Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
Volume 50, Issue 11
Displaying 1-50 of 57 articles from this issue
  • Keizo Murata, Hiroyuki Anzai, Gunzi Saito, Koji Kajimura, Takehiko Ish ...
    1981 Volume 50 Issue 11 Pages 3529-3530
    Published: November 15, 1981
    Released on J-STAGE: May 29, 2007
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    Superconductivity along the least conductive (in the normal state) c*-axis of the di-(tetramethyltetraselenafulvalene)-perchlorate [(TMTSF)2ClO4] was observed by conductivity measurement, showing evidently three dimensional ordering of superconductivity although the coupling was weak in the c*-direction. Contrary to the appearance of finite resistance below the superconducting transition along the most conductive a-axis, the finite resistance was not detected in the c*-axis.
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  • Takao Goto, Takao Kawai
    1981 Volume 50 Issue 11 Pages 3531-3532
    Published: November 15, 1981
    Released on J-STAGE: May 29, 2007
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    The nuclear spin-lattice relaxation time T1 of 133Cs in one-dimensional Ising-like antiferromagnet CsCoCl3·2H2O was measured in the paramagnetic state where short-range orders are well developed. Most of experimental features were interpreted in terms of the diminution of the longitudinal spin correlation due to the random passings of domain boundaries, which is described by an approximate equation T1−1∼exp (|J|⁄kT).
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  • Hiroshi Fujiwara, Motoyuki Nomura, Hideoki Kadomatsu, Nobuyuki Nakagir ...
    1981 Volume 50 Issue 11 Pages 3533-3534
    Published: November 15, 1981
    Released on J-STAGE: May 29, 2007
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    Lattice compressions along the a- and c-axes of compounds Fe2P and Ni2P were measured at room temperature by means of X-ray diffraction under hydrostatic pressures up to 100 kbar. Compressions were linear with pressure, and the a-axis was more compressive than the c-axis in Fe2P, while the situation was reverse in Ni2P.
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  • Kazuo Gesi
    1981 Volume 50 Issue 11 Pages 3535-3536
    Published: November 15, 1981
    Released on J-STAGE: May 29, 2007
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    Single crystals of cesium tetraiodozincate, Cs2ZnI4, were prepared, and the dielectric constants along the three crystallographic axes were measured below room temperature. As temperature decreases, the dielectric constant along the b-axis first increases, shows a change in the temperature derivative at 110 K, a λ-type peak at 102 K, and a discontinuous decrease around 90 K. These anomalies correspond to phase transitions.
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  • Yoshiro Suzuki, Hirofumi Ohtani, Shoji Takagi, Masamitsu Hirai
    1981 Volume 50 Issue 11 Pages 3537-3538
    Published: November 15, 1981
    Released on J-STAGE: May 29, 2007
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    Time resolved absorption spectra under the two photon excitation by the second harmonics from a mode locked ruby laser (∼40 ps) have been measured in KI. Instantaneous growth of the tail of the Vk band within the pulse duration was observed with almost equal efficiency at LHeT and RT. The Vk band turned into the Trip. band of the STE within about 500ps at LHeT, while into the F band within a few decades of ps at RT. These results suggest the Vk center as the primary product, and no activation energy barrier for the holes to self-trap. The results are discussed by Toyozawa’s model qualitatively.
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  • Toshinari Ichihashi, Manabu Kato, Nobuhiko Wada
    1981 Volume 50 Issue 11 Pages 3539-3540
    Published: November 15, 1981
    Released on J-STAGE: May 29, 2007
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    The quenched high pressure phase of MnF2 (MnF2-IV, Orthorhombic, α-PbO2 type) were found by X-ray diffraction method in the fine particles prepared by the gas-evaporation in He and Ar. A proportion of such particles to the normal ones with the rutile structure (MnF2-I) increased with increasing pressure of environment gas (3∼500 Torr).
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  • Yoh Itoh, Nobuo Kobayashi, Yozaburo Kaneko
    1981 Volume 50 Issue 11 Pages 3541-3542
    Published: November 15, 1981
    Released on J-STAGE: May 29, 2007
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    Direct fine-structure transitions, j=3⁄2→1⁄2 and j=1⁄2→3⁄2, were first observed with an ion energy-loss spectrometer at near 0°. The ions were produced with an electron-impact ion source. The peak heights corresponding to both transitions were almost the same over the energy range studied. The ratio of the 3/2 to 1/2 states in the primary ions was determined to be in statistical ratio, 2 : 1, assuming detailed balance for the transitions. Partial excitation cross-sections for the forward scattering within the angle ±0.45° were evaluated from the spectra obtained.
