Vortex interactions and thermally induced crossover from type-I to type-II superconductivity
J. Hove, S. Mo, A. Sudbø
DOI 10.1103/PhysRevB.66.064524 · Physical Review B
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Abstract
We have computed the effective interaction between vortices in the Ginzburg-Landau model from large-scale Monte Carlo simulations, taking thermal fluctuations of matter fields and gauge fields fully into account close to the critical temperature. We find a change, in the form of what appears to be a crossover, from an attractive to a repulsive effective vortex interactions in an intermediate range of Ginzburg-Landau parameters κ∈[0.76,1]/2 upon increasing the temperature in the superconducting state. This corresponds to a thermally induced crossover from type-I to type-II superconductivity around a temperature TCr(κ), which we map out in the vicinity of the metal-to-superconductor transition. In order to see this crossover, it is essential to include amplitude fluctuations of the matter field, in addition to phase-fluctuations and gauge-field fluctuations. We present a simple physical picture of the crossover, and relate it to observations in Ta and Nb elemental superconductors which have low-temperature values of κ in the relevant range.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ta Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Nb 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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