Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
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Volume 39, Issue 6
Displaying 1-42 of 42 articles from this issue
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  • Non-Steady Separation of Multicomponent Isotopic Mixtures in Clusius-Dickel Columns
    J. M. Saviron, D. González, J. L. Brun, J. A. Madariaga
    1975 Volume 39 Issue 6 Pages 1417-1421
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1417
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    Analytical expressions for the non steady separation factor of an isotopic multicomponent mixture in a thermal diffusion column are given. The results, which are appropiate for column operation at total reflux and cover the real case in which small non active end volumes are present, show a simple exponential rising of the logarithm of the reduced separation factor independent of the initial mixture composition. This fact is confirmed by experimental transient data previously reported by Brun et al. and by new experimental work presented here.
    It is shown that the relative variations of the relaxation time with the hot wire temperature and with the operation pressure are just those predicted by the Furry, Jones and Onsager theory. It is concluded that two experimental operations: steady-separation vs pressure and non-steady separation vs time, and the use of FJO theory will allow us the qualitative prediction of the column operation in the usual temperature and pressure range in laboratory operation
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  • A General and Unified Theory of the Homophone Sequences of Transitions in Which the Soft Modes are Doubly Degenerate
    Kêitsiro Aizu
    1975 Volume 39 Issue 6 Pages 1422-1430
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1422
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    Of homophone systems of phase transitions, especially those in which the soft modes are doubly degenerate are investigated in a general and unified way upon the basis of the considerations in the preceding paper [K. Aizu: J. Phys. Soc. Japan 38 (1975) 1592]. It is found that three general forms are possible for their pedigrees. It is clarified what character of the prototypic phase and the soft modes are responsible for this essential differentiation of pedigrees. The number of all situations of a ferroic phase of each rank in each general pedigree is determined. Illustrations are carried out with some cases where the space group of the prototypic phase and the transformation property of the soft modes are specified.
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  • The Induction Phenomenon and Ergodicity in the Anharmonic Lattice Vibration
    Nobuhiko Saitô, Naoteru Hirotomi, Atsushi Ichimura
    1975 Volume 39 Issue 6 Pages 1431-1438
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1431
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    It is shown that the induction phenomenon in the exchange of energies of normal modes found by computer experiments is an inherent property of the anharmonic lattice vibration and its behavior obeys the time reversal even after the elapse of the induction period. The instability of the normal modes when one mode is excited initially is related to the induction phenomenon, and is discussed by the application of the instability region of the Mathieu function. The exponential orbital separation is also shown to take place after the elapse of the induction period. This guarantees the C-property of the anharmonic lattice vibration.
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  • Dimensionality of Density Fluctuations and the Excitonic Phase of Electron-Hole Systems in Strong Magnetic Fields
    Hidetoshi Fukuyama, Toshio Tsuzuki, Sadao Nakajima
    1975 Volume 39 Issue 6 Pages 1439-1442
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1439
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    Dimensionality of the density fluctuation of electron-hole systems in strong magnetic fields is examined in connection with the possibility of the excitonic phase. Our system consists of one conduction and one valence band. Even in extremely strong fields where only one Landau level of each carrier is taken into consideration and the energy spectrum is purely one-dimensional, the density fluctuations are three-dimensional as far as magnetic field strength is finite. This is due to the motion of carriers which is perpendicular to the field and caused by interactions. Thus the phase transition with the excitonic order parameter may occur at a finite temperature. However, as the field is increased, fluctuations acquire one-dimensional characteristics and critical temperature should be reduced.
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  • A Theory for Self-Trapped Magnetic Polaron in Ferromagnetic Semiconductor with a Narrow Band
    Tsuneharu Takeda, Tadao Kasuya
    1975 Volume 39 Issue 6 Pages 1443-1453
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1443
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    In a ferromagnetic semiconductor with a narrow band the mechanism which causes magnetization of localized spins around a conduction electron is similar to that of the double exchange interaction, and the potential which traps the conduction electron is a pseudopotential. It is shown that the spin flip processes of the conduction electron make the magnetic polaron unstable, and that even in the case of the narrow band limit the radius of the magnetic polaron is large extending over many lattice sites. These properties are different from those of the usual lattice polaron in narrow band.
