Work

Possible Unconventional s-Wave Pairing with Point-Node–Like Gap Structure in UTe2

Year: 2024

Type: article

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 $(0, \pm π, 0)$ 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 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.

Source: Journal of the Physical Society of Japan

DOI: 10.7566/jpsj.93.063701

Authors: Shingo Haruna, Takuji Nomura, Hirono Kaneyasu

Institutions: University of Hyogo, Hyogo University, National Institutes for Quantum Science and Technology, Sanyo-Onoda City University

Language: English

Topic: Rare-earth and actinide compounds

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funder: Iketani Science and Technology Foundation

OpenAlex ID: W4396227560

FWCI: 1.01

Cites: 43

Cited by: 7

Related to: 10