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Condensed Matter > Superconductivity
Title: Unconventional $s$-Wave Pairing with Point-Node-Like Gap Structure in UTe$_2$
(Submitted on 18 Dec 2023 (v1), last revised 2 May 2024 (this version, v4))
Abstract: We explore the pairing state and gap structure of UTe$_2$ 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 $(0, \pm \pi, 0)$ 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 UTe$_2$. 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.
Submission history
From: Shingo Haruna [view email][v1] Mon, 18 Dec 2023 02:19:21 GMT (1982kb,D)
[v2] Sun, 17 Mar 2024 05:40:09 GMT (2113kb,D)
[v3] Tue, 2 Apr 2024 21:05:44 GMT (2113kb,D)
[v4] Thu, 2 May 2024 05:37:26 GMT (2113kb,D)
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