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- Proceedings of the Physico-Mathematical Society of Japan. 3rd Series
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- Tokyo Sugaku-Butsurigakukwai Kiji-Gaiyo
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Volume 50, Issue 10
Displaying 1-50 of 55 articles from this issue
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Yoshiro Kakehashi1981 Volume 50 Issue 10 Pages 3177-3178
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA new theory which unifies both the glass-like phase proposed by Jo on the basis of the HF–CPA and that in the site Ising model is presented. The theory includes the former at T=0, and the decrease of the magnetization in its state is proportional to T at low temperatures in the single site approximation. The freezing temperature Tg agrees with that of the molecular-field approximation in the site Ising model.View full abstractDownload PDF (272K) -
Kazuhiko Yamashita1981 Volume 50 Issue 10 Pages 3179-3180
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA new formula for the maximum dc Josephson current Js(T) of asymmetrical junction is derived, taking account of the effect of self-induced field due to the persistent current in terms of the boson theory. The formula can explain the temperature dependence of Js(T) observed in the thin film junctions which show the considerable deviation from the prediction of the Ambegaokar-Baratoff theory. Good agreements are obtained by using the appropriate values of the film thicknesses, the London penetration depths and Ginzburg-Landau parameters of the films, used in the experiments. Comparisons with proximity-effect junctions are also reported.View full abstractDownload PDF (312K) -
Kiichi Amaya, Yoshitomo Karaki, Norikatsu Yamada, Taiichiro Haseda1981 Volume 50 Issue 10 Pages 3181-3182
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSpin ordering among excited levels in NaNi Acac3·benzene is observed in the course of pulsed adiabatic magnetization with sweep rate of 105 T/sec. For initial temperatures below 1 K, dM⁄dt signals give the characteristic double peaks around the field of 2.11 T where the excited singlet and the upper state of the ground doublet crosses.View full abstractDownload PDF (220K) -
Toshihiko Tokunaga, Hideoki Kadomatsu, Hiroshi Fujiwara1981 Volume 50 Issue 10 Pages 3183-3184
Published: October 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe magnetocrystalline anisotropy energy of Ni–Mn alloys containing 0∼16 at% Mn has been measured in the temperature range between 4.2 K and 300 K. The concentration dependence at 4.2 K was monotonical decrease in the exponential form with Mn. The rate of decrease with temperature for the alloys was almost the same as that for Ni.View full abstractDownload PDF (240K) -
Kazuo Gesi1981 Volume 50 Issue 10 Pages 3185-3186
Published: October 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSDielectric constants of pseudo-hexagonal c-plates of Rb3H(SeO4)2 and Rb3D(SeO4)2 were measured below room temperature. The dielectric constant of Rb3H(SeO4)2 monotonically increases with decreasing temperature down to liquid helium temperature. On the other hand, that of Rb3D(SeO4)2 shows a λ-type maximum at 92 K indicating that there is a phase transition induced by deuteration.View full abstractDownload PDF (204K) -
Masaru Komukae, Toshio Osaka, Yasuharu Makita, Tohru Ozaki, Kazuyuki I ...1981 Volume 50 Issue 10 Pages 3187-3188
Published: October 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe dielectric constants and the specific heat of CsHSO4 are measured from −190°C to 170°C. It is found that CsHSO4 undergoes phase transitions at about 100°C and 140°C. The transition entropy is 0.35 J·mol−1·deg−1 for the 100°C transition and 11.0 J·mol−1·mol−1 for the 140°C transition.View full abstractDownload PDF (228K) -
Bin Okai1981 Volume 50 Issue 10 Pages 3189-3190
Published: October 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSRubidium and potassium halides (RbX and KX; X=F, Cl, Br and I except for RbF) retain preferred orientation of (100)(B2)//(111)(B1) and (111)/(B2)//(100)(B1) at the phase transition from B1 to B2-type structure under pressure. Geometry is shown for the movements of lattice points which are compatible with the orientation relation.View full abstractDownload PDF (224K) -
Takeki Iwashita1981 Volume 50 Issue 10 Pages 3191-3197
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTime-integral and time-differential gamma-gamma directional correlation measurements were performed for cascades in 168Er populated from the decay of 168Tm (90d.). The mixing parameters of most of the intense gamma-rays have been determined more precisely than ever. Some ambiguities concerning to the directional correlation coefficients of the 447–198 keV and 447–830 keV cascades were well removed. The directional correlation coefficients of these cascades were determined as A22=0.009±0.003 and −0.067±0.008, respectively, and A44≈0 for both. The mixing parameters of the 198-, 447- and 830-keV gamma-rays were determined as δ(198)=0.13±0.02, δ(447)=0.09±0.01 and δ(830)=0.05±0.03, respectively. The transition probabilities of the gamma-rays deexciting the 1094-keV level are deduced on the basis of this work.View full abstractDownload PDF (852K) -
