Numéro
J. Phys. IV France
Volume 7, Numéro C2, Avril 1997
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure
Page(s) C2-1177 - C2-1178
DOI https://doi.org/10.1051/jp4:19972181
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure

J. Phys. IV France 7 (1997) C2-1177-C2-1178

DOI: 10.1051/jp4:19972181

Altered Sr Atomic Environment in La2-xSrxCuO4

D. Haskel and E.A. Stern

Department of Physics, Box 351560, University of Washington, Seattle, WA 98195, U.S.A.


Abstract
The Sr local atomic environment in the high Tc superconductor La2-xSrxCuO4 was probed by polarized XAFS measurements at the Sr K-edge on oriented powder samples with x = 0.075,0.l at T=20K. We confirmed that Sr indeed substitutes at the La site in this compound, but alters the first neighbor oxygen environment. This was found by determining the location of the neighboring metal atoms up to the fifth shell distances through fitting the Sr XAFS, and comparing with La K-edge polarized XAFS in the same samples and with diffraction results. The significant distortions in the immediate oxygen environment of the Sr atoms can be an important factor contributing to the mechanism of the structural and high Tc phase transitions in these cuprates.



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