YBa2CU3O7/PrBa2Cu3O7 superlattices: Properties of Ultrathin superconducting layers separated by insulating layers
J.-M. Triscone, O?. Fischer, O. Brunner, L. Antognazza, A. D. Kent, M. G. Karkut
DOI 10.1103/PhysRevLett.64.804 · Physical Review Letters
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Abstract
We have artificially varied the coupling between ultrathin YBa2Cu3O7 layers by interposing insulating planes of PrBa2Cu3O7 in multilayers and studied the consequences of decoupling 12-Å YBa2Cu3O7 unit cells on the superconducting properties. We find that the Tc (midpoint) of a 12-Å/12-Å multilayer is 55 K, twice that of the corresponding alloy. Tc decreases linearly with further separation of the YBa2Cu3O7 unit cells, the transition width increases and shows evidence of 2D fluctuations, and the influence of a magnetic field parallel to the layers is markedly reduced.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 55 | Pressure not reported | midpoint |
| (Y0.5Pr0.5)Ba2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | zero_resistance |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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