Temperature Dependent Local Instability of the Hg1212 Structure by Polarized EXAFS

N.L. Saini; M. Brunelli; A. Lanzara; M. Lusignoli; T. Rossetti; A. Bianconi; P. Bordet; F. Duc; J.L. Hazemann; J. Karpinski

doi:doi:10.1051/jp4:19972215

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

J. Phys. IV France 7 (1997) C2-1245-C2-1246
DOI: 10.1051/jp4:19972215

Temperature Dependent Local Instability of the Hg1212 Structure by Polarized EXAFS

N.L. Saini¹, M. Brunelli¹, A. Lanzara¹, M. Lusignoli¹, T. Rossetti¹, A. Bianconi¹, P. Bordet², F. Duc², J.L. Hazemann² and J. Karpinski³

¹ Dipartimento di Fisica, Università di Roma "La Sapienza", P.A. Moro 2, 00185 Roma, Italy
² Laboratoire de Cristallographie CNRS, avenue des Martyrs, 38042 Grenoble, France
³ Solid State Physics Laboratory, Swiss Federal Institute of Technology, ETH Hönggeberg 8093, Switzerland

Abstract
The local structure of the (Hg1212) crystal has been investigated by temperature dependent polarized Cu K-edge extended x-ray absorption fine structure (EXAFS). We have observed an anomalous behavior of the local structure showing anomaly at around the superconducting transition temperature T_c in the temperature dependence of the Cu-O(planar) distance. The result suggests similarity of the temperature dependent local instability in the superconducting cuprates.