Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
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Volume 51, Issue 11
Displaying 1-50 of 51 articles from this issue
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  • Magnetic Resonance in an Amorphous Slag: 8CaO·8SiO2·3Fe2O3·2FeO
    Kazukiyo Nagata, Yoshiaki Saito, Kazuhiro Nagata
    1982Volume 51Issue 11 Pages 3407-3408
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3407
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    Magnetic resonance study has been performed on an amorphous insulating system 8CaO·8SiO2·3Fe2O3·2FeO. At room temperature a well exchange-narrowed line with g∼2 has been observed, which broadens and shifts towards lower fields with decreasing temperature. Both the linewidth and the lineshift show sharp changes of the slope of the temperature variations at about 65 K. Below this temperature the linewidth is nearly temperature-independent but the resonance position varies in rather complicated manner. The shift of the resonance in the paramagnetic phase is interpreted as an exchange shift resulting from the rapid damping of Fe2+ spins.
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  • Ferroelectricity and Successive Phase Transitions in (NH4)2ZnBr4
    Toshio Osaka, Masaru Komukae, Yasuharu Makita
    1982Volume 51Issue 11 Pages 3409-3410
    Published: November 15, 1982
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3409
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    Dielectric and thermal properties of (NH4)2ZnBr4 were studied. It was found that (NH4)2ZnBr4 undergoes phase transitions at about −56.5°C and 166°C on warming. The crystal becomes ferroelectric below the lower transition temperature where a small stepwise anomaly in the dielectric constant along the a axis is observed. Spontaneous polarization obtained is 0.22 μCoul/cm2 at −140°C.
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  • Evidence for Weak-Ferroelectricity of (NH4)2ZnCl4 in the Phase between Ferro- and Antiferro-Electric Phases
    Toshiaki Sato, Manabu Endo, Toshio Osaka, Yasuharu Makita
    1982Volume 51Issue 11 Pages 3411-3412
    Published: November 15, 1982
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3411
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    The dielectric properties of (NH4)2ZnCl4 near the ferroelectric transition temperature were studied. The dielectric constant along the a axis shows a step-wise anomaly at −4.5°C and kinks at 3°C and 46°C. It was found that (NH4)2 ZnCl4 in a narrow temperature range from −4.5°C to 3°C, that is, between ferroelectric and antiferroelectric phases is weak-ferroelectric. Spontaneous polarization is 0.005 μC/cm2 at about −3°C in comparison with 0.36 μC/cm2 at about −120°C in the ferroelectric phase.
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  • On Classical Boussinesq Equation
    E. V. Krishnan
    1982Volume 51Issue 11 Pages 3413-3414
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3413
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    The Classical Boussinesq equation has been taken into consideration for calculating the periodic wave solutions in terms of Jacobian cosine elliptic functions. A relation between the translation speed of the periodic wave and the maximum height of pulse is established. The linear and the solitary wave limits have also been discussed.
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  • A Statistical Mechanical Model for Two Dimensional Turbulence
    Akio Fukuyu
    1982Volume 51Issue 11 Pages 3415-3416
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3415
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    A statistical mechanical model for two dimensional homogeneous isotropic turbulence is proposed. This model is based on a hypothesis that the extremely high Reynolds number two dimensional turbulence is, at each instant, in a state of equal probability on the intersections of energy and palinstrophy planes in the phase space. An energy spectrum is obtained which shows the k−3 dependence for large wave numbers and represents the energy equipartition state for small wave numbers.
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  • An Integrable Classical Spin Chain
    Yuji Ishimori
    1982Volume 51Issue 11 Pages 3417-3418
    Published: November 15, 1982
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3417
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    An integrable spin model on the one-dimensional lattice is obtained from the differential-difference nonlinear Schrödinger equation by introducing the concept of gauge equivalence. The Hamiltonian for this spin model is expressed as
    (Remark: Graphics omitted.)
    where the spins Sn are classical three-dimensional unit vectors.
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  • Band Mixing in 160Dy
    M. L. Hasiza, K. Singh, H. S. Sahota
    1982Volume 51Issue 11 Pages 3419-3422
    Published: November 15, 1982
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3419
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    The intensities of the gamma transitions in 160Dy have been measured precisely by a 45 cc Ge(Li) detector. Unequal quadrupole moments for the ground and gamma vibrational bands have been proposed in order to remove the inconsistencies in the values of band mixing parameter Zγ for this doubly even deformed nucleus of 160Dy.
