Fractional vortex lattice structures in spin triplet superconductors

Details Fractional vortex lattice structures in spin triplet superconductors Fractional vortex lattice structures in spin triplet superconductors

2009-05-07

arxiv.org/abs/0905.1132v2

New J Phys 11 085004 (2009)

Physics

Condensed Matter

Superconductivity

13 pages, 6 figures. The version published in New Journal of Physics focus issue on 'Superconductors with Exotic Symmetry' wit

Scientific paper

10.1088/1367-2630/11/8/085004

Motivated by recent interest in spin triplet superconductors, we investigate the vortex lattice structures for this class of unconventional superconductors. We discuss how the order parameter symmetry can give rise to U(1)$\times$U(1) symmetry in same sense as in spinor condensates, making half-quantum vortices (HQV) topologically stable. We then calculate the vortex lattice structure of HQV's, with particular attention on the roles of the crystalline lattice, the Zeeman coupling, and Meissner screening, all absent in spinor condensates. Finally, we consider how spin-orbit coupling leads to a breakdown of the U(1)$\times$U(1) symmetry in free energy and whether the HQV lattice survives this symmetry breaking. As examples, we examine simpler spin-triplet models proposed in the context of NaxCoO2$\cdot$yH2O and Bechgaard salts, as well as the better known and more complex model for Sr2RuO4.

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