Takashi Fujisawa, Norio Kishida, Toshiyuki Kubo, Takeshi Wada, Yoshiyu ...1981 Volume 50 Issue 10 Pages 3198-3206
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe difference between the analyzing power (A) and polarization (P) in the inelastic scattering of protons on 12C (4.44 MeV 2+ state) are determined by measuring the spin flip probability of polarized protons at intervals of incident energy of about 0.5 MeV at lab. scattering angles of 45°, 60°, 75°, 105°, 120°, 135° and 150°. The spin flip asymmetry (SFA), spin flip probability (SF) and A are also measured. The angular distributions of SF, SFA, A, (A–P) and partial differential cross sections are investigated at 24.1, 26.2 and 28.7 MeV at intervals of lab. angle of 7.5° or 15°. The (A–P) and SFA show pronounced interferencelike energy dependence and the (A–P) has large values of more than 50% at 135° and 150° for 26.2 MeV. The measurement was done by using the (p, p′γ) coindidence technique developed by Schmidt.View full abstractDownload PDF (1036K) -
Koji Muramatsu1981 Volume 50 Issue 10 Pages 3207-3214
Published: October 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe spin-flop paramagnetic phase transition of the Heisenberg antiferromagnet in the limit of zero anisotropy is studied by a Green function theory in the random phase approximation for S=1⁄2 and by a spin wave theory including spin wave interactions for general spin. The phase transition is found to be of first order at finite temperature and the angle θ between the spins and the direction of applied field changes discontinuously at the transition. The spin wave theory predicts a non-zero excitation energy gap in the limit of zero anisotropy in the spin-flop phase.View full abstractDownload PDF (888K) -
Hironobu Ikeda1981 Volume 50 Issue 10 Pages 3215-3221
Published: October 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSNeutron elastic and quasi-elastic scattering have been measured in homogeneously-mixed two-dimensional dilute antiferromagnets Rb2CocMg1−cF4. The result gives a first observation of sharp phase transition at the Néel temperature irrespective of magnetic concentration c even near the percolation threshold. The magnetic correlation length near the Néel temperature increases as the concentration of magnetic Co ions decreases.View full abstractDownload PDF (720K) -
Toshio Soda, Takaaki Arai1981 Volume 50 Issue 10 Pages 3222-3230
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSCritical velocities and dissipation of a superflow in a superfluid 3He are explained by the phase slippage due to the vortex ring like object through a narrower channel for the AC oscillatory flow. But for a DC superflow in a wider channel, they are explained by the depairing of the order parameter due to the supercurrent.View full abstractDownload PDF (1056K) -
Kazushige Machida, Takeo Matsubara1981 Volume 50 Issue 10 Pages 3231-3239
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWithin the mean field approximation the free energy is calculated for a system which has two kinds of long range order parameters, the superconducting (SC) order Δ and spin density wave (SDW) order M. The phase diagrams representing the SC, SDW and their coexistence states are derived under various conditions for the model parameters. Thermodynamic quantities such as the specific heat, entropy change and critical field are also evaluated near the transition points. Discussions on possible phase diagrams for (TMTSF)2PF6 under pressure are given.View full abstractDownload PDF (824K) -
Tsuyoshi Murao1981 Volume 50 Issue 10 Pages 3240-3244
Published: October 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSMagnetic properties of the nucleus-electron complex system which has the electronic singlet ground state are reanalyzed numerically in the vicinity of the threshold D⁄2\barJ=1, D being the energy splitting between the electronic ground and excited states. The spontaneous polarization of the electron spin increases steeply far below Tc by the effect of the nuclear spin. A fair agreement with the neutron diffraction experiment can be obtained for the praseodymium metal if it is assumed that the praseodymium metal is slightly in the nuclear regime, D⁄2\barJ=1.0002. In such case the nuclear specific heat is expected to show the narrowed Schottky type.View full abstractDownload PDF (612K) -
Mototada Kobayashi, Ikuji Tsujikawa1981 Volume 50 Issue 10 Pages 3245-3253
