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- Proceedings of the Physico-Mathematical Society of Japan. 3rd Series
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Volume 51, Issue 3
Displaying 1-50 of 55 articles from this issue
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Minoru Takahashi1982 Volume 51 Issue 3 Pages 685-686
Published: March 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIt is shown by choosing an appropriate variational wave function that the ground state energy is not affected by the repulsive delta-function potential in two and three dimensional systems. Scattering cross section by the repulsive delta-function potential is shown to be zero.View full abstractDownload PDF (156K) -
P. Gluck1982 Volume 51 Issue 3 Pages 687-688
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA semiempirical numerical calculation based on compressibility sum rule and additivity of electronic and ionic bulk moduli is reported, in which Brout’s criterion for superconductivity is modified. It is shown that instead of the absolute magnitude, the sign of the ratio of the two moduli plays the important role.View full abstractDownload PDF (156K) -
Shun-ichi Kobayashi, Youiti Ootuka, Fumio Komori, Wataru Sasaki1982 Volume 51 Issue 3 Pages 689-690
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSTemperature and magnetic field dependence of conductivity in highly resistive thin film of Ni was measured at low temperatures. Conductivity varied as σ0+A ln T, where A was very close to e2⁄2π2h. Magnetoconductivity was positive, temperature-independent and as small as 0.1% in 10 kOe. It was isotropic with the direction of magnetic field for the film of 60 A thick, while in 40 A film an anisotropy was observed.View full abstractDownload PDF (208K) -
Takashi Kamimura, Takao Iwata1982 Volume 51 Issue 3 Pages 691-692
Published: March 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe magnetization and the magnetic torque have been measured on (Fe1−xCox)7Se8 with the 3c structure of the NiAs type. It is shown that the change of the easy-axis from the c axis into the c plane with rising temperature is a transition of the first order up to x=0.10 and a gradual one at x=0.15. For x≥0.20, the easy axis lies in the c direction over the whole temperature range lower than the Curie temperature. The observed behavior is discussed in connection with the origin of the anisotropy.View full abstractDownload PDF (248K) -
Shin-ichi Kuroda, Madoka Tokumoto, Nobumori Kinoshita, Hideki Shirakaw ...1982 Volume 51 Issue 3 Pages 693-694
Published: March 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSESR measurements were done in stretched films of undoped cis-rich (CH)x at X band. The anisotropy was observed in linewidth and g value. Both quantities showed maxima when the external field was parallel to the stretch direction of the film and showed minima when the field was perpendicular to this direction. Those features are reasonably explained by the anisotropic property of the carbon p-π orbital and strongly suggest that the ESR center has its origin in the p-π electron in undoped (CH)x.View full abstractDownload PDF (236K) -
Keizo Murata, Takashi Ukachi, Hiroyuki Anzai, Koji Kajimura, Gunzi Sai ...1982 Volume 51 Issue 3 Pages 695-696
Published: March 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSA novel nonlinear characteristics of the resistivity above the superconducting critical current was observed along the a-axis of the di-(tetramethyltetraselenafulvalene)-perchlorate [(TMTSF)2ClO4] by measuring the voltage-current characteristics. The nonlinearity has close relations with the appearance of the semiconducting phase just above the superconducting phase.View full abstractDownload PDF (256K) -
Yasuyuki Kanai, Seiichi Kagoshima, Hiroshi Nagasawa1982 Volume 51 Issue 3 Pages 697-698
Published: March 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSSatellite reflections, which indicate the occurrence of the structural phase transition, were found in β-Na0.33V2O5 and β-Li0.36V2O5 by X-ray diffraction measurements. In the case of Na0.33V2O5, the satellite with the wave vector of (0, 0.5, 0) grows below 200 K. In the case of Li0.36V2O5, there are three types of satellites; (0, 0.53, 0), (0, 0.57, 0.125), (0, 0.5, 0.5). In both cases of Na0.33V2O5 and Li0.36V2O5, the b component of the wave vector of the superstructure may be explained by the ordering of V4+–V4+ pairs.View full abstractDownload PDF (228K) -
Yuhji Tsujimi, Toshirou Yagi, Itaru Tatsuzaki1982 Volume 51 Issue 3 Pages 699-700
Published: March 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe anisotropic sound attenuation in the ferroelectric triglycine sulfate has been studied by the observation of the Brillouin spectral width in the bc-plane. The full width at half maximum of the Brillouin satellite shows an anisotropic anomaly at T=44.94°C in the ferroelectric phase. This is inferred to be caused by the polarization fluctuation which is anisotropically suppressed by the depolarization field.View full abstractDownload PDF (276K) -
