2020/08/31 by Jun Ishizuka, Youichi Yanase
Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Condensed matter physics #Ferromagnetism #Ising model #Magnetism #Physics #Rare-earth and actinide compounds #Superconductivity #Topological Materials and Phenomena #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.103.094504
published as Phys. Rev. B 103, 094504 (2021) · 9 pages, 9 figures
openalex created_date 2020/08/10 · arxiv created 2021/03/03 · openalex publication_date 2021/03/05 · arxiv updated 2021/03/10 · openalex updated_date 2026/08/06
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.