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMagnetic susceptibilities have been measured at temperatures down to 60 mK by AC Hartshorn bridge method for the potassium graphite intercalation compounds with several compositions (C8.0K∼C21.6K) prepared by the use of HOPG. Tc is nearly constant to be ∼150 mK for C8.0K∼C14.7K, while no transition is found down to 60 mK for C16.7K and C21.6K. As the K concentration is decreased, the superconducting characteristic changes from type II to type I for the magnetic field H parallel to the layers, while it maintains type I for H perpendicular to the layers. The superconducting fluctuation above Tc, the effective mass ratio and the curvature of Hc2 versus T curve are investigated; all of them lead to the result that 3D character increases with the decrease of the K concentration. The constancy of Tc above the critical K concentration is also discussed.View full abstractDownload PDF (1128K) -
Akio Kotani, Saburo Takahashi, Tomio Koyama, Masashi Tachiki, Hideki M ...1981 Volume 50 Issue 10 Pages 3254-3261
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAn effective exchange interaction between rare-earth magnetic moments near the surface of ferromagnetic superconductors is calculated under various surface boundary conditions both for the persistent current and the original exchange coupling in the normal state. In the bulk system, the persistent current screens the exchange interaction through the electromagnetic interaction, but the screening effect is weakened in the vicinity of the surface. The behavior of the penetrated magnetic field is calculated by using the obtained effective exchange interaction. Some discussions are given on the comparison between the present calculation and our previous calculation made by the boson transformation method.View full abstractDownload PDF (868K) -
Susumu Kurihara1981 Volume 50 Issue 10 Pages 3262-3267
Published: October 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSNonlinear time evolution of the condensate wave function in superfluid films is studied on the basis of a Schrödinger equation, which incorporates van der Waals potential due to substrate in its fully nonlinear form, and a surface tension term. In the weak nonlinearity limit, our equation reduces to the ordinary (cubic) nonlinear Schrödinger equation for which exact soliton solutions are known. It is demonstrated by numerical analysis that even under strong nonlinearity, where our equation is far different from cubic Schrödinger equation, there exist quite stable composite “quasi-solitons”. These quasi-solitons are bound states of localized excitations of amplitude and phase of the condensate (superfluid thickness and superfluid velocity, in more physical terms). Thus the present work shows the persistence of the solitonic behavior of superfluid films in the fully nonlinear situation.View full abstractDownload PDF (660K) -
Kei Yosida, Satoru Inagaki1981 Volume 50 Issue 10 Pages 3268-3277
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFour-spin exchange interactions in fcc spin lattice are investigated for the purpose of understanding anomalous magnetic properties of NiS2 with pyrite structure. It is shown that a phase transition is possible from the ordered phase with the first-kind spin ordering to the other ordered phase in which the second-kind ordering coexists with the first-kind ordering. Furthermore, this low temperature phase is expected also to have weak ferromagnetism induced by crystal-line anisotropy.View full abstractDownload PDF (1264K) -
Hiroyuki Shiba, Kimio Adachi1981 Volume 50 Issue 10 Pages 3278-3283
Published: October 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA theory is presented on the ESR due to spins at thermally activated domain walls in antiferromagnetic Ising-like chains. Several features of the resonance are pointed out, including a notable asymmetric line shape for the magnetic field tilted from the Ising axis. A study is made also on the effect of interchain molecular field on the temperature dependence of intensity.View full abstractDownload PDF (644K) -
Yoshitoshi Muraoka, Toru Fujiwara, Masayuki Shiga, Yoji Nakamura1981 Volume 50 Issue 10 Pages 3284-3291
Published: October 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSMössbauer and magnetic measurements were made on Fe–Co particles precipitated in a Cu matrix in order to investigate magnetic properties of fcc Fe–Co alloys around the concentration for the ferromagnetic to antiferromagnetic transition, using the samples Cu98(Fe1−xCox)2 with x=0.3∼0.45. The antiferromagnetic fcc Fe–Co with a small moment was observed at x=0.3, whereas the ferromagnetic fcc Fe–Co with nearly the full moment appears and coexists with the antiferromagnetic fcc Fe–Co for x=0.35∼0.4. The antiferromagnetic Fe–Co disappears around x=0.45. This sharp magnetic transition associated with a small change in the composition is quite similar to the case of Fe–Ni Invar alloys.View full abstractDownload PDF (876K) -
Fumihisa Ono1981 Volume 50 Issue 10 Pages 3292-3295