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  • Current-Induced Transition Characteristics of Superconductors in Longitudinal Magnetic Field
    Masanori Sugahara
    1975 Volume 39 Issue 6 Pages 1454-1461
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1454
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    Basing on the time-dependent Ginzburg-Landau theory, we investigate the current-induced-transition state of type II superconductors in longitudinal magnetic field. A new mixed state in space-time domain is found, where the time integral of voltage difference is quantized in flux quantum. Experimentally observed transition properties in Pb films are explained with the help of the theoretical investigation. Interference patterns appeared in current-voltage curves give a conclusive evidence of the new mixed state in the transition state of superconductors.
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  • Annealing Effects on the Magnetic Anisotropy of LPE Garnet Thin Films
    Masahiro Hirano, Shinichi Nakamura, Tachiro Tsushima
    1975 Volume 39 Issue 6 Pages 1462-1466
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1462
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    Annealing behavior of magnetic anisotropy in LPE garnet films are investigated. There exists a good correlation between the activation energy for the decreasing process of Ku and the difference between the ionic radii of the constituent rare earth ions. It implies that this difference is the physical origin for the nonuniform distribution of the rare earth ions which results in the presence of the uniaxial anisotropy. Further, the anisotropy with cubic symmetry is enhanced by the nonuniform distribution.
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  • Study of Anomalous Surface Magnetization of Ni by Polarized Neutrons
    Masatoshi Sato, Kinshiro Hirakawa
    1975 Volume 39 Issue 6 Pages 1467-1472
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1467
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    The surface magnetization of Ni fine particles has been measured by the small angle scattering of polarized neutrons. It is pointed out that the θ dependence of the flipping ratio R(θ) scattered at small angles θ is very sensitive to the existence of anomalous magnetic surface layers but insensitive to the existence of particle-particle spacial correlations. Beside these, the scattering cross section is extremely high, encouraging us to study the surface state by neutron scattering. Based on the informations of the radius of Ni and the thickness of the NiO coverage obtained from X-ray diffraction, a model is proposed so as to get a best fit to the observed R(θ). According to this model, there exists about 3∼4 magnetic dead layers or 2 layers of reversed magnetization at the Ni surface.
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  • Anomalous Electric Fields in Semimetals under High Magnetic Fields
    Katsukuni Yoshida
    1975 Volume 39 Issue 6 Pages 1473-1481
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1473
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    Anomalous electric fields which have been observed in bismuth and antimony in high magnetic fields at low temperatures are investigated with particular reference to specimen size. The anomalous fields, contrary to the usual magnetoresistance, appear in the form of dip and hump in the angular-dependence diagram of the potential difference which is measured at a side surface of specimen. Since the dip and hump are strongly affected by geometrical conditions such as specimen size and location of current electrodes, the anomalous electric fields are considered to originate from the inhomogeneous current distribution, which is expected when the cross-section of specimen is large compared with the contact area of current electrodes.
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  • Doublet Structure of the L2,3 Absorption Edge Singularity of Na Metal
    Yositaka Onodera
    1975 Volume 39 Issue 6 Pages 1482-1485
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1482
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    The singularity of the L2,3 X-ray absorption edge of light metals possesses a doublet structure owing to the spin-orbit splitting of the core p level. The observed intensity ratio of the doublet is deviated from the expected 2:1. The deviation can be explained by introducing the electron-hole exchange scattering. A line shape formula is obtained which takes account of the exchange and spin-orbit interactions. It is used to analyse the Na spectra with success.
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  • Optical Absorption Bands of Off-Center Ag+ in CsBr
    Tsunekazu Matsuyama, Masahiro Saidoh, Noriaki Itoh
    1975 Volume 39 Issue 6 Pages 1486-1491
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1486
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    The optical absorption bands associated with the d10(1S)→d9s(1D, 3D) transitions of Ag+ in CsBr are studied. The area under the absorption curve decreases with increasing temperature from 10 K to room temperature, indicating that the Ag+ ion in CsBr is in a deep off-center potential. Ten optical absorption bands are identified and these are ascribed to the transitions from the d10 multiplets to the d9s multiplets split in a C3v symmetry. Good agreement between the experimental and calculated transition energies are obtained, although the poor agreement has been reported for alkali halides with NaCl-structure. This results is discussed in terms of the molecular orbital formation between the Ag+ ion and neighboring halogens.
