Phys. Rev. B 70, 205128 (2004) [5 pages]Molecular orbital excitations in cuprates: Resonant inelastic x-ray scattering studiesReceived 7 July 2004; published 24 November 2004 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. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.70.205128
DOI:
10.1103/PhysRevB.70.205128
PACS:
74.25.Jb, 74.72.−h, 78.70.Ck, 71.27.+a
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