Exchange interaction for the triplet superconductor UTe2
- Resource Type
- article
- Authors
- Chih-Kai Yang; Chi-Hsuan Lee
- Source
- Scientific Reports, Vol 13, Iss 1, Pp 1-7 (2023)
- Subject
- Medicine
Science
- Language
- English
- ISSN
- 2045-2322
Abstract UTe2 is one triplet superconductor that defies conventional relation between ferromagnetism and superconductivity. Our search for a theoretical explanation starts with one spin-triplet state of two electrons and construct a two-particle exchange interaction that favors the formation of Cooper pairs under the configuration. A modified application of the Bardeen–Cooper–Schrieffer (BCS) theory using parameters derived from ab-initio density functional calculations for electrons and phonons enables us to derive the critical temperature of 1.64 K and an average superconducting gap of 0.25 meV at 0 K. We extend the investigation further into the superconductivity under pressure, showing how T c and the gap of UTe2 change under compression in ways that are consistent with the results of experiment.