speed of the wave attains a maximum. Contrary to this conjecture, it is found that the instability first occurs at the steepness which corresponds to the maximum not of the phase speed but of the total energy and the impulse of the wave. This discrepancy implies the possibility of the superharmonic bifurcation of steady gravity waves in the region of large steepness.
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  • Masashi Kako, Tsutomu Ishimura, Tsuneo Amano
    1983 Volume 52 Issue 9 Pages 3056-3065
    Published: September 15, 1983
    Released on J-STAGE: May 29, 2007
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    Two-dimensional equilibria of field-reversed configuration with subsidiary coils are computed by integrating the ideal magnetohydrodynamic equilibrium equation. The mirror coils have an effect to compress the plasma appreciably in the axial direction and hence sustain the compact torus. The cusp coils enlarge the plasma and consequently make the gradient of plasma density relaxed in the radial direction.
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  • Hiroyuki Hattori
    1983 Volume 52 Issue 9 Pages 3066-3072
    Published: September 15, 1983
    Released on J-STAGE: June 01, 2007
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    Two dimensional lattice defects in KCl crystal were observed by means of optical and X-ray topographic methods. The defects produced three types of the diffraction images on X-ray topographs, that were the symmetric and asymmetric ones for ±g of reciprocal lattice vectors, and the diffuse images for any g. From the appear-disappear relation for various g and the geometrical consideration, it was concluded that the defects are stacking faults, and the fault vector is nearly a⁄6⟨211⟩ which is anti-parallel to the Burgers vector of Shockley partial dislocation in fcc structure, and that the stacking fault is accompanied with an expansion distortion perpendicular to the {111} fault plane. The defects giving asymmetric or diffuse images are concluded to be formed by the superposition of simple stacking faults.
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  • Takuyuki S. Uragami
    1983 Volume 52 Issue 9 Pages 3073-3079
    Published: September 15, 1983
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    The intensity distribution of wave field in a perfect crystal of rectangular form is calculated for a very narrow incident wave by numerically solving Takagi’s equations. The result is displayed by the graphics and interpreted in comparison with the analytic solutions of the partial differential equations. Most part of the incident wave propagates straight without being diffracted inside the crystal even when it satisfies the Bragg condition. Upon hitting a side face of rectangular crystal it is shown to be reflected back inside the crystal and to interfere with the Bragg diffraction already excited in the crystal.
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  • Seishi Yamamoto, Yasuhiro Shinnaka
    1983 Volume 52 Issue 9 Pages 3080-3084
    Published: September 15, 1983
    Released on J-STAGE: May 29, 2007
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    The phase transition in NaClO4 from the NaCl-type cubic phase (Oh5) to the orthorhombic phase (D2h17) is investigated with X-ray diffraction method. In the cubic phase, X-ray diffuse maxima are observed at the X-points of the Brillouinzone boundary. The intensity of the diffuse maximum anomalously increases with decreasing temperature toward the transition point. In the orthorhombic phase, the intensity of the super lattice reflection sharply decreases near the transition point and the lattice constant b shows anomalous expansion with increasing temperature. It is suggested that a coupling between multi-orientation of ClO4 ion and phonon plays an important role in the phase transition.
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  • Eizaburo Kanda, Akira Tamaki, Tsutomu Yamakami, Tadao Fujimura
    1983 Volume 52 Issue 9 Pages 3085-3092
    Published: September 15, 1983
    Released on J-STAGE: May 29, 2007
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    The velocity V and the attenuation α of the longitudinal ultrasonic waves have been measured accurately near the ferroelectric phase transition temperature. Critical anomalies in the paraelectric phase were represented by ΔV∼log (TT0) and \sqrtΔα∼log (TT0), where T0 was determined from the simultaneously measured dielectric constant ε=C⁄(TT0). It was also found that the energy relaxation time τE varied as τE∼(TT0)−1. This type of the critical behavior is the same as that of the usual ferroelectrics. Thus it is concluded that the dipole-dipole interaction is dominant in the critical anomaly of the ultrasonic waves of CDP. Analysis of the attenualion based on the dynamical scaling law is also presented.