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  • Chaotic State in an Electronic Circuit: Analysis of Gollub et al.’s Experiment
    Tomoji Yamada
    1982Volume 51Issue 11 Pages 3423-3430
    Published: November 15, 1982
    Released on J-STAGE: August 23, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3423
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    The experimental results of Gollub et al. are analysed by taking into account the real current-voltage characteristics of tunnel diode. The characteristics is approximated by a piecewise linear function. Then, we get a satisfactory agreement with the experimental results. The system is equivalent to the coupled two limit-cycle oscillators. For an appropriate coupling strength and frequency ratio a chaotic state arises. The return maps and the power spectra are given to ascertain the existence of the chaos. For a set of parameters deduced from the experiment the phase diagram is shown.
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  • Ground State of a Wigner Crystal in a Magnetic Field I. Cubic Structure
    Tatsuzo Nagai, Hidetoshi Fukuyama
    1982Volume 51Issue 11 Pages 3431-3442
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3431
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    The ground-state energies in magnetic fields are calculated for the electron crystals with the bcc and fcc structures at low electronic densities. The energies are obtained as sums of the static energy and the zero-point vibration energy in the harmonic approximation. The zero-point energy of the fcc becomes lower than that of the bcc above a critical strength of magnetic field. This leads to a structural phase transition from the bcc to the fcc caused by magnetic field. The phase diagram is determined in the density-field plane.
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  • Light Scattering from a Fluid in the Stationary State Caused by a Temperature Gradient
    Hiroshi Ueyama
    1982Volume 51Issue 11 Pages 3443-3448
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3443
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    A generalization of the theory of fluctuations in fluids of Landau and Lifshitz is presented on the basis of the stochastic Boltzmann equation and it is applied to the light scattering from a fluid in a nonequilibrium stationary state. The density correlation function is calculated, which agrees qualitatively with that of the nonlinear theory of kinetic equation approach of Kirkpatrick and Cohen.
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  • Statistical Mechanics of Biomembrane Phase Transition. III—Basic Concept of Cell Membrane Phase Transition—
    Takeo Izuyama
    1982Volume 51Issue 11 Pages 3449-3461
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3449
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    Statistical mechanical study on the biomembrane phase transition is extended to the cell membrane, which consists of various kinds of lipids and embraces substantial amount of proteins. The modified dimer model used in our previous study is adopted. The activation energies for excited dimers are taken to be distributed “randomly” on the dimer lattice. The proteins are represented by hard blocks which inhibit any excited dimer to invade the lattice sites occupied by the proteins. This model of statistical mechanics exhibits a well-defined phase transition. The free energy, specific heat, etc., have essential singularities at the transition point.
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  • A Theory of Ferromagnetic Superconductors —An Analysis of Experiments on ErRh4B4 and HoMo6S8—
    Kazushige Machida
    1982Volume 51Issue 11 Pages 3462-3468
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3462
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    The coexistence problem of ferromagnetism and superconductivity is discussed theoretically. Recent experiments on the rare earth ternary compounds ErRh4B4 and HoMo6S8 are analyzed on the basis of the sf exchange interaction model. It is shown that the ferromagnetic molecular field effect of the sf exchange interaction is crucial in explaining the data and the spatially inhomogenous superconducting state coexisting with ferromagnetism can describe adequately various aspects of the sinusoidally modulate magnetic structure observed in both compounds.
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  • Surface Magnetization in Ferromagnetic Superconductors
    Tomio Koyama, Akio Kotani, Saburo Takahashi, Masashi Tachiki, Hideki M ...
    1982Volume 51Issue 11 Pages 3469-3474
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3469
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    A magnetic structure near the surface of ferromagnetic superconductors is theoretically studied in the temperature range of the coexistence of superconductivity and magnetism. The screening effect of the exchange interaction due to the persistent current is weakened near the surface and a spontaneous magnetization bound near the surface appears at a temperature slightly higher than the phase transition temperature of the bulk periodic phase, Tp. Below Tp, the periodic magnetic structure is modified near the surface so as that the ferromagnetic character is emphasized.
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  • I=∞ Hubbard Model on Finite Lattices
    Minoru Takahashi
    1982Volume 51Issue 11 Pages 3475-3487
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3475
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    Ferromagnetism of the single band Hubbard model at I=∞ is analyzed numerically. The lowest energies at given electron number and total spin are calculated for various finite lattices, such as 3×4 square lattice, 2×2×3 simple cubic lattice and triangular lattices. It is found that the three-site exchange is important for the strong ferromagnetism.
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  • Incommensurate Magnetic Structures in Triangular Antiferromagnets Caused by the Dipole-Dipole Interaction: a Realization of Conical-Point Instability
    Hiroyuki Shiba, Naoshi Suzuki
    1982Volume 51Issue 11 Pages 3488-3496
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3488
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    The dipole-dipole interaction is important in the phase transitions of RbFeCl3-type XY-like antiferromagnets. It can realize incommensurate states, which are related to the conical-point instability first pointed out by Ishibashi and Dvorak in connection with the structural phase transition. Several consequences of the conical-point instability including the in-plane-field effect are studied by using the Landau-type free energy. A recent neutron scattering on RbFeCl3 by Wada, Ubukoshi and Hirakawa is discussed from the viewpoint of the conical-point instability caused by the dipole-dipole interaction.