Kazuo Gesi1982 Volume 51 Issue 3 Pages 701-702
Published: March 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe effect of d. c. bias electric field on the ferroelectric III phase in SC(NH2)2 and SC(ND2)2 were studied. The region of III phase nonlinearly increases with applied bias field. By extrapolation the region of III phase at zero field was determined as ∼0.5 K for SC(NH2)2 and less than 0.3 K for SC(ND2)2. These values are much narrower than those believed before.View full abstractDownload PDF (228K) -
Takasi Kawaguti, Yasunobu Fujimori1982 Volume 51 Issue 3 Pages 703-704
Published: March 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe electrical resistance of ultra thin gold films increases as the temperature is lowered below 6 K. The magnetoresistance is positive and anisotropic. A logarithmic dependence of the resistance on magnetic field has been observed. The results are in qualitative agreement with the recent theories of the electron localization in two-dimensional systems.View full abstractDownload PDF (256K) -
Yasunori Yanagisawa1982 Volume 51 Issue 3 Pages 705-706
Published: March 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSIn the thermal desorption spectra (TDS) of molecular oxygen, three peaks of isotopically exchanged molecules 16O18O at 210, 260 and 650 K and a single peak of 16O2 at 690 K are observed after adsorption of 18O2 on UV-irradiated MgO powders. The formation of exchanged species is shown to be related to the presence of Fs+ centers on the surfaces.View full abstractDownload PDF (244K) -
Tadashi Itoh, Takashi Katohno1982 Volume 51 Issue 3 Pages 707-708
Published: March 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSOrigin of the broadening and asymmetry of the giant two-photon absorption (GTA) band for the direct generation of excitonic molecules (EM) is investigated through the measurement of the induced circular dichroism and depolarization of a transmitted laser light resonated around the GTA peak. The plausible origin is suggested to be ascribed to the broadening of the EM state caused by the collision between EM and excitonic polariton both created resonantly with the GTA.View full abstractDownload PDF (296K) -
Shigeo Naya, Masao Abe1982 Volume 51 Issue 3 Pages 709-715
Published: March 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe structural phase transition in helical polymer crystal is investigated from a statistical-mechanical point of view. Starting from an effective Hamiltonian per chain molecule, the self-consistent equation is obtained in a mean field approximation. On the basis of this equation, some types of possible phase transitions are investigated. The pressure-dependence of the transition point is also considered. As an application of the theory, the structural phase transition in polytetrafluoroethylene (PTFE) crystal is qualitatively discussed.View full abstractDownload PDF (696K) -
Daijiro Yoshioka1982 Volume 51 Issue 3 Pages 716-722
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSSelfconsistent diagrammatic scheme for the calculation of dynamical conductivity of two dimensional electrons by Yoshioka, Ono and Fukuyama [J. Phys. Soc. Jpn. 50 (1981) 3419], which is obtained by refining the method of Vollhardt and Wölfle, is applied to a system with paramagnetic impurities and spin-orbit scattering. It is shown that the spin-orbit scattering or the spin-flip scattering by paramagnetic impurities destroys the localization of two-dimensional electrons.View full abstractDownload PDF (764K) -
Takehiko Oguchi, Takuma Ishikawa, Haruo Yoshida1982 Volume 51 Issue 3 Pages 723-729
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe spin Hamiltonian with spin-1 system including a single parameter is proposed which expresses the 3-state Potts model (PM) or antiferromagnetic Potts model (AFPM) according as a value of the parameter. They are investigated by a new method which is the extension of the effective Hamiltonian method in a unified way. The first-order transition or the second-order transition are obtained for the PM or the AFPM, respectively. In the AFPM, the ordered phase has a residual entropy, nevertheless the ordered phase can exist stably.View full abstractDownload PDF (716K) -
Takeo Izuyama, Yasuhiro Akutsu1982 Volume 51 Issue 3 Pages 730-740
