Oxygen-vacancy ordering and microstructure in annealed YBa2Cu3O7−δ superconductors
D. J. Werder, C. H. Chen, R. J. Cava, B. Batlogg
DOI 10.1103/PhysRevB.38.5130 · Physical Review B
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Abstract
We present the results of a systematic electron diffraction study of short-range oxygen-vacancy ordering in ceramic YBa2Cu3O7−δ superconductors with 0.08≤δ≤0.67, prepared by a Zr-getter technique. In addition to the two types of orderings with reduced wave vectors ((1/2,0,0) and ((2/5,0,0), a new vacancy ordering with reduced wave vector((1/3,0,0) has been found. We have observed in samples with δ=0.5 a vacancy ordering with a large correlation length (∼150 Å) in the c-axis direction. We have also observed a tweedlike microstructure at δ=0.61, which is caused by a high density of microtwins.
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 |
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