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  • Pressure Effects on Spin Density Wave in Cr Rich Cr–Al, Si, Mn, Fe and Co Alloys
    Jun’ichiro Mizuki, Yasuo Endoh, Yoshikazu Ishikawa
    1982Volume 51Issue 11 Pages 3497-3503
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3497
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    The effect of pressure on the spin density wave (SDW) state in Cr rich Cr–Al, Si, Mn, Fe and Co alloys has been elucidated by neutron diffraction studies. We found that the change of the SDW wave vector Q, by applying pressure, 1⁄Q·ΔQ⁄ΔP, is linearly related to the decrease of TN with increasing pressure 1⁄TN·ΔTN⁄ΔP and that all the results from the Cr–Si, Fe and Co alloys fall on a single straight line independent of their concentrations. Their magnetic phase diagrams in a temperature-pressure coordinate system can be related to the alloy phase diagram by employing an empirical rule that applying pressure corresponds to a decrease in the electron to atom ratio. The non transition metal Si impurity has been found to act as an electron donor, while the effect of Al is not interpreted by the two band nesting model.
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  • The 1st Magnetocrystalline Anisotropy Constant K1 and the Pressure Effect on it ∂K1⁄∂p for Ni–Rh and –V
    Kazuo Oishi, Akinari Kasai, Hiroshi Fujiwara
    1982Volume 51Issue 11 Pages 3504-3507
    Published: November 15, 1982
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3504
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    The 1st magnetocrystalline anisotropy constant K1 was determined from the torque curve of the (001) plane for Ni–Rh and –V. Measurements were carried out at normal pressure and under pressures up to 7 kbar. Measurement temperature ranged from 4.2 K to room temperature at normal pressure and pressure effect was measured only at 77 K. The results for Ni–Rh is successfully explained by the band model in which we assume the linear change in spin-orbit parameter and the monotonical change in exchange splitting with salute content. However, those for Ni–V cannot be explained with the model. This is considered due to the appearance of the virtual bound states.
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  • Pressure Dependence of Spin Density Wave in Cr-0.5 at.%Ge
    Jun’ichiro Mizuki, Yasuo Endoh
    1982Volume 51Issue 11 Pages 3508-3511
    Published: November 15, 1982
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3508
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    The magnetic structures of a single crystal of Cr-0.5 at.%Ge as a function of pressure have been studied by neutron diffraction. The characteristics are quite different from those of Cr-1.4 at.%Si. Instead the magnetic phase diagram as a function of pressure resembles that of CrMn.
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  • Anisotropic Compressibilities of the Linear-Chain Compound TaSe3
    Kazuhiko Yamaya, Gendo Oomi
    1982Volume 51Issue 11 Pages 3512-3515
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3512
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    The compressibilities of the linear-chain compound TaSe3 was found to be anisotropic, that is, the compressibility of the b-axis (chain axis) was very small compared with those of the a- and c-axis. It was found also that the compressibilities within the (a, c)-plane were anisotropic. From the anisotropic compressibilities, it is concluded that TaSe3 should be considered as a two-dimensional material with large anisotropy within the layers.
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  • Band Gap of Disordered Binary Alloys with Off-Diagonal Disorder —Repulsive Effect between Bands—
    Kozo Hoshino, Masaki Goda
    1982Volume 51Issue 11 Pages 3516-3520
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3516
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    The band gap of disordered binary alloys due to off-diagonal disorder is investigated quantitatively in the tight-binding model. The numerical results based on the Blackman et al. theory show that the shape of the density of states as well as the band edges are strongly affected by the repulsive effect between bands caused by the inter-band interaction. It is also shown that the effect is prominent even when the bands of component pure metals overlap.
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  • Pressure Effects on the Spontaneous Magnetization of Ni–V Single Crystals
    Kazuo Oishi, Akinari Kasai, Hiroshi Fujiwara
    1982Volume 51Issue 11 Pages 3521-3525
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3521
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    Pressure effects on the spontaneous magnetization at 0 K were estimated from the forced magnetostriction. The results were analysed on the basis of the itinerant electron model, which takes both d band widening and s-d transfer into account. The pressure effect dμ⁄dp is anisotropic through the direction of the magnetization. For pure Ni, dμ⁄dp results only from the s-d transfer. For the positive dμ⁄dp of Ni–V alloy, an explanation was made with the virtual bound levels.