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe modified dimer model representing the cooperative nature of the conformation changes of the hydrocarbon chains is analyzed on the basis of the transfer matrix formalism established rigorously in the previous paper. The free energy is evaluated in the limit of infinite dimer lattices by means of the trial function of the free fermion type. The power series expansion of the free energy with respect to ρ, the disorder parameter, has been calculated up to the ρ4 term without resorting to any further approximation. The modified dimer model is extended so as to include the dilation of the dimer lattice. This extended model with certain parameter values exhibits the first order phase transition. Finiteness of the hydrocarbon chains is also taken into consideration in our formalism. The finiteness may bring the transition point to the vicinity of the spinodal. In consequence, the pseudo-critical phenomena appear in a very narrow temperature region around the transition point. The quasi-critical behavior observed at and around the main transition is interpreted as such.View full abstractDownload PDF (1184K) -
Masahito Hosino, Huzio Nakano, Hatsuo Kimura1982 Volume 51 Issue 3 Pages 741-748
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe method of symmetry breaking potential is applied to the system of identical rigid molecules with simple typical shapes (rod with square cross-section, square plate and cube), which are perfectly aligned, to examine the occurrences of such various types of spatial ordering as in smectic, columnar and crystalline phases in relation to the molecular shape. A smectic A phase occurs in the system of rigid rod molecules much more easily than the close packed crystal structure does in the system of rigid sphere molecules. Columnar and crystalline phases do also similarly in the system of molecules of square plate and cube, respectively. It is also shown that the nematic-smectic A transition in the case of rigid rod molecules in perfect alignment is the second order one, in contrast with those in the others of typical first order transitions. The effect of orientational fluctuation is discussed in short.View full abstractDownload PDF (844K) -
Osamu Sakai, Sadamichi Maekawa, Masashi Tachiki1982 Volume 51 Issue 3 Pages 749-759
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIn mixed states of ferromagnetic superconductors, the spin polarization and the distortion of vortex line lattice form coupled fluctuation modes. The spin polarizability is enhanced by this coupling. When an external magnetic field is large, a mixed state with large vortex number appears. Spins are almost uniformly polarized in this state.When the applied field decreases, transition to a state with the smaller vortex number takes place. In this state divergence of the spin polarizability occurs. This indicates the appearance of a state with oscillatory spin polarization stabilized by the distortion of vortex line lattice from the triangular structure. Waved vortex lines also appear. The wave length increases as the vortex number increases.View full abstractDownload PDF (1360K) -
Toshimasa Uemura, Seishi Takagi, Kiichi Okuda, Muneyuki Date1982 Volume 51 Issue 3 Pages 760-766
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe magnetic properties of an organic charge-transfer salt, (1-methyl-3′-ethyl-2,2′-quinoselenacyanine)-(tetracyanoquinodimethane)2—(MEQSeC-[TCNQ]2) are studied by magnetic susceptibility, electrical conductivity and ESR measurements in the temperature region from 4.2 to 290 K. It is found that the spin correlation changes widely with changing temperature. The system is diamagnetic except impurity spins around 4.2 K. However, the spin system changes to pair like (35∼65 K), 1-D like (65∼160 K) and 2-D or 3-D like (160∼290 K) systems gradually as the temperature increases from 30 to 290 K. The observed changes are explained by relating with the semiconductive nature of the crystal.View full abstractDownload PDF (812K) -
Hideo Hasegawa1982 Volume 51 Issue 3 Pages 767-775
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe pressure dependence of the critical temperature is discussed for ferromagnetic and antiferromagnetic metals. The single-site spin fluctuation theory developed by the present author using the functional integral method is extended to include the volume dependences of the band structure and of the electron-electron interaction due to applied pressure. Numerical calculations are performed for NiFe alloys, which account for anomalously large negative pressure effect on the Curie temperature in the NiFe Invar alloys. This effect is shown to arise from a considerable reduction of amplitude of local magnetic moments due to pressure. It is concluded that the Invar anomalies are due to non-rigid local moments whose amplitudes vary easily by changing external parameters such as the temperature and the pressure. The pressure dependence of the Néel temperature of antiferromagnetic metals is also discussed by using the present theory with the Bell shape model band.View full abstractDownload PDF (1172K) -
Yoshihiro Kuroda, K. H. Bennemann1982 Volume 51 Issue 3 Pages 776-781
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSUsing a simple phenomenological model, we demonstrate that explicit account of the effects of the lattices under constant pressure may lead to entirely different features of the metal-insulator transitions in the mixed-valent systems than those obtained in the previous studies done by using the Falicov, Kimball & Ramirez models and/or their modifications.View full abstractDownload PDF (764K) -