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  • Hisako Urabe, Yasunori Tominaga
    1981 Volume 50 Issue 11 Pages 3543-3544
    Published: November 15, 1981
    Released on J-STAGE: May 29, 2007
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    The low frequency collective modes of DNA in aqueous solution have been observed by Raman spectroscopy. The broad response at ∼85 cm−1 disappears when DNA is thermally denatured. This fact indicates the existence of characteristic motion of the DNA double helix.
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  • Kiyoshi Ueda, Hideki Iimura, Masayoshi Karasawa, Kuniya Fukuda
    1981 Volume 50 Issue 11 Pages 3545-3546
    Published: November 15, 1981
    Released on J-STAGE: May 29, 2007
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    The hook method has been applied to the 4s4p 3P0-4p2 3P1, 4s4p 3P1-4p2 3P0 and 4s4p 3P2-4p2 3P1 transitions at 2079 A, 2097 A and 2104 A as well as to the visible multiplet 4s4p 3P0,1,2-4s4s 3S1 at 4680 A, 4722 A and 4811 A. Relative oscillator strengths are determined to be f2079f4680*=4.4±1.1, f2097f4722*=1.5±0.4 and f2104f4811*=1.3±0.4. Uisng known f* values of the visible multiplet the gf values are obtained to be gf2079=0.63, gf2097=0.63 and gf2104=0.90.
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  • Toshiatsu Oda, Ken Kawasaki, Tadashi Ogo, Yoshihumi Ito
    1981 Volume 50 Issue 11 Pages 3547-3548
    Published: November 15, 1981
    Released on J-STAGE: May 29, 2007
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    Doppler profiles of the He II line from a small theta pinch plasma are measured to obtain ion temperature, and the fluctuating fields in the plasma are also measured under the same experimental condition. Fast heating and thermarization are observed when strong turbulence induced at early stage of the implosion phase is rapidly decaying.
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  • Hajime Takayama, Koh Wada
    1981 Volume 50 Issue 11 Pages 3549-3554
    Published: November 15, 1981
    Released on J-STAGE: June 01, 2007
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    Quantum-statistical phonon free energy of the one-dimensional since-Gordon system is calculated perturbationally with respect to the coupling constant. Its classical limit agrees completely with the phonon terms with anharmonic effects obtained by the transfer integral method. The free energy associated with the n=2 breather is shown to be a part of such anharmonic phonon terms.
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  • Hajime Takayama, Sei-ichi Takase
    1981 Volume 50 Issue 11 Pages 3555-3561
    Published: November 15, 1981
    Released on J-STAGE: May 29, 2007
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    For the purpose to study clustering feature in one sample of spin glasses by means of Monte-Carlo simulations, we devise a ‘bond pattern’ of the system, which is constructed by drawing stable right bonds (⟨σiσj sgn (Jij)⟩≅1) and stable wrong bonds (⟨σiσj sgn (Jij)⟩≅−1) in a figure. We apply this idea to a Gaussian Ising spin glass, and investigate temperature- and time-dependences of clusters in this system, which are sets of spins connected by such stable bonds.
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  • Hidetoshi Fukuyama
    1981 Volume 50 Issue 11 Pages 3562-3568
    Published: November 15, 1981
    Released on J-STAGE: June 01, 2007
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    It is shown that the intervalley impurity scattering affects the interaction dependent prefactor of logarithmic temperature dependence of the quantum correction to the conductivity. The result is compared with experiments on Si–MOS.
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  • Yoshihiro Yamada, Kyozo Ôhira
    1981 Volume 50 Issue 11 Pages 3569-3574
    Published: November 15, 1981
    Released on J-STAGE: June 01, 2007
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    NMR spin echo technique was used to study magnetic properties of the Laves phase compound Zr(Fe1−xMnx)2. For the C-15 type ferromagnetic compound (x≤0.3), 55Mn spectra showed well-resolved and regular satellites between 100 and 230 MHz at 15 K in zero external field. This suggests that Mn atoms have small magnetic moments which hardly change with x for x≤0.3. For the C-14 type compounds (x≥0.4), the experiment suggests that antiferromagnetism appears with the crystal structure transformation and disappears gradually with increasing x. The spin structure of the antiferromagnetic compound is discussed. The fine structure attributable to electric quadrupole interaction was observed in the 55Mn spectrum of ZrMn2. The value of e2qQh derived from the structure is 7.3 MHz.
