Superconductivity in nonsymmetric epitaxial YBa2Cu3O7−x/PrBa2Cu3O7−x superlattices: The superconducting behavior of Cu-O bilayers
Douglas H. Lowndes, David P. Norton, J. D. Budai
DOI 10.1103/PhysRevLett.65.1160 · Physical Review Letters
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Abstract
We have fabricated epitaxial, nonsymmetric M×N superlattices in which YBa2Cu3O7−x (YBCO) layers either M=1, 2, 3, 4, or 8 c-axis unit cells thick are separated by insulating PrBa2Cu3O7−x (PrBCO) layers N unit cells thick (N=1 to ∼16). The zero-resistance transition temperature, Tc0, initially decreases rapidly with increasing PrBCO thickness but saturates at Tc0∼19 K or Tc0∼54 K for 1- and 2-cell-thick YBCO layers, respectively. We conclude that although intercell coupling may enhance Tc0, it is necessary for superconductivity of single-cell-thick YBCO layers in PrBCO matrix.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 19 | Pressure not reported | zero_resistance |
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 54 | Pressure not reported | zero_resistance |
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