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- Proceedings of the Physico-Mathematical Society of Japan. 3rd Series
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Volume 64, Issue 7
Displaying 51-68 of 68 articles from this issue
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Yasushi Shiina, Daisuke Shimada, Akiko Mottate, Yasuyuki Ohyagi, Nobuo ...Subject area: Superconductivity.
1995 Volume 64 Issue 7 Pages 2577-2584
Published: July 01, 1995
Released on J-STAGE: October 01, 1999
JOURNAL RESTRICTED ACCESSTemperature dependence of the tunneling conductance of a Bi2Sr2CaCu2O8--GaAs junction was investigated both experimentally and theoretically. The spectral function deduced from the experimental result at 4.2, K is applied to the Eliashberg equations at higher temperatures. The theory well explains the observed smearing of the phonon structures, but there is a small discrepancy between the experimental and the theoretical gap and the former decreases more rapidly than the latter as temperature increases.View full abstractDownload PDF (418K) -
Hideki Ushio, Hiroshi KamimuraSubject area: Superconductivity.
1995 Volume 64 Issue 7 Pages 2585-2593
Published: July 01, 1995
Released on J-STAGE: October 01, 1999
JOURNAL RESTRICTED ACCESSWe have derived the effective one-electron-type band structure, the density of states and the Fermi surface structure for a carrier system, by renormalizing the effects of the supper-exchange coupling between localized spins, the exchange integral between the spins of a carrier hole and a localized spin, and the Hubbard U-like parameter of a carrier hole into the electronic state of the carriers. The obtained energy bands and Fermi surface structure are consistent with the recent experimental results of angle-resolved photoemission.View full abstractDownload PDF (570K) -
Yasutomo Arai, Yoshiyuki Shirakawa, Shigeru Tamaki, Masayoshi AzumaSubject area: Magnetic properties and materials.
1995 Volume 64 Issue 7 Pages 2594-2599
Published: July 01, 1995
Released on J-STAGE: October 01, 1999
JOURNAL RESTRICTED ACCESSThe magnetic susceptibilities of liquid Ag--In, Ag--Sn, Ag--Ga and Ag--Zn alloy systems have been measured over a wide temperature range from 600 to 1085°C. The magnetic susceptibility curves at 1010°C were plotted against the alloy composition, which are different from one another. The temperature coefficients of their magnetic susceptibilities against the composition were very similar, showing a sharp minimum at about 90 at%Ag and a broad maximum at about 70 at%Ag, except for those of the Ag--Zn system. The curve of the concentration-concentration fluctuation in the long wavelength limit SCC(0) of those alloys has been estimated by using the experimental EMF data compiled in the literatures. Two pronounced minima exist in the SCC(0) curves at about 35 and 70 at%Ag, except for the Ag--Ga system.View full abstractDownload PDF (322K) -
Hideya Ikoma, Masanori Matoba, Mitsuo Mikami, Shuichiro AnzaiSubject area: Magnetic properties and materials.
1995 Volume 64 Issue 7 Pages 2600-2608
Published: July 01, 1995
Released on J-STAGE: October 01, 1999
JOURNAL RESTRICTED ACCESSWe report the following two remarks of the Rh impurity effect on the charge-transfer (CT) type nonmetallic state (below the nonmetal-metal transition temperature: Tt) of 3d transition metal compound NiS. (1) Although the nearest neighbouring M-M (Ni or Rh) and S-S distances increase with increasing x, dTt/dx<0. The Rh substitution gives a broad peak with the Fermi edge. A positive sign of T-linear contribution of the thermoelectric power turns to negative one at the critical concentration (xc) in Ni1-xRhxS. Below Tt, a Curie constant is observed and increases with increasing x. It is suggested that an impurity band introduced by the Rh atoms leads a change of the electronic state of Ni atoms and the suppression of the CT gap. (2) An empirical relation (dTt/d| CN| >0) is found on Ni1-xRhxS, Ni1-δ S and NiS1-ySe_y, where CN is the phonon-drag coefficient. The slope dTt/d| CN| becomes smaller in Ni1-xMxS with the early 3d transition metal impurities (M: Ti, V and Cr).View full abstractDownload PDF (538K) -
Tatsuo C. Kobayashi, Hajime Honda, Akihiro Koda, Kiichi AmayaSubject area: Magnetic properties and materials.