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  • NMR Study on Heavily Doped Silicon. II
    Seiichiro Ikehata, Wataru Sasaki, Shun-ichi Kobayashi
    1975 Volume 39 Issue 6 Pages 1492-1497
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1492
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    Spin echo spectra, Knight shift and spin-lattice relaxation time are measured on 31P in silicon crystals with phosphorus concentrations ranging from 4.5×1018cm−3 to 9.6×1019cm−3 over a temperature region from 4.2 K to 0.4 K. The shift and width of 31P line is atrributed to the inhomogeneous electron contact field. The results together with those of 29Si (J. Phys. Soc. Japan 36 (1974) 1377) support the Mott transition mechanism of metal-non metal transition and allow to interpret various properties of the metallic samples in terms of an electron gas with correlation.
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  • Intrinsic Luminescence in KI and RbI under Two-Photon Excitation
    Takehisa Yoshinari, Masamitsu Hirai
    1975 Volume 39 Issue 6 Pages 1498-1505
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1498
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    It has been confirmed that KI and RbI crystals under the two-photon excitation by a dye laser exhibit three emission bands at 3.05 eV, 3.31 eV, 4.10 eV and 2.27 eV, 3.12 eV, 3.96 eV, respectively, which are the same as those under the conventional one-photon excitation at low temperature. The intensity of the 3.05 eV and 3.31 eV emissions in KI decay with respective two decay times. The fast and slow components of these emissions exhibit almost identical emission spectra with the half width of 0.33±0.03 eV. The 2.27 eV and 3.12 eV emissions in RbI decay also by the fast and slow decay times. Temperature dependence of the decay time and intensity of these emissions has been studied, and possible electronic states responsible for these emissions are discussed.
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  • Excitonic Molecule. III. Electronic Structure
    Eiichi Hanamura
    1975 Volume 39 Issue 6 Pages 1506-1515
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1506
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    The electronic structure of excitonic molecule is discussed by taking into account the detailed band structure of CuCl, CuBr, CdS, CdSe and ZnO. Especially the excitonic molecule in CuBr is interesting due to the less simple valence band. The fine structure of the excitonic molecule is clarified under the effective electron-hole exchange effect and the interband hole-hole scattering beyond the effective mass approximation.
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  • Excitonic Molecule. IV. Optical Properties
    Eiichi Hanamura
    1975 Volume 39 Issue 6 Pages 1516-1524
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1516
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    The optical properties of the excitonic molecule are clarified, basing upon the electronic structure of the excitonic molecule derived in the preceding paper. The luminescence, the optical conversion of a single exciton into the excitonic molecule and the giant two-photon absorption due to the excitonic molecules are theoretically discussed and compared with the available experimental data.
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  • Comments on Electrostrictions in KH2PO4
    Yoshihiro Ishibashi, Yutaka Takagi
    1975 Volume 39 Issue 6 Pages 1525-1528
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1525
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    The electrostrictions in KH2PO4 are discussed. It is shown that both the spontaneous strain in the ferroelectric phase and the field-induced strain in the paraelectric phase can be interpreted in a unified fashion even in terms of the simplest Slater model by taking into account the coupling between the strain and the fraction of sideway H2PO4− radicals, r. The order parameter θ, previously introduced by other workers, may not be necessary for the explanation of the peculiar nateur of the electrostrictions in this material.
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  • Dielectric Study on Globule-Coil Transition in Polymer Solution
    Satoru Mashimo, Yasuo Iwasa, Akio Chiba, Kenichi Shinohara
    1975 Volume 39 Issue 6 Pages 1529-1537
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1529
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    Dielectric transition similar to that found in poly(vinyl acetate) solution was also observed in dioxane solution of poly(vinyl chloride) and poly (p-chlorostyrene) in carbon tetrachloride. It is shown that the dielectric dispersion observed above the transition temperature is attributed to a rotational motion only of a few monomeric units between two bonds undergoing rotation. On the other hand, below the transition temperature, the chain motion is subject to restriction caused by some intrachain interaction and a large number of the monomeric units must move together because of that interaction. Measurements of the intrinsic viscosity on poly(vinyl acetate) in carbon tetrachloride and poly(vinyl chloride) in dioxane show that the transition is a conformational transition from a loosely coiled chain molecule to a compact chain molecule. It is shown that the transition is a kind of globule-coil transition suggested theoretically by some authors.
