Faculty Profiles - YOKOYA Takayoshi

MISC - YOKOYA Takayoshi

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3p-YJ-10 Momentum(k)-Dependence of Superconducting Gap in BI2212 Studied by High-Resolution Photoemission Spectroscopy

Yokoya T., Takahashi T., Mochiku T., Kadowaki K.

Abstracts of the meeting of the Physical Society of Japan. Annual meeting 51 ( 3 ) 535 - 535 1996.3

3p-YJ-11 Doping-Dependence of Fermi Surface Topology in Bi2212 Studied by Angle-Resolved Photoemission Spectroscopy

Campuzano J.C., Mochiku T., Kadowaki K.

Abstracts of the meeting of the Physical Society of Japan. Annual meeting 51 ( 3 ) 536 - 536 1996.3

31p-Z-7 High resolution photoemission study of metal-insulator transition of (MeBr-DCNQI)_2Cu

Akaki O, Chainani A, Kumigashira H, Yokoya T, Takahashi T, Kato R

Abstracts of the meeting of the Physical Society of Japan. Annual meeting 51 ( 2 ) 247 - 247 1996.3

31p-Z-12 High-Resolution Photoemission Spectroscopy of CeCu_6, CeB_6, and CeSi_x

Chiaia G, Takahashi T, Lindau I, Duo L, Rossi S.de, Yokoya T, Kunii S, Komatsubara T, Kohgi M

Abstracts of the meeting of the Physical Society of Japan. Annual meeting 51 ( 2 ) 250 - 250 1996.3

1p-C-12 Photoemission Spectroscopy of Yb_xC_<60>

Sumitani S., Akaki O., Yokoya T., Takahashi T.

Abstracts of the meeting of the Physical Society of Japan. Annual meeting 51 ( 2 ) 371 - 371 1996.3

31p-Z-5 Superconducting Gap in YBa_2Cu_3O_<7-δ> Observed by High-Resolution Photoemission Spectroscopy

Ding H, Campuzano J.C, Yokoya T, Claus H, Takahashi T

Abstracts of the meeting of the Physical Society of Japan. Annual meeting 51 ( 2 ) 246 - 246 1996.3

31p-Z-14 High-energy Resolution Photoemission Study of CeFeGe_3

Kumigashira H, Yang S.H, Chainani A, Akaki O, Yokoya T, Takahashi T, Sakai O, Yamamoto H, Ishikawa M

Abstracts of the meeting of the Physical Society of Japan. Annual meeting 51 ( 2 ) 251 - 251 1996.3

Angle-resolved photoemission study o

T. Yokoya, A. Chainani, T. Takahashi, H. Ding, J. Campuzano, H. Katayama-Yoshida, M. Kasai, Y. Tokura

Physical Review B - Condensed Matter and Materials Physics 54 ( 18 ) 13311 - 13318 1996

Language：English

We present high-resolution (HR) angle-resolved photoemission spectroscopy (ARPES) measurements of the noncuprate layered perovskite superconductor (Formula presented)(Formula presented). ARPES spectra of the whole valence-band region obtained along two high-symmetry directions in the Brillouin zone show clear dispersion, generally similar to that of a band calculation. However, HRARPES measurements taken in the vicinity of the Fermi level ((Formula presented)) show narrower Ru4dɛ(xy, yz, zx)-O2pπ antibonding bands than those predicted by the band calculation. More significantly, there is an extended van Hove singularity very close to (Formula presented) ((Formula presented)=11 meV) along the Ru-O bonding direction, which is known to exist in cuprate high-temperature superconductors. The Fermi-surface topology obtained by HRARPES (one electronlike Fermi surface sheet centered at the Γ point and two holelike sheets centered at the X point) is different from the band calculation (two electronlike sheets centered at the Γ point and one holelike sheet centered at the X point), although the electron count is the same in both cases. These results suggest that electron-electron correlations cause the modification of the Fermi-surface topology, and is thus necessary for understanding the electronic structure and properties of (Formula presented)(Formula presented). © 1996 The American Physical Society.

DOI： 10.1103/PhysRevB.54.13311

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27a-W-13 High-resolution photoemission spectroscopy of the Metal-insulator/CDW transition in deuterated DCNQI-Cu

Chainani A., Yokoya T., Takahashi T., Kato R.

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting 1995 ( 2 ) 229 - 229 1995.9

28a-W-9 High Resolution Photoemission Study of CeNiSi_2 and CePtSi_2

Kumigashira H., Chainani A., Yokoya T., Akaki O., Takahashi T., Ito M., Kasaya M., Sakai O

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting 1995 ( 2 ) 259 - 259 1995.9

28a-W-8 High-Resolution Angle Resolved Photoemission Study of CeBi

Kumigashira H., Yang S.-H., Yokoya T., Takahashi T., Uesawa A., Suzuki T.

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting 1995 ( 2 ) 259 - 259 1995.9

27a-W-9 High-resolution angle-resolved photoemission study of Sr_2RuO_4

Yokoya T., Chainani A., Takahashi T., Katayama-Yoshida H., Kasai M., Tokura Y.

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting 1995 ( 2 ) 227 - 227 1995.9

28a-K-10 Photoemission study of duterated(DMe-DCNQI[1, 1;0]_2Cu using synchrotron radiation

Yokoya T, A Chainani, Takahashi T, Mori T, Kato R

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting 1995 ( 2 ) 366 - 366 1995.9

28a-K-11 Photoemission spectroscopy of(DCNQI)_2Ag

A Chainani, Yokoya T, Takahashi T, Mori T

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting 1995 ( 2 ) 366 - 366 1995.9

28a-K-12 High-Resolution Photoemission Study of(DMe-DCNQI[1, 1;0]_2Cu

Takahashi T, Yokoya T, A Chainani, Tanaka A, Kumigashira H, Akaki O, Kato R

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting 1995 ( 2 ) 367 - 367 1995.9

Photoemission study of Bi_2CuO_4

Akaki O., Chainani A., Yokoya T., Takahashi T., Hosoya S.

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting 1995 ( 3 ) 435 - 435 1995.9

High-resolution photoemission spectroscopy of CeRu_2

Yang S.-H., Kumigashira H., Yokoya T., Chainani A., Takahashi T., Takeya H., Kadowaki K.

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting 1995 ( 3 ) 217 - 217 1995.9

X-rey absorption spectroscopy of metal-insulator transition of CeTiOx

Akaki O., Yokoya T., Chainani A., Takahashi T., Onoda M.

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting 1995 ( 3 ) 178 - 178 1995.9

High-resolution photoemission spectroscopy of UNi_2Al_3 and URu_2Si_2

Yang S.-H., Kumigashira H., Yokoya T., Chainani A., Takahashi T., Sato N., Komatsubara T.

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting 1995 ( 3 ) 79 - 79 1995.9

High-resolution photoemission spectroscopy of CeSn_3 and CeIn_3

Chainani A., Kumigashira H., Yokoya T., Takahashi T., Kasaya M.

Abstracts of the meeting of the Physical Society of Japan. Sectional meeting 1995 ( 3 ) 75 - 75 1995.9

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