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  • Hideya Onodera, Hisao Yamamoto
    1981 Volume 50 Issue 11 Pages 3575-3582
    Published: November 15, 1981
    Released on J-STAGE: June 01, 2007
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    Amorphous alloys having the composition (Fe1−xMnx)80B20 (0≤x≤0.25) have been studied by Mössbauer spectroscopy and magnetization measurements. All the samples show ferromagnetic behaviors. The saturation magnetization at 0 K, the Curie temperature TC and the average hyperfine field decrease monotonically from 197 emu/g, 680 K and 286 kOe in x=0 to 107 emu/g, 383 K and 178 kOe in x=0.25. The concentration dependence of TC gives a conclusion for the exchange interaction that JFe–Mn and JMn–Mn are relatively small positive and negative values, respectively, compared with JFe–Fe. The magnetic moments of the Fe and Mn atoms are discussed in connection with the exchange interaction.
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  • Shigeru Takatori, Naoshi Suzuki, Kazuko Motizuki
    1981 Volume 50 Issue 11 Pages 3583-3587
    Published: November 15, 1981
    Released on J-STAGE: May 29, 2007
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    We have studied the system with alternating strong and weak exchange coupling of constants J1 and J2 and found how the magnetic properties depend on the ratio J2J1. The results obtained for smaller J2J1 by calculation on the basis of the model of pair and lone spins much differ from those obtained by the simple molecular field approximation.
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  • Mitsuhiro Motokawa, Naoshi Suzuki, Kazuko Motizuki
    1981 Volume 50 Issue 11 Pages 3588-3589
    Published: November 15, 1981
    Released on J-STAGE: May 29, 2007
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    The magnetization of the single crystal RbMnCl3 has been measured at 4.2 K under the high magnetic fields and the results have been analyzed on the basis of the theory developed in the preceding paper I.
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  • Kazuo Sakai, Chikara Ishii, Hidetoshi Fukuyama
    1981 Volume 50 Issue 11 Pages 3590-3602
    Published: November 15, 1981
    Released on J-STAGE: June 01, 2007
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    Effects of impurities on the diamagnetic susceptibility of bismuth are examined on the basis of two-band model of Wolff. The impurity potential is assumed to be of short range but its strength can be arbitrary. The single impurity problem is first considered and it is shown that an impurity level emerges from the upper conduction (lower valence) band and lies above (below) the center of the band gap, when the strength of the potential exceeds a critical value. Assuming a small concentration of impurities, the modification of single electron density of states is calculated, and used in the evaluation of the correction to the diamagnetic susceptibility. It is shown that the contribution from the bound levels is paramagnetic or diamagnetic, according as the level is emerged from the conduction or valence band, reflecting the specific interband effects associated with the strong spin-orbit interaction. The effective g-factor of the electron spin in the impurity level is also derived.
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  • Kazuyoshi Takeda, Masaru Wada
    1981 Volume 50 Issue 11 Pages 3603-3611
    Published: November 15, 1981
    Released on J-STAGE: May 29, 2007
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    The first experimental study of the statistics of a quasi-one-dimensional Ising system under the magnetic field Hα, described by the Hamiltonian
    (Remark: Graphics omitted.)
    has been performed, where J1 and J2 are the intra- and the inter-chain exchange constants, respectively. A single crystal of the compound (CH3)3NHCoCl3·2H2O has been used as a model sample of the ferromagnetic system with J1kB=14.2 K and J2kB=0.20 K. It has been revealed that the experimental values of the magnetic heat capacity under the field Hα>2J2gzμB (≈0.8 kOe) applied along the spin preferential axis are excellently reproduced by the values calculated for the isolated Ising chain under the longitudinal field (α=z; gz=6.54). For the temperature higher than 7 K (≈J1⁄2kB), the experimental values of the magnetic heat capacity under the field along the spin hard axis have also agreed with the theoretical values for the isolated Ising chain under the transverse field (α=y; gy=3.90).
