Molecular orbital excitations in cuprates

Details Molecular orbital excitations in cuprates Molecular orbital excitations in cuprates

2004-07-07

arxiv.org/abs/cond-mat/0407179v1

Phys. Rev. B 70, 205128 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 3 figures

Scientific paper

10.1103/PhysRevB.70.205128

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 t_pd is much stronger than that expected from tight-binding theory.

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