Topological Superconductivity Near Ferromagnetism―Theoretical Prediction for UTe₂ and UCoGe

Abstract

Spin-triplet superconductivity due to Cooper pairs with spin 1 degree of freedom has been increasingly attracted interest as a candidate for topological superconducting materials. A spin-triplet superconducting state is expected to emerge in the vicinity of the ferromagnetic phase, as found in Uranium-based heavy-fermion systems. Using first-principles calculations and extending Fermi surface formulas, we theoretically predict topological superconductivity in UCoGe and a newly discovered superconductor UTe₂ .