Abstract
We provide and analyze a periodic Anderson model for studying magnetism and superconductivity in , a recently discovered candidate for a topological spin-triplet superconductor. The 24-band tight-binding model reproduces the band structure obtained from a calculation consistent with an angle-resolved photoemission spectroscopy. The Coulomb interaction of -electrons enhances Ising ferromagnetic fluctuation along the -axis and stabilizes spin-triplet superconductivity of either or 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 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.
2 More- Received 4 August 2020
- Revised 30 November 2020
- Accepted 27 January 2021
DOI:https://doi.org/10.1103/PhysRevB.103.094504
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