Superconductivity in an anomalously tetragonal YBa2Cu3O6.62 single crystal: A possible singularity in the structural phase diagram
T. Frello, N. H. Andersen, M. Baziljevich, T. H. Johansen, J.-C. Grivel, H. F. Poulsen, M. v. Zimmermann, J. R. Schneider, R. Liang, P. Dosanjh, W. N. Hardy, Th. Wolf
DOI 10.1103/PhysRevB.67.024509 · Physical Review B
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Abstract
During systematic studies of the structural phase diagram of YBa2Cu3O6+x (YBCO), a YBCO single crystal of oxygen concentration x=0.62 turned out to have a tetragonal crystal structure. By magneto-optical imaging of the expulsion of an applied magnetic field, it was shown that the sample was bulk superconducting. This makes the sample highly anomalous in two respects: with a stoichiometry of YBa2Cu3O6.62 the sample should have an orthorhombic symmetry, and a tetragonal undoped sample should not be superconducting at all. Our results corroborate previous findings of Topnikov et al. [JETP Lett. 46, 577 (1987)] of a tetragonal superconducting YBCO crystal with x=0.62.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6.62 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 43 | Pressure not reported | onset |
| YBa2Cu3O6.62 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 27 | Pressure not reported | onset |
| YBa2Cu3O6.62 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 57 | Pressure not reported | onset |
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