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  • Satoshi Iida, Shuzo Kawarazaki, Nobuhiko Kunitomi
    1981 Volume 50 Issue 11 Pages 3612-3619
    Published: November 15, 1981
    Released on J-STAGE: May 29, 2007
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    The magnetic properties of CrGe alloys have been investigated by neutron diffraction measurements. An addition of Ge to Cr increases the Néel temperature, the magnetic moment and the wave vector of the spin density wave (SDW). The commensurate SDW phase appears in the alloys containing Ge impurities more than 1 at.%. The observed features are discussed on the basis of the two band nesting model supposing that the Ge atom in Cr acts as electron donor and also on the model in which the Ge atom in Cr acts as the magnetic vacancy.
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  • Yoshiro Kakehashi
    1981 Volume 50 Issue 11 Pages 3620-3628
    Published: November 15, 1981
    Released on J-STAGE: June 01, 2007
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    Various magnetic properties of Fe and Ni are studied on the basis of the previously developed theory which takes account of the nonlocal spin fluctuation due to neighboring pair interactions. Calculated reductions of Tc are 14% for Fe and 2% for Ni, the SRO at Tc are 0.17 for Fe and 0.13 for Ni. The SRO causes the peak of the specific heat Cv at Tc higher than that in the single site theory, the slight decrease of Cv in the paramagnetic state near Tc with increasing temperatures and an downward convexity of the inverse susceptibility of Ni near Tc. It is also found that the effect of the SRO on the amplitude of the local moment, which never exist in the simple Ising model, causes the negative electronic contribution to the thermal expansion coefficient of Fe above Tc.
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  • Hiroshi Hatanaka, Tsuneo Hashi
    1981 Volume 50 Issue 11 Pages 3629-3636
    Published: November 15, 1981
    Released on J-STAGE: June 01, 2007
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    Effects of magnetic dipolar interaction between like nuclei on two-quantum (TQ) free decay were examined in a multi-level NMR system, Al in Al2O3. TQ free decay was observed using a TQ π⁄2-pulse followed by a probe pulse. The effect of probe pulse was carefully examined to deduce the intrinsic decay time of the TQ coherence. The second moments for two- and three-quantum transitions were calculated. The observed decay time is in good agreement with that obtained from the calculated second moment by assuming Gaussian decay. Basic equations for TQ resonance are also presented.
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  • Yutaka Nakai, Satoshi Iida
    1981 Volume 50 Issue 11 Pages 3637-3643
    Published: November 15, 1981
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    Both the amplitude of the magnetic moment M1 and the wave vector δ on the primary component of antiferromagnetic spin density wave in Cr(V) and Cr(Mn) alloys were measured by means of neutron diffraction. A linear relation of M12 to δ2 is found at each temperature. The observation leads to the expression for the magnetic moment density on the sublattice by a Jacobi’s elliptic sn function whose modulus varies with the composition. The sn function expression was found to be useful for the representation of the harmonics of the SDW, too.
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  • Fujio Kakinuma, Satoru Ohno
    1981 Volume 50 Issue 11 Pages 3644-3649
    Published: November 15, 1981
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    The electrical resistivities and the magnetic susceptibilities of liquid indium alloys containing rare-earth solutes have been measured from the melting point to about 1000°C. In the case of light rare-earth solutes, the additional resistivities increase from La to Nd solute with increasing the number of 4f electrons. The additional susceptibilities obey a modified Curie law. The temperature-independent susceptibilities are fairly large. Then, the effective magneton numbers are smaller than the values expected by the Van Vleck theory. These experimental results indicate that the 4f electrons of light rare-earth solutes interact with conduction electrons. The systematic variation of the additional resistivity for light rare-earth solutes might be attributed to the s–f or d–f mixing.
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  • Kouichi Ichikawa, Naoki Suzuki, Kenjiro Tsutsumi
    1981 Volume 50 Issue 11 Pages 3650-3654
    Published: November 15, 1981
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    The X-ray photoelectron spectrum and the Li K photoelectric yield spectrum of LiH have been measured to study the electronic structure of the valence band and the conduction band. The structure of the spectra is compared with the existing energy-band calculations of LiH. The calculated energy band including the correlation-relaxation effects explains qualitatively the observed shapes of the spectra. However, in detail there exist several discrepancies between the experimental and the calculated results with respect to the band width and the energy differences among the core level, the valence band and the conduction band.
