Published Papers - KISODA Kenji

Stage dependence of phonons in misfit layer compounds (MS)(NbS2)(n) (M=Sn,Pb; n=1,2)

M Hangyo, K Kisoda, S Nakashima, A Meerschaut, J Rouxel

PHYSICA B-CONDENSED MATTER ( ELSEVIER SCIENCE BV )  219-20   481 - 483   1996.04

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Misfit layer compounds (MS)(NbS2)(n) (M = Sn,Pb; n = 1, 2) are composed of two types of layers MS and NbS2. Raman spectra of these compounds have been measured for stage-1 (n = 1) and stage-2 (n = 2) compounds and compared with those of pristine NbS2 and other misfit layer compounds. The intralayer E modes of the NbS2 layer for (MS)(NbS2)(n) shifts upwards relative to 2H- and 3R-NbS2 and the amount of the shift is larger for the stage-1 compounds than the stage-2 compounds. This result is interpreted in terms of the charge transfer (CT) from the MS layer to the NbS, layer. The extra phonon modes observed for (RS)(NbS)(2) (R = La,Ce) which become Raman active by the breakdown of the mirror symmetry of the NbS2 layer are not observed for (PbS)(NbS2)(2) because the amount of CT is considerably smaller for the Pb compounds than the La and Ce compounds.

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RAMAN-SCATTERING FROM MISFIT LAYER COMPOUNDS (RS),XTAS2(R-EQUIVALENT-TO-LA, CE, SM OR GD, S-EQUIVALENT-TO-SULFUR, X-SIMILAR-OR-EQUAL-TO-1.2)

K KISODA, M HANGYO, S NAKASHIMA, K SUZUKI, T ENOKI, Y OHNO

JOURNAL OF PHYSICS-CONDENSED MATTER ( IOP PUBLISHING LTD )  7 ( 27 ) 5383 - 5393   1995.07

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Polarized Raman scattering experiments on misfit layer compounds (RS)(x)TaS2 (R = La, Ce, Sm or Gd; S = sulphur; x similar or equal to 1.2) have been carried out in order to investigate the effect of the charge transfer (CT) from an RS layer to a TaS2 layer on the vibrational motion. The mode assignment is made by comparing the spectra of(RS)xTaS(2) with those of 2H-TaS2 and (RS)(x)NbS2. The modes at frequencies below about 200 cm(-1) are ascribed to the intralayer modes of the RS layer and the main peaks higher than 200 cm(-1) are ascribed to the intralayer modes of the TaS2 layer. The E mode relevant to the TaS2 layer shifts upwards by about 40 cm-1 relative to the corresponding mode in 2H-TaS2 while the A mode hardly shifts. In addition to the intralayer modes of each layer, extra modes which show an anisotropy in the basal plane are observed at 360-370 cm(-1). These observations indicate that the restoring forces for intralayer and interlayer interactions strengthen owing to the CT. The two-phonon Raman band is observed at higher frequencies than that of 2H-TaS2. The comparison with the spectra of (RS)(x)NbS2 shows that the amount of the CT in (RS)(x)TaS2 is less than that in (RS)(x)NbS2.

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LOW-FREQUENCY RAMAN SPECTRA OF(BiPb)₂Sr₂CaCu₂O₈

M. Hangyo, K. Kisoda, T. Nagashima, Y. Murakami, S. Nakashima, Y. Kikuchi, J. Shirafuji

Advances in Superconductivity IV   IV   173 - 176   1995

Raman scattering from misfit layer compounds (RS)xTaS2 (R identical to La,Ce,Sm or Gd; S identical to sulphur; X approximately=1.2)

K. Kisoda, M. Hangyo, S. Nakashima, K. Suzuki, T. Enoki, Y. Ohno

Journal of Physics: Condensed Matter   7 ( 27 ) 5383 - 5393   1995  [Refereed]