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  • Dynamical Theory for Multiphonon Nonradiative Transitions—The Landau-Zener Formula
    Yosuke Kayanuma
    1982Volume 51Issue 11 Pages 3526-3534
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3526
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    The hot nonradiative transitions in strongly coupled electron-phonon system is studied by a three level, constant transfer model under white pulse excitation condition. It is shown, both analytically and numerically, that the transition rate as the phonon wave packet passes through the crossing point of the adiabatic potential energy curves is given by the Landau-Zener formula in the limit of strong electron-phonon coupling except the case that the crossing point coincides with the stationary point of the motion of the wave packet.
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  • Interband Correlation of Potential Fluctuations and the Photostructural Change in Glassy Semiconductors
    Shuji Abe
    1982Volume 51Issue 11 Pages 3535-3543
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3535
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    The photostructural change in chalcogenide glasses can be understood as a change in the interband correlation of spatial potential fluctuations. A model of reaction processes for this change is proposed, including the capture and recombination of photogenerated electron-hole pairs and the transformation of potential fluctuations. By assuming appropriate forms for the reaction rates, the following results are obtained. In the stationary condition under light illumination the degree of negative interband correlation increases with increasing light intensity and decreases with increasing temperature, while in thermal equilibrium (on annealing) in the dark it increases with increasing temperature. These features are consistent with recent experiments.
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  • Self-Consistent Treatment of Dynamical Diffusion Coefficient of Two Dimensional Random Electron System under Strong Magnetic Fields
    Yoshiyuki Ono
    1982Volume 51Issue 11 Pages 3544-3552
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3544
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    Diagramatic treatment for the density relaxation function is employed to determine the renormalized dynamical diffusion coefficient D(ω) of two dimensional random electron system under quantizing magnetic fields; for simplicity, the case where the Fermi energy lies within the lowest Landau subband is considered. The resulting self-consistent equation shows that D(0) does not vanish only when the real part of the retarded Green’s function at the Fermi level is zero. The quantities, such as ReD(ω), ImD(ω) and the localization length, are calculated numerically by changing the Fermi energy within the lowest subband. The measure of the number of extended states per unit area is zero, but extended states do exist, which does not contradict with the observation of the quantized Hall effect.
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  • Dispersion Relations and Reflection Spectra of L–T Mixed Mode Polaritons
    Kensei Ehara, Kikuo Cho
    1982Volume 51Issue 11 Pages 3553-3561
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3553
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    Dispersion relations of L–T (longitudinal-transverse) mixed mode polaritons are calculated for the Eu mode phonons in calcite and the 1s A and B excitons in β-AgI. The calculations are based on a recently developed formalism that is well-suited for L–T mixed modes as well as for multi-component polaritons. From the line-shape analysis of the reflection spectra, values of the relevant parameters are determined. The role of the background dielectric tensor in the dispersion equation of L–T mixed mode polaritons is also discussed within a general theoretical framework.
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  • Brillouin Scattering Study of NaNO2 in the Vicinity of Its Phase Transition Temperatures
    Toshirou Yagi, Yoshikazu Hidaka, Kiyoshi Miura
    1982Volume 51Issue 11 Pages 3562-3568
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3562
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    The ultrasonic dispersion in the incommensurate (antiferroelectric) phase of NaNO2 has been examined by a Brillouin scattering experiment with a special emphasis on the temperature regulation near its phase transition temperatures. A slight anomaly of the frequency shift (Δν) of the longitudinal mode was observed only in the [010] direction at the normal-incommensurate transition point TN. The temperature dependence of Δν in the incommensurate phase is normal in all the three principal directions [100], [010] and [001] in contrast to the ultrasonic results. An apparent dispersion in sound velocity was found in the [010] direction by comparing with the ultrasonic data. It is confirmed that the dispersion frequency lies below a hypersonic region. The anisotropy suggests a spatial character of the orientational fluctuation on NO2 molecules in the incommensurate phase.
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  • Effects of Deuteration on the Dielectric Properties of Ferroelectric CsH2PO4. I. Static Dielectric Properties
    Kiyoshi Deguchi, Etsuo Okaue, Eiji Nakamura
    1982Volume 51Issue 11 Pages 3569-3574
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3569
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    The dielectric constant along the ferroelectric b-axis and the spontaneous polarization have been measured for CsH2(1−x)D2xPO4 (x=0∼0.98) over wide temperature ranges. The temperature dependences of the dielectric constant in the paraelectric phase are well described on the basis of the quasi-one-dimensional Ising model except in the vicinity of the Curie temperatures, 0 K≤T−Tc\lesssim20 K, for all the specimens with different amounts of x. The saturated value of the spontaneous polarization increases with increasing x. The observed results are discussed in terms of the quasi-one-dimensional model.
