EXAFS and XANES Study of Structural and Electronic Changes in Y1-xPrxBa2Cu3O7

M. Khaled; N.L. Saini; S.J. Gurman; J.C. Amiss; K.B. Garg

doi:doi:10.1051/jp4:19972153

Issue		J. Phys. IV France Volume 7, Number C2, Avril 1997 Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure


Page(s)		C2-1121 - C2-1122
DOI		https://doi.org/10.1051/jp4:19972153

Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure

J. Phys. IV France 7 (1997) C2-1121-C2-1122
DOI: 10.1051/jp4:19972153

EXAFS and XANES Study of Structural and Electronic Changes in Y_1-xPr_xBa₂Cu₃O₇

M. Khaled¹, N.L. Saini¹, S.J. Gurman², J.C. Amiss³ and K.B. Garg¹

¹ Department of Physics, University of Rajasthan, Jaipur 30 2004, India
² Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK
³ Biomedical Sciences, Sheffield Hallam University, Sheffield S1 1WB, UK

Abstract
We present X-ray absorption fine structure (EXAFS) data from Y,Pr,Ba and Cu edges for various concentrations of Pr in Y_1-xPr_xBa₂Cu₃O₇. 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.