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  • Ultrasound Velocity in TGSe near the Ferroelectric Phase Transition
    Isamu Todo
    1975 Volume 39 Issue 6 Pages 1538-1542
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1538
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    The temperature dependence of elastic stiffness constant C22 and ultrasound velocity of TGSe single crystals have been measured accurately near the ferroelectric phase transition. It is found that the anomalous part of the elastic stiffness constant Δ C22 and that of sound velocity are both proportional to log(T−Tc). The anomalous attenuation Δα1⁄2 in the paraelectric phase transition is also proportional to log(T−Tc).
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  • Effects of Uniaxial Stress on the Electrical Properties in CdS Single Crystals
    Koichi Matsuura, Ichiro Tsurumi
    1975 Volume 39 Issue 6 Pages 1543-1546
    Published: December 15, 1975
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1543
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    Measurements of the conductivity and the Hall effect in high conductivity CdS crystals have been made at liquid nitrogen temperature, under the compressional uniaxial stress applied parallel or perpendicular to the c-axis. It has been found that the change in the conductivity induced by the applied stress is substantially due to the change in the electron mobility. The mobility decreases with increasing the stress when the mobility under zero stress is near the intrinsic mobility, while the mobility increases with the stress when the mobility under zero stress is smaller than the intrinsic mobility. This behavior is explained in terms of the negative stress coefficient of the intrinsic mobility, (−2.9±0.5)×10−11dyn−1cm2 and the positive coefficient of the extrinsic mobility, (2.7±0.3)×10−10dyn−1cm2.
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  • Quantum Oscillation in Absorption of Ballistic Heat Pulse in Bismuth
    Takehiko Ishiguro, Koji Kajimura, Seiichi Kagoshima, Hiroshi Tokumoto, ...
    1975 Volume 39 Issue 6 Pages 1547-1557
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1547
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    Spike-like quantum oscillation is found in the absorption of longitudinal heat pulse propagating in Bi under magnetic fields. By comparing the period with that of the de Haas-van Alphen oscillation, we find that the electrons are concerned with the oscillation. Absorption of any phonon occurs only when the change in perpendicular component (to the magnetic field) of electron wave number accompanying the absorption is smaller than the inverse of the cyclotron radius. This fact allows the electron transition within a Landau level to occur only when the bottom of the Landau level is close to the Fermi level. This explains occurrence of spike-like oscillation even for the heat pulse with a broad frequency spectrum. The background comes from transition between different Landau levels. Concerning the transverse mode, the amplitude of the oscillation is smaller than the longitudinal mode by one order of magnitude.
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  • c-Axis Spacing Changes in Pyrolytic Graphite after Neutron Irradiation at 5 K
    Hiroshi Maeta, Tadao Iwata, Shigeo Okuda
    1975 Volume 39 Issue 6 Pages 1558-1565
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1558
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    Change in the c-axis spacing in pyrolytic graphite after fast neutron irradiation at 5 K and subsequent isochronal pulse annealings have been measured in the range of 5∼900 K by X-ray diffraction method. The c-axis expansion was estimated to be Δc0⁄c0=3.4Ni, where Ni is the fractional concentration of interstitial atoms. This corresponds to a volume change of 3.3 atomic volume per interstitial atom. For annealings of the c-axis spacing, a small recovery below 80 K was followed by a large recovery at around 100 K, and above it a small continuous recovery occurred up to 900 K. The large recovery at around 100 K was interpreted by the formation of C2 molecules and interstitial clusters. The present results were discussed comparing with the so far reported results of electrical resistivity, thermal resistivity and stored energy release measurements.
