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

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arxiv cond-mat/0007227 v1 pith:UJRDLMXC submitted 2000-07-13 cond-mat

S. Atzkern , M. Knupfer , M. S. Golden , J. Fink , C. Waidacher , J. Richter , K. W. Becker , N. Motoyama
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H. Eisaki S. Uchida
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classification cond-mat
keywords electronenergy-lossmodelplaquettesinglespectroscopywellcharge
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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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