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Fluctuation-induced first order phase transitions in type-1.5 superconductors in zero external field | | Hannes Meier
; Egor Babaev
; Mats Wallin
; | | Date: |
24 Nov 2014 | | Abstract: | In a single-component Ginzburg-Landau model that possesses thermodynamically
stable vortex excitations, the zero-field superconducting phase transition is
second order even when fluctuations are included. Beyond the mean-field
approximation the transition is described in terms of proliferation of vortex
loops. Here we determine the order of the superconducting transition in an
effective 3D vortex-loop model for the recently proposed multi-band type-1.5
superconductors where the vortex interaction is non-monotonic, i.e.,
intermediate-range attractive and short-range repulsive. We find that the
details of the vortex interaction, despite its short-range nature, can play an
important role for the properties of the transition. In the type-1.5 regime
with non-monotonic intervortex interaction, in contrast to the single-band case
we find a first-order vortex-driven phase transition. | | Source: | arXiv, 1411.6376 | | Services: | Forum | Review | PDF | Favorites | |
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