Fluctuation-induced first order phase transitions in type-1.5 superconductors in zero external field
2015 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 91, no 9, 094508Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2015. Vol. 91, no 9, 094508
IdentifiersURN: urn:nbn:se:kth:diva-160964DOI: 10.1103/PhysRevB.91.094508ISI: 000351426000002ScopusID: 2-s2.0-84925859091OAI: oai:DiVA.org:kth-160964DiVA: diva2:793049
FunderKnut and Alice Wallenberg FoundationSwedish Research Council, 642-2013-7837, 325-2009-7664, 621-2012-3984
QC 201503202015-03-062015-03-062015-04-17Bibliographically approved