Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
Volume 40, Issue 4
Displaying 1-50 of 52 articles from this issue
  • Shigeharu Kabashima, Hiroki Yamazaki, Tatsuyuki Kawakubo
    1976 Volume 40 Issue 4 Pages 921-924
    Published: April 15, 1976
    Released on J-STAGE: May 29, 2007
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    The low frequency noise and the oscillatory microwave power spectrum have been simultaneously measured on the Gunn diode in order to investigate the critical phenomenon near the threshold of the Gunn instability. In a rather wide bias range an anomalously large low frequency noise and a noisy power spectrum are observed. The appearance of a wide critical region is discussed with the use of an equation for the negative-resistance oscillator.
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  • Tsuneharu Takeda, Hidetoshi Fukuyama
    1976 Volume 40 Issue 4 Pages 925-932
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    The temperature dependence of the surface magnetization is calculated in the mean field approximation for the (1, 0, 0) surface of the face-centered-cubic (f.c.c.) crystal with the nearest and the next nearest neighbor exchange interactions. It is assumed that the spin magnitudes and exchange interactions are not changed near the surface. Based on the exact numerical calculations, the validity of the surface sheet model (SSM) is shown, where the spatial variation is assumed only between the surface and the second layers.
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  • Tôru Moriya
    1976 Volume 40 Issue 4 Pages 933-946
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    The dynamical susceptibilities of itinerant electron ferromagnets above TC are treated by taking account of the coupling among the spin fluctuation modes to a greater extent than was made before and the relatively short wave components are shown to have characteristics of spin waves which are suppressed significantly on crossing the spin fluctuation-induced Stoner excitation boundary. In the long wave limit the theory reproduces the self-consistently renormalized spin fluctuation theory of Moriya and Kawabata.
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  • Darci Motta de Souza Esquivel, Amando Siuiti Ito, Sadao Isotani
    1976 Volume 40 Issue 4 Pages 947-954
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    Crystals of Na4[(Fe EDTA)2O]12H2O were investigated by means of electron paramagnetic resonance (EPR) spectroscopy. The spectra were obtained at various temperatures and crystals orientations. These spectra are very complex and have many absorption bands.
    The antiferromagnetic coupling between the iron atoms in the bridge Fe–O–Fe gives rise to states with total spin quantum number S=0, 1, 2, 3, 4, and 5. Analyses of the EPR spectra as a function of temperature permitted the identification of the EPR absorption lines. They were found to be due to the state with S=2. It was also possible to evaluate the exchange parameter as J\simeq202±10 cm−1.
    From the study of the angular dependence of the absorption lines it was found that the magnetic axes X, Y, Z and the trial crystal axes a, b, c are related with a precision of 5°, by
    (a, b, c)=(Y, Z, X)
    for positive E. For negative E, axes X and Y are interchanged. Also the crystal field parameters were found to be
    |D|=0.21±0.02 cm−1
    |E|=0.015±0.005 cm−1.
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  • Hiroshi Konno
    1976 Volume 40 Issue 4 Pages 955-961
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    Oblique incidence anisotropy in Ni–Fe evaporated films are investigated as a function of the substrate temperature Ts in the range from 30 to 250°C. For the observation of the anisotropy, the magnetic resonance is utilized. For Ts<70°C, the axis of easy magnetization is directed nearly to the incidence direction; as increasing Ts, it turns to the film normal (83, 90% Ni), or to the plane of film (75% Ni). The effective saturation magnetization Ms* is about 0.6 of the bulk value, then increases as increasing Ts, and Ts>200°C, it is almost equal to the bulk value. From the results it is concluded that the anisotropy due to the columnar grain structure Kcol is mainly responsible for Ts<70°C, but scarcely responsible for Ts>200°C. The anisotropy due to the magnetoelastic effect Kmagel can be distinguished from Kcol, and it is shown that Kmagel is directly corresponds to the magnetostriction constant of the film.
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  • Akio Mishima, Hironobu Fujii, Tetsuhiko Okamoto
    1976 Volume 40 Issue 4 Pages 962-967
    Published: April 15, 1976
    Released on J-STAGE: May 29, 2007
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    The saturation magnetostriction of gadolinium single crystal has been measured from 4.2 K to 330 K, above the Curie temperature, by a strain gauge technique. The anomalous saturation magnetostrictions along the c- and a-axes in the ac plane were observed at low temperatures. These anomalies are explained by the higher order terms of the magnetostriction constants.
