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The dynamics of a hole in a CuO_4 plaquette: electron energy-loss spectroscopy of Li_2CuO_2

S. Atzkern·M. Knupfer·M. S. Golden·J. Fink·C. Waidacher·J. Richter·K. W. Becker·N. Motoyama·H. Eisaki·S. Uchida
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Abstract

We have measured the energy and momentum dependent loss function of Li_2CuO_2 single crystals by means of electron energy-loss spectroscopy in transmission. Using the same values for the model parameters, the low-energy features of the spectrum as well as published Cu 2p_(3/2) x-ray photoemission data of Li_2CuO_2 are well described by a cluster model that consists of a single CuO_4 plaquette only. This demonstrates that charge excitations in Li_2CuO_2 are strongly localized.

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S. Atzkern, M. Knupfer, M. S. Golden, J. Fink, C. Waidacher, J. Richter, K. W. Becker, N. Motoyama, H. Eisaki, S. Uchida. 2000-07-13. The dynamics of a hole in a CuO_4 plaquette: electron energy-loss spectroscopy of Li_2CuO_2. https://doi.org/10.1103/physrevb.62.7845

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