Ginzburg-Landau Theory for a p-Wave Sr2RuO4 Superconductor: Vortex Core Structure and Extended London Theory
R. Heeb, D. F. Agterberg
Abstract
Based on a two dimensional odd-parity superconducting order parameter for Sr2RuO4 with p-wave symmetry, we investigate the single vortex and vortex lattice structure of the mixed phase near Hc1. Ginzburg-Landau calculations for a single vortex show a fourfold structure with an orientation depending on the microscopic Fermi surface properties. The corresponding extended London theory is developed to determine the vortex lattice structure and we find near Hc1 a centered rectangular vortex lattice. As the field is increased from Hc1 this lattice continuously deforms until a square vortex lattice is achieved. In the centered rectangular phase the field distribution, as measurable through μ-SR experiments, exhibits a characteristic two peak structure (similar to that predicted in high temperature and borocarbide superconductors).
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