Molecular orbital excitations in cuprates: Resonant inelastic x-ray scattering studies

Young-June Kim, J. P. Hill, G. D. Gu, F. C. Chou, S. Wakimoto, R. J. Birgeneau, Seiki Komiya, Yoichi Ando, N. Motoyama, K. M. Kojima, S. Uchida, D. Casa, and T. Gog
Phys. Rev. B 70, 205128 – Published 24 November 2004

Abstract

We report resonant inelastic x-ray scattering studies of electronic excitations in a wide variety of cuprate compounds. Specifically, we focus on the charge-transfer type excitation of an electron from a bonding molecular orbital to an antibonding molecular orbital in a copper oxygen plaquette. Both the excitation energy and the amount of dispersion are found to increase significantly as the copper oxygen bond length is reduced. We also find that the estimated bond-length dependence of the hopping integral tpd is much stronger than that expected from tight-binding theory.

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  • Received 7 July 2004

DOI:https://doi.org/10.1103/PhysRevB.70.205128

©2004 American Physical Society

Authors & Affiliations

Young-June Kim, J. P. Hill, and G. D. Gu

  • Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA

F. C. Chou

  • Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

S. Wakimoto and R. J. Birgeneau

  • Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7

Seiki Komiya and Yoichi Ando

  • Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511, Japan

N. Motoyama, K. M. Kojima, and S. Uchida

  • Graduate School of Frontier Sciences, University of Tokyo, Bunkyo, Tokyo 113-8656, Japan

D. Casa and T. Gog

  • CMC-CAT, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA

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Issue

Vol. 70, Iss. 20 — 15 November 2004

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