p-wave superconductivity near a transverse saturation field

We investigate reentrant superconductivity in an Ising ferromagnetic superconductor URhGe under a transverse magnetic field h(x). The superconducting transition temperature for p-wave order parameters T-sc is calculated and shows two domes as a function of h(x). We find strong enhancement of T-sc in the high-field dome near a saturation field h(s) where the spins align in the transverse direction. Soft magnons generate strong attractive interactions there. Spin components of the pairing show a significant change between h(x) < h(s) and h(x) > h(s). We also discuss the appearance of superconductivity with zero-spin pair due to cancellation between external and exchange fields. DOI: 10.1103/PhysRevB.87.064501