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  • Seiichiro Ikehata, Taiji Ema, Shun-ichi Kobayashi, Wataru Sasaki
    1981 Volume 50 Issue 11 Pages 3655-3660
    Published: November 15, 1981
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    Magnetization in phosphorus doped silicon was measured with magnetic fields up to 95 kG and temperatures down to 1.5 K. The donor concentration of measured samples ranged from 0.53 to 6.5 times 1018 cm−3. The most heavily doped sample shows diamagnetic susceptibility which is consistent with a simplified picture of degenerate semiconductor. Other samples, including two metallic ones, show a temperature dependence of magnetization which can be attributed to free spins, and the number densities of free spins estimated from the magnetization curve are shown consistent with those estimated from the specific heat anomaly. The origin of these free spins is discussed with taking into account the intrastate Coulomb energy of localized states.
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  • Takeo Okamoto, Shigeru Minomura
    1981 Volume 50 Issue 11 Pages 3661-3663
    Published: November 15, 1981
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    The pressure dependences of the electrical resistance and the thermal activation energy of NbO2 were measured up to 150 kbar and 1200 K by using a Drickamer anvil and a wedge type cubic anvil high pressure apparatuses. The pressure-induced phase transition was observed at 85 kbar at room temperature. The high pressure phase was found to be a narrow gap semiconductor. Experimental results suggest that the weak Nb–Nb pair bond still exists in the high pressure phase.
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  • Tohru Suemoto, Hiroshi Kanzaki
    1981 Volume 50 Issue 11 Pages 3664-3668
    Published: November 15, 1981
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    Higher excited states (2p53p) of the atomic-type self-trapped excitons (STE) are produced by a pulsed electron beam irradiation and a subsequent laser pulse excitation in solid and liquid neon. The decay processes from these states are investigated by absorption and luminescence spectra. Luminescence corresponding to 3p→3s transitions in Ne atom and conversion of the atomic-type STE to molecular-type STE are observed. The bubble formation around the molecular-type STE is concluded from the time evolution of absorption spectra after pulsed electron irradiation.
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  • Isao Minagawa
    1981 Volume 50 Issue 11 Pages 3669-3676
    Published: November 15, 1981
    Released on J-STAGE: June 01, 2007
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    The static dielectric constant of ice Ih is calculated, considering the energy differences between the configurations of hydrogen atoms obeying the Bernal-Fowler rule, by Takagi’s method of KDP crystals in the framework of Kirkwood-Fröhlich theory. This is the study of the phase transiton with thirteen order parameters. A model of water molecule, called the tetrapod model, is proposed, which is a four-point-charge model plus an additional quadrupole moment. Considering the multipole interaction, the Curie-Weiss law is derived. With the change of the quadrupole moment, ferroelectric or antiferroelectric phase transition occurs. With suitable quadrupole moment, the experimental Curie-Weiss constant 46 K parallel to the c-axis and the observed anisotropy of the dielectric constants can both be derived, where the transition temperature to ferroelectric phase is 69 K.
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  • Shozo Sawada, Toshihisa Yamaguchi, Yoshihiro Shiroishi, Akitoshi Yamam ...
    1981 Volume 50 Issue 11 Pages 3677-3680
    Published: November 15, 1981
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    The phase transition points of ferroelectric Rb2ZnBr4 were re-examined by the DTA technique. The ferroelectric Curie temperature TC on heating was determined as −81°C. The incommensurate-normal transition point T1 is 74°C. The dielectric constants in the a, b and c directions were measured in a temperature range of −150∼120°C covering TC and Ti. The Curie-Weiss law was found to hold in the ferroelectric a direction above TC. The temperature- and applied field-dependence of the 60 Hz D-E hysteresis loop were studied in detail. The triple loop observed just below TC and the anomalous field dependence of the spontaneous polarization show the ferroelectricity in Rb2ZnBr4 would be ferrielectricity in reality.
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  • Seishi Kudo, Takuro Ikeda
    1981 Volume 50 Issue 11 Pages 3681-3687
    Published: November 15, 1981
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    Temperature dependence of birefringences and lattice strains in K2SeO4 has been investigated. They exhibit anomalies at the upper transition temperature (129.5 K), whereas no anomalies are found at the Curie temperature (93 K). Experimental results are analyzed by a phenomenological theory based on the incommensurate order parameter. Spontaneous birefringences are ascribed to the coupling with the order parameter and to the photoelastic effect through the spontaneous lattice strains.
