Faculty Profiles - YOKOYA Takayoshi

MISC - YOKOYA Takayoshi

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28p-H-7 High-energy resolution angle-resolved photoemission study of high-Tc Superconductor

Yokoya Takayoshi, Takahashi Takashi

Abstracts of the meeting of the Physical Society of Japan. Annual meeting 49 ( 2 ) 189 - 189 1994.3

28p-H-2 High-Resolution Photoemission Spectoroscopy of CeSi_x; Temperature Dependence

Morimoto T, Yokoya T, Takahashi T, Sato S, Kohgi M, Satoh T

Abstracts of the meeting of the Physical Society of Japan. Annual meeting 49 ( 2 ) 186 - 186 1994.3

30p-WB-6 Observation of Superconducting Gap Anisotropy in Bi2212 by Angle-Resolved Phtoemission Spectroscopy

Yokoya T, Takahashi T

Abstracts of the meeting of the Physical Society of Japan. Annual meeting 49 ( 3 ) 411 - 411 1994.3

High-energy-resolution photoemission study of single-crystal CeSix (x=1.86 and 1.7): A test of the Kondo model

T. Takahashi, T. Morimoto, T. Yokoya, M. Kohgi, T. Satoh

Physical Review B 49 ( 22 ) 15688 - 15691 1994

Language：English

Photoemission spectra of single crystal CeSix (x=1.86
nonmagnetic, TK∼20 K, and x=1.7
ferromagnetic, Tc=13.7 K) were measured at very high-energy resolution and low temperature. The Fermi-edge band in the photoemission spectrum of CeSi1.86 is narrower and closer to EF compared with the previous reports on polycrystals, showing closer resemblance to the calculation based on the Kondo model. The intensity of the Fermi-level peak is drastically reduced in going from CeSi1.86 to CeSi1.7, which is in good qualitative agreement with the Kondo model. © 1994 The American Physical Society.

DOI： 10.1103/PhysRevB.49.15688

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13p-B-7 High-Energy Resolution Low-Temperature Photoemission Spetroscopy of Cs_xC_<60>

Morimoto Takayuki, Yokoya Takayoshi, Takahashi Takashi

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting 1993 ( 2 ) 376 - 376 1993.9

12a-DC-15 Low Temperature and High-Resolution Photoemission Spectroscopy of Ce Compounds

Morimoto T., Yokoya T., Takahashi T., Sato S., Kohgi M., Sato T., Suzuki T.

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting 1993 ( 2 ) 217 - 217 1993.9

12a-DC-12 High energy resolution photoemission spectroscopy of Au : Temperature effects

Yokoya T., Morimoto T., Takahashi T., Sato S.

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting 1993 ( 2 ) 215 - 215 1993.9

30a-W-13 Direct Observation of the Superconducting Energy Gap by High-Resolution Photoemission Spectroscopy (II)

Yokoya T., Takahashi T., Morikawa T., Yoshida H., Sato S., Fujiwara A., Noji T., Koike Y., Saito Y.

Abstracts of the meeting of the Physical Society of Japan. Annual meeting 48 ( 3 ) 288 - 288 1993.3

29a-P-13 Low Temperature and High-Resolution Photoemission Spectroscopy of Ce Compounds

Morimoto T., Yokoya T., Takahashi T., Sato S., Kunii S., Suzuki T.

Abstracts of the meeting of the Physical Society of Japan. Annual meeting 48 ( 2 ) 208 - 208 1993.3

Superconducting energy gap in Bi2Sr2CaCu2O8 observed by high-resolution photoemission spectroscopy

Takayoshi Yokoya, Takashi Takahashi, Akihiko Fujiwara, Yoji Koike

Solid State Communications 87 ( 6 ) 553 - 556 1993

Language：English

A high-energy resolved low-temperature photoemission spectrometer of angle-integrated mode was constructed to study the detailed electronic structure near the Fermi level of novel materials, in particular, cuprate high-Tc superconductors. Photoemission measurement with this spectrometer on a Bi2Sr2CaCu2O8 polycrystal clearly showed a transfer of spectral weight from the vicinity of the Fermi level to the higher binding-energy region below the superconducting transition temperature, indicating opening of the superconducting gap. Numerical simulation for both normal and superconducting states showed that the superconducting gap parameter (Δ) of 18 meV with dx2-y2 symmetry gives a most reasonable fitting. © 1993.

DOI： 10.1016/0038-1098(93)90595-E

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28p-Q-13 Direct Observation of the Superconducting Energy Gap by High-Resolution Photoemission Spectroscopy

Yokoya T, Takahashi T, Morikawa T, Sato S, Fujiwara A, Noji T, Koike Y, Saito Y

1992 ( 3 ) 428 - 428 1992.9

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MISC - YOKOYA Takayoshi