Local structural features of the superconducting Bi2Sr2CaCu2O8+δ system: A polarized Cu K-edge XAS study
N. L. Saini, A. Lanzara, A. Bianconi, H. Oyanagi
DOI 10.1103/PhysRevB.58.11768 · Physical Review B
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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 1s→3dx2−y2 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure not reported | unknown |
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