Asymmetric local displacements in the Bi2Sr2CaCu2O8+δ superconductor
Unita' INFM and Dipartimento di Fisica, Università di Roma "La Sapienza",
P.A. Moro 2, 00185 Roma, Italy
2 Electrotechnical Laboratory, Umezono, Tsukuba, Ibaraki 305 Tsukuba, Japan
Published online: 15 November 2000
Instantaneous in-plane Cu-O bond distribution in the Bi2Sr2CaCu2O8+δ (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
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000