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  • Shunichi Kawanishi
    1983 Volume 52 Issue 9 Pages 3093-3100
    Published: September 15, 1983
    Released on J-STAGE: May 29, 2007
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    For methyl acetate with a planar structure (Remark: Graphics omitted.) in the molecule, a spin-lattice relaxation time (T1) and a specific volume were measured in the liquid phase. Methyl acetate has a liquid-liquid phase transition at −12°C at atmospheric pressure. The liquid phase is divided into two parts named as L1 and L2 corresponding as high and low temperature liquid phase, respectively. An analysis of T1-temperature relation resulted in that there are two kinds of mode of the molecular motion. The phase transition corresponds to the change in the molecular motion and the mode whose correlation time is shorter than the other appears in each liquid phase. The L2 state is a mesomorphic state due to a planar strttcture of (Remark: Graphics omitted.) group. A pressure dependence of the transition temperature was obtained from T1 measurement at high pressure. The value of dP⁄dT at 150 MPa is about 5×106 Pa/deg.
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  • Takehiko Oguchi
    1983 Volume 52 Issue 9 Pages 3101-3109
    Published: September 15, 1983
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    The approximate theory on the Ising model with periodically distributed frustrations is proposed and applied to several two- and three-dimensional lattices. In this theory the lattice is divided into several sublattices and the molecular field at each sublattice is determined self-consistently. The tratasition temperature, thermal average of spin, and spin correlation functions between nearest neighbors are calculated and discussed.
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  • H. W. den Hartog, Ryohei Nakata
    1983 Volume 52 Issue 9 Pages 3110-3121
    Published: September 15, 1983
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    In this paper we report about the results of EPR and ionic thermocurrents (ITC) experiments on cubic solid solutions of the type Sr1−xEuxF2+x. A part of the Eu-ions is in the divalent state; these ions can be detected easily with EPR. From the EPR results we conclude that for 0≤x≤0.115 the long range order is still cubic and the lattice parameter does not vary appreciably. The interactions between distant Eu3+–Fi dipoles and the Eu2+ probes is estimated; from this we conclude that for x\gtrsim0.044 clustering of trivalent Eu-ions cannot be excluded.
    The ITC results are in line with those obtained from EPR. In addition we note that for small values of x nearest neighbor (NN) Eu3+–Fi complexes are the dominant defects. For x>5.10−3 NNN dipoles are present also. Apart from the reorientation bands associated with the abovementioned defects we observe with ITC a depolarization peak, ascribed to space charge phenomena. The behavior of the dipole peaks and the space charge peak is discussed together with the conduction processes in concentrated solid solutions Sr1−xEuxF2+x.
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  • Yuri Nakao, Shinya Wakoh
    1983 Volume 52 Issue 9 Pages 3122-3126
    Published: September 15, 1983
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    The two-dimensional electron momentum densities in Nb–Mo alloys are calculated on the basis of the average t-matrix approximation scheme. The momentum densities obtained are transformed into the reduced k-space by means of the procedure proposed by Lock et at. Our results agree qualitatively with the experimental electron-positron pair momentum densities obtained from two-dimensional angular correlation of positron annihilation radiation.
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  • Masao Takahashi, Tadao Kasuya
    1983 Volume 52 Issue 9 Pages 3127-3137
    Published: September 15, 1983
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    Properties and stability conditions for a self-trapped molecular magnetic polaron in ferromagnetic semiconductors, in which two electrons are trapped in a self-induced localized spin polarization through the strong d-f exchange interaction, are investigated theoretically in particulaly for EuO and EuS numerically. It is shown that the molecular magnetic polaron can be more stable than two single magnetic polarons near Curie temperature if the material has many valley band structures and large dielectric constant. The dependences of the free energy of the molecular polaron as well as the single polaron on the effective electron mass, the Curie temperature and d-f exchange interaction were studied. The possibility of the molecular polaron in EuO and EuS is discussed. Effect of the anisotropic effective mass was also studied by the molecular field theory and was shown that it is not important.
