Phys. Rev. Lett. 89, 067001 (2002) [4 pages]Vortices with Fractional Flux in Two-Gap Superconductors and in Extended Faddeev ModelReceived 17 November 2001; published 23 July 2002 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. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.067001
DOI:
10.1103/PhysRevLett.89.067001
PACS:
74.60.–w, 11.27.+d, 74.76.Db
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