Kenn Kubo1982 Volume 51 Issue 3 Pages 782-786
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe effect of the strong Hund coupling on the magnetic property of the ground state is studied based on the double exchange model. For one dimensional chains the ground state is proved to have the maximum total spin. The effect of the Pauli principle is shown to destroy the ferromagnetic ground state by numerical studies of finite loops. The result is extended to a model with degenerate bands.View full abstractDownload PDF (584K) -
Masashi Takigawa, Hiroshi Yasuoka1982 Volume 51 Issue 3 Pages 787-793
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe Knight shift and the nuclear spin-lattice relaxation rate (1⁄T1) of 105Pd nuclei has been measured in an exchange-enhanced paramagnet Pd metal, in the temperature range between 4.2 and 300 K. From the Knight shift measurement the core polarization hyperfine field is obtained to be −(3.39±0.03)×105 Oe/μB. 1⁄T1 is proportional to temperature with the value, 1⁄(T1T)=1.35±0.03 sec−1K−1, below about 150 K, while 1⁄T1 begins to deviate from this relation to smaller values at higher temperature. Relaxation rate due to d-electron spin, (1⁄T1)d, was obtained by subtracting the estimated values of other contributions from measured 1⁄T1. From the value and the temperature dependence of (1⁄T1)d, we conclude that (1⁄T1) is mostly determined by the long wavelength component of the spin fluctuation in the whole temperature range.View full abstractDownload PDF (876K) -
Takeo Jo1982 Volume 51 Issue 3 Pages 794-802
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe magnetic structure in the ground state of alloys between the ferromagnetic and the antiferromagnetic metals is investigated by using the coherent potential approximation (CPA) combined with the Hartree-Fock (HF) approximation for the Hubbard Hamiltonian. By bearing in mind Fe–Cr alloys, the successive transitions from the ferromagnetic state to the antiferromagnetic one via the spin glass one with varying the alloy composition are demonstrated by the HF–CPA calculation, which distinguishes Fe atoms with magnetic moments parallel to the bulk magnetization or the sublattice one from those with antiparallel moments. An overall agreement between various magnetic measurements on Fe–Cr and the present calculation is obtained.View full abstractDownload PDF (1200K) -
Shoichi Tomiyoshi1982 Volume 51 Issue 3 Pages 803-810
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe magnetic structure of a weak ferromagnetic Mn3Sn has been studied by polarized neutron diffraction at room temperature. Large flipping ratios were observed for the 100 and 110 reflections under application of a magnetic field in the c-plane perpendicular to the scattering vector. The spin structure deduced from the h0l and hhl reflections has a triangular configuration but the spin plane is not determined. For applied field parallel to [010] the spin-A is parallel to [010], but for applied field parallel to [\bar110] the spin-B is antiparallel to [\bar110]. The magnetic form factor of the Mn atom agrees with the calculated Mn2+ form factor and the magnetic moment is 1.78 μB/Mn.View full abstractDownload PDF (1024K) -
Hidemitsu Hayashi1982 Volume 51 Issue 3 Pages 811-817
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe direct transition from the γ-phase to the α-phase in CuI, the superionic transition, is studied in terms of the dependence of the free energy on the order parameter and temperature. The average structure of the α-phase is expressed by a microcrystalline model to take into account the Cu+–Cu+ Coulomb correlation. The formation energy of microcrystals is expressed as the surface energy, and calculated from the interionic interaction, which consists of Vashishta-Rahman’s potential and nearest neighbour covalent bond. Anharmonic vibration of Cu+ is described by Einstein model with cubic anharmonicity. The transition entropy comes from the configuration of microcrystals and increase of thermal vibration of Cu+ on a microcrystal surface. The calculated transition entropy and energy per ion pair are 1.4 kB and 0.11 eV, respectively, which are close to the observed values.View full abstractDownload PDF (880K) -
Hiroshi Miyazaki, Eiichi Hanamura1982 Volume 51 Issue 3 Pages 818-827
