Electronic states in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mi mathvariant="normal">−</mml:mi><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><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:mo>+</mml:mo><mml:mi mathvariant="normal">δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>probed by soft-x-ray absorption
C. T. Chen(AT&T (United States)), F. Sette(Sandia National Laboratories), Yong Ma(University at Buffalo, State University of New York), Mark S. Hybertsen(University at Buffalo, State University of New York), Ellen B. Stechel(University at Buffalo, State University of New York), W. M. C. Foulkes(University at Buffalo, State University of New York), M. Schulter(University at Buffalo, State University of New York), S-W. Cheong(Sandia National Laboratories), A. S. Cooper(University at Buffalo, State University of New York), L. W. Rupp(University at Buffalo, State University of New York), B. Batlogg(AT&T (United States)), Y. L. Soo(Sandia National Laboratories), Z. H. Ming(AT&T (United States)), Andrzej Król(University at Buffalo, State University of New York), Y. H. Kao(AT&T (United States))
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Abstract
Oxygen K-edge absorption spectra of carefully characterized ${\mathrm{La}}_{2\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Sr}}_{\mathit{x}}$${\mathrm{CuO}}_{4+\mathrm{\ensuremath{\delta}}}$ samples were measured using a bulk-sensitive fluoresence-yield-detection method. They reveal two distinct pre-edge peaks which evolve systematically as a function of Sr concentration. The measured spectra are quantitatively described by calculations based on the Hubbard model, including local Coulomb interactions and core-hole excitonic correlations. The absorption data are consistent with a description of electronic states based on a doped charge-transfer insulator.
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