1995 Volume 64 Issue 7 Pages 2609-2613
Published: July 01, 1995
Released on J-STAGE: October 01, 1999
JOURNAL RESTRICTED ACCESSEffects of Cu-impurity are studied by heat capacity and susceptibility measurements down to 30, mK on the Haldane-gap antiferromagnet Ni(C2H8N2)2NO2(ClO4) (NENP). We have observed the characteristic heat capacity and susceptibility which show contributions from free spins of the Cu2+-impurities with S=1/2 and the fractional spin S=1/2 states at the ends of the Ni2+(S=1)-chain adjacent to the Cu2+-impurities. The present results are explained completely by the phenomenological Hamiltonian for a trimmer of S=1/2 proposed by the ESR study on this system.View full abstractDownload PDF (317K) -
Ko Sugihara, Atsuko Nakayama, Toshiaki EnokiSubject area: Magnetics resonances and relaxations in condensed matter; MÖssbauer effect.
1995 Volume 64 Issue 7 Pages 2614-2620
Published: July 01, 1995
Released on J-STAGE: October 01, 1999
JOURNAL RESTRICTED ACCESSMicroporous activated carbon fibers with huge specific surface area (3000, m2/g) have dangling bond spins at the peripheries of micro-graphitic domains. Spin-lattice relaxation of the dangling bond spins was studied by ESR measurements in the presence of various gases, He, Ne, Ar, H2, N2, O2. The introduction of helium gas strongly enhances the spin-lattice relaxation rate 1/T1, suggesting the contribution of the collisional process to the spin-lattice relaxation mechanism. The introduction of a simple model on the basis of the electric dipole-dipole interaction makes the calculation of 1/T1 possible and the obtained result can explain the experimentally observed result.View full abstractDownload PDF (311K) -
Midori Tanaka, Etsuko Himoto, Yoshiei TodateSubject area: Magnetics resonances and relaxations in condensed matter; MÖssbauer effect.
1995 Volume 64 Issue 7 Pages 2621-2627
Published: July 01, 1995
Released on J-STAGE: October 01, 1999
JOURNAL RESTRICTED ACCESSMössbauer study of 57Fe of a single crystal LuFeMgO4, a diluted triangular antiferromagnet, reveals two kinds of spin behavior, a weakly frustrated and a strongly frustrated ones. One kind of spin aligns along the c-axis with antiferromagnetic correlation and contributes to an almost constant Hhf at temperatures below Tcusp (spin glass like transition temperature), while the other behaves like a Heisenberg spin in a triangular antiferromagnet rapidly fluctuating with 120° structure, and contributes to a slightly smaller and temperature dependent Hhf. This behavior is explained in relation to the magnetic properties.View full abstractDownload PDF (409K) -
Tetsuo Ohama, Hiroshi Yasuoka, D. Mandrus, Z. Fisk, J. L. SmithSubject area: Magnetics resonances and relaxations in condensed matter; MÖssbauer effect.
1995 Volume 64 Issue 7 Pages 2628-2635
Published: July 01, 1995
Released on J-STAGE: October 01, 1999
JOURNAL RESTRICTED ACCESSThe magnetic susceptibility and the Cu and Si Knight shifts have been measured in CeCu2Si2. The transferred hyperfine couplings at both the sites are strongly temperature-dependent and noticeably anisotropic at low temperatures. The negative hyperfine couplings observed for the magnetic field along the c-axis at the low temperatures are anomalous as in Ce intermetallic compounds. It is pointed out that the transferred hyperfine coupling due to the hybridization of the f electrons with the ligand s electrons can be anisotropic and also can reverse its sign at the lower temperatures than the crystal-field splitting energy. It is concluded that this hybridization is the dominant mechanism of the transferred hyperfine coupling and responsible for the anomaly.View full abstractDownload PDF (458K) -
