Signatures of pairing mechanisms and order parameters in ferromagnetic superconductors

TL;DR

This paper predicts how pairing mechanisms influence properties of ferromagnetic superconductors, specifically magnon mass and specific heat anomalies, aiding in understanding their underlying physics.

Contribution

It introduces two novel predictions linking pairing mechanisms to observable properties in ferromagnetic superconductors, helping to distinguish between different theoretical models.

Findings

Magnon mass inversely proportional to the square of magnetization.

Broad specific heat anomaly in URhGe splits into a transition with better sample quality.

Predictions assist in identifying the pairing mechanism in ferromagnetic superconductors.

Abstract

Two predictions are made for properties of the ferromagnetic superconductors discovered recently. The first one is that spin-triplet, p-wave pairing in such materials will give the magnons a mass inversely proportional to the square of the magnetization. The second one is based on a specific mechanism for p-wave pairing, and predicts that the observed broad anomaly in the specific heat of URhGe will be resolved into a split transition with increasing sample quality. These predictions will help discriminate between different possible mechanisms for ferromagnetic superconductivity.