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X-Ray Absorption Studies of La2−xSrxCuO4 and Y1−xPrxBa2Cu3O7-δ (*)

  • E. E. Alp (a1), G. K. Shenoy (a1), L. Soderholm (a1), G. L. Goodman (a1), D. G. Hinks (a1), B. W. Veal (a1), P. A. Montano (a2) and D. E. Ellis (a3)...

Abstract

The question of valence of Cu and rare-earth atoms in the newly discovered oxide superconductors with high transition temperatures is crucial to the understanding of their electronic structure. We have measured the X-Ray Absorption Near Edge Structure (XANES) of Cu K transition and Pr Ljjj transition to obtain information on the valence of Cu, and Pr in La2−xSrxCuO4 and Y1−xPrxBa2Cu3O7-δ. We will present the experimental results, compare them with calculations of absorption cross-section for model atomic clusters, and discuss the valence of Cu as a function of oxygen concentration.

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Work supported by US DOE, BES-Materials Sciences and Chemical Sciences, contract # W-31-109-ENG-38

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