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  • Effects of Deuteration on the Dielectric Properties of Ferroelectric CsH2PO4. II. Dynamic Dielectric Properties
    Kiyoshi Deguchi, Eiji Nakamura, Etsuo Okaue, Noriari Aramaki
    1982Volume 51Issue 11 Pages 3575-3582
    Published: November 15, 1982
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    DOIhttps://doi.org/10.1143/JPSJ.51.3575
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    The complex dielectric constants along the ferroelectric b-axis have been measured for CsH2PO4 and a series of partially deuterated CsH2(1−x)D2xPO4 crystals in the frequency range from 1 MHz to 1 GHz. Dielectric dispersions of partially deuterated crystals as well as undeuterated one were found to be very close to the monodispersive Debye type. The relaxation times of the partially deuterated crystals at temperatures with the same distance from Tc increase monotonically as the deuteron concentration increases, and reach the values of about 5 times as large as those of CsH2PO4. Contrary to the basic assumption in the Landau-Khalatnikov theory, the ratio of the relaxation time to the static dielectric constant increases as temperature approaches Tc.
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  • Crystal Structure Determination of Antiferroelectric PbZrO3 —Application of Profile Analysis Method to Powder Method of X-ray and Neutron Diffraction—
    Hideshi Fujishita, Yoichi Shiozaki, Norio Achiwa, Etsuro Sawaguchi
    1982Volume 51Issue 11 Pages 3583-3591
    Published: November 15, 1982
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3583
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    Crystal structure of antiferroelectric PbZrO3 has been studied at room temperature by adopting X-ray and neutron profile analysis methods. A considerable refinement of the structure has been made on a previous model which has generally been accepted in these 20 years. In contrast to the old model which has a large spontaneous polarization, present model has no polarization at all, and the interatomic distances are reasonable magnitude. Several contradictions having been noticed between the dielectric properties and the structural nature are now completely resolved.
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  • Physical Properties of a Quasi One-Dimensional Conductor Pt6(NH3)10Cl10(HSO4)4: Partially Oxidized Salt of the Magnus Green Salt
    Ryozo Inoue, Toshiaki Enoki, Ikuji Tsujikawa
    1982Volume 51Issue 11 Pages 3592-3600
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3592
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    The salt Pt6(NH3)10Cl10(HSO4)4 with the average valence of Pt 2.33 was prepared by means of partial oxidation of [Pt(NH3)4]-[PtCl4]. The electrical conductivity σ has a maximum at about 230 K and a minimum at about 280 K which indicate two M-I transitions. The thermal analyses by a DSC show three anomalies only on heating, G at ∼150 K, A at ∼200 K and B at ∼250 K. The exothermic anomaly A succeeding to the weak anomaly G indicates that a glass transition takes place, which is supported by a.c. calorimetry. The endothermic anomaly B corresponds to a structural transition. The result by adiabatic calorimetry at low temperature is expressed as C(T)=δT+βT3. The β value leads to the Debye temperature of 188 K and the presence of the T-linear term also supports the glassy state. The results of X-ray powder patterns at low temperatures are given. The M–I transitions are discussed.
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  • Transverse Magnetoresistance and Shubnikov-de Haas Effect in Intermetallic Compounds InBi and In2Bi
    Kunihiko Maezawa, Yoshitami Saito, Toshio Mizushima, Shigeru Wakabayas ...
    1982Volume 51Issue 11 Pages 3601-3606
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3601
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    The transverse magnetoresistance of intermetallic compounds InBi and In2Bi have been studied at 4.2 K in magnetic fields up to 100 kOe. Shubnikov-de Haas oscillations of InBi were observed for the fields over 60 kOe. The results indicate that InBi is a compensated metal with all closed orbits. These are compared with a Fermi surface model proposed already by Schirber et al.
    In2Bi is an uncompensated metal with an open orbit along the ⟨10\bar10⟩ direction. The present results are compared with the nearly free electron model which contains a multiply connected Fermi surface.
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  • Surface Anisotropy Effects in Ising Ferromagnets
    Ikuo Tamura
    1982Volume 51Issue 11 Pages 3607-3614
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3607
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    Surface anisotropy effects in semi-infinite Ising ferromagnets with spin one are investigated in term of a newly developed effective field theory. It is found that the surface can not magnetize above the ordering temperature for the bulk, no matter what the value of the surface anisotropy is. This is in sharp contrast with the result of an usual molecular-field theory, which gives a surface spontaneous magnetization there if the surface anisotropy is sufficiently larger than the anisotropy in the bulk. Temperature dependences of the magnetization and the average of the square of the single-site magnetization are also calculated numerically for some typical cases.