Published: October 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA simple relation between the magnetocrystalline anisotropy constant and the atomic distance for 3d-transition metals and alloys has been derived by considering the electron redistribution caused by a split of doublly degenerate energy bands. Experimental values of the pressure derivative of the magnetocrystalline anisotropy constants of iron, nickel and their alloys were explained as a sum of the electron redistribution term and the contribution of a change in the spontaneous magnetization due to the application of a hydrostatic pressure.View full abstractDownload PDF (556K) -
Kenji Sumiyama, Yoshiaki Emoto, Masayuki Shiga, Yoji Nakamura1981 Volume 50 Issue 10 Pages 3296-3302
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSMagnetization, thermal expansion and forced volume magnetostriction have been measured for Fe1−xPtx ordered alloys (x=0.23–0.27). In the fcc alloys (x≥0.25), the atomic moment and the spontaneous volume magnetostriction increase monotonically with decreasing x, implying the Fe–Pt Invar alloys to be homogeneous and strong ferromagnets even around the γ-α phase boundary. On the other hand, the magnetic moment of the α phase (x<0.25) is a little larger than that of the γ phase, suggesting a very weak magnetic field dependence of the Ms temperature. The observed large spontaneous volume magnetostriction may play an important role in determining the favorable conditions for the thermoelastic martensite transformation in the Fe–Pt alloys.View full abstractDownload PDF (796K) -
Naoko Kasai, Shinya Waki, Shinji Ogawa1981 Volume 50 Issue 10 Pages 3303-3307
Published: October 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe thermal expansion of MnTe2 has been measured. A small anomaly in thermal expansion has been observed at 60 K, which is probably due to a change of internal parameter of crystal. The coefficient of thermal expansion has been separated into lattice, magnetic and Schottky contributions. The magnetic entropy associated with an antiferromagnetic ordering is computed from the observed coefficient of thermal expansion to be (10.8±0.18)J/K·mol. It is concluded that in MnTe2 zero field splitting of the 6S5⁄2 is small. The Grüneisen constant for Schottky contribution is negative.View full abstractDownload PDF (620K) -
Shuzo Takano, Shigeki Hoshino1981 Volume 50 Issue 10 Pages 3308-3312
Published: October 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA new type of the oscillatory variations of the attenuation coefficient of the longitudinal sound wave was found in zinc in magnetic field up to 23 kG at liquid He temperatures. The oscillations were observed only when the direction of the propagation of the sound wave is parallel to the [0001]-axis of the crystal and are qualitatively different from the usual de Haas-van Alphen type oscillations and the giant quantum oscillations. From the power spectrum analysis, it was found that three components are contained in the oscillations, the frequencies of which are very good linear functions of the angle between the magnetic field and the [0001]-axis. While the amplitude is rather insensitive to temperature, it is an increasing function of the frequency of the sound wave approximately obeying the law f3⁄2 between f=10 MHz and 90 MHz.View full abstractDownload PDF (588K) -
Akira Hasegawa1981 Volume 50 Issue 10 Pages 3313-3320
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe one-electron energy band structure for LaSn3, which attracts interest as a proper reference material for the study of the valence-fluctuating state in CeSn3, is calculated by a self-consistent APW method with the local-spin-density approximation exchange potential. The narrow La 4f bands lie a few eV above the Fermi energy, EF, and do not affect the Bloch states near EF seriously. The partial and total density of states, the Fermi surface, the angular variation of the extremal cross-sectional area and the cyclotron mass are carefully calculated. The Fermi surface consists of a small, nearly spherical hole sheet centred at Γ in the seventh band, and a small, highly distorted hole sheet centred at Γ and a large multiply-connected sheet in the eighth band. These calculated results account reasonably well for the recent de Haas-van Alphen effect experiment.View full abstractDownload PDF (1160K) -
Shoichi Mase, Masahiro Akinaga, Yasukuni Matsumoto1981 Volume 50 Issue 10 Pages 3321-3328
Published: October 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSMagnetoacoustic attenuation in Bi1−xSbx alloys has been investigated for samples with x=1.0×10−4, 3.6×10−4, and 8.6×10−4. The magnetic field vector H has been applied perpendicularly or nearly perpendicularly to the sound wave vector q. It has been found that for q parallel to the bisectrix axis hump and dip type quantum oscillations with greatly enhanced amplitudes are inverted from the former type to the latter one, as increasing the concentration of antimony x or the angle ν(=|q∧H−90°|), or as decreasing the sound wave frequency f. It is suggested that these peculiar dependences on x, ν and f come from a combined effect of the tilt effect and some relaxation mechanism which is ascribed to the electron-hole recombination process shown in the succeeding paper.View full abstractDownload PDF (784K) -
