Local structural features of the superconducting Bi2Sr2CaCu2O8+δ system: A polarized Cu K-edge XAS study

N. L. Saini, A. Lanzara, A. Bianconi, and H. Oyanagi
Phys. Rev. B 58, 11768 – Published 1 November 1998
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Abstract

Local structure of CuO2 plane of the superconducting Bi2Sr2CaCu2O8+δ (Bi2212) crystal at the optimum doping has been investigated by in-plane polarized Cu K-edge x-ray-absorption spectroscopy. We have determined the quadrupole character of the 1s3dx2y2 transition in the x-ray-absorption near-edge spectra by rotation of the in-plane polarization geometry by 45° from the Cu-O-Cu direction. The nonzero intensity of this transition in the polarization vector parallel to the Cu-O-Cu direction indicates local structural distortion of the CuO4 square plane. The statistical distribution of the instantaneous Cu-O bonds is determined by polarized extended x-ray-absorption fine structure and discussed.

  • Received 22 October 1997

DOI:https://doi.org/10.1103/PhysRevB.58.11768

©1998 American Physical Society

Authors & Affiliations

N. L. Saini, A. Lanzara, and A. Bianconi

  • Dipartimento di Fisica and Unitá INFM, Università di Roma “La Sapienza,” P. A. Moro 2, 00185 Roma, Italy

H. Oyanagi

  • Electrotechnical Laboratory, Umezono, Tsukuba, Ibaraki 305, Tsukuba, Japan

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Vol. 58, Iss. 17 — 1 November 1998

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