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  • Toshihiro Idogaki, Izuru Kimura
    1976 Volume 40 Issue 4 Pages 968-973
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    A theoretical study is made of the magnetic properties of antiferrimagnet using the molecular field approximation. The study is mostly limited to the effects of the presence of two kinds of magnetic ions. It is shown that the effects yield some characteristic behaviors in various magnetic properties of antiferrimagnet: sublattice magnetization, magnetic susceptibility and magnetic specific heat.
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  • Masahiko Sakoh, Masao Shimizu
    1976 Volume 40 Issue 4 Pages 974-980
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    The electronic structure and magnetic properties of a half-filled Hubbard band in the paramagnetic state are studied by means of the functional integral method with the static approximation. The fluctuation of random magnetic fields is taken into account. Temperature variations of the distribution function of random field, density of states, free energy and static spin susceptibility χ(T) are numerically calculated. No sharp metal-insulator transition is found. In the metallic state, an increase of thermal fluctuations of random magnetic fields associated with a gradual phase transition between the states with and without localized moments is found. It is shown that this increase yields a slight bend in the temperature variation of χ(T)−1.
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  • Munetaka Haida, Kay Kohn
    1976 Volume 40 Issue 4 Pages 981-985
    Published: April 15, 1976
    Released on J-STAGE: May 29, 2007
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    Magnetic torque of KFeF3 single crystals have been measured between 4.2 and 120 K. Weak ferromagnetism with the easy direction along the [1\bar10] was observed below the low temperature transition at 41 K. From phenomenological treatment it was suggested that the symmetry of a KFeF3 crystal below 41 K is monoclinic. The features of the observed torque curves were interpreted on the assumption that the twin walls can be driven by applied magnetic field.
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  • Akira Ohsawa, Yasuo Yamaguchi, Hiroshi Watanabe, Hiroki Itoh
    1976 Volume 40 Issue 4 Pages 986-991
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    The magnetic form factor of CoS2 has been determined for 27 Bragg reflections by means of the polarized neutron diffraction technique. Fourier transform of the observed data shows that the magnetic moment is localized on cobalt atoms, and the moment distribution is aspherical around cobalt nuclei, and there is almost no magnetic moment delocalized in the region between cobalt atoms. The measured magnetic form factor agrees well with the calculated free ion form factor for Co2+. The comparison between calculated and measured magnetic form factors shows that the magnetic moment delocalized in the region between cobalt atoms is very small, 0.013±0.024B/CoS2), compared with those in ferromagnetic 3d-transition metals. It shows further that 69±4% of the unpaired 3d electrons occupy eg orbitals on the basis of the point charge model for the cubic crystalline field.
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  • Akira Ohsawa, Yasuo Yamaguchi, Hiroshi Watanabe, Hiroki Itoh
    1976 Volume 40 Issue 4 Pages 992-995
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    Direct observation of a small magnetic moment distributed around sulfur atoms in CoS2 has been made by means of polarized neutron diffraction technique. The observed data are analyzed on the basis of the theory by Hubbard and Marshall. The analysis shows that the observed magnetic moment distribution is aspherical around sulfur nuclei, and it can be interpreted in terms of asphericity of atomic 3p orbital for S free ion. The magnetic moment may be considered to result from a covalent bonding effect between 3d-eg orbitals of cobalt atoms and 3pπ orbitals of sulfur atoms. Here, 3pπ orbitals point perpendicular to the axis of S2 molecule which consists of sulfur atoms in CoS2.
