Local structure distortion in a YBa2-Sr0.520.52Cu3O7 superconductor
K. Zhang, G. Bunker, B. Chance, C. F. Gallo
DOI 10.1103/PhysRevB.39.2788 · Physical Review B
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Abstract
X-ray-absorption fine structure has been used to study local structure distortions of a Sr-doped superconductor YBa2−xSrxCu3O7−δ with x=0.52 and Tc=95 K. Direct comparison with the undoped superconductor shows that the local structure around the Sr atoms, which are directly observed to substitute for Ba atoms, was found to be distorted significantly, with four oxygen atoms located at the Ba/Sr plane shifted towards Sr atoms by 0.14 Å, and Sr shifted closer to the Cu(2) plane by 0.05 Å. No significant changes are found for the local structures around Cu and Y atoms, which implies that the Cu(2) plane and CuO2-Y-CuO2 sandwich structure is preserved.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2-xSrxCu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 95 | Pressure not reported | unknown |
| YBa2-xSrxCu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | unknown |
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