Superconductivity suppression and flux-pinning crossover in artificial multilayers of ternary RBa2Cu3O7−δ (R=Gd, Nd, and Eu)
C. Cai, B. Holzapfel, J. Hänisch, L. Schultz
DOI 10.1103/PhysRevB.70.064504 · Physical Review B
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Abstract
Superlattices and trilayers consisting of three isostructured 123-type oxide superconductors, Gd123∕Nd123∕Eu123, were prepared on (100) SrTiO3 using off-axis pulsed laser deposition. Superconducting transition temperatures (Tc) in the superlattices reduce monotonically with decreasing constituent thickness (d), while Tc and transport critical current density (Jc) of the trilayers show no such suppression, being as good as in pure 123 thin films. Individual flux pinning and collective thermal-activated flux motion characterized by logJc vs logH reveal flux pinning crossovers with field, temperature and layer thickness. Epitaxial-strain-induced thickness effects and correlated defects are applicable to account for the suppressed Tc and flux pinning crossover in the present superlattices.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| GdBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure unresolved | onset |
| NdBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure unresolved | onset |
| EuBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure unresolved | onset |
| (Gd1/3Eu1/3Nd1/3)Ba2Cu3O7-δ 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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