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  • Kazushige Mori
    1981 Volume 50 Issue 11 Pages 3688-3694
    Published: November 15, 1981
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    On the basis of the effective Hamiltonian method the static properties of the transverse Ising model with substitutional disorder have been investigated. By a perturbation expansion of the density matrix the self-consistent equation for the effective field is obtained in an analytical form. The transition temperature and the susceptibility etc. are derived from the partition function and numerically calculated. It is shown that for the diluted systems this approximation gives much lower transition temperatures and higher critical concentrations than the simple ones previously derived. In the two-component system with a strong transverse field a finite critical concentration is predicted in contrast to the previous studies. The application of this approximation to the “pseudo” one-dimensional systems having weak interchain correlations is also discussed.
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  • Ryumyo Onaka, Takanori Kawamura
    1981 Volume 50 Issue 11 Pages 3695-3700
    Published: November 15, 1981
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    The refractive indices of KDP for ordinary and extraordinary rays are studied as a function of temperature for mercury lines down to 253.7 nm. A marked hysteresis is observed for the crystal cooled down below Tc. The temperature coefficient of the refractive indices in the paraelectric phase has little dependence on the wavelength. From the data obtained the refractive indices and their temperature dependence are discussed from the point of view of the electronic structure.
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  • Akiyoshi Hatayama, Yuji Koshi, Masatada Ogasawara
    1981 Volume 50 Issue 11 Pages 3701-3708
    Published: November 15, 1981
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    A set of model equations of the dissipative trapped ion instability is derived and solved numerically. Multiple time scale expansion scheme is applied to the non-linear fluid equations of Kadomtsev and Pogutse by taking μ=ω⁄νe as a small parameter, where ω is the frequency of the wave and νe is the effective collision frequency of the electrons. All the modes except for the linearly most unstable one die away due to the mode coupling. Final saturation of the mode is attributed to the modification of background trapped ion number density averaged over the poloidal direction. The coefficient of trapped ion anomalous diffusion, which scales as D∝νia2i is the effective collision frequency of the ions and a is the minor radius of a torus) is also derived.
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  • Hidehiko Sugimoto, Yuh Fukai
    1981 Volume 50 Issue 11 Pages 3709-3717
    Published: November 15, 1981
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    The energy and wave functions of the ground and excited states have been calculated for hydrogen isotopes (H and D) self-trapped on the tetrahedral (T) site in bcc metals V, Nb and Ta. Results of the calculation account well for all features of localized vibration spectra observed by inelastic neutron scattering, including the excitation energy and the relative intensity of peaks. In addition, it has been shown that the excitation energy varies sensitively with displacements of surrounding metal atoms, leading to the interpretation that the observed broadening of the peaks is caused by lattice deformation arising from lattice vibration and the presence of other H (D)-atoms.
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  • Toshihide Takagahara
    1981 Volume 50 Issue 11 Pages 3718-3724
    Published: November 15, 1981
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    Nonlinear optical methods to determine the transverse relaxation constants of excitonic molecules making use of two-photon echo and a new type of excited state photon echo are proposed. The two-photon echo is a seventh order nonlinear effect at the lowest and one needs three pulses to observe it, while the excited state photon echo is a fifth order nonlinear effect and requires four pulses. In these nonlinear optical methods we can satisfy the phase matching condition rather easily due to the large dispersion of excitonic polaritons. We can determine directly the transverse relaxation constants associated with the excitonic molecule from the correlation trace of the two-photon echo and the excited state photon echo.
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  • Kiyoshi Aoyagi, Masako Kajiura, Satoru Sugano
    1981 Volume 50 Issue 11 Pages 3725-3733
    Published: November 15, 1981
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    The absorption spectrum of a Cr3+ ion in an antiferromagnetic disprosium aluminum garnet with the Néel temperature TN of 2.5 K, is measured in the red region between 1.7 K and 4.2 K. It is shown that the fine structure of the R1 and R2 lines at 1.7 K can be explained by using an effective Hamiltonian for the t2g3 2E excited state of Cr3+ in the surrounding of the ordered Dy3+ spins. The gross feature of the observed temperature dependence of the fine structure is shown to be reproduced by assuming appropriate exchange interactions of Cr3+ with Dy3+.
