<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi></mml:math>-wave superconductivity near a transverse saturation field

Abstract

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 ${T}_{\mathrm{sc}}$ is calculated and shows two domes as a function of ${h}_{x}$. We find strong enhancement of ${T}_{\mathrm{sc}}$ 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 ${h}_{x}&lt;{h}_{s}$ and ${h}_{x}&gt;{h}_{s}$. We also discuss the appearance of superconductivity with zero-spin pair due to cancellation between external and exchange fields.