Single-phase 60-K bulk superconductor in annealed Ba2YCu307−δ(0.3<δ<0.4) with correlated oxygen vacancies in the Cu-O chains
R. J. Cava, B. Batlogg, C. H. Chen, E. A. Rietman, S. M. Zahurak, D. Werder
DOI 10.1103/PhysRevB.36.5719 · Physical Review B
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Abstract
Employing a gettered annealing technique, we have prepared homogeneous polycrystalline samples of oxygen-deficient Ba2YCu3O7−δ for 0≤δ≤0.7. Measurements of resistive Tc, resistivity, magnetization, and lattice parameter indicate that a distinct bulk superconducting phase with a Tc of 60 K occurs in the range of 0.3<δ<0.4. This phase displays partial ordering of oxygen vacancies in the Cu-O chains as found by electron diffraction studies.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba2YCu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60 | Pressure unresolved | midpoint |
| Ba2YCu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60 | Pressure unresolved | onset |
| Ba2YCu3O7-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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