Fe0.5Cu0.5(Ba1−xSrx)2YCu2O7+δ (x=0, 0.5, and 1) superconductors prepared by high-pressure synthesis
Z. A. Ren, G. C. Che, Y. M. Ni, C. Dong, H. Chen, S. L. Jia, Z. X. Zhao
DOI 10.1103/PhysRevB.69.014507 · Physical Review B
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Abstract
In this paper, the Fe-containing superconductors Fe0.5Cu0.5Ba2YCu2O7+δ, Fe0.5Cu0.5BaSrYCu2O7+δ, and Fe0.5Cu0.5Sr2YCu2O7+δ were successfully prepared by common solid-state reaction followed with a procedure of high pressure synthesis. The structural change and superconducting properties in (FexCu1−x)BaSrYCu2O7+δ (x=0−1.0) systems were also investigated. Annealing experiments indicate that the occurrence of superconductivity in Fe0.5Cu0.5(Ba1−xSrx)2YCu2O7+δ (x=0, 0.5, and 1) systems is mainly induced by the procedure of high-pressure synthesis, which causes the increase of oxygen content and the redistribution of Fe atoms between Cu(1) and Cu(2) sites, but not from possible secondary phase of YBa2Cu3O7−δ, YBaSrCu3O7−δ or YSr2Cu3O7−δ superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Fe0.5Cu0.5BaSrYCu2O7+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 77 | Pressure not reported | onset |
| Fe0.5Cu0.5Ba2YCu2O7+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 83 | Pressure not reported | onset |
| Fe0.5Cu0.5Ba2YCu2O7+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 63 | Pressure not reported | zero_resistance |
| Fe0.5Cu0.5Sr2YCu2O7+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 77 | Pressure not reported | onset |
| YSr2Cu2.7Fe0.3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60 | Pressure not reported | unknown |
| FeSr2YCu2O7 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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