Shoichi Mase, Takeshi Fukami, Masahiro Akinaga, Yasukuni Matsumoto1981 Volume 50 Issue 10 Pages 3329-3340
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPeculiar dependences of dip and hump type quantum oscillations with greatly enhanced amplitudes in magnetoacoustic attenuation in dilute Bi1−xSbx alloys are theoretically investigated. The dependences studied are those on the direction of the sound wave vector q, the antimony concentration x, the sound wave frequency f, and the angle between q and the magnetic field vector H. It is assumed that the electron-hole recombination time τr of the alloys decreases greatly from that of pure bismuth. On the basis of Kuramoto’s expression for the sound attenuation including the recombination process, almost all aspects of the above-mentioned dependences are explained in detail.View full abstractDownload PDF (1216K) -
Yorihiko Tsunoda, Nobuyoshi Wakabayashi1981 Volume 50 Issue 10 Pages 3341-3348
Published: October 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe phonon dispersion relations in Mn-rich γ-MnCu alloys have been studied by means of neutron inelastic scattering. At the martensitic transformation, the [100] longitudinal phonon branch shows softening near the Γ point. In addition, the elastic constant C12 is negative in a certain temperature range near the transition and the structural phase transition is caused by the vanishing of C11+2C12. This mechanism of the martensitic transformation can successfully explain the peculiar properties of the γ-MnCu alloy system and the difference between this alloy and the γ-MnNi system. The tetragonal lattice deformation in the γ-MnCu alloy may be considered to be induced by the magnetic coupling force which accompanies the long-range magnetic order.View full abstractDownload PDF (868K) -
Hiroshi Tanaka, Koichi Shindo1981 Volume 50 Issue 10 Pages 3349-3355
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSLittlewood’s assumption in the calculation of the transverse effective charge (TEC) of IV–VI compound semiconductors is studied by the simple calculation at W-point on the Jones zone surfaces based on the Heine-Jones model. It is shown that the main peak of optical absorption spectrum cannot be assigned only to (111) component of the effective charge in contrast with Littlewood’s assumption. The TEC is directly calculated by executing the band calculation with the potential obtained by the EPM in the framework of Vogl’s expression. The calculated result gives better agreement with experiment than Littlewood’s. The acoustic sum rule is also studied by using the similar formulation given by Vogl.View full abstractDownload PDF (856K) -
Shunji Sugai, Toru Ueda, Kazuo Murase1981 Volume 50 Issue 10 Pages 3356-3361
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe lattice vibration of black phosphorus was investigated under hydrostatic high pressure by polarized Raman scattering. On applying pressure the crystal structure changes to the rhombohedral A7-structure from the layered orthorhombic structure at 52 kbar. At atmospheric pressure four phonon modes are observed at 362 cm−1 with Ag-symmetry, 467 cm−1 Ag, 194 cm−1 B1g and 439 cm−1 B2g. The Grüneisen parameters are 0.74 for the 362 cm−1 Ag-mode, 0.10 for the 467 cm−1 Ag-mode and 0.22 for the 439 cm−1 B2g-mode. The energies of the latter two modes change little with pressure, since in these modes the atoms displace to deform the rigid zigzag chain along the a-axis. In the A7-structure the A1g-mode was observed at 466 cm−1 and the Eg-mode at 392 cm−1. The comparison with the phonon modes in other group V materials was made.View full abstractDownload PDF (696K) -
Yukihiro Takao, Hideo Asahina, Akira Morita1981 Volume 50 Issue 10 Pages 3362-3369
Published: October 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe energy band structure of black phosphorus is calculated for the first time using the tight binding approach. It is shown that black phosphorus is a narrow gap semiconductor with the direct energy gap at the zone edge in the (0 0 kz) direction. The pressure dependence of the energy gap is calculated to be −2.61×10−2 eV/kbar, its experimental counterpart being −2.51×10−2 eV/kbar. The optical absorption and the electrical conductivity of black phosphorus single crystals are discussed in terms of the calculated band structure.View full abstractDownload PDF (848K) -
Masao Kamada, Kenjiro Tsutsumi1981 Volume 50 Issue 10 Pages 3370-3377
