Influence of a magnetic field on the two-dimensional phase transition in thin-film superconductors
J. C. Garland, Hu Jong Lee
DOI 10.1103/PhysRevB.36.3638 · Physical Review B
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Abstract
This paper reports an experimental study of the influence of a magnetic field on the phase transition and low-temperature dynamical properties of two-dimensional superconducting films. Five samples of granular indium/indium oxide composite films were studied, with sheet resistances varying from 945 to 3150 Ω/□, and thicknesses from 100 to 250 Å. Measurements were made of the resistance R(T,H) and of the current-voltage characteristics in perpendicular magnetic fields of maximum value 30 G. The temperature range investigated ranged from 0.7Tc0 to 1.5Tc0, where Tc0 is the Bardeen-Cooper-Schrieffer mean-field transition temperature. In the temperature regime above Tc, the Kosterlitz-Thouless vortex unbinding temperature, the resistance was found to obey universal magnetic field scaling. Below Tc, the magnetoresistance displayed an activated temperature dependence characteristic of vortex pinning. The pinning activation energy U(H,T) increased with a Ginzburg-Landau temperature dependence below Tc and displayed an unusual magnetic field dependence, varying inversely with magnetic field below 1 G, but becoming independent of field in stronger fields. As Tc was approached from below, all signs of vortex pinning disappeared, with U(H,Tc)=0 and the magnetoresistance exhibiting linear Bardeen-Stephen behavior. These results are interpreted in the context of other work on two-dimensional superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| In/InOx 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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