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  • Kenji Sumiyama, Masayuki Shiga, Yoji Nakamura
    1976 Volume 40 Issue 4 Pages 996-1001
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    In order to clarify the effect of concentration fluctuation on the Invar effect, the temperature dependences of magnetization and thermal expansion and the low temperature specific heat of the Fe72Pt28 alloy were measured in both the ordered and disordered states. The thermal expansion anomaly, which is the most essential Invar effect, was observed in both states of the alloy. This anomaly is more remarkable in the disordered state than in the ordered state, particularly around TC. This different behavior can be attributable to the difference in the magnetization versus temperature curve; the magnetization of the disordered alloy decreases more rapidly around TC. The spontaneous volume magnetostriction at 0 K were estimated for the ordered and disordered states as 1.4×10−2 and 1.6×10−2, respectively. These phenomena can not be explained by the proposed models for the Invar effect based on the inhomogeneity or the fluctuation of composition.
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  • Kenji Sumiyama, Masayuki Shiga, Kunihiko Tachi, Yoji Nakamura
    1976 Volume 40 Issue 4 Pages 1002-1006
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    The Mössbauer effect of Fe57 and NMR of Pt195 were measured for both the ordered and disordered states of the Fe72Pt28 Invar alloy. The differences in Mössbauer and NMR spectra between both states are explainable by taking into account of the different configurations of atomic arrangement at near neighbor sites. No indication of the coexistence of two magnetic phases, which has been considered as an essential origin of several anomalous behaviors of the Fe–Ni Invar alloy, was given in the Mössbauer and NMR spectra.
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  • Shinji Ogawa
    1976 Volume 40 Issue 4 Pages 1007-1009
    Published: April 15, 1976
    Released on J-STAGE: May 29, 2007
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    Electrical resistivity of ZrZn2 has been measured between 1.5 and 300 K. The resistivity shows a T2 dependence with a coefficient 4.7×10−8 Ω-cm/K2 below about 20 K, a T2⁄3 dependence above a Curie point of 21 K up to about 50 K, and a dependence on temperature less rapid than T1 above about 100 K, in good agreement with the result of a recent theory by Ueda and Moriya. The resistivity shows a slight change of slope at the Curie point.
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  • Hiroshi Fujiwara, Hideoki Kadomatsu, Kazuo Ohishi, Yoshiaki Yamamoto
    1976 Volume 40 Issue 4 Pages 1010-1016
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    Hydrostatic pressure effects on the Curie temperature ΔTcΔp, have been investigated for Ni-based alloys, Ni–V, –Cu, –Pd, –Pt and –Rh, over a wide composition range. The Curie temperature was determined as an inflection point of self-inductance vs temperature curve. For all the alloys, ΔTcΔp’s decrease monotonically accompanying with a change in sign as solute concentration increases. ΔTcΔp’s as a function of Tc are classified into two types. The data on Ni–V, –Cu and –Pd alloys almost lie on a line and rather rapid decrease in a concave downward curve has been obtained for Ni–Pt and –Rh alloys. It is concluded from qualitative arguments that the d-band widening with pressure almost counterbalances with compression-induced s-d transfer for the former type and the widening overcomes the transfer effect for the latter type.
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  • Yoichi Kadota, Yoshihiro Ishibashi, Yutaka Takagi
    1976 Volume 40 Issue 4 Pages 1017-1020
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    All the elastic constants in Cd3Mg and Cd2Mg were measured at room temperature by using ultrasonic technique. The temperature dependences of c11 and c33 were also measured in the ordered phase as well as in the disordered phase. The results are compared with those so far reported for crystals with different compositions.
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  • Akira Nagasawa
    1976 Volume 40 Issue 4 Pages 1021-1026
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    Electron diffraction study on the formation of the 9R type martensite in AgCd shows that the martensitic phase transition proceeds through the successive two processes. The first process is the symmetry change due to very small lattice distortion in the β2 phase domains, which have characteristics of the embryos of the martensites. The close packed layers are not yet formed at this stage. This process can be caused from softening of a phonon mode localized in the β2 phase domains. The second process is the change of the distorted lattice to the 9R type martensite without any symmetry change. Based on the results, nature of the martensitic transition in the β phase alloys is considered and a general model of the transition is presented.
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  • Katsukuni Yoshida
    1976 Volume 40 Issue 4 Pages 1027-1034
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    A transport phenomenon for the inhomogeneous current distribution in semimetals has been considered in terms of geometry of the current trajectory and the equipotential line under the influence of high magnetic fields. When a magnetic field is applied, the current distribution varies through the magnetoresistance effect. In this case, a potential mountain or valley appears on a specimen side-surface, owing to the high current density along a geometrical line parallel to the magnetic field vector. These mountain and valley can move along the specimen surface, according to the rotation of magnetic field direction. Results derived from the model are compared with experimental data obtained for bismuth and antimony.
