The dynamics of a hole in a CuO4 plaquette: electron energy-loss spectroscopy of Li2CuO2
Abstract
We have measured the energy and momentum dependent loss function of Li2CuO2 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 Li2CuO2 are well described by a cluster model that consists of a single CuO4 plaquette only. This demonstrates that charge excitations in Li2CuO2 are strongly localized.
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