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSStochastic theory of the second order optical response is presented for a system of exciton-phonon complex. The emission spectrum due to the exciton is expressed with the tetradic propagators of the exciton-relevant mode system which dissipates energy into the reservoir of the remaining phonons. In this paper the multiple-scattering theory of the dynamical coherent potential approximation is developed for the tetradic propagators of the present non-Hamiltonian system. It is shown that the vertex correction associated with the tetradic propagator of the intermediate state in the second order optical process yields finite contribution to the luminescence component in the emission spectrum. The equations are obtained for the scattering t-matrices and the vertex corrections in terms of which the emission spectrum due to the exciton is evaluated.View full abstractDownload PDF (1292K) -
Hiroshi Miyazaki, Eiichi Hanamura1982 Volume 51 Issue 3 Pages 828-838
Published: March 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSFormula is presented to evaluate the second order optical response in the exciton-phonon complex with the aid of the multiple-scattering expansion of the tetradic propagators. The emission spectrum due to the exciton shows that the luminescence component is strongly influenced by the transfer of the exciton. The mobile nature of the exciton brings about the rapid relaxation of the exciton due to the interaction with the reservoir and reduces the intensity of the Raman component even in the case of the incident photon frequency Ω1 above the fundamental absorption edge. These weak Raman lines recover their intensity when Ω1 is chosen below the edge. It is suggested that the freedom of the choice of Ω1 is advantageous in investigating the competitive behavior of the Raman and the luminescence components in the emission spectrum.View full abstractDownload PDF (1344K) -
Noritaka Kuroda, Ichiro Munakata, Yuichiro Nishina1982 Volume 51 Issue 3 Pages 839-843
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe polarization dependence of the Raman scattering by LO phonons has been measured in the layer compound InSe under the experimental condition that photon energies of the scattered light are resonant with the A-exciton states. The Raman tensors of all lines have only xx and yy components, showing that the A-exciton transition is allowed for E⊥c but forbidden for E||c. This result gives an evidence for the “quasicubic” band model proposed previously by the present authors.View full abstractDownload PDF (740K) -
Michihiro Kobayashi, Shigeki Sawada, Shin-ichiro Narita1982 Volume 51 Issue 3 Pages 844-851
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSFar-Infrared absorption spectra of As- or Sb-doped germanium have been investigated at 1.5∼20 K. Spectral shape and its concentration dependence in Ge(As) show good agreement with the theoretical calculation based on a D− band model. Two types of thermally induced absorption are found in Ge(Sb). The first one shows an exponential dependence upon reciprocal absolute temperature and is ascribed to free carrier absorptions. The second one shows a different temperature dependence and is found to vanish under [111] uniaxial stress. These results give a direct evidence of the participation of a D− band in the optical transitions. An absorption peak ascribed to the transition from D1sD1s to D+D− in donor pairs is also found in the spectra of Ge(As) and Ge(Sb).View full abstractDownload PDF (1040K) -
Chiharu Takahashi, Minoru Fukui, Ryuji Abe1982 Volume 51 Issue 3 Pages 852-857
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSESR spectra of Cr3+ ions doped in RbH3(SeO3)2 were analysed in the paraelectric phase. The principal values and their direction cosines of D tensor were determined with D=−2800 gauss and E=−830 gauss. From the analysis of the D tensor, the doped site of Cr3+ ion and the vacant sites of H+ ions were determined. It has been also confirmed from the temperature dependences of ESR line shapes that for RbH3(SeO3)2 containing 0.1 mol% of Cr2(SO4)3·15H2O, an incommensurate phase is really existing above Tc.View full abstractDownload PDF (768K) -
Keishi Negita, Nobuo Nakamura, Hideaki Chihara1982 Volume 51 Issue 3 Pages 858-863
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSUltrasonic velocities in (NH4)2SnBr6 were measured as functions of temperature (157∼300 K) to investigate the nature of the structural phase transition at Tc1=157 K. It was found that among the elastic constants in the cubic phase (T>Tc1) Ce=(C11−C12)⁄2 and Ct=C44 become soft near Tc1 and the anomalous parts of them follow the relations ΔCe∝ln(T−Tc1) and ΔCt∝(T−Tc1)−1 above Tc1. The softening of these elastic constants was interpreted in terms of the electrostrictive type coupling between acoustic mode and the soft rotary mode of SnBr62− at the Γ point in the cubic Brillouin zone. Two dimensional correlations in the rotational motions of SnBr62− octahedra are suggested, which was proposed in SrTiO3.View full abstractDownload PDF (788K) -
Hironori Matsunaga1982 Volume 51 Issue 3 Pages 864-872