J. K. Das, S. K. Dash, B. B. SwainSubject area: Dielectric properties and materials.
1995 Volume 64 Issue 7 Pages 2636-2641
Published: July 01, 1995
Released on J-STAGE: October 01, 1999
JOURNAL RESTRICTED ACCESSDielectric constant of binary mixtures of Methyl isobutyl Ketone (MIBK) with a number of aliphatic alcohols, namely 1-propanol, 1-butanol, 1-pentanol, 1-hexanol, 1-heptanol and 1-octanol has been measured at 303.16, K and 455, kHz. The data are used to compute the mutual correlation parameter gab, excess molar polarization ΔP, and excess Gibb's free energy ΔG in those mixtures with a view to assessing the suitability of the alcohol as a modifier. The trend of variation of gab indicates that octanol could be grouped with other higher alcohols already used as modifier.View full abstractDownload PDF (260K) -
Masaki Maeda, Koichi Honda, Ikuo SuzukiSubject area: Dielectric properties and materials.
1995 Volume 64 Issue 7 Pages 2642-2649
Published: July 01, 1995
Released on J-STAGE: October 01, 1999
JOURNAL RESTRICTED ACCESSDielectric, elastic and piezoelectric properties of the mixed crystals system, Na[K1-x(NH4)x]C4H4O6· 4H2O (0.90View full abstractDownload PDF (415K) -
Kazuo Gesi, Makoto Iwata, Yoshihiro IshibashiSubject area: Dielectric properties and materials.
1995 Volume 64 Issue 7 Pages 2650-2655
Published: July 01, 1995
Released on J-STAGE: October 01, 1999
JOURNAL RESTRICTED ACCESSEffect of hydrostatic pressure on the phase transitions and dielectric anomalies has been studied for ferroelectric (CH3NH3)5Bi2Cl11 (MAPCB) and (CH3NH3)5Bi2Br11 (MAPBB) in a pressure range up to about 650, MPa. The Curie temperatures Tc (311, K in MAPCB, 307, K in MAPBB at 0, MPa) increase with increasing pressure with initial pressure coefficients (dTc/dp)_{p=0} of 0.063, K/MPa and 0.060, K/MPa for MAPCB and MAPBB, respectively. In MAPCB, the temperature at which the dielectric constant shows a diffuse anomaly (around 160, K at 0, MPa) increases linearly with increasing pressure with a rate of 0.057, K/MPa. The dielectric anomaly becomes more and more diffusive as pressure increases.View full abstractDownload PDF (343K) -
Eiichi Yamaguchi, Mahesh R. JunnarkarSubject area: Optical properties and condensedmatter spectroscopy and other interactions of matter with particles and radiation.
1995 Volume 64 Issue 7 Pages 2656-2668
Published: July 01, 1995
Released on J-STAGE: October 01, 1999
JOURNAL RESTRICTED ACCESSWe have discovered a new type of photoluminescence (PL) effect in Si-doped AlxGa1-xAs and their microstructures including double δ -doped systems and superlattices. This PL appears with photon energies higher than the incident photon energy at low temperatures. Specifically, the photoexcitation with the energy being 0.2, eV below the gap energy produces the band-edge PL for AlxGa1-xAs (0.35≤ x≤ 0.40). Neither the Anti-Stokes Raman effect, the Franz-Keldish effect nor the multiple photon effect have been proven to cause the present anomalous phenomena. Various studies of this luminescence as functions of temperature, Si concentration, the excitation power intensity and the excitation energy have revealed that this effect is strongly related to the deep donor levels in AlxGa1-xAs (x≥ 0.3). We have discussed a possible origin of this new phenomena.View full abstractDownload PDF (847K) -
Takashi Ikeda, Yoshihiro Ohmura, Hirohide Nakamatsu, Takeshi MukoyamaSubject area: Optical properties and condensedmatter spectroscopy and other interactions of matter with particles and radiation.
