Superconducting phase transition of Sr2RuO4 in magnetic field
Abstract
The superconducting state formed due to direct intra-orbital pairing in tetragonal multi-band superconductor Sr2RuO4 has different properties than the state formed due to intra-band pairing. In particular, the theory operating with direct intra-orbital pairing successfully explains the Kerr rotation of reflected light polarization observed several years ago. Here we apply intra-orbital approach to the problem of Ginzburg-Landau description of basal plane upper critical field in this material. It is shown that typical for two component superconducting state additional phase transition in the vortex state at H<Hc2 for all four crystallographic directions of magnetic field in the basal plane and the basal plane upper critical field anisotropy still are inevitable properties even in case of direct intra-orbital pairing.
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