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  • Masao Takahashi, Tadao Kasuya
    1983 Volume 52 Issue 9 Pages 3138-3143
    Published: September 15, 1983
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    The effect of the electron-LO phonon interaction on the magnetic polaron in EuS and EuO is studied by the trial Hamiltonian method theoretically. It is shown that this effect stablizes the magnetic polaron more by shrinking its radius. The stability regions of both the single and the molecular magnetic polarons become wider. However, the relative stabilty of the molecular polaron to the decomposed two single polarons does not change so much.
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  • Yutaka Inaba
    1983 Volume 52 Issue 9 Pages 3144-3153
    Published: September 15, 1983
    Released on J-STAGE: June 01, 2007
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    Diffusion of a particle or an excitation in randomly fluctuating media is studied theoretically. The model is a tight-binding Hamiltonian whose diagonal or off-diagonal elements are modulated by mutually-independent random noises. The non-white modulation models are investigated precisely. The diffusion constant (D) depends on the noise-parameters such as the amplitude (Δ) and the correlation time (γ−1) and also depends on the static band width (W). Explicit calculation of D has been performed by using the dynamical coherent potential approximation and by computer experiments. In the case that diagonal elements are modulated by discrete-jump noises, D as a function of γ has a minimum in the vicinity of hγ=Δ if Δ>>W. On the contrary, D(γ) is a monotonically-increasing function of γ if Δ<<W. In the off-diagonal fluctuation case, the diffusion constant exhibits a feature qualitatively different from the diagonal fluctuation model.
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  • Teruya Shinjo, Nobuyoshi Hosoito, Kenji Kawaguchi, Toshio Takada, Yasu ...
    1983 Volume 52 Issue 9 Pages 3154-3162
    Published: September 15, 1983
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    Multilayered films with artificial superstructure, consisting of Fe and Sb layers were prepared by UHV deposition technique. Individual Fe and Sb layers were varied from 2 to 42 Å and from 8 to 41 Å, respectively. 57Fe and 121Sb Mössbauer spectroscopy, neutron diffraction and ferromagnetic resonance experiments were applied to these films and the magnetic properties of Fe interface in contact with Sb are discussed.
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  • Tetsuya Sato, Eiji Ohta, Makoto Sakata
    1983 Volume 52 Issue 9 Pages 3163-3169
    Published: September 15, 1983
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    The magnetic susceptibility χ and the electrical resistivity ρ of Cr1−xFexGe (0≤x≤0.9) are measured in the temperature ranges of 4.2–420 K and 4.2–300 K, respectively. The magnetic susceptibility shows the Curie-Weiss-like behavior in a composition region close to a critical composition for the onset of ferromagnetism (x=0.75). At high temperatures, the electrical resistivity shows a temperature dependence which is convex to temperature axis and finally tends to saturation for all the samples investigated. For small x, tire electrical resistivity is proportional to T2 at low temperatures. These behaviors of χ and ρ for x>0 are explained on the basis of the spin fluctuation theory for weakly and nearly ferromagnetic metals. We conclude that the degree of the electron correlation increases systematically with increasing x.
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  • Toshiaki Saito, C. J. Sandberg, Yoshihito Miyako
    1983 Volume 52 Issue 9 Pages 3170-3179
    Published: September 15, 1983
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    The real, Re χ0(ω, H), and the imaginary, Im χ0(ω, H), components of acsusceptibility were measured on (Ti0.9V0.1)2O3 and (Ti0.98V0.02)2O3 crystals in the static magnetic field H as well as in zero field. The experimental results were analized using a modified Debye model which is applicable to the magnetic system with multi-relaxation times and it was found that spin glass freezing is characterized by a noticeable change in the distribution of relaxation times. The spin glass freezing temperature Tg(H) is determined from the inflection point of Im χ0(ω, H) and is given as a function of H. From H vs Tg(H) curve, the (Almeida-Thouless) critical line Hc(T) is obtained as Hc(T)∼ε1.6±0.00.1, where ε=(Tg(H)−Tg(0))⁄Tg(0).