1995 Volume 64 Issue 7 Pages 2669-2676
Published: July 01, 1995
Released on J-STAGE: October 01, 1999
JOURNAL RESTRICTED ACCESSThe discrete variational (DV) Xα method is applied to investigate the outermost inner-shell hole of all alkali metals. Calculations are performed for the model clusters M9 and M59 of alkali metals. The hole is assumed to be at the center of the cluster in the bcc structure. The hole potential of Rb and Cs is found to be extended to the cluster size. The result is applied to investigate the anomalous edge of X-ray absorption spectrum and the asymmetric shape of X-ray photoemission spectrum, but we could not find any peculiar characteristics expected for Cs. The obtained singularity indices α 's and the edge exponents α l's of all the elements are very similar to those obtained by predecessors, failing to obtain a small value of α 0 for Cs which is claimed by experiment.View full abstractDownload PDF (587K) -
Takashi IkedaSubject area: Optical properties and condensedmatter spectroscopy and other interactions of matter with particles and radiation.
1995 Volume 64 Issue 7 Pages 2677-2683
Published: July 01, 1995
Released on J-STAGE: October 01, 1999
JOURNAL RESTRICTED ACCESSThe discrete variational (DV) Xα method is applied to investigate the electronic structure of alkali metals. The structure of energy levels of large cluster has a similarity to the density-of-states of metallic system of the same elements if the contribution of surface atoms is removed. Decomposition of the density-of-states at the Fermi energy into the partial waves shows strong p character for Li, nearly equal s and p contributions for Na and nearly equal s, p and d components for K, Rb and Cs. The calculated density-of-states is compared favorably with X-ray absorption spectrum of K, Rb and Cs. The effect of the d state near the edge of X-ray absorption spectrum is found serious, in particular for Cs.View full abstractDownload PDF (402K) -
Hiroshi Amekura, Taizo MasumiSubject area: Optical properties and condensedmatter spectroscopy and other interactions of matter with particles and radiation.
1995 Volume 64 Issue 7 Pages 2684-2696
Published: July 01, 1995
Released on J-STAGE: October 01, 1999
JOURNAL RESTRICTED ACCESSWe reported previously a series of unexpected emergences with anomalies of transient photoconductivity Q(T, , λ ) of Cu2O below 100, K with decreasing temperature in contrast to the submergences of Q(T, , λ ) observed in most of normal photoconductor such as AgCl, AgBr, CdS at low temperatures. Here, we have reexamined the temperature variation of effective electric fields applied on the specimens of Cu2O, both experimentally and numerically in detail. By estimating an influence of the effective electric fields on the magnitude of Q(T, , λ ), we obtained further corrected results of Q(T, , λ ) qualitatively common to various Cu2O specimens below 100, K. These corrections established the overall behaviours of the “anomalous temperature dependence'' of Q(T, , λ ) of Cu2O previously reported especially below 100, K to be not influenced by a spurious effect. We give further discussion on the phenomena in terms of the mobility μ (T) and/or of the life time τ (T) due to usual trapping processes of photocarriers based on the one-electron approximation, but without success. Here, we note a finite value of photocarrier density n0, sustained even down to T=1.6, K. We eventually have to invoke a many-body aspect in elucidating these anomalous phenomena of Q(T, , λ ) and n0(T) observed in Cu2O.View full abstractDownload PDF (828K) -
Juan J. García–EscuderoSubject area: Mathematical methods in physics.
1995 Volume 64 Issue 7 Pages 2697-2698
Published: July 01, 1995
Released on J-STAGE: October 01, 1999
JOURNAL RESTRICTED ACCESSDownload PDF (120K) -
P. K. Choudhury, P. Khastgir, S. P. OjhaSubject area: Electricity and magnetism: fields and charged particles.
1995 Volume 64 Issue 7 Pages 2699-2700
Published: July 01, 1995
Released on J-STAGE: October 01, 1999
JOURNAL RESTRICTED ACCESSDownload PDF (78K) -
Shinji Sasaki, Naoyuki Narita, Isao YamadaSubject area: Magnetic properties and materials.
1995 Volume 64 Issue 7 Pages 2701-2702
Published: July 01, 1995
Released on J-STAGE: October 01, 1999
JOURNAL RESTRICTED ACCESSDownload PDF (141K)