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  • Michio Kiritani
    1976 Volume 40 Issue 4 Pages 1035-1042
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    Effects of electron radiation on the displacement of point defects in metals are evaluated with various conceivable models. The collision cross-section to transfer the energy required for the displacement is calculated. The effect of large energy recoil is taken into consideration. Synergestic effect with the thermal vibration is estimated to be small. Electron energy dependence is evaluated to find the maximum effect by the medium energy electrons. The effect is in general larger for heavier elements and also larger for the point defects with smaller migration activation energy when compared within the same kind of point defects. The number of jumps of both vacancies and interstitial atoms under normal operating conditions of an electron microscope is in the order of 1∼10 jumps/sec. The influence of the effect on the already published results on point defect natures derived from electron irradiation experiments by high voltage electron microscopy is discussed.
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  • Shinya Wakoh, Yasunori Kubo, Jiro Yamashita
    1976 Volume 40 Issue 4 Pages 1043-1047
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    The Compton profiles due to the band electrons in vanadium and chromium are calculated from the wave functions obtained by APM method. The results are compared with other theoretical works and available experiments. The observed structures on the Compton profiles are well interpreted from the band theoretical point of view.
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  • Toshihiro Terada
    1976 Volume 40 Issue 4 Pages 1048-1055
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    A phosphorus-doped layer was implanted at room temperature in zinc selenide wafers with an ion dose of 5×1015 cm−2 at 180 kV, in which the wafers are fixed on the target to make their (110) faces normal to the incident beam. The impurity levels of phosphorus substituting for selenium have been determined by the photo-conductivity and photo-luminescence measurements; they are located at energies of εP\simeq0.11 eV and εP′∼0.36 eV above the valence band at about 100 K (the εP′ level is affected by the copper impurity; εn∼0.32 eV, contained natively in crystals). The measurements have revealed that the εP level is the origin of the blue emission-center. This study has also shown that crystalline materials should be tightly fixed to the target, to establish a low-resistance electrical contact with it, for implanting the doped layer which arranges the ionimplanted atoms in the positions specified to make the lowest energy of the system for the arrangement.
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  • S. K. Sharma, S. P. Singh
    1976 Volume 40 Issue 4 Pages 1056-1061
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    Using the collision model recently suggested by Sharma and Kaw for energy-dependent relaxation times, we solve the Boltzmann transport equation for the anisotropic part of the distribution function in the presence of an acoustic wave and a dc field of arbitrary strength and calculate the absorption coefficient in a nondegenerate semiconductor. The scattering of electron with acoustic phonon has been taken as the sole mechanism of scattering. The effect of the dc field on the isotropic part has been taken into account by using Yamashita and Watanabe’s distribution. Our results show that for ql<<1 the values of the absorption coefficient are appreciably different from those obtained by using the well-known Cohen-Harrison-Harrison model while for ql>>1, no significant difference is observed in the values of the absorption coefficient obtained from the two models of the collision term.
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  • Teruo Komatsu, Yozo Kaifu
    1976 Volume 40 Issue 4 Pages 1062-1068
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    The reflection spectra of BiIs single crystals were measured between 1.5 and 5.5 eV at 6, 77 and 286 K. A Kramers-Kronig dispersion analysis of the data was made, and the intrinsic absorption coefficient and the real and imaginary parts of the dielectric constants were calculated. The large peak at 2.0 eV is ascribed to direct excitonic transition near the fundamental absorption edge. The main features observed in the absorption spectra are discussed in terms of two proposed models for anionic and cationic excitons in heavy metal halides. Measurements have also been made on the ordinary refractive index near the absorption edge. The data are well described by a two-oscillator model.
