Resistive transitions of thin film superconductors in a magnetic field

M. H. Theunissen; P. H. Kes

doi:10.1103/PhysRevB.55.15183

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Resistive transitions of thin film superconductors in a magnetic field

M. H. Theunissen, P. H. Kes

DOI 10.1103/PhysRevB.55.15183 · Physical Review B

T1

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Abstract

The effect of fluctuations on the resistive transition of superconducting thin films of various thicknesses in a perpendicular magnetic field is analyzed in terms of the continuous expressions derived by Ullah and Dorsey. We studied the dimensionality and the functional dependence of the scaling procedure suggested by theory. We find good agreement in the paraconducting regime (B>Bc2) but clear deviations in the flux-flow regime (B<Bc2) illustrating the shortcomings of the Hartree approximation. We also discuss the effects of flux pinning on the melting transition for the thinnest film and compare our results with recent work on an a-NbOx film of comparable thickness. We see no evidence for the suggestion put forward by Nikulov, Remisov, and Oboznov that a vortex solid does not exist down to very low fields.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb3Ge Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.91	Pressure unresolved	unknown
MoGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.65	Pressure unresolved	unknown
Nb3Ge Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.68	Pressure unresolved	unknown