Diffraction evidence for oxygen-vacancy ordering in annealed Ba2YCu3O7−δ (0.3≲δ≲0.4) superconductors
D. J. Werder, C. H. Chen, R. J. Cava, B. Batlogg
DOI 10.1103/PhysRevB.37.2317 · Physical Review B
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Abstract
Diffuse streaks centered at q=(0,±(2/5,0) and (0,±(1/2,0) have been observed in annealed Ba2YCu3O7−δ with 0.3≲δ≲0.4, which has a Tc of 60 K and a Meissner effect equivalent to the 90 K phase. We interpret the presence of the diffuse streaking as a result of short-range oxygen vacancy ordering. The vacancy ordering has a short correlation length along the copper-oxygen chains (b direction) and a long correlation length perpendicular to the chains along the a direction. The ordered structure is completely uncorrelated parallel to the c axis.
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 not reported | unknown |
| Ba2YCu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60 | Pressure not reported | midpoint |
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