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  • Keiko Matsubara, Kiyoshi Kawamura, Takuro Tsuzuku
    1983 Volume 52 Issue 9 Pages 3180-3187
    Published: September 15, 1983
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    Diamagnetism study on graphite-acceptor compounds has been further extended over dilute nitrates and slightly neutron-irradiated graphite. An analysis was made on the basis of Sharma-Johnson-McClure’s theory taking into account the trigonal warping of the Fermi surface. The susceptibility vs reciprocal termperature plots, including those for ICl compounds not completely interpreted in the previous study, have been theoretically reproduced by assuming a mixed phase structure of orderly intercalated and purely graphitic domains in each sample. The hole production rate (ionization efficiency) of acceptors was evaluated by using Ono-Sugihara’s formulae which take into account the trigonal warping effect on the carrier density. It has been found that 5% of intercalated ICl is ionized in the doped regions irrespectively of the total content.
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  • Masaru Wada, Kazuyoshi Takeda, Akihito Ohtani, Akifumi Onodera, Taiich ...
    1983 Volume 52 Issue 9 Pages 3188-3198
    Published: September 15, 1983
    Released on J-STAGE: June 01, 2007
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    The hydrostatic pressure dependence of the Néel temperature, magnetic phase diagram and crystal structure of the antiferromagnetic CoCl2·6H2O (TN=2.29 K) have been studied by measurements of magnetic heat capacity, susceptibility and X-ray analysis. The anisotropy field HA(p) and the exchange constant J(p) in the two-dimensional a-b plane have been found to depend linearly on pressure p as HA(p)=HA(p0) (1+0.24p) and J(p)=J(p0) (1+0.031p) in the range p0(∼0.001 kbar)<p<6 kbar. The Néel temperature TN(p) has been also revealed to depend linearly on p and to be reversible in the process of (Remark: Graphics omitted.). The appearance of rounding of heat capacity peak at TN(p), however, has been found irreversible in the process of compression in the critical temperature region ε(=|TTN|⁄TN)<2×10−2. The effect of variation of magnetic dimensionality on phase transition has been discussed considering these magnetic data and pressure dependence of atomic or ionic distances in the crystal.
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  • Naoshi Suzuki
    1983 Volume 52 Issue 9 Pages 3199-3207
    Published: September 15, 1983
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    Effects of the dipole-dipole (DD) interaction on the phase transition in RbFeCl3-type hexagonal antiferromagnets are studied microscopically. The magnetic phase diagram of two typical cases is determined by the molecular-field approximation (MFA): CsNiF3 (DD coupling\gtrsiminterchain exchange coupling) and RbFeCl3 (DD coupling<<interchain exchange coupling). We show that incommensurate (IC) phases are common in these systems. Even in CsNiF3, where no IC phase appears in weak fields, an IC fan structure can appear in the high field region if the magnetic field is applied along a suitable direction. As an attempt to improve the MFA the magnetic phase diagram of RbFeCl3 is determined by making use of the inverse susceptibility tensor calculated by the dynamical correlated-effective-field approximation (DCEFA).
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  • Ikuo Tamura, Takahito Kaneyoshi
    1983 Volume 52 Issue 9 Pages 3208-3214
    Published: September 15, 1983
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    Surface magnetism and phase diagram in amorphous semi-infinite ferromagnets are studied on the basis of the lattice model of amorphous magnets. We find that the surface ordering is expected in amorphous ferromagnets more than in its crystalline ones.
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  • L. V. Gonzaga, J. F. Sampaio, G. M. Ribeiro, R. Gazzinelli, A. S. Chav ...
