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Issue		Eur. Phys. J. B Volume 18, Number 2, November 2000
Page(s)		257 - 261
DOI		10.1007/s100510070056

Eur. Phys. J. B 18, 257-261

Asymmetric local displacements in the $\mathsf{Bi_2Sr_2CaCu_2O_{8+\delta}}$ superconductor

N.L. Saini¹ - A. Lanzara¹ - A. Bianconi¹ - H. Oyanagi²

¹Unita' INFM and Dipartimento di Fisica, Università di Roma "La Sapienza", P.A. Moro 2, 00185 Roma, Italy
²Electrotechnical Laboratory, Umezono, Tsukuba, Ibaraki 305 Tsukuba, Japan

antonio.bianconi@romal.infn.it

Received 5 June 2000

Abstract
Instantaneous in-plane Cu-O bond distribution in the Bi₂Sr₂CaCu₂O $_{8+\delta}$ (Bi2212) superconductor has been investigated by high k-resolution Cu K-edge extended X-ray absorption fine structure (EXAFS) measured with polarized vector parallel to the two orthogonal Cu-O-Cu bonds of the CuO₂ square plane. The results show an anisotropic Cu-O distribution in the two directions and provide further information on the local atomic displacements in the lattice-charge stripes.

PACS
74.72.Hs Bi-based cuprates - 61.10.Ht X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc. - 74.80.-g Spatially inhomogeneous structures

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