Published: October 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThermally stimulated exoelectron emission (TSEE) in pure and Cu-doped NaCl crystals, which are cleaved in a clean high vacuum and X-irradiated at 77 K, is measured simultaneously with thermoluminescence (TL). The emission and absorption spectra, the decay of the TSEE and TL intensities and the change in the glow curves by the F-light stimulation, are also measured. The main TSEE glow peaks are ascribed to reaction of color centers as well as the TL glow peaks. Among them, the TSEE glow peak at about 160 K in these crystals is due to the diffusion of VK centers and the subsequent reaction of them with F′ centers. The release-process of the electrons in this case may be interpreted in terms of a kind of Auger effect.View full abstractDownload PDF (1076K) -
Shohei Wakita, Yoshiro Suzuki, Hirofumi Ohtani, Seiichi Tagawa, Masami ...1981 Volume 50 Issue 10 Pages 3378-3383
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe decay time (τσd) of the σ emission intensity has been observed in temperature range of 5 K∼200 K by using a pulsed electron beam in picosecond range. τσd in KI, NaCl, KBr and RbBr are 1.9 ns (7.4 K), 3.0 ns (∼5 K after Blair et al.), 3.7 ns (5.7 K) and 4.0 ns (5.6 K), respectively, and start to decrease to 100 ps or less above nearly 70 K, 40 K, 30 K and 20 K depending on the crystal. The activation energy for such thermal quenching of τσd are 46.2 meV, 32.0 meV, 22.1 meV and 14.7 meV. The capture process of the conduction electron by the self-trapped hole and the non-radiative decay of the self-trapped exciton are discussed.View full abstractDownload PDF (704K) -
Kêitsiro Aizu1981 Volume 50 Issue 10 Pages 3384-3391
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIn several ferroelectrics of faintness index 2 making a first order transition, it was observed that Ps is T independent and that εfer<εprt at Tc (fer is short for “ferroic”, and prt for “prototypic”). The present paper explains these facts theoretically, upon the usual simplest assumptions about the manners of T dependence of the coefficients in the free energy function. Two different theories are offered. In one of them, a dimensionless material constant r is defined using some coefficients in the free energy function. The following are found. If r≈1, Ps is almost T independent, and εfer<εprt at Tc. If (Remark: Graphics omitted.) and <1, |Ps| increases with cooling from Tc. If (Remark: Graphics omitted.) and >1, |Ps| decreases. In the two latter cases, εfer> or <εprt at Tc; either is possible. There exist theories by other authors, on which criticism is offered.View full abstractDownload PDF (920K) -
Shunsuke Hirotsu, Yasuo Kunii, Ikuo Yamamoto, Masaaki Miyamoto, Toshih ...1981 Volume 50 Issue 10 Pages 3392-3397
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBrillouin scattering spectra of NH4LiSO4 were measured in a temperature range of 20∼250°C including the ferroelectric phase transition temperature, Tc=186.5°C. The principal indices of refraction na and nc were also measured in the same temperature range in order to calculate the elastic constants from the Brillouin shifts. The elastic constants c11, c22, and c33 all show quite similar temperature dependence; they are nearly constant above Tc and increase monotonically with decreasing temperature below Tc. It is shown, on the basis of the phenomenological theory, that the observed elastic anomalies are ascribed to the thermal expansion and/or the fourth-order coupling between the order parameter and the strains.View full abstractDownload PDF (820K) -
Hiroshi Kawata, Shigeo Suzuki, Mieko Takagi1981 Volume 50 Issue 10 Pages 3398-3406
Published: October 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSLattice strain at 180° domain walls in BaTiO3 has been studied by X-ray topography for the case of a-plate in which the spontaneous polarization Ps is parallel to the surface of the plate. At the 180° domain boundaries which were not parallel to Ps, domain walls of 2∼3 μm thick with strained lattices were observed. Estimated lattice distortion was the shear strain of x23\simeq1.6×10−4. The additional polarization normal to Ps was estimated from the shear strain and the resultant polarization became nearly parallel to the boundary. The strained wall was not detected for the wall which was parallel to Ps. Moiré fringes observed at the wedge-shaped domain boundary were well explained by the interference between the diffracted X-rays from two antiparallel domains having a strained domain wall between them.View full abstractDownload PDF (2524K) -
Hidetoshi Fukuyama1981 Volume 50 Issue 10 Pages 3407-3414
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEffects of mutual interactions on conductivity, magnetoresistance and spin-susceptibility have been examined in the weakly localized regime of two-dimensional disordered systems. Both conductivity and spin-susceptibility have logarithmic correction with respect to temperature. Field dependence of the magnetoresistance, which can be appreciably different from that due to impurity scattering alone, is shown to be sensitive to temperature.View full abstractDownload PDF (824K) -
Shin-ya Miyatani1981 Volume 50 Issue 10 Pages 3415-3418
