Surface superconductivity in the heavy-fermion superconductor UPt3
N. Keller, J. L. Tholence, A. Huxley, J. Flouquet
DOI 10.1103/PhysRevB.54.13188 · Physical Review B
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Abstract
We present a study of the surface critical field Hc3(Φ,Θ,T) measured for two needlelike whiskers of UPt3. Dominant surface effects were observed in the angular dependence of the critical field by means of ac-resistivity measurements. These surface superconductivity effects show a surprisingly nonlinear thermal variation of Hc3 contrary to behavior expected from conventional theory, where Hc3/Hc2 = 1.69 is predicted. The ratio Hc3/Hc2 is strongly depressed from its initial value 1.7 when going from the A to the C phase as the temperature is decreased. It seems to remain constant in the C phase for even lower T. Nevertheless, for temperatures close to Tc+ it is possible to describe the angular behavior of Hc3(Θ,Φ) with a standard model by introducing an effective-mass anisotropy of the heavy quasiparticles. These results are compared to recent Hc3 calculations for different representations of the order parameter and seem to provide a direct evidence for the suppression of one component of the order parameter at the surface. The restrictions imposed by these measurements on the choice of the representations of the unconventional order parameter will be discussed by also taking into account the limitations imposed due to the temperature dependence of the basal plane Hc2 modulation. © 1996 The American Physical Society.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.508 | Pressure not reported | midpoint |
| UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.501 | Pressure not reported | midpoint |
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