An X-ray spectral study of the influence on the electronic structure of highT c superconductors of the parameters determining the superconducting transition temperature |
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| Authors: | S B Erenburg N V Bausk L N Mazalov V S Kravchenko O V Razlevinskaya Ye B Amitin S A Gromilov |
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| Affiliation: | (1) Institute of Inorganic Chemistry, Siberian Branch of the USSR Academy of Sciences, Prospekt Lavrentyeva 3, 630090 Novosibirsk, USSR |
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| Abstract: | CuL α and OK α X-ray fluorescence spectra, corresponding to the Cd3d-Cu2p and O2p-O1s transitions, and XANES and EXAFS spectra (CuK, YK, BiL, PbL) have been obtained for the following series of samples: (i) YBa2Cu3O7−δ (0<δ<0·8), (ii) La2−x Sr x CuO4 (0<x<0·3) and (iii) Bi2(Sr, Ca) n+1 Cu n O2n+4 (n=1,2,3), Bi1·8Pb0·3Sr1·9Ca2Cu3O y . A correlation has been found between the decrease in the superconducting transition temperature (T c ) with variation in the stoichiometric parametersδ andx in series (i) and (ii), and the shift of the maximum in their CuL α spectra and the relative increase in the number of occupied states Cu3d in the upper part of the valence band. The changes in the distribution of the Cu3d and O2 p densities and in the spectral parameters of the samples are discussed. |
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| Keywords: | X-ray spectra electronic structure superconducting transition temperature |
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