    1983 Volume 52 Issue 9 Pages 3215-3218
    Published: September 15, 1983
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    The different kinds of charge compensation for Tl2+ are observed in the paraelectric phase of heavily doped KH2PO4 and KD2PO4. The EPR spectra of two of these paramagnetic centers, not yet reported in the literature, are studied and possible models for the charge compensation are proposed.
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  • Masaki Maeda, Atsuto Honda, Noboru Yamada
    1983 Volume 52 Issue 9 Pages 3219-3224
    Published: September 15, 1983
    Released on J-STAGE: June 01, 2007
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    X-ray and dielectric measurements were made on Cs2CdBr4 (CCB) crystals, and optical observation was also made. CCB undergoes successive phase transitions at T1=−21°C, T2=−36°C and T3=−65°C. The space groups in all phases have been determined: I: Pnam, II: P1ssPnam, III: P21/n and IV: P\bar1. The space group for the incommensurate II-phase is determined on the basis of four-dimensional space group concept. Temperature dependence of the position and the intensity of satellite reflections in the incommensurate phase was measured. Rotation of optical indicatrix was found in III- and IV-phases and its temperature dependence was measured. Ferroelastic activities in III- and IV-phases were found.
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  • Hirotoshi Souma
    1983 Volume 52 Issue 9 Pages 3225-3232
    Published: September 15, 1983
    Released on J-STAGE: June 01, 2007
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    We explain the utility of third-order nonlinear susceptibility, χ(3)2; ±ω1, \mpω1, ω2), for the observation of resonances with homogeneous widths from inhomogeneously broadened distributions in three-level systems related to Raman or two-photon allowed electronic transitions. The line narrowing and high resolution capabilities are demonstrated theoretically using a model for inhomogeneous distributions of transitions in which we regard an absorption spectrum as the composition of some inhomogeneously broadened substructures. The experimental methods to separate a signal having frequency ω2 from ingoing beam at the same frequency are outlined.
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  • Hitoshi Nishimura
    1983 Volume 52 Issue 9 Pages 3233-3243
    Published: September 15, 1983
    Released on J-STAGE: May 29, 2007
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    In the 2s exciton absorption region, remarkable oscillation structures with the energy interval of the LO phonon have been observed on the luminescence excitation spectra. The oscillation structures for 1s free exciton luminescence, Ex luminescence and impurity luminescence are in phase with one another, and the structures for σ luminescence and π luminescence are also in phase with each other. The structure for the former group is, however, out of phase with the structure for the latter group. These two series of the oscillation structures are discussed by introducing several relaxation processes of 2s hot excitons, such as cascade relaxation, self-trapping and interband scattering, and the rates of the processes are estimated.
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  • A. Nath
    1983 Volume 52 Issue 9 Pages 3244-3247
    Published: September 15, 1983
    Released on J-STAGE: May 29, 2007
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    The crystal field energy levels, the magnetic susceptibilities and the g-values of Pr2Mg3(NO3)12·24H2O were calculated theoretically by means of diagonalisation of the matrix of spin-orbit (SO), electrostatic (ES) and the crystal field (CF) interaction considered together, the matrix being constructed in a basis of all states of Pr3+ in the 4f2 configuration. A C3v site has been assumed. The crystal field levels that were obtained from the aforesaid diagonalisation were used to calculate the g-values and principal magnetic susceptibilities. The set of parameters giving the good fit to the three experiments (optical, EPR and susceptibility), has been evaluated.
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  • Ryumyo Onaka, Hiromi Iwamoto
    1983 Volume 52 Issue 9 Pages 3248-3253
    Published: September 15, 1983
    Released on J-STAGE: June 01, 2007
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    The exciton absorption bands in RbI and KI are studied by means of magnetic circular dichroism spectra, and their effective g-values are obtained. From the sign of the geff-values, it is concluded that the lowest two sharp absorption bands, E1 and E2, are (Γ8; Γ6+) and (Γ6; Γ6+) excitons, respectively, which are split by the spin-orbit interaction of iodine 5p electrons. The higher energy bands, E3 and E4, are probably the exciton bands produced by excitation of halogen 5p electrons to the d-like conduction bands at X and L points in the Brillouin zone.