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  • Kiyofumi Muro, Yosio Nishida
    1976 Volume 40 Issue 4 Pages 1069-1077
    Published: April 15, 1976
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    The properties of photo-generated carriers in pure germanium have been studied by means of magneto-absorptions of far-infrared laser radiations. Remarkable variations of the spectra with temperature are ascribed to the phase transition of free excitons into electron hole drops (EHD). An attempt has been made to establish a correspondence between the exciton Zeeman lines and the cyclotron resonance lines in the quantum limit on the basis of an adiabatic picture for the Coulomb interaction. Resonance effects of EHD are discussed using Mie’s theory and compared with observed results. A non-resonant oscillation of the EHD absorption against magnetic field has been observed, which allows us to estimate the equilibrium carrier density of EHD.
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  • Masao Kamada, Riso Kato
    1976 Volume 40 Issue 4 Pages 1078-1085
    Published: April 15, 1976
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    New phonon side bands have been found on the lower energy side of the zero-phonon line of 1A11B1 absorption in NaNO2. The absorption intensities of the side bands increase exponentially with temperature. They are interpreted as the hot bands which correspond to the exciton creation and phonon annihilation processes. The profile of the hot band of each polarization is discussed in comparison with that of the phonon side band on the higher energy side of the zero-phonon line. The observed profiles of the E⁄⁄a and E⁄⁄c hot bands agree with those calculated from the profiles of the higher energy side bands by taking account of the thermal population of phonons. The observed profile of the E⁄⁄b hot band is quite different from the calculated one. The difference is interpreted in terms of the exciton-phonon bound state.
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  • Tadao Kasuya
    1976 Volume 40 Issue 4 Pages 1086-1087
    Published: April 15, 1976
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    The usual analysis of the de Haas-van Alphen effect is extended to the case in which the extremal area of the Fermi surface changes with the effective field B. It is shown that the extremal area is not obtained from the derivative of the curve in the B−1n plane, in which n is the number of the Landau level, but given by nB.
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  • Masayoshi Ohbayashi, Takemi Komatsubara, Eiji Hirahara
    1976 Volume 40 Issue 4 Pages 1088-1094
    Published: April 15, 1976
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    This paper is the first report on the experimental study of the de Haas-van Alphen (dHvA) effect in a magnetic compound. The dHvA oscillations in manganese phosphide are observed by low-frequency field-modulation techniques in the magnetic fields (H) applied along the c and b axes up to 94 kOe and at temperatures down to 1.1 K. The extremal area is determined as 3.23×10−2 a.u. in the paramagnetic phase in the region of H=50∼94 kOe along the c axis. In the field along the b axis, the well-defined dHvA oscillations are observed in the paramagnetic phase in the region of H=40∼70 kOe and the extremal area is determined as 9.05×10−3 a.u., and various abnormal oscillations are observed in the fan phase in the region of H=9∼37 kOe and it is concluded that the extremal area in the fan phase varies with the external magnetic field.
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  • Syuso Fujii, Yasutada Uemura
    1976 Volume 40 Issue 4 Pages 1095-1102
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    Jump rate of an interstitial atom is calculated quantum-mechanically in a model crystal which is made of a linear chain of diatomic molecules. Normal modes of the system are exactly determined in order to investigate effects of perturbed lattice vibrations on diffusion processes. These modes play distinct roles depending on their symmetry under reflection about a site of the diffusing atom. At high temperature the rate has two types of activation energy whose physical origins are quite different. If the mass of the atom is sufficiently light, the rate shows strong deviations from the ordinary Arrhenius formula.
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  • Teizo Tabata, Hirotaro Mori, Hiroshi Fujita, Isao Ishikawa
    1976 Volume 40 Issue 4 Pages 1103-1111
    Published: April 15, 1976
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    At an early stage of deformation, only one slip system is activated in local region, and very straight screw dislocations are dominant as a whole. These screw dislocations move slowly and make cross-slip frequently. On the other hand, the edge dislocations move flexibly with high speed and escape out from the specimen as soon as they are multiplied from the dislocation sources. As the plastic deformation proceeds, two families of slip systems are activated considerably even in the localized regions, and cross grids of screw dislocations are formed all over the specimen. Each of these composite dislocations move slowly and the spacing of dislocations decreases with increasing strain. After that, dislocation tangles are frequently formed in the cross grids of dislocations by group of moving dislocations.
    These data are compared with those in the specimens with [110] tensile axis, and deformation mechanism of tungsten was discussed.