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe crystal structures of (NH4)2ZnCl4 at 418 K (Phase I), 333 K (Phase II) and 298 K (Phase III, antiferroelectric) were determined from X-ray diffraction data, and were compared with that at 223 K (Phase IV, ferroelectric). The space groups and final discrepancy factors are Pmcn and 0.052 at 418 K, Pc21n and 0.046 at 333 K and Pc11 and 0.050 at 298 K, respectively. The structure of Phase I belongs to the β-K2SO4 type structure and those of Phases II and III are modulated structures with the quadruple c axis of Phase I in contrast to that of Phase IV with the triple c axis. These modulated structures are characterized by slight rotation of the ZnCl4 groups from the positions in Phase I.View full abstractDownload PDF (1084K) -
Hironori Matsunaga1982 Volume 51 Issue 3 Pages 873-879
Published: March 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSThe crystal structure of (NH4)2ZnCl4 at 418 K (Phase I) was refined to R=0.037 by using a split atom model for Cl atoms, and the amplitudes of the static modulation waves at 333 K (Phase II), 298 K (Phase III) and 223 K (Phase IV) were estimated from the atomic coordinates. The structure obtained at 418 K suggests the disordering of the ZnCl4 group. It is found that half distances between the split atoms at 418 K correspond to expected amplitudes from the temperature dependence of the modulation waves in the lower temperature phases.View full abstractDownload PDF (708K) -
Yoshichika Onuki, Rumiko Inada, Sei-ichi Tanuma, Shoji Yamanaka, Hiros ...1982 Volume 51 Issue 3 Pages 880-887
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe reaction of TiS2, ZrSe2, HfSe2, 1T-TaS2 and VSe2 with the n-butyllithium in hexane solution has been done through the measurement of time dependent electrical resistivity and Hall coefficient. The semiconducting nature of TiS2, ZrSe2 and HfSe2 is converted into the metallic one by the lithium intercalation. The charge transfer rates from lithium atom to TiS2 and ZrSe2 bands are determined as 1.0 and 0.7, respectively from the chemical analyses and the Hall coefficients. The electrical resistivities of LixTiS2 (0.16≤x≤0.47) and LixZrSe2 (0.23≤x≤0.95) almost follow the Grüneisen’s relation for the metallic conductor. The low temperature resistivity of LixZrSe2 (x=0.49) shows a superconductivity below 1.7 K.View full abstractDownload PDF (1432K) -
Katsumi Tanimura, Tomoyuki Murakami, Noriaki Itoh1982 Volume 51 Issue 3 Pages 888-897
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe electronic structure and intersystem crossing at excited states of the relaxed exciton, (Vke)A, perturbed by monovalent cation impurity in KCl and KBr have been studied by pulsed laser irradiation of samples populated with the lowest triplet (Vke)A. It is found that the σ-polarized luminescence, at 3.03 eV and 2.93 eV in KCI: Na and KBr: Na, respectively, that decays in less than 10 ns is produced upon the photoexcitation of the lowest triplet (Vke)A. The fast luminescence is ascribed to the fluorescence (referred to as S1-luminescence) from the lowest singlet (Vke)A. The degree of polarization of the optical absorption due to the lowest triplet (Vke)A is determined and it is shown that the electron orbitals of (Vke)A are in the order of b2u, b3u, b1u and b3u* from lower energy. The S1 luminescence is found to be produced most efficiently by the electron excitation from the ag orbital to the b3u* orbital.View full abstractDownload PDF (1416K) -
Shin-ichiro Nagasaka1982 Volume 51 Issue 3 Pages 898-905
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe off-centre instability, the frequency of the resonant mode, the peak energy of the absorption band of the Cu+ impurity ion, and their lattice constant dependence have been calcuated using the CuCl6-cluster model in alkali chlorides, allowing for mixing between the ground state and a Cl−→Cu+ charge-transfer excitation state. The magnitude of the state mixing has been determined by using the experimental peak energy of the Cu+ band in LiCl and NaCl. The results can be compared favorably with experiments through all the alkali chlorides. As the lattice constant increases, the normal lattice site becomes unstable for the impurity ion, and the most stable off-centre position appears at first along the ⟨111⟩, then along the ⟨110⟩, and finally along the ⟨100⟩ axes.View full abstractDownload PDF (968K) -
Shik Shin, Shigemasa Suga, Masaki Taniguchi, Hiroshi Kanzaki, Satoru S ...1982 Volume 51 Issue 3 Pages 906-914
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAbsorption spectra resulting from the inner 3p-shell excitation of transition metal ions in halide compounds are measured in the photon energy range from 25 to 140 eV with synchrotron radiation from SOR–RING. The observed characteristic multiplet structures spreading over 10–20 eV are well explained by the localized excitation model for the 3p53dm+1 excited states, providing the evaluation of the final state interactions. The asymmetry of the absorption bands of the transition metal compounds with more than half-filled 3d-shell is interpreted as due to the interference caused by the super Coster-Kronig transition, in contrast to the rather symmetric and broad spectral line shape in the compounds with less than half-filled 3d-shell.View full abstractDownload PDF (1168K) -
