Unconventional s-Wave Pairing with Point-Node-Like Gap Structure in UTe2
Abstract
We explore the pairing state and gap structure of UTe2 using a six-orbital model which we call the f-d-p model. Our model accurately reproduces the quasi-two-dimensional Fermi surfaces consistent with recent de Haas-van Alphen oscillation measurements and the (0, π, 0) antiferromagnetic spin fluctuations observed by neutron scattering. We incorporate on-site Coulomb repulsion for f electrons and solve the linearized Eliashberg equation within the third-order perturbation theory to investigate the superconducting symmetry in UTe2. The most likely state is found to be an s-wave state with a highly anisotropic superconducting gap structure that exhibits a point-node-like behavior of the specific heat at low temperatures.
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