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIonic conductivities σi of silver chalcogenides have been measured as functions of the temperature and the carrier concentration ni. It has been found that σi is larger in bcc than in fcc by about 20% at the phase transition (Remark: Graphics omitted.), and ∂σi⁄∂(eni) is several times larger than the mean mobility σi⁄eni. The latter is discussed in terms of the caterpillar mechanism.View full abstractDownload PDF (420K) -
Daijiro Yoshioka, Yoshiyuki Ono, Hidetoshi Fukuyama1981 Volume 50 Issue 10 Pages 3419-3426
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA self-consistent treatment of the Anderson localization by Vollhardt and Wölfle [Phys. Rev. B22 (1980) 4666] is extended to systems without time reversal symmetry by use of a diagrammatical method. In this paper magnetoresistance in two dimension is calculated for the case where the field effect can be treated quasiclassically. It is found that the magnetic field enhances the conductivity, though the system remains insulator in the absence of inelastic scatterings. The present investigation indicates that the one-parameter scaling theory cannot describe systems without the time reversal symmetry.View full abstractDownload PDF (828K) -
Norio Akiyama, Kumiko Asami, Masakazu Ishiguro, Hiroshi Ohkura1981 Volume 50 Issue 10 Pages 3427-3435
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe degree of polarization of F center luminescence, PS, induced by a uniaxial stress has been investigated in KF, KCl, KBr, KI, RbF, RbCl, RbBr, and CsBr crystals. Polarizations associated with Γα mode coupling, PS(Γα), were observed under the relevant experimental geometries. The observation of PS(Γ5) and its temperature dependence in the range from 2 K to 77 K were first presented. This temperature dependence was found to be contrasted to that of PS(Γ3) which was also precisely observed in this work. Three sorts of linear stress coefficients, that was PS(Γα) per unit stress applied, were tabulated for α=3, 5, and a combination of 3 and 5. A vibronic parameter of Γ5+-mode phonons was estimated to be small compared with that of Γ3+-mode.View full abstractDownload PDF (1072K) -
Shinsuke Watanabe, Morikazu Toda1981 Volume 50 Issue 10 Pages 3436-3442
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSInteraction of a soliton with a mass impurity in the exponential lattice has been studied by means of a computer simulation. We particularly investigate the decrease of the soliton amplitude due to an impurity. The present computation shows that the decrease of amplitude is proportional to (AIND)2 in the region of AIN|D|\lesssim1, where AIN denotes the incident soliton amplitude and the mass defect D is defined by 1-Q, if Q denotes the mass ratio of the impurity to the host particle. The relation holds whether the impurity is lighter (Q<1) or heavier (Q>1) than the host particle. The result agrees qualitatively with the perturbation theory based on the inverse method. In the case of a light impurity, there remains a localized mode near the impurity site, after a soliton has passed through the impurity. The frequency of the localized mode decreases as the amplitude of the mode increases, in a qualitative agreement with a simple mode-coupling theory.View full abstractDownload PDF (788K) -
Shinsuke Watanabe, Morikazu Toda1981 Volume 50 Issue 10 Pages 3443-3450
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSInteraction of a soliton with a mass impurity has been experimentally investigated in a nonlinear electric circuit which is equivalent to an infinite or a semi-infinite exponential lattice. After a soliton collided with a light mass impurity, there remains a localized mode in the vicinity of the impurity. The frequency of the localized mode is above the cut-off frequency of the system, and increases as the mass ratio is decreased. In an infinite system, the soliton amplitude is decreased by a light mass impurity in proportion to the square of mass defect and of the amplitude. In the case of a heavy impurity, the transmitted wave breaks into multiple solitons. In a semi-inifinite system with a light impurity on a surface, the reflected signal is explained by a collisionless shock model.View full abstractDownload PDF (1048K) -
Arisato Ejiri, Fuyuhiko Sugawara, Hideo Onuki, Masahiro Hirano, Takahu ...1981 Volume 50 Issue 10 Pages 3451-3458
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSWe have studied the optical properties of lead and bismuth in the extreme ultraviolet region with high resolution by using synchrotron radiation. Absorption spectra of the outermost 5d core-levels for those metal films were separated into two components of spin-orbit splitting and discussed on the basis of the band structure calculations in each metal. It has been shown that the sharp spike at the 5d5⁄2 edge in bismuth as well as the round shape of the edge in lead could be described well in terms of the interband transition from the core level to the conduction band.
