| EXAFS and XANES Study of Structural and Electronic Changes in Y1-xPrxBa2Cu3O7 (1997) | |||||||||||||||
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| We present X-ray absorption fine structure (EXAFS) data from Y,Pr,Ba and Cu edges for various concentrations of Pr in Y1-xPrxBa2Cu3O7. Analysis of Y K-edge EXAFS shows no evidence for major changes in interatomic distance or in its mean square variation with composition. The individual Ba-O distances have weak compositional dependence. The Pr-O distance is found to vary linearly with composition. We have interpreted the changes in Pr-O distance to conclude the existence of Pr in a mixture of Pr3+ and Pr4+ States. The Cu-O coordinates at about 2.4 Å (the apical oxygen for Cu) appear to have a compositional dependence. Changes in electronic structure are also discussed besides structural changes along with their correlation. | |||||||||||||||
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