Vortices with Fractional Flux in Two-Gap Superconductors and in Extended Faddeev Model

2001/11/30 by Egor Babaev · 2 citations
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #cond-mat.supr-con #hep-ph #hep-th

paper · pdf · doi:10.1103/physrevlett.89.067001

published as Phys.Rev.Lett. 89 (2002) 067001 · v2 references added, v3 journal version, presentation improved. Links to related papers are available at the home page of the author http://www.teorfys.uu.se/PEOPLE/egor

openalex publication_date 2002/07/23 · arxiv created 2002/09/03 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We discuss linear topological defects allowed in two-gap superconductors and equivalent extended Faddeev model. We show that, in these systems, there exist vortices which carry an arbitrary fraction of magnetic flux quantum. Besides that, we discuss topological defects which do not carry magnetic flux and describe features of ordinary one-magnetic-flux-quantum vortices in the two-gap system. The results could be relevant for the newly discovered two-band superconductor MgB2.

Citations

• Stable knot-like structures in classical field theory
• Bardeen-Cooper-Schrieffer Theory of Superconductivity in the Case of Overlapping Bands
• Evidence for Two Superconducting Energy Gaps inMgB2by Point-Contact Spectroscopy

Cited by

• Field Dependence of the Vortex Core Size in a Multiband Superconductor
• Fractional electric charge of a magnetic vortex at nonzero temperature