Electronic Structure of Nd<SUB>2−<I>x</I></SUB>Ce<I><SUB>x</SUB></I>CuO<SUB>4</SUB> and La<SUB>2−<I>x</I></SUB>Sr<I><SUB>x</SUB></I>CuO<SUB>4</SUB> Deduced from Cu 2<I>p</I> Photoemission and Photoabsorption

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  • Okada Kozo
    Department of Physics, Faculty of Science, Okayama University

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  • Electronic structure of Nd2-xCe[x]CuO4 and La2-xSr[x]CuO4 deduced from Cu 2p photoemission and photoabsorption
  • Electronic Structure of Nd<sub>2-<i>x</i></sub>Ce<sub><i>x</i></sub>CuO<sub>4</sub> and La<sub>2-<i>x</i></sub>Sr<sub><i>x</i></sub>CuO<sub>4</sub> Deduced from Cu 2 <i>p</i> Photoemission and Photoabsorption

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Abstract

The electronic structures of Nd2−xCexCuO4 and La2−xSrxCuO4 are studied using numerical diagonalization calculations for cluster models, Cu5O16, Cu7O20, and Cu8O16. The Fermi energy of Nd2CuO4 used in the experiment is assumed to be pinned at the bottom of the upper Hubbard band, while that of La2CuO4 is assumed to be pinned at the top of the Zhang–Rice singlet band. This assumption enables us to consistently understand the doping dependence of the Cu 2p photoemission and photoabsorption spectra in Nd2−xCexCuO4 and La2−xSrxCuO4 on the basis of the so-called “crossing the gap” picture. The present calculation of Cu 2p photoemission spectrum also shows that core hole screening caused by charge transfer between neighboring CuO4 plaquettes, in other words, nonlocal screening (NLS), is important in Nd2CuO4 as well as in La2CuO4.

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