Superconducting properties of a 27-Å phase of Ba-Y-Cu-O
M. L. Mandich, A. M. DeSantolo, R. M. Fleming, P. Marsh, S. Nakahara, S. Sunshine, J. Kwo, M. Hong, T. Boone, T. Y. Kometani, L. Martinez-Miranda
DOI 10.1103/PhysRevB.38.5031 · Physical Review B
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Abstract
High-purity (97%) samples of 27-Å phase of Y-Ba-Cu-O have been prepared in superconducting thin films on (100) SrTiO3. The possibility that the observed superconductivity might arise from a residual 3% Ba2YCu3O7 impurity in this sample is ruled out using transmission electron microscopy which shows that it is present only as isolated particles. This allows for an unambiguous determination that the 27-Å phase is superconducting with an onset Tc of 82 K and Tc(R=0) of 79 K.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y2Ba4Cu8O20-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 82 | Pressure not reported | onset |
| Y2Ba4Cu8O20-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 79 | Pressure not reported | zero_resistance |
| Ba2YCu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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