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We have measured the energy and momentum dependent loss function of Li_2CuO_2single crystals by means of electron energy-loss spectroscopy in transmission.Using the same values for the model parameters, the low-energy features of thespectrum as well as published Cu 2p_(3/2) x-ray photoemission data of Li_2CuO_2are well described by a cluster model that consists of a single CuO_4 plaquetteonly. This demonstrates that charge excitations in Li_2CuO_2 are stronglylocalized.Comment: 5 pages, 5 figure

physical review. b, condensed matter

Dynamics of a hole in a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>plaquette: Electron energy-loss spectroscopy of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Li</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:…

Dynamics of a hole in aCuO4plaquette: Electron energy-loss spectroscopy ofLi2