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  • Mikihiko Ikezawa, Mareo Ishigame
    1981 Volume 50 Issue 11 Pages 3734-3738
    Published: November 15, 1981
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    The absorption spectrum caused by the two-phonon difference process in Si has been found in the wavenumber region from 80 to 400 cm−1. The absorption coefficient is below 0.5 cm−1 at room temperature. Peaks of the spectrum, which have been observed at 265, 313 and 381 cm−1, are attributed to the phonons at L and X points in the Brillouin zone. Owing to the high symmetry of the dispersion relation of the phonons at these points, the peaks are found in pairs with those of the two-phonon summation process of the same phonons. Peaks observed at 120 and 152 cm−1 are due to accidental singularities which occur only in the difference energy surface of two phonons.
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  • Hidenori Akiyama, Osamu Matsumoto, Susumu Takeda
    1981 Volume 50 Issue 11 Pages 3739-3743
    Published: November 15, 1981
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    The effect of the ponderomotive force on a plasma with flow is studied by controlling the velocity. The density of the plasma with flow velocity slower/faster than the ion acoustic velocity respectively decreases/increases by the ponderomotive force of the high frequency field. The density change is proportional to the square of the high frequency electric field intensity. The experimental results are compared with the theoretical ones calculated from the continuity and momentum equations, including a term of the ponderomotive force.
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  • Takashi Abe, Keishiro Niu
    1981 Volume 50 Issue 11 Pages 3744-3750
    Published: November 15, 1981
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    The plasma with stress tensor is shown to be unstable for the ion acoustic mode in addition to the electromagnetic mode. These unstable modes are saturated by nonlinear effects, and constitute steady turbulent state. The fluctuations in thus derived turbulence take a role of effective collisions for ion and electron in a plasma, and cause the anomalous viscosity. In the imploding target plasma of ICF, this anomalous mechanism becomes important at electron temperature above 10 keV, and reduces the viscosity to about 10−2 times of the classical one at Te=100 keV.
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  • Hiroki Yoshihara, Tsutomu Iwayanagi, Tosiya Taniuti
    1981 Volume 50 Issue 11 Pages 3751-3758
    Published: November 15, 1981
    Released on J-STAGE: June 01, 2007
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    The present paper deals with the nonlinear theory of the collisional drift-wave instability near the neutral stable point. It is shown that under the periodic boundary condition in the direction of the applied magnetic field, the collisional drift-wave growing linearly excites the convective-mode, that is the disturbance normal to the magnetic field, and by means of the coherent nonlinear interaction with the convective-mode, the growth is saturated at a peak level, then the drift-wave begins to decay, and ultimately damps out. The saturation level is proportional to the linear growth rate [∝(BBc)⁄Bc] in contrast to the usual one proportional to the square root of the linear growth rate such as being given by the quasi-linear theory.
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  • Hiroharu Fujita, Shinya Yagura, Eiichi Yamada
    1981 Volume 50 Issue 11 Pages 3759-3761
    Published: November 15, 1981
    Released on J-STAGE: June 01, 2007
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    An influence of a heating voltage on potential measurements by an emissive probe immersed in a plasma is studied. It is found that a peak point of the first-derivative curve of the current-voltage characteristic shifts even during the off cycle of the heating voltage with a half-wave rectified sinusoidal form. Calculations predict that this comes from a joule heating effect.
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  • Boye Ahlborn
    1981 Volume 50 Issue 11 Pages 3762-3768
    Published: November 15, 1981
    Released on J-STAGE: June 01, 2007
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    A one dimensional analytical model for simple laser shell targets with self regulated inverse bremsstrahlung absorption and tamped flow is presented for comparison with a similar model derived previously for targets with unrestricted flow. The ablation pressure for tamped flow is about an order of magnitude higher than for free flow. It does not depend on the ablation temperature and the laser wavelength and it can be influenced by the ablator density. The shock wave velocity is higher but the exhaust velocity, the exhaust Mach number, the burn velocity and the mass ablation rate are lower for the retarded flow.
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  • Hiroshi Iyetomi, Kenichi Utsumi, Setsuo Ichimaru
    1981 Volume 50 Issue 11 Pages 3769-3777
    Published: November 15, 1981
    Released on J-STAGE: June 01, 2007
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    Corrections to the thermodynamic functions of high-density hydrogen plasmas arising from the screening effects of the degenerate electron liquid are investigated through the variational method based on the Gibbs-Bogoliubov inequality. The Monte Carlo solution to the one-component plasma (OCP) systems is adopted as the reference; the screening effect is taken into account through the improved dielectric function proposed recently by Utsumi and Ichimaru. Results are compared with those obtained by Galam and Hansen on the basis of different screening functions. Relative accuracy and validity of the OCP variational methods are examined on the scales of correlation functions; it is thereby noted that the exchange and Coulombic local-field corrections between electrons introduce significant modifications to the microscopic description of high density plasmas.