Ultraviolet photoemission spectroscopy of the Pb 5d core-levels was also performed. The amount of the spin-orbit splitting which was accurately determined from the energy distribution curve showed a good agreement with that of the optical absorption spectrum.View full abstractDownload PDF (1024K) -
Yoichi Taira, Tatsuo Yajima1981 Volume 50 Issue 10 Pages 3459-3466
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA detailed theoretical analysis is given for the ultrafast relaxation study using polarization spectroscopy in the frequency domain to clarify the effect of cross relaxation on the measured results. It is shown that the calculated nonlinear spectral response function reflects the inhomogeneous width rather than the homogeneous one if the rate of cross relaxation of the transition becomes so singnificant. This prevents us from precise determination of phase relaxation Time T2 of the transition by the stationary polarization spectroscopy. It is further shown that the cross relaxation effect onto the measured spectral response function can effectively be diminished by introducing a partially transient condition. An experiment using picosecond light pulses is presented to demonstrate this fact.View full abstractDownload PDF (1020K) -
Kazuko Sekizawa, Hiroshi Chihara, Ko Yasukochi1981 Volume 50 Issue 10 Pages 3467-3471
Published: October 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSFrom X-ray powder diffraction measurements, the CsCl type compounds of rare earth elements with thallium have been shown to undergo a cubic to tetragonal phase transformation with decreasing the temperature. The transition proceeds very gradually with temperature and the co-existence temperature range of the cubic and the tetragonal phase spreads over about 200 K for each compound. The temperature Tc at which the transformation starts is well defined. The highest value of Tc is 300 K for GdTl. The compound LaTl shows no transformation down to 8 K.View full abstractDownload PDF (476K) -
Hikaru Terauchi, Takashi Ueda, Ichiro Hatta1981 Volume 50 Issue 10 Pages 3472-3475
Published: October 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe successive phase transitions in partially polymerized crystal of bis (p-toluene sulfonate) ester of 2,4-hexadiyne-1,6-diol (TSHD) are carefully examined by X-ray diffraction method. The triple peaks around q=(0.5, 0, 0) were observed in the intermediate phase and the intensity decreases with increasing temperature. The transition is fairly diffusive in contrast with the monomer crystal. The phase transition in the fully polymerized crystals was also examined. From the X-ray diffraction study, it is shown that the intermediate phase disappears in the fully polymerized crystal and the transition becomes sharp first-order one.View full abstractDownload PDF (460K) -
Takashi Fujimoto, Kuniya Fukuda1981 Volume 50 Issue 10 Pages 3476-3481
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSPulsed-laser selective-excitation has been applied to a helium discharge plasma to excite the 31P level. From the observed population perturbations of 31P, 31D and 33D levels the cross section has been determined for the excitation transfer by atomic collisions: for 31P→33D it is (1.40±0.11)×10−18 cm2, and for 31D→33D it is (1.25±0.26)×10−17 cm2. The possibility has been examined that these transfer processes are interpreted from the mixing of the 31D2 and 33D2 atomic wavefunctions that is due to the spin-orbit interaction; the former cross section is compared with the 31P→31D transfer cross section, and the latter is compared with the 31D-level dis-alignment collision cross section, which is measured to be (1.63±0.09)×10−14 cm2. Discrepancies by one order of magnitude for the both cases indicate the obvious violation of Wigner’s spin rule.View full abstractDownload PDF (840K) -
Takashi Matsuo, Nobuo Kobayashi, Yozaburo Kaneko1981 Volume 50 Issue 10 Pages 3482-3490
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSEnergy distributions of metastable argon atoms ArM produced by charge transfer collisions of metastable argon ions Ar+M with Ar, Kr and Xe were measured by a time-of-flight technique at 10 eV region. The ArM’s were found to be formed by only exothermic reactions. The analysis of the energy distributions revealed that in any case, certain excited states of atom Ar* are produced by the collisions and ArM follows via the radiative decay from the Ar* presumably of the 3p53d state. A hypothesis of one-electron-process for the charge transfer is proposed.View full abstractDownload PDF (1228K) -
Hiromi Sasaki, Hokotomo Inouye, Toshiaki Ishikawa1981 Volume 50 Issue 10 Pages 3491-3496
Published: October 15, 1981
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSLight emission in collisions of N+ ion beams with CO molecules was observed in the LAB energy range 10–300 eV. Intense emission due to the transition A 2Π-X 2Σ+ of CO+ formed by charge transfer was observed and used to determine the vibrational population distribution in the upper electronic energy state. The distribution is different from that produced in the Ar+–O or the N2+–CO collision system.
Chemiluminescence which is presumed to be due to excited CN+ ions formed in the reactive collisions of N+ with CO was observed in the spectral range shorter than 3100 Å and at collision energies of 40–150 eV. Line spectra of C(3s 1P–2p2 1D and 3s 1P–2p2 1S) were also clearly found. C(3s 1P) atoms, at least part of them, are thought to be produced by another branch of the reaction of N+ with CO.View full abstractDownload PDF (716K) -
Shigeo Kawata, Takashi Abe, Keishiro Niu1981 Volume 50 Issue 10 Pages 3497-3502
Published: October 15, 1981
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSBy using the method of characteristics, numerical calculations are carried out to analyze the isentropic compression of a spherical DT pellet whose initial state is uniform and whose final state is nonuniform which is favorable for igniting a thermonuclear burning wave. Through such an isentropic compression, the central part of the pellet can be compressed to a high density and a high temperature. It is shown that a thermonuclear burning wave which is ignited in this part propagates into the other part of the pellet. Thus a large pellet gain of order 100 can be expected to be realized through this kind of isentropic compression.View full abstractDownload PDF (612K)