Spin-Triplet Superconductivity in UTe2 and Ferromagnetic Superconductors
Abstract
The spin-triplet state is most likely realized in uranium ferromagnetic superconductors, UGe2, URhGe, UCoGe. The microscopic coexistence of ferromagnetism and superconductivity means that the Cooper pair should be realized under the strong internal field due the ferromagnetism, leading to the spin-triplet state with equal spin pairing. The field-reinforced superconductivity, which is observed in all three materials when the ferromagnetic fluctuations are enhanced, is one of the strong evidences for the spin-triplet superconductivity. We present here the results of a newly discovered spin-triplet superconductor, UTe2, and compare those with the results of ferromagnetic superconductors. Although no magnetic order is found in UTe2, there are similarities between UTe2 and ferromagnetic superconductors. For example, the huge upper critical field exceeding the Pauli limit and the field-reentrant superconductivity for H || b-axis are observed in UTe2, URhGe and UCoGe. We also show the specific heat results on UTe2 in different quality samples, focusing on the residual density of states in the superconducting phase.
Cite
@article{arxiv.2003.04055,
title = {Spin-Triplet Superconductivity in UTe2 and Ferromagnetic Superconductors},
author = {Dai Aoki and Ai Nakamura and Fuminori Honda and DeXin Li and Yoshiya Homma and Yusei Shimizu and Yoshiki J. Sato and Georg Knebel and Jean-Pascal Brison and Alexandre Pourret and Daniel Braithwaite and Gerard Lapertot and Qun Niu and Michal Valiska and Hisatomo Harima and Jacques Flouquet},
journal= {arXiv preprint arXiv:2003.04055},
year = {2020}
}
Comments
6 pages, 3 figures, accepted for publication in JPSJ Conference Proceedings