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  • Hiroshi Iyetomi, Kenichi Utsumi, Setsuo Ichimaru
    1981 Volume 50 Issue 11 Pages 3778-3781
    Published: November 15, 1981
    Released on J-STAGE: June 01, 2007
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    The electric resistivity of high-density hydrogen plasma is calculated according to Ziman’s formula with the aid of the improved variational structure factor. Numerical results obtained in various approximation schemes are compared and discussed.
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  • Akira Sakurai, Tsutomu Arai
    1981 Volume 50 Issue 11 Pages 3782-3784
    Published: November 15, 1981
    Released on J-STAGE: June 01, 2007
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    Some modifications of previous results of an accuracy estimate for the M2-expansion solution to a two-dimensional, steady flow past a circular cylinder without circulation are made to result in the existence proof of a solution of Imai’s equation for the flow. This is extended to a flow past a cylinder of a more general profile with a circulation around it. Regularity of the solution is also considered.
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  • Ryogo Hirota
    1981 Volume 50 Issue 11 Pages 3785-3791
    Published: November 15, 1981
    Released on J-STAGE: June 01, 2007
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    A discrete analogue of a generalized Toda equation and its Bäcklund transformations are obtained. The equation is expressed with the bilinear form as follows
    [Z1 exp (D1)+Z2 exp (D2)+Z3 exp (D3)]f·f=0
    where Zi and Di for i=1, 2, 3, are an arbitrary parameter and a linear combination of the binary operators Dt, Dx, Dy, Dn, etc., respectively.
    The equation is very generic, namely appropriate combinations of parameters give various types of soliton equations including the Korteweg-de Vries equation, Kadomtsev-Petviashvili equation, modified KdV equation, sine-Gordon equation, nonlinear Klein-Gordon equation, Benjamin-Ono equation and various types of discrete analogues of soliton equations.
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  • Hiroyuki Nagashima, Masaaki Kuwahara
    1981 Volume 50 Issue 11 Pages 3792-3800
    Published: November 15, 1981
    Released on J-STAGE: May 29, 2007
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    Computer simulation of the nonlinear wave equation ut+uux−γ2u5x=0 was carried out. The results show that one solitary wave with oscillatory tails propagates stably and it is described as uf1⁄4(x−λt)}.
    It is found that the two-solitary wave interaction is classified into two types, T and B, according to the relative amplitudes of waves, and after type the T interaction, both identities of solitary waves before the interaction are conserved, while after type the B interaction their identities are approximately conserved.
    Formation of a two-solitary wave’s bound state is observed after three-solitary wave interaction, and the condition of the bound state formation is discussed.
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  • Susumu Kurihara
    1981 Volume 50 Issue 11 Pages 3801-3805
    Published: November 15, 1981
    Released on J-STAGE: June 01, 2007
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    Traveling wave solutions are examined for the nonlinear wave equation
    (Remark: Graphics omitted.),
    which describes the dynamics of condensate wave function ψ(x, t) in superfluid film of mean thickness d. An exact one-soliton solution is obtained analytically for arbitrary amplitude, and this suggests that the “quasi-solitons” found in the previous numerical work are stable at least in the asymptotic situation where quasi-solitons are essentially non-overlapping. It is shown explicitly that our solution reduces, in small amplitude regime, to the Korteweg-de Vries one-soliton solution.
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  • Etsuro Date, Michio Jimbo, Masaki Kashiwara, Tetsuji Miwa
    1981 Volume 50 Issue 11 Pages 3806-3812
    Published: November 15, 1981
    Released on J-STAGE: June 01, 2007
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    The hierarchy of Kadomtsev-Petvisahvili (KP) equation is studied on the basis of free fermion operators. Particular emphasis is laid on relating the operator approach to the Grassmann formulation of M. and Y. Sato. A new bilinear identity for wave functions is derived, and is shown to generate the series of Hirota bilinear equations for the KP hierarchy. Extension to the multicomponent case is also discussed.
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