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

J. Phys. IV France 7 (1997) C2-735-C2-740
DOI: 10.1051/jp4:1997222

Stripe structure and Non-Homogeneity of the CuO₂ Plane by Joint EXAFS and Diffraction

A. Bianconi¹, N.L. Saini¹, A. Lanzara¹, M. Lusignoli¹, T. Rossetti¹, P.G. Radaelli², P. Bordet³, Å. Kvick⁴ and H. Oyanagi<sup>5

1</sup>  Dipartimento di Fisica, Università di Roma "La Sapienza", P.A. Moro 2, 00185 Roma, Italy
²  Institut Laue Langevin, Av. des Martyrs, 38043 Grenoble, France
³  Laboratoire de Crystallographie CNRS, Av. des Martyrs, 38043 Grenoble, France
⁴  European Synchroton Radiation Facility, (ESRF), BP. 220, 38043 Grenoble, France
⁵  Electrotechnical Laboratory, Umezono, Tsukuba, Ibaraki 305, Tsukuba, Japan

Abstract
Local structure of the CuO₂ plane in Bi₂Sr₂CaCu₂O_8+δ (Bi2212) superconductor has been solved by joint Cu K-edge extended X-ray absorption fine structure (EXAFS) and anomalous X-ray diffraction. The Cu-O pair distribution function (PDF) has been measured by EXAFS and diffraction. The displacement of the Cu ions along the c-axis shows largest amplitude and anharmonic character. The results show flat stripes of the CuO₂ lattice of width L = 15 ± 0.5 Å that are separated by stripes of bent CuO₂ plane. The modulation of the CuO₂ plane measured by EXAFS and anomalous diffraction has been discussed.

© EDP Sciences 1997