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  • Koichi Toyoda, Kaizo Nakamura, Yoshio Nakai
    1983 Volume 52 Issue 9 Pages 3254-3259
    Published: September 15, 1983
    Released on J-STAGE: May 29, 2007
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    Excitation spectra of luminescence due to Na ions in KBr: Na crystals have been investigated in detail at LHeT by varying the Na content. Quantum efficiency of the luminescence shows the characteristic change according as the exciting energy is above or below the peak energy of the first exciton band (Eh- or E1-excitation). Two different processes are suggested for the relaxation of the free exciton. Excitons created by E1-excitation have much longer lifetime than those created by Eh-excitation. The diffusion length of the exciton produced under E1-excitation is estimated to be nearly 17 lattice distance (110 A), while the diffusion length of exciton produced under Eh-excitation is very small.
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  • Kenichi Mizuno, Atsuo Matsui
    1983 Volume 52 Issue 9 Pages 3260-3264
    Published: September 15, 1983
    Released on J-STAGE: May 29, 2007
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    Absorption and luminescence spectra in pyrene have been investigated. Absorption spectra below the phase transition point at 120 K exhibit structures which are not observed in the room temperature spectra. Below the phase transition temperature another dimeric phase (α′) which differs from that in the room temperature phase (α) is suggested to appear. This suggestion is consistent with information reported from the electron diffraction patterns. The relationship between the specimen cooling method and the occurrence of the phase transition is briefly discussed.
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  • Eiichi Hanamura
    1983 Volume 52 Issue 9 Pages 3265-3274
    Published: September 15, 1983
    Released on J-STAGE: June 01, 2007
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    The effect of frequency modulation on optical phenomena is reduced critically when the Rabi frequency increases beyond the inverse correlation time or the amplitude of the frequency modulation. This is observed in the time region as the change of the free induction decay rate from the Bloch type into the Redfield one. That is shown in this paper to be observable also in the frequency region as the narrowing of the central line and the side bands split-off by the Rabi frequency above and below it in the emission spectrum beyond the Rabi frequency equal to the inverse correlation time.
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  • Tomoyuki Matsuura, Takashi Fujikawa, Haruo Kuroda
    1983 Volume 52 Issue 9 Pages 3275-3282
    Published: September 15, 1983
    Released on J-STAGE: June 01, 2007
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    We theoretically investigate the possibility to obtain the information about the hydrogen adsorption on metals by the XANES spectroscopy. The theoretical method used in this study was proposed by the present authors. Three metals are chosen for the substrates; Ni, W and Pt. The calculated results show that the XANES spectroscopy is useful only for H on W system. In other two systems observable changes caused by hydrogen adsorption are not observed in the XANES spectra.
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  • Tosiyuki Noguti, Nobuhiro G\={o}
    1983 Volume 52 Issue 9 Pages 3283-3288
    Published: September 15, 1983
    Released on J-STAGE: May 29, 2007
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    Problems are discussed that are associated with extension of the time-independent method of conformational energy analysis of biopolymers, in which only dihedral angles are treated as independent variables, to time dependent one. For molecules with small amplitudes of fluctuations internal motions of atoms due to variations of dihedral angles are shown to be defined with respect to a coordinate system which is defined by the Eckart’s condition and is moving with the molecule. Computationally efficient and explicit expressions are given (i) for a coefficient matrix to convert small changes in dihedral angles to small atomic displacements from the mean positions, and (ii) for a coefficient matrix in the expression of the kinetic energy of internal motions in terms of first order time derivatives of variable dihedral angles.
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  • Isao Minagawa
    1983 Volume 52 Issue 9 Pages 3289
    Published: September 15, 1983
    Released on J-STAGE: May 29, 2007
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