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  • Low-Temperature Deformation and Dislocation Mechanism in LiF
    Takayoshi Suzuki, Hyongyu Kim
    1975 Volume 39 Issue 6 Pages 1566-1571
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1566
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    The temperature and strain-rate dependence of the critical resolved shear stress of LiF single crystals has been measured in the temperature range from 4.5 to 300K. The results are analysed on the basis of the thermally activated deformation process. The data below 20K are shown to correlate well with the requirements of the Peierls mechanism. The Peierls stress is deduced to be 2.0 kg/mm2 when the parabolic Peierls potential is assumed, and 1.75 kg/mm2 for the sinusoidal case. The estimated value of the activation energy is about 0.09 eV, which give a reasonable value for the line energy of a dislocation. The activation volumes determined by changes in strain rate also exhibit the proper trends for the Peierls mechanism.
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  • Exciton Absorption Lines in Antiferromagnetic LuCrO3
    Masako Kajiura, Kiyoshi Aoyagi, Takahiko Tamaki
    1975 Volume 39 Issue 6 Pages 1572-1578
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1572
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    Optical properties of R-excitons in LuCrO3 as well as their change during the magnetic-field-induced spin reorientation have been investigated. It is shown that the polarization characters of the exciton lines agree with the theory of the Frenkel excitons in antiferromagnetic rare-earth orthochromites. By using the available theory, parameters related to the excitation transfer matrix elements of Cr3+ ions in LuCrO3 are determined. The energy shift and intensity change of the exciton lines during the spin reorientation are discussed and compared with those in YCrO3.
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  • X-Ray Raman Scattering. III. The Angular Dependence of the Scattering Intensity
    Tadasu Suzuki, Hisao Nagasawa
    1975 Volume 39 Issue 6 Pages 1579-1585
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1579
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    The angular dependence of the intensity of X-ray Raman scattering from polycrystalline beryllium and graphite has been studied using Cr Kβ1 and Cu Kα radiations, respectively. At lower scattering angles the angular dependence of the peak intensity values of the Raman band is in good agreement with the theoretical curve deduced from the dipole approximation. A marked discrepancy, however, appeared at higher scattering angles. This discrepancy could be mitigated by an improved analysis which takes into account the multipole transitions. The expression obtained for the intensity of the X-ray Raman scattering is:
    (Remark: Graphics omitted.),
    where “a” denotes the mean radius of the charge distribution of the K-electron of the scatterer elements, T1(λ) and T2(λ) are related with the dipole and multipole transitions, respectively.
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  • Compton Profile of Ultra-Fine Particles of Copper
    Yoshimi Tsuchiya, Seiichiro Noguchi, Tomoe Fukamachi, Sukeaki Hosoya
    1975 Volume 39 Issue 6 Pages 1586-1589
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1586
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    Comption profile of ultra-fine particles of Cu was measured by the use of a solid state detector and 241Am isotope γ-ray source. The momentum distribution of electrons in such particles has been investigated in comparison with a polycrystalline Cu. The profile of these particles has proved to have an FWHM value narrower than that of the polycrystalline sample. The narrowing is mainly attributed to the surface state of electrons. The results were discussed in comparison with those by positron annihilation for the corresponding sample.
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  • Low Energy Resonant Electron Scattering by O2 and NO
    Fumihiro Koike
    1975 Volume 39 Issue 6 Pages 1590-1595
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1590
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    Theoretical investigations are made for elastic scattering and vibrational excitation via a vibrationally excited transient ionic state, following the reaction e+AB→AB−**(υ′)→AB(υ)+e. Restrictions on the electronic wave number k and on the resonant partial wave angular momentum l are such that k<<1 and l≥1. A threshold law is proposed: a resonance width between the vibrational υ and υ′ states, Γυυ′, is proportional to k2l+1 multiplied by a square of the Franck-Condon factor Fυυ′. This is an extention of the usual Wigner rule, Γυυ′∝k2l+1.
    The results of semi-empirical calculations are presented for O2 and NO. By using only one calibration parameter, satisfactory results are obtained. Resonance widths of the transient υ′ states and energy integrated vibrational excitation cross sections are calculated. For the life time of O2−**(υ′=4), 7.2×10−11sec is obtained. This value is consistent with all available experimental data.
