Paramagnetic limit of spin-triplet superconductors

Abstract

We study the phase diagram of spin-triplet superconductors, considering the effect of the external magnetic field on the electrons' spins. For a given symmetry of the order parameter and a generic orientation of the field, we find that the paramagnetic limit for superconductivity diverges at low temperatures. Furthermore, we identify a range of temperatures where the transition between normal and superconducting phases becomes of the first order. When two tricritical points exist along the transition line, a first order phase transition between two superconducting phases may develop in vicinity of the tricritical point with lower temperature. We discuss the implications of our findings for the anisotropy of the upper critical field in UPt${}_3$, a candidate material for triplet superconductivity, when both the paramagnetic and orbital effects are taken into account.

arXiv comment5 pages, 3 figures

References in corpus (5)

• Isotropic Pauli-Limited Superconductivity in the Infinite Layer Nickelate Nd${}_{0.775}$Sr${}_{0.225}$NiO${}_2$
• Exotic multi-gap structure in UPt${}_3$ unveiled by the first-priniciples analysis
• Paramagnetic limiting in ferromagnetic superconductors with triplet pairing
• Anomalous Field-Angle Dependence of the Specific Heat of Heavy-Fermion Superconductor UPt3
• Two tricritical lines from a Ginzburg-Landau expansion: application to the LOFF phase