Anomalous upper critical fields of superconducting multilayers: Verification of the Takahashi-Tachiki effect
M. G. Karkut, V. Matijasevic, L. Antognazza, J.-M. Triscone, N. Missert, M. R. Beasley, Ø. Fischer
DOI 10.1103/PhysRevLett.60.1751 · Physical Review Letters
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Abstract
We observe for the first time the anomalous upturn in the parallel upper critical field predicted for metallic multilayers composed of two materials which have different diffusion coefficients but which have the same superconducting transition temperature. We observe this upturn, which reflects the shift of the nucleation field from the clean to the dirty layers, in multilayers of Nb/Nb0.6Ti0.4 having composition wavelengths Λ≥420 Å. The temperature at which the upturn occurs increases with Λ, as predicted by theory.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.95 | Pressure not reported | unknown |
| Nb0.6Ti0.4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.14 | Pressure not reported | unknown |
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