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  • Measurement of Time Development of Local Conductivity of Turbulent Plasma in a Magnetic Mirror Bottle
    Masao Ushio, Tsutomu Ishimura
    1975 Volume 39 Issue 6 Pages 1596-1602
    Published: December 15, 1975
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1596
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    The measurement of time development of plasma conductivity in a turbulent heating is done at various radial positions in a plasma by using an electric probe and a Rogowsky coil by which the quasi static electric field strength and current density are measured. In the early phase of the discharge, the plasma conductivity in the current penetrating domain shows anomalously low value ranging from 1.7 to 7 Ω−1cm−1, that is of the order of one tenth of one tenth of the classical one at 2 eV in electron temperature, despite that the overall voltage waveform does not show any resistive hump. After the full penetration of the current to the column axis the conductivity begins to drop rapidly at all radial points and the resistive hump of the overall voltage waveform begins to rise, and the macroscopic instability grows.
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  • Application of Bipolar Coordinates to the Two-Dimensional Creeping Motion of a Liquid. II. Some Problems for Two Circular Cylinders in Viscous Fluid
    Shoichi Wakiya
    1975 Volume 39 Issue 6 Pages 1603-1607
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1603
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    The bipolar coordinate solution of the two-dimensional Stokes equations is applied to flows around two circular cylinders. It is proved that there are three cases which this kind of solutions can describe. Solutions are presented for a cylinder revolving eccentrically in a cylindrical frame, a cylinder in the neighborhood of a plane wall and two cylinders in rotary motion as a pair.
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  • Nonequilibrium Flow of Nitrogen Behind a Strong Normal Shock Wave
    Ri’ichi Matsuzaki
    1975 Volume 39 Issue 6 Pages 1608-1613
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1608
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    The nonequilibrium flow properties behind a strong normal shock wave in the nitrogen gas are studied by using a set of equations which was developed previously by the author to be applied to a quasi-one-dimensional flow of a partially ionized nitrogen. Numerical solutions of this set of equations show some typical flow properties in nonequilibrium. The flow is not only in chemical nonequilibrium, but also in thermal nonequilibrium between electrons and heavy particles. Regardless of its initial values, the electron temperature is always lower than that of heavy particles.
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  • Integrability and a Solution for the One-Dimensional N-Particle System with Inversely Quadratic Pair Potentials
    Katuro Sawada, Takeyasu Kotera
    1975 Volume 39 Issue 6 Pages 1614-1618
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1614
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    Integrals of Hénon’s type are given for the system with inversely quadratic pair potentials. The explicit time dependence of solution are given for the repulsive case. A little extension and modification make it possible to have a solution for the system with quadratic and inversely quadratic pair potentials.
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  • Sound Attenuation in One-Dimensional Magnetic Systems
    Katsuhiko Nagano, Hisao Okamoto
    1975 Volume 39 Issue 6 Pages 1619-1620
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1619
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    The sound attenuation constant is calculated for the one-dimensional ferromagnet. Its frequency and angular dependence turn out to be ωk3⁄2 and cos4θ, respectively. The effect of the uniaxial anisotropy is also taken into account in a self-consistent way.
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  • Anomalous Differential Resistances in Point Contact Josephson Junctions
    Masaaki Kaminaga
    1975 Volume 39 Issue 6 Pages 1621-1622
    Published: December 15, 1975
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1621
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    New structures of voltage-current characteristics in Nb-Nb point contact Josephson junctions were found by using a differentiation technique. The first and the second derivatives of junction voltage with respect to the current as a function of bias reveal finer structures than V–I characteristics of junction. These new structures can be regarded as the result of thermal runaway of multiple point contacts in the Josephson junctions due to Joule heating. When one of the multiple point contacts suffers thermal runaway, the resistance of the junction changes suddenly and the peaks appear in V–dV⁄dI and V–d2V⁄dI2 characteristics.
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  • Search for Orbital Ordering in CoS2
    Yuji Ito, Akira Ohsawa
    1975 Volume 39 Issue 6 Pages 1623-1624
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1623
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    Antiferromagnetic orbital ordering patterns of CoS2 in which four Co atoms at fcc positions of pyrite structure have different orbital states are searched for using the polarized neutron diffraction technique. We concluded negative results on the antiferromagnetic orbital patterns investigated, with the four orbital states being all equal within the experimental accuracy.