Hidenao Sugawara, Akito Kakizaki, Ichiro Nagakura, Takehiko Ishii, Tak ...1982 Volume 51 Issue 3 Pages 915-921
Published: March 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSPhotoelectron spectra of CeB6 and PrB6 have been measured over the excitation-energy range from 30 to 140 eV. From the locations of the peaks which grow resonantly upon excitation in the giant absorption bands above the 4d thresholds of rare earths, the binding energies of 4f electrons in resonance are found to be 2.5 eV in CeB6 and 4.7 eV in PrB6. The shapes of energy distribution curves observed by excitation below resonance agree with the reported energy distribution curve of LaB6 and with the density-of-states curve calculated on LaB6 by the Xα–APW method. A sharp peak is resolved at the Fermi edge of CeB6. Its origin is discussed in relation to valence fluctuation.View full abstractDownload PDF (892K) -
Atsuo Kasuya, Yuichiro Nishina, Takenari Goto1982 Volume 51 Issue 3 Pages 922-928
Published: March 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSElectronic Raman scattering of shallow donors in cubic ZnSe has been studied for the incident photon energy in the vicinity of the n=2 free exciton level. Raman scattering intensities for 1s→2s and 1s→2p excitations of donor electrons are resonantly enhanced as the photon energy coincides with the excited states of exciton-neutral donor complex. Since these excited states are located within the continuous dispersion of free exciton state, the large enhancement in the Raman scattering intensity has been attributed to the mixing of these excited states with the free exciton state. The resonant behavior of the electronic Raman scattering shows that these excited states correspond to the lowest lying electronic excited states of the exciton neutral donor complex.View full abstractDownload PDF (868K) -
Coherent and Incoherent Mössbauer Scattering Observed by Using a Newly Designed γ-Ray DiffractometerYutaka Nakai, Minoru Hirano, Yoshiharu Ooi, Nobuhiko Kunitomi1982 Volume 51 Issue 3 Pages 929-936
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe measurement of Mössbauer scattering by an 57Fe foil has been performed by using a newly installed γ-ray diffractometer. At six resonance velocities, Bragg and off-Bragg scattering was observed for re-emitted 14.4 keV γ-rays. The former scattering is understood quantitatively by including the interference effect to Rayleigh scattering. The latter is explained as the contributions from recoil-free incoherent scattering, disorder scattering and incoherent inelastic scattering.View full abstractDownload PDF (928K) -
Yasuji Kashiwase, Yoshiro Kainuma, Masayuki Minoura1982 Volume 51 Issue 3 Pages 937-941
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSDips of the inelastic intensity profiles in 200, 400 and 600 Bragg reflections from a KCl crystal were observed by means of Mössbauer diffraction using 14.4 keV γ-rays and a position sensitive detector. It is concluded that the dips are caused by the thermal diffuse scattering of γ-rays which is reflected secondarily by the net planes in the same crystal.View full abstractDownload PDF (632K) -
Gen Matsumoto, Kazuyuki Aihara, Toshio Utsunomiya1982 Volume 51 Issue 3 Pages 942-950
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSIt was both theoretically and experimentally demonstrated that a spatially-ordered pacemaker generating action potentials at a constant rhythm was formed at a restricted region on the squid giant axon in the state of self-sustained oscillation of the action potentials. The dynamics of the Hodgkin-Huxley equations with one-dimensional diffusion were analysed to study the spatially-ordered pacemaker under the following conditions; (1) the rate constants of sodium activation and inactivation, and potassium activation changed with the effective calcium concentration in the external medium, according to Frankenhaeuser and Hodgkin (J. Physiol. 137 (1957) 218), and (2) the membrane potentials at both ends of the axon were fixed to be zero.
These experiments and calculation show that the repetitive firing state is spatially well organized and integrated, and that it could be called as the dissipative structure of Glansdorff and Prigogine macroscopicallyView full abstractDownload PDF (1100K) -
Hiroki Kitajima, Naohisa Wada, Hideo Suzuki1982 Volume 51 Issue 3 Pages 951-957
Published: March 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSWe assume such a model for rhodopsin chromophore that 11-cis PRSB interacts not only with its negative counter charge near N16+ but also with an ion-pair [COO−···X+] in the vicinity of CH3 on C9. And we calculate the optical absorptions of desmethyl analogues of rhodopsin in much the same way as the previous paper.
