Exchange interaction for the formation of Cooper pairs in UTe₂ superconductor

UTe₂ is considered a spin-triplet superconductor that combines superconductivity with seemingly incompatible ferromagnetism. A theoretical explanation of the pairing mechanism must have a two-particle exchange interaction that favors the formation of Cooper pairs under the triplet configuration. By modifying the Bardeen-Cooper-Schrieffer (BCS) theory using parameters extracted from ab-initio density functional calculations, we are able to calculate the critical temperature and an average superconducting gap for UTe₂. The research is further extended into the superconductivity under pressure. The change of critical temperature and the superconducting gap of UTe₂ under compression will be shown to be consistent with the results of experiment.