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  • Helmut Oppolzer, Peter Skalicky
    1976 Volume 40 Issue 4 Pages 1112-1117
    Published: April 15, 1976
    Released on J-STAGE: May 29, 2007
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    In reference to the work of Hashimoto and Marukawa the complex patterns which are produced by the electron diffraction contrast of overlapping stacking faults are investigated further, especially including absorption.
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  • Kunio Wakamura, Toshihiro Arai, Keiei Kudo
    1976 Volume 40 Issue 4 Pages 1118-1121
    Published: April 15, 1976
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    The lattice vibrations in CdxZn1−xCr2Se4 crystals have been studied by measuring the reflection at normal incidence in the region of wave number above 30 cm−1. Four reststrahlen bands were observed over all composition range, and the positions and the intensities of these bands vary with the composition. The behaviours of these variations show a characteristic of one-mode type. The transverse mode frequencies are calculated from the classical dispersion theory. The composition dependences of those transverse mode frequencies can be explained with a virtual crystal model which includes two kinds of units: a mass and force constants are varied monotonically with the fractional amount of Cd ion in the mixed crystal. The frequencies of the longitudinal modes are also calculated. The condition for the appearance of the one-mode or two-mode type is shortly discussed.
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  • Yutaka Kano
    1976 Volume 40 Issue 4 Pages 1122-1129
    Published: April 15, 1976
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    The electromagnetic correlation tensors of second order is calculated for a superposition of a single coherent mode and blackbody radiation, using Glauber’s formula for the density operator of superimposed multi-mode fields. In order to investigate the temporal coherence of this particular radiation, upon restricting to the electric correlation tensors, the complex degree of coherence is evaluated at various temperatures of blackbody radiation. The results are shown in several figures. For comparison the complex degree of coherence of blackbody radiation is also shown in the figure.
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  • Kiyoshi Mishima, Osamu Sugano
    1976 Volume 40 Issue 4 Pages 1130-1136
    Published: April 15, 1976
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    The effect of uni- and divalent cations on lecithin dispersion is investigated by the method of light scattering. It is shown that the translational diffusion constants of lecithin vesicles change critically at a salt concentration and equivalent Stokes radii of the vesicles which are assumed as spheres increase. It may be considered that the critical increase of Stokes radii of vesicles is related to the transition of the lecithin molecules from liquid like structure to liquid crystalline or to the change from elastic vesicles to rigid vesicles. When univalent cations were added gradually, the critical concentration remove about 20 mM higher than the case of rapid mixing.
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  • Toshizo Shirai, Kaoru Iguchi, Tsutomu Watanabe
    1976 Volume 40 Issue 4 Pages 1137-1144
    Published: April 15, 1976
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    The impact-parameter method is applied to the hydrogen transfer reaction which has a similarity to resonant charge-transfer processes, due to the fact that mass ratio of H and I is fairly small. The cases for the four combinations (with or without taking account of the momentum transfer; either rectilinear and or curvilinear trajectories) are studied and compared. A (6–12) Lennard-Jones type potential is assumed to determine the curvilinear trajectory of the incident particle. A binding potential between H and I is assumed to be a Morse type. The calculated total cross section shows an undulating structure as a function of the incident velocity, similar to the glory effect, which is discussed in detail. The calculated reaction rate constants at room temperature are about 7×1012 cc mol−1 sec−1 in the four cases. From our calculation, it appears that the momentum transfer effect is important and that the important contribution to the reaction rate comes from the cases where three atoms are in the collision plane. Discussion for the validity of Eyring’s theory in these physical situation is also given.
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  • G. C. Chikkur, N. Umakantha
    1976 Volume 40 Issue 4 Pages 1145-1149
    Published: April 15, 1976
    Released on J-STAGE: May 29, 2007
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    The absorption spectra of two new indoles, 2-carbethoxy-4-aminoindole and 2-carbethoxy-5-chloro-7-aminoindole are studied in non-polar, polar, dilute and concentrated acidic solvents. The nature of the electronic transitions are identified. The role of substitution groups and the effect of protonation are discussed in interpreting the solvent effects.