It is shown that the observed λmax’s of desmethyl analogues of rhodopsin can reasonably be explained by taking into account the structural change of PRSB and configurational change of [COO−···X+] due to the methyl substitution by hydrogen(s). It is also shown that the previous treatment of “partially-deprotonated” OH group is not fully appropriate to the present case of COOH since the degree of deprotonation is calculated to be as large as 0.4.View full abstractDownload PDF (720K) -
Eiko Hiroike1982 Volume 51 Issue 3 Pages 958-965
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSThe indirect dephasing model for a vibrating molecule in a dense medium is investigated by using the cumulant perturbation expansion method. The perturbation is taken as a sum of the anharmonic coupling between the high- and low-frequency modes and the interaction between the low-frequency mode and molecular surrounding. All the states of the low-frequency mode is taken into account in the calculation. Our model is available, only when the dephasing time of the high-frequency mode is shorter than the life-time of the low-frequency mode. This condition is satisfied in usual organic molecular crystals.View full abstractDownload PDF (756K) -
Makoto Yao, Hirohisa Endo1982 Volume 51 Issue 3 Pages 966-973
Published: March 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSSimultaneous measurements of the density and electrical conductivity have been carried out for expanded liquid Hg in the temperature and pressure range up to 1500°C and up to 2200 bar. At densities below 10 g/cm3 the temperature coefficient of the conductivity at constant volume increases appreciably with decreasing density. Anomalous behaviours are found in the thermodynamic properties such as equation-of-state and isothermal compressibility when the metallic Hg is transformed to a nonmetallic state. Structural changes in the metal-nonmetal transition range are discussed in connection with the observed thermodynamic properties.View full abstractDownload PDF (948K) -
Makoto Yao, Hirohisa Endo1982 Volume 51 Issue 3 Pages 974-982
Published: March 15, 1982
Released on J-STAGE: May 29, 2007
JOURNAL RESTRICTED ACCESSSimultaneous measurements of the density and electrical conductivity have been carried out for expanded liquid dilute amalgams containing Cd, Bi, Na, Pb etc. in the range of temperature and pressure up to 1550°C and 2200 bar. At high temperatures and pressures, substantial volume contraction and large increase in conductivity are brought about by the addition of a small amount of the elements with high-valency such as Bi and Pb into expanded liquid Hg. The observed large negative excess volume of mixing can be attributed to the loosely-packed structure of Hg solvent and to the change in the character of cohesion due to the injection of excess electrons.View full abstractDownload PDF (980K) -
Sanae-Inoue Itoh, Kimitaka Itoh, Yoshinosuke Terashima1982 Volume 51 Issue 3 Pages 983-987
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSAn energy principle is extended to include kinetic processes, finite gyroradius effects and wave-particle interactions, in electromagnetic instabilities in a toroidal plasma. The present arguments are based on the energy integrals which are derived from the eigenmode equations for electromagnetic perturbations. First, the finite gyroradius effects are included in the energy integral and it is shown that this integral can be used for determining the eigenmode by minimizing the excess energy of the perturbed state. The generalized stability conditions for kink-like mode and ballooning mode are obtained by use of this improved energy principle. For the case where wave-particle interaction is important, the energy integral becomes a rate equation of energy exchange, and a variational form can independently be constructed for the mode analysis.View full abstractDownload PDF (632K) -
Teruji Cho, Kouji Yamazaki, Shigetoshi Tanaka1982 Volume 51 Issue 3 Pages 988-995
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA density cavity was observed at the upper-hybrid resonance layer when a high-power microwave of the extraordinary mode was injected into an afterglow plasma column in a uniform magnetic field. Further, when the upper-hybrid resonance layer was at the center of the plasma column, the formation of the density cavity recurred and the microwave power transmitted through the plasma showed oscillatory behaviour. These results can be explained by the modulational instability at the upper-hybrid frequency and the formation of an upper-hybrid soliton.View full abstractDownload PDF (1076K) -
Kanemitsu Katou1982 Volume 51 Issue 3 Pages 996-1000
Published: March 15, 1982
Released on J-STAGE: June 01, 2007
JOURNAL RESTRICTED ACCESSA nonlinear mode-coupling equation which describes the three-dimensional wave dynamics in the weak electrostatic drift-wave turbulence is derived by means of a multiple scale expansion in time. This resonant interaction makes the drift-wave turbulence spectrum isotropic in the wavenumber plane perpendicular to an external uniform magnetic field. The mode-coupling coefficient for a resonant three-wave interaction posesses appropriate symmetries which ensure for the total wave energy-momentum density to be conserved during the interaction.View full abstractDownload PDF (484K)