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  • Magnetic Nature of the Relaxed Excited State of F Centers and Spin Flipping Processes in the Optical Pumping Cycle
    Hiroshi Ohkura, Katsushi Tara, Norio Akiyama, Kiyokazu Iwahana, Yuzo M ...
    1982Volume 51Issue 11 Pages 3615-3622
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3615
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    The magnetic nature of the relaxed excited state (RES) of F centers and spin-flipping processes in the optical pumping cycle have been clarified by studying the magnetic circular polarization (MCP) of emission when the pumping light is modulated between right and left circular polarization at the frequency of (ω⁄2π). Paramagnetic component Δp(ω) of MCP is found to be proportional to the spin polarization P*(ω) in the RES with a proportionality constant Fp. From the analysis of the dependence of Δp(ω) at particular frequencies on the pumping photon energy Eph, Fp is estimated. Thus, the Eph-dependence of the net spin-mixing parameter εt is determined. The values of Fp and εt are found to be smaller than those determined previously. The source of discrepancy is discussed. It is suggested that the spin-mixing in the non-radiative transition process is not neglected.
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  • The Effect of Nonresonant RF Photons on NQR in NaClO3
    Taro Ito
    1982Volume 51Issue 11 Pages 3623-3632
    Published: November 15, 1982
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3623
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    Effects of nonresonant magnetic fields (RF photons) have been investigated on 23Na and 35Cl NQR in NaClO3. Shifts and splittings of Na NQR and lengthening of T2 of Cl NQR due to the nonresonant fields have been observed and analyzed in terms of the theory of dressed atoms. The experimental results are in good agreement with the theoretical ones.
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  • Absorption Distances in the Dynamical Theory of Electron Diffraction
    Yoshihiro Kamiya, Toshiaki Goto
    1982Volume 51Issue 11 Pages 3633-3636
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3633
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    The contrast effect of the electron microscopic image at crystal defects is characterized by two parameters; extinction distance and absorption distance. Both quantities are originally defined for the elastic scattering. Since the inelastic scattering contributes to the electron microscopic image, parameters used for the interpretation of the images are not the same as those for the elastic scattering. It is shown that the difference of absorption distance between the theoretical estimation and that used for interpretation is due to the contrast effect of the small angle inelastic scattering.
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  • Performance of a 241Am Compton Spectrometer and Compton Profile of Polycrystalline Al
    D. P. Mahapatra, H. C. Padhi
    1982Volume 51Issue 11 Pages 3637-3642
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3637
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    A γ-ray Compton spectrometer using a 200 mCi 241Am source and a HPGe detector has been designed and built. The performance of the spectrometer has been compared with similar spectrometers operating in other laboratories. The effect of air scattering from different air columns was studied. It was found to have no effect on the high energy side of the profile except that the profile becomes asymmetric. The equipment was tested for its potential use in Compton profile (CP) studies by making a measurement on polycrystalline aluminium. The measured profile has a good overall agreement with existing experimental and theoretical results. It shows a much better break near the Fermi momentum and is in better agreement with x-ray results. Our results for the Fermi momentum qF, 0.917±0.010 a.u., determined from the experimental autocorrelation function B(r) agrees fairly well with theories.
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  • Adiabatic Potential for cis-trans Isomerization of Rhodopsin Chromophore in the Deformed Excited State
    Hideo Suzuki, Ken Ishikawa, Toru Yoshihara
    1982Volume 51Issue 11 Pages 3643-3651
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3643
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    On the protonated retinal Schiff-base (PRSB) interacting with counter point charge e, the adiabatic potential for cis-trans isomerization of the first singlet excited-state is calculated as a function of rotation angle θ11−12 about C11–C12 bond, including the effects of the deformation in geometrical structure of the excited state after the absorption of light.
    It is shown that the potential curve of this deformed excited state is barrierless and downward concave whereas that of the ground state is upward convex, and that the two curves intersect in the vicinity of θ11−12=90°. It is also shown that, in the highly twisted conformation at θ11−12=90°, the deformed excited state is considerably polarized with almost positive charge |e| shifted into C12–N+16 fragment, so that the effect of e on the adiabatic potential of the deformed excited state is important.
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  • Model Potential Method in Hartree-Fock-Slater Formalism
    Shinichi Katsuki, Misako Inokuchi
    1982Volume 51Issue 11 Pages 3652-3659
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3652
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    A new formulation of the model potential method is developed within the Hatree-Fock-Slater (HFS) scheme. For the purpose of handy applications, the numerically-generated effective potentials are fitted to Bonifacic-Huzinaga type model potentials. Taking advantage of the intrinsically local property of the potentials in HFS formalism, the parameters involved in the model potentials are optimized using the least-square criterion for analytical functional fits without requiring any reference such as orbital energies or experimental term values etc. The frozen-core approximation which is the basic underlying notion of the theory is examined. It is shown that the model potential calculation of the electron population and orbital energies for carbon monoxide almost closely reproduces the all-electron calculation.
