Effects of Interlayer Coupling on the Irreversibility Lines of NbN/AlN Superconducting Multilayers
E. S. Sadki, Z. H. Barber, S. J. Lloyd, M. G. Blamire, A. M. Campbell
DOI 10.1103/PhysRevLett.85.4168 · Physical Review Letters
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Abstract
We have studied the temperature dependence of the in-plane resistivity of NbN/AlN multilayer samples with varying insulating layer thickness in magnetic fields up to 7 T parallel and perpendicular to the films. The upper critical field shows a crossover from 2D to 3D behavior in parallel fields. The irreversibility lines have the form (1−T/Tc)α, where α varies from 43 to 2 with increasing anisotropy. The results are consistent with simultaneous melting and decoupling transitions for the low anisotropy sample, and with melting of decoupled pancakes in the superconducting layers for higher anisotropy samples.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NbN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13.3 | Pressure not reported | midpoint |
| NbN/AlN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.7 | Pressure not reported | midpoint |
| NbN/AlN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.9 | Pressure not reported | midpoint |
| NbN/AlN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.7 | Pressure not reported | midpoint |
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