Superconductivity and Mössbauer effect of FexCu1−xBa2YCu2O7+y superconductors synthesized by high pressure
Y. H. Liu, G. C. Che, K. Q. Li, Z. X. Zhao, Z. Q. Kou, N. L. Di, Z. H. Cheng
DOI 10.1103/PhysRevB.71.104503 · Physical Review B
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Abstract
The superconductivity in FexCu1−xBa2YCu2O7+y superconductors (0.00⩽x⩽0.70) is improved by high-pressure (HP) synthesis. The HP samples have higher oxygen content than the ambient pressure (AM) samples. Mössbauer effect studies confirmed that the high-pressure synthesis changes the local structure on the atomic scale. For the HP samples Fe (2) in the CuO2 planes has highly symmetric pyramidal-oxygen coordination. The tetragonal coordinated Fe (1) in the CuOx chains disappears and becomes the one having fivefold and sixfold oxygen coordination after the high-pressure synthesis. This suggests that the increase of oxygen content and the change of local structure are important reasons for the improvement of superconductivity in the HP samples.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Fe0.5Cu0.5Ba2YCu2O7+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | unknown |
| Fe0.5Cu0.5Ba2YCu2O7+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | unknown |
| Fe0.06Cu0.94Ba2YCu2O7.25 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | unknown |
| YSr2Cu2.7Fe0.3O7+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60 | Pressure not reported | unknown |
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