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  • Multi-Photon Ionization of Excited Atoms in Gaseous Discharge by Ruby Laser Light
    Toshihiko Ohno, Koichi Suzumura, Takayoshi Okuda
    1982Volume 51Issue 11 Pages 3660-3665
    Published: November 15, 1982
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3660
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    Multi-photon ionization of excited states of He or Hg atoms in glow discharge tube by ruby laser light were detected by using the induced variation of discharge current. The probabilities of one-photon, two-photon and three-photon ionizations with an intermediate resonance were also calculated. Laser induced current variation was explained by the calculated value of multi-photon emitted electrons. It was found that two-photon resonant three-photon ionization is dominant in He and three-photon ionization in Hg in case of rather high intense laer light.
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  • Forbidden Transitions in Helium and Lithium Due to Fluctuating Electric Fields for Plasma Diagnostics
    Ken Kawasaki, Tatehito Usui, Toshiatsu Oda
    1982Volume 51Issue 11 Pages 3666-3671
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3666
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    Suitable line pairs of the forbidden and the allowed lines in the helium and lithium lines are proposed for measurement of fluctuating electric fields with low frequency in plasmas. The forbidden line intensity with respect to the allowed one is calculated as a function of the electric field strength by using the quasi-static theory. For the electric field of more than several kV/cm, the forbidden line intensities are detectable. The fluctuating electric fields are observed in a small linear theta pinch plasma by using the proposed method. Two line pairs of HeI (HeI 491.1 nm/HeI 396.5 nm and HeI 663.2 nm/HeI 501.6 nm) are used for the observation. Both results obtained almost agree within the experimental uncertainty. The peak intensity of the observed fluctuating field is 5 kV/cm in the early phase of the implosion of the plasma.
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  • Molecular Deformation of Polymers in Concentrated Solutions
    Mitsunobu Sekiya, Masao Doi
    1982Volume 51Issue 11 Pages 3672-3680
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3672
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    When a concentrated polymer solution is macroscopically deformed, the average shape of individual polymers is also deformed from the equilibrium form. This molecular deformation, which can be experimentally measured by neutron scattering, is discussed theoretically on the basis of the tube model. A new formulation is given for calculating the average shape of polymers in non-equilibrium state. As an example, the deformation of polymers under steady shear flow, and elongational flow is predicted.
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  • Boosting Up of Neutral Beam Heating Power by Slowly Rising Toroidal Field
    Rui-yan Lin, Kei-ichi Hirano, Masao Okamoto, Katsu-hiro Shimizu, Tsune ...
    1982Volume 51Issue 11 Pages 3681-3688
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3681
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    A System of 1-D transport codes combined with Fokker-Planck codes has been used to simulate plasmas undergoing compression with beam injection for the ‘R-Project tokamak’. The results obtained from the combination of beam heating and compression are very encouraging. They show that by increasing the toroidal magnetic field and the plasma current simultaneously, it is possible to significantly increase the ion temperature with a very slow compression. The final ion temperature is very weakly dependent on the compression time τc from 0.5 sec to 1 sec for the ‘R-Project tokamak’. If the ‘R-Project tokamak’ plasma is compressed by increasing the magnetic field and plasma current simultaneously, then the beam power of 15 MW which is necessary to obtain an average ion temperature of 5 keV without compression can be reduced to 8.5 MW.
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  • Measurement of Time- and Space-Resolved Ion Temperature in a Theta-Pinch Plasma
    Toshiatsu Oda, Tadashi Ohgo, Yoshihumi Ito, Ken Kawasaki
    1982Volume 51Issue 11 Pages 3689-3695
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3689
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    Time- and space-resolved ion temperature Ti⁄⁄ in a theta pinch are obtained from spectroscopic measurement of the He II 468.6 nm line in the axial direction. At the maximum pinch, Ti⁄⁄ is 500 eV, ne=4×1015 cm−3 and Te=25 eV. At times after the implosion phase, t\gtrsim0.5 μs, Ti⁄⁄ keeps almost constant in the radial direction until the gradient of the magnetic field profile, measured by a probe coil, becomes steepest. Radial gradient of the ion temperature is observed outside the above region. Fast thermalization of the ions is observed, compared to binary collision times. We also find fast relaxation between Ti⁄⁄ and Ti⊥ which is obtained from the side-on measurement. This adduces another evidence to confirm that the fast thermalization of the ions is mainly due to some collisionless mechanisms.