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  • Kazuo Kawahata, Masami Fujiwara
    1976 Volume 40 Issue 4 Pages 1150-1156
    Published: April 15, 1976
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    Dependences of plasma transport on the rotational transform angle and the shear as well as the plasma parameters are studied using JIPP Ib stellarator which is equipped with both l=2 and l=3 helical windings. The properties of the resonant losses observed in the afterglow plasmas in the rational cases of the l=2 stellarator field are investigated and the shear effect on the resonant losses is examined by superposing the l=3 helical field. It is found that the plasma loss is due to the onset of dissipative drift instability. The observed properties of the fluctuations such as the frequency, the wave propagation etc. can be explained by the instability. The introduction of weak shear (shear length Ls∼300 cm) reduces the resonant loss in our experimental conditions.
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  • Keiichiro Yamagiwa, Yoshikazu Toyooka, Shoji Kojima
    1976 Volume 40 Issue 4 Pages 1157-1163
    Published: April 15, 1976
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    An ion energy increment by externally excited ion acoustic waves has been studied in a simple double plasma device. The energy increment was measurd in detail by means of a small electrostatic energy analyzer whose resolving power was better than 0.1 eV. A small energy increment of about 10% was observed under the condition where ion fluctuations caused by the wave fields were less than 10% and the ratio of the electron-to-ion temperature was about 10. The measured energy increment was approximately proportional to the wave frequency and to the square of the wave potential. The fact is well understood if the wave energy is transferred to the ions through the Landau damping. The electron energy increment, however, was negligible in accordance with the above interpretation.
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  • Takashi Yabe, Keishiro Niu
    1976 Volume 40 Issue 4 Pages 1164-1170
    Published: April 15, 1976
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    The dynamical stability of the implosion of a laser-driven pellet is investigated by using the linearized three-dimensional and nonlinear two-dimensional hydrodynamic equations. In these calculations, the following conclusions are obtained; 1) the growth rate of a perturbation is very sensitive to the way how the laser energy is supplied in time into the pellet; 2) the region where the perturbation has a positive growth rate varies with the wave length of the perturbation; 3) the growth of a perturbation is sensitive to the pellet structure; and 4) nonlinear mechanisms have a tendency to stabilize the perturbations.
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  • Masakazu Katagiri
    1976 Volume 40 Issue 4 Pages 1171-1177
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    The two-dimensional unsteady flow of an incompressible viscous fluid around a circular cylinder, which is started impulsively from rest, is considered. Numerical solutions of unsteady boundary-layer equation are sought by employing the local non-similarity solution method presented by Sparrow, Quack and Boerner (Amer. Inst. Aero. Astronaut. J. 8 (1970) 1936), together with the difference-differential method. Numerical solutions are given for the velocity profile, wall shear and the time when the separation of the boundary layer occurs; the development of the boundary layer and its separation are discussed.
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  • Toyoko Minota, Terutosi Murakami
    1976 Volume 40 Issue 4 Pages 1178-1185
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    By the moment method for the Boltzmann equation with a collision term between particle and gas molecules, the normal shock wave structures are investigated without any assumptions on initial gas jump conditions, and on the particle drag and heat transfer coefficient. In the profiles for high gas Mach number, a sudden transition from frozen to relaxation region is found. For low Mach number and small particle size, such a transition disappears, and the shock wave is dispersed. The particle drag and heat transfer rate are calculated within the shock transition process. There are two types of transport of momentum and energy, i.e., the one is the Stokes type, and the other is not.
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  • Syozo Kubo
    1976 Volume 40 Issue 4 Pages 1186-1192
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    A linearized problem of a steady one-dimensional slow flow of a grey inviscid non-heat conducting gas past a grey semitransparent heat source is analyzed by method of matched asymptotic expansions when the magnitude of heat transfer due to radiation is much greater than that due to convection. The radiation field is assumed to be in LTE and to affect the flow only through the heat flux. It is found that the flow field consists of three parts: asymptotic region with diffusive heat flux, intermediate region where the exact radiative transfer equation should be considered and matching region in the neighbourhood of the heat source where the solution in the up- and down-stream should match with each other. Analytical solutions are obtained in these regions up to the second approximation correct to the order of the inverse of the Boltzmann number.