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  • Anomalous Weak Ferromagnetism in Ferroelectric CuCl Boracite
    Munetaka Haida, Kay Kohn, Jinzo Kobayashi
    1975 Volume 39 Issue 6 Pages 1625-1626
    Published: December 15, 1975
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1625
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    Measurements of magnetic torque and magnetoelectric susceptibility of CuCl boracite indicate that both weak ferromagnetic moment and spontaneous polarization are parallel to the [001] axis at 4.2 K and consequently its magnetic point group is m′m′2. The result indicates the existence of a new group of boracite where weak ferromagnetic and electric moments are parallel.
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  • Detailed Mössbauer Hyperfine Parameters of the Low Temperature Phase of Fe3O4
    Junji Mada, Shuichi Iida
    1975 Volume 39 Issue 6 Pages 1627-1628
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1627
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    Mössbauer spectra of low temperature phase of Magnetite (Fe3O4) has been studied by changing θ(the cooling-field angle measured from [001] to [1\bar10] within the (110) plane). Data were analyzed for θ=0° and 40° cases with a computer and new assignments have been obtained.
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  • Enhanced Pseudo Nuclear Quadrupole Interaction and Nuclear Magnetism in Praseodymium Metal
    Tsuyoshi Murao
    1975 Volume 39 Issue 6 Pages 1629-1630
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1629
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    Nuclear magnetic properties of the single crystal (paramagnetic) and the polycrystal (ordered) praseodymium metal are discussed by using the effective nuclear spin Hamiltonian recently derived by the author. The Hamiltonian can explain the anomalous nuclear specific heat of the single crystal praseodymium metal as well as the magnitude of the nuclear Curie temperature found in this crystal in a consistent way. Informations can also be obtained for the low-lying states of the 4f electrons.
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  • Superconductivity in InAs Surfaces
    Shinji Kawaji, Shin-ichiro Miki, Takao Kinoshita
    1975 Volume 39 Issue 6 Pages 1631-1632
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1631
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    Superconducting resistive transition is observed in n-type inversion layers on p-type InAs surfaces. The transition temperature is about 2.7 K. Overall behaviours are phenomenologically well explained by the theory of fluctuation effects in two-dimensional superconductors.
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  • Threshold of Lower Hybrid Parametric Instability in a Modulated Electron-Beam—Plasma System
    Tsuyoshi Imai, Kiyoshi Yatsui
    1975 Volume 39 Issue 6 Pages 1633-1634
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1633
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    An experimental study of parametric instability driven by a beam modulation near the lower hybrid frequency is presented. If the modulation voltage exceeds a threshold value, the pump wave appears to decay into an ion acoustic wave and a lower hybrid wave. The threshold electron drift speed is found to be of the order of the ion acoustic speed as predicted by a theory of parametric instability in an inhomogeneous plasma.
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  • A Note on Nonlinear Differential-Difference Equations
    Kazuaki Narita
    1975 Volume 39 Issue 6 Pages 1635-1636
    Published: December 15, 1975
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1635
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    New classes of the differential-difference equations which lead to the Volterra system are presented and the special solutions of those equations are obtained.
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  • Invar Properties of Cementite (Fe1−xMex)3C, Me=Cr, Mn, Ni
    Toshihiko Shigematsu
    1975 Volume 39 Issue 6 Pages 1636A
    Published: December 15, 1975
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1636A
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  • A New Photoconduction Band in CdS Crystal Produced by Electron Irradiation
    Koichi Matsuura, Toshio Honjo, Ichiro Tsurumi
    1975 Volume 39 Issue 6 Pages 1636B
    Published: December 15, 1975
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1636B
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  • Angular Distributions of Neutrons from Pre-Compound Decay
    Yoshiro Irie, Mikio Hyakutake, Masaru Matoba, Masateru Sonoda
    1975 Volume 39 Issue 6 Pages 1636C
    Published: December 15, 1975
    Released on J-STAGE: May 29, 2007
    DOIhttps://doi.org/10.1143/JPSJ.39.1636C
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