Periodic Anderson model for magnetism and superconductivity in UTe2

Jun Ishizuka and Youichi Yanase
Phys. Rev. B 103, 094504 – Published 5 March 2021

Abstract

We provide and analyze a periodic Anderson model for studying magnetism and superconductivity in UTe2, a recently discovered candidate for a topological spin-triplet superconductor. The 24-band tight-binding model reproduces the band structure obtained from a DFT+U calculation consistent with an angle-resolved photoemission spectroscopy. The Coulomb interaction of f-electrons enhances Ising ferromagnetic fluctuation along the a-axis and stabilizes spin-triplet superconductivity of either B3u or Au symmetry. When effects of pressure are taken into account in hopping integrals, the magnetic fluctuation changes to an antiferromagnetic one, and accordingly spin-singlet superconductivity of Ag symmetry is stabilized. Based on the results, we propose pressure-temperature and magnetic field-temperature phase diagrams revealing multiple superconducting phases as well as an antiferromagnetic phase. In particular, a mixed-parity superconducting state with spontaneous inversion symmetry breaking is predicted.

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  • Received 4 August 2020
  • Revised 30 November 2020
  • Accepted 27 January 2021

DOI:https://doi.org/10.1103/PhysRevB.103.094504

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jun Ishizuka1 and Youichi Yanase1,2

  • 1Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
  • 2Institute for Molecular Science, Okazaki 444-8585, Japan

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Issue

Vol. 103, Iss. 9 — 1 March 2021

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