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Polarized Raman scattering experiments on misfit layer compounds (RS)xTaS2 (R identical to La, Ce, Sm or Gd
S identical to sulphur
x approximately=1.2) have been carried out in order to investigate the effect of the charge transfer (CT) from an RS layer to a TaS2 layer on the vibrational motion. The mode assignment is made by comparing the spectra of (RS)xTaS2 with those of 2H-TaS2 and (RS)xNbS2. The modes at frequencies below about 200 cm-1 are ascribed to the intralayer modes of the RS layer and the main peaks higher than 200 cm-1 are ascribed to the intralayer modes of the TaS2 layer. The E mode relevant to the TaS2 layer shifts upwards by about 40 cm-1 relative to the corresponding mode in 2H-TaS2 while the A mode hardly shifts. In addition to the intralayer modes of each layer, extra modes which show an anisotropy in the basal plane are observed at 360-370 cm-1. These observations indicate that the restoring forces for intralayer and interlayer interactions strengthen owing to the CT. The two-phonon Raman band is observed at higher frequencies than that of 2H-TaS2. The comparison with the spectra of (RS)xNbS2 shows that the amount of the CT in (RS)xTaS2 is less than that in (RS)xNbS2.

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STAGING AND INTERLAYER INTERACTION IN THE MISFIT-LAYER COMPOUNDS (RS)(N)NBS2 (R=LA,CE, N=0.6, 1.2) STUDIED BY RAMAN AND INFRARED SPECTROSCOPIES

M HANGYO, K KISODA, T NISHIO, S NAKASHIMA, T TERASHIMA, N KOJIMA

PHYSICAL REVIEW B ( AMERICAN PHYSICAL SOC )  50 ( 16 ) 12033 - 12043   1994.10

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RAMAN DETERMINATION OF STRUCTURES OF LONG-PERIOD SIC POLYTYPES

S NAKASHIMA, K KISODA, JP GAUTHIER

JOURNAL OF APPLIED PHYSICS ( AMER INST PHYSICS )  75 ( 10 ) 5354 - 5360   1994.05

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Raman spectroscopy has been applied to identification of longer-period SiC polytypes. The stacking structures of 5 1 R and 1 3 2R polytypes have been examined, the result of which is consistent with electron- and x-ray-diffraction analyses. The possibility is discussed for Raman determination of the period and stacking structure of longer period polytypes. It is demonstrated that Raman scattering is useful for the determination of the structure of SiC polytypes.

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JOSEPHSON EFFECT AND CRITICAL CURRENT BY FERMION PAIRING IN REAL SPACE AND HIGH-TC OXIDE SUPERCONDUCTORS

S TAKENO, K KISODA

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN ( PHYSICAL SOCIETY JAPAN )  57 ( 7 ) 2257 - 2260   1988.07

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APPROXIMATE SOLITON-SOLUTIONS AROUND AN EXACT SOLITON SOLUTION OF THE TODA LATTICE EQUATION

S TAKENO, K KISODA, S HOMMA

PHYSICS LETTERS A ( ELSEVIER SCIENCE BV )  130 ( 4-5 ) 279 - 282   1988.07

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SELF-SUSTAINED KINKS IN A ONE-DIMENSIONAL NONLINEAR LATTICE WITH DISSIPATION

S TAKENO, K KISODA

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN ( PHYSICAL SOCIETY JAPAN )  57 ( 3 ) 675 - 678   1988.03

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INTRINSIC LOCALIZED VIBRATIONAL-MODES IN ANHARMONIC CRYSTALS - STATIONARY MODES

S TAKENO, K KISODA, AJ SIEVERS

PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT ( PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE )  ( 94 ) 242 - 269   1988

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SUPERCONDUCTIVITY BY FERMION PAIRING IN REAL SPACE AND THE PHYSICAL-PROPERTIES OF HIGH-TC OXIDE SUPERCONDUCTORS

S TAKENO, K KISODA

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS ( JAPAN SOC APPLIED PHYSICS )  26 ( 11 ) L1912 - L1914   1987.11

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