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  • Ryuji Takaki
    1976 Volume 40 Issue 4 Pages 1193-1198
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    Effect of a plane boundary on the drag and the side force has been investigated by measuring the velocity of the sphere moving in the liquid paraffin along the boundary which is inclined slightly from the vertical. The distance between the sphere and the boundary has been measured by taking a photograph of the sphere and its image with respect to the boundary. Experimental values of the drag coefficient are compared with theoretical ones by Faxén and O’Neill, and good agreement is obtained. As for the side force, the agreement is good in qualitative nature.
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  • Kenzo Sato
    1976 Volume 40 Issue 4 Pages 1199-1206
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    The paper is concerned with the forced vibration of a composite elliptical membrane consisting of confocal elliptical parts of different materials. The analysis uses Mathieu functions and the Laplace transformation method.
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  • Toshihiro Okada, Shigeharu Kabasima, Shigeru Kogure, Masatoshi Shiino
    1976 Volume 40 Issue 4 Pages 1207B
    Published: April 15, 1976
    Released on J-STAGE: May 29, 2007
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  • Masakatsu Umehara, Tadao Kasuya
    1976 Volume 40 Issue 4 Pages 1207A
    Published: April 15, 1976
    Released on J-STAGE: May 29, 2007
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  • Kazukiyo Nagata
    1976 Volume 40 Issue 4 Pages 1209-1210
    Published: April 15, 1976
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    The temperature dependence of the EPR frequency is calculated for antiferromagnets with inequivalent g-tensors. Contrary to the previous results for the systems with isotropic g-factor, the EPR frequency increases rapidly for every orientations of the magnetic field as the temperature is reduced. The observed temperature dependence of the resonance fields in several copper salts is discussed by use of this result.
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  • Tadashi Sugihara, Masanori Abe, Takashi Katsura
    1976 Volume 40 Issue 4 Pages 1211-1212
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    Magnetic and Mössbauer measurements were done between 77 and 300 K on polycrystalline sample of YFe2O4 (Y3+Fe2+Fe3+O42−). This compound shows an “induced parastic ferromagnetism”: Weak ferromagnetic moment (∼2 emu/g) was induced below 240 K by applying external field (∼7 kOe) and an uniaxial anisotropy was induced by cooling the sample from 300 K to 77 K in the presence of external field. Mössbauer spectrum of Fe57 showed a magnetic pattern with internal field of ca. 460 kOe at 90 K, and showed a paramagnetic one at 300 K.
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  • Ikuo Ono
    1976 Volume 40 Issue 4 Pages 1213-1214
    Published: April 15, 1976
    Released on J-STAGE: May 29, 2007
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    A possibility of cooling by an adiabatic magnetization in a magnetic field is considered. A simple Ising antiferromagnet consisting of two sublattice is proved to exhibit the cooling around the critical field between antiferromagnetic and ferromagnetic spin ordering. It is shown that the drop of temperature depends not only on the starting temperature at zero field, but also sensitively on the magnitude of ferromagnetic intra-sublattice interactions. For a model standing for CoCl2·2H2O the temperature change is also calculated and compared with the observation by Kuramitsu et al.
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  • Izumi Hirabayashi, Takao Koda, Yoshinori Tokura, Jun Murata, Yoshio Ka ...
    1976 Volume 40 Issue 4 Pages 1215-1216
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    The surface exciton-polariton is detected, for the first time, in the attenuated total reflection (ATR) spectra of CuBr film at 77 K. The observed features of the ATR spectra and the experimental dispersion of the surface mode are well accounted for in terms of the local dielectric response function of the exciton in CuBr.
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  • Toshihiko Dote, Yukimi Ichikawa
    1976 Volume 40 Issue 4 Pages 1217-1218
    Published: April 15, 1976
    Released on J-STAGE: June 01, 2007
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    The electron temperature was calculated by renewed theory in the cylindrical positive column using the boundary velocity of charged particles defined by Friedman, et al. This theory is extended to cases involving the effect of metastable atoms’ ionization and of a binarymixtured gas. The electron temperature calculated based upon this theory give characteristics valid from lower to higher pressure ranges. For example, the calculations were carried out for Ne and He gases, which results may be useful for an investigation of the He–Ne laser plasmas.
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