Mercredi 06 juin 2012 à 11h15
Salle 234, Ecole de Physique

Possible pairing symmetries in SrPtAs

Jun Goryo, ETH Zürich

We discuss possible pairing symmetries in the hexagonal pnictide superconductor SrPtAs. The local lack of inversion symmetry in the two distinct layers of the unit cell results in a special spin-orbit coupling with a staggered structure. We analyze the stable pairing symmetry within a tight-binding model with an in-plane, density-density type pairing interaction. For sufficiently strong nearest-neighbor interactions, we find that a mixture of states with spin-singlet chiral d-wave and spin-triplet chiral p-wave pairing symmetries overcomes the conventional s-wave pairing state.