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  • Toroidal Current Drive by Lower Hybrid Wave in WT-2 Tokamak
    Masahiko Nakamura, Teruji Cho, Shin Kubo, Takashi Shimozuma, Kouji Yam ...
    1982Volume 51Issue 11 Pages 3696-3704
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3696
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    When RF power Prf near the lower hybrid frequency is injected to a low density plasma in WT-2 tokamak, the loop voltage decreases and falls to a negative value, implying that an RF-driven current Irf is produced. The efficient RF-current generation is obtained as Irf⁄Prf≈0.6 kA/kW. The associated relaxation oscillation, where voltage spikes, step-like increases in electron cyclotron emission and X-ray bursts appear, and the correlated ion cyclotron instabilities are observed. These phenomena support the production of Irf in the toroidal plasma.
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  • Current Vorticity Theory of a Field Reversal Plasma
    Hiroshi Itô
    1982Volume 51Issue 11 Pages 3705-3710
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3705
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    The current vorticity of a plasma in the equilibrium with the magnetic field can be proved to be conserved with respect to the time when the electric resistivity is zero. This behavior of the plasma is closely related with the freezing condition of the magnetic field to the idealized plasma. In the stationary state, the total current vorticity of the confined plasma is constant and is determined by the current circulation existing on the inner surface of the coil in two-dimensional problem. By these results, it is proved that the section of a field reversal plasma should change from a circle into an ellipse to keep the total vorticity of the azimuthal diamagnetic current when the magnetic field on the axis decays by the particle diffusion. A mechanism for the axial rotation of the plasma column around the axis is also studied by the same process.
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  • Thermal Convection Caused by Ring-Type Heat Source
    Kunio Kuwahara, Yuko Oshima
    1982Volume 51Issue 11 Pages 3711-3719
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3711
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    Flow field due to thermal convection upon a ring type heat source is studied numerically and experimentally, which simulates hopefully the flow due to the devastating combustion just after the Great Kanto Earthquake. New numerical scheme was developed, which enables us to treat accurately singular or nonuniform grid system in finite-difference method. In experimental measurements, extremely low velocity and its fluctuation were detected by laser doppler velocimeter. Both results show the main flow due to the convection is strongly concentrated within the central portion above the ring where no heat is supplied at the bottom. Conspicuous unsteadiness was observed, which is considered to be the main cause of the tornado at the calamity of the Great Kanto Earthquake.
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  • Two-Soliton Resonant Interactions in One Spatial Dimension: Solutions of Boussinesq Type Equation
    Masayoshi Tajiri, Toshiyuki Nishitani
    1982Volume 51Issue 11 Pages 3720-3723
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3720
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    The soliton solutions of a Boussinesq type equation, utt−uxx+(u2)xx+uxxxx=0, are analysed to show that the resonant interactions of soliton exist also in one-dimensional propagation. Moreover, the two-soliton interactions of the Ka- domtsev-Petviashvili equation are discussed.
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  • Interrelation of Alternative Sets of Lax-Pairs for a Generalized Nonlinear Schrödinger Equation
    Kazu-hiro Iino, Yoshi-Hiko Ichikawa, Miki Wadati
    1982Volume 51Issue 11 Pages 3724-3728
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3724
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    Examination of the inverse scattering transformation schemes for a generalized nonlinear Schrödinger equation reveals the fact that the algorithm of Chen-Lee-Liu gives rise to the Lax-pairs for the squared eigenfunctions of the Wadati-Konno-Ichikawa scheme, which has been formulated as superposition of the Ablowitz-Kaup-Newell-Segur scheme and the Kaup-Newell scheme.
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  • Flow of Highly Rarefied Gas through a Circular Tube of Finite Length
    Kyoji Yamamoto, Jun-ichiro Hara, Koji Hirose
    1982Volume 51Issue 11 Pages 3729-3733
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3729
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    This paper concerns the flow of highly rarefied gas through a circular tube of finite length leading to a vacuum from a reservoir. First, the free molecular flow is considered. Then, the effect of intermolecular collisions is estimated by applying the iteration method to the B–G–K equation. The total mass flux through the tube is computed for several values of tube length. It is shown that the correction of the flux to the free molecular flow decreases with increasing tube length and becomes negative for a tube whose length is more than about eight times as large as its diameter.
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  • On the Benjamin-One Equation-Method for Exact Solution
    Yoshimasa Matsuno
    1982Volume 51Issue 11 Pages 3734-3739
    Published: November 15, 1982
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.51.3734
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    In the framework of the theory of the linear algebraic equation the structure of the Benjamin-Ono (BO) equation, which is a nonlinear integro-differential equation, is studied in detail. It is shown that the N-soliton solution of the BO equation is derived from the system of linear algebraic equations.
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