Magnetism and superconductivity in mixed-dimensional periodic Anderson model for UTe2

Ryuji Hakuno; Kosuke Nogaki; Youichi Yanase

doi:10.1103/PhysRevB.109.104509

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Magnetism and superconductivity in mixed-dimensional periodic Anderson model for UTe2

Ryuji Hakuno, Kosuke Nogaki, Youichi Yanase

DOI 10.1103/PhysRevB.109.104509 · Physical Review B

T1

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Abstract

UTe2 is a strong candidate for a topological spin-triplet superconductor, and it is considered that the interplay of magnetic fluctuation and superconductivity is essential for the origin of the superconductivity. Despite various experiments suggesting ferromagnetic criticality, neutron scattering measurements observed only antiferromagnetic fluctuation and called for theories of spin-triplet superconductivity near the antiferromagnetic quantum critical point. We construct a periodic Anderson model with one-dimensional conduction electrons and two- or three-dimensional f electrons, reminiscent of the band structure of UTe2, and show that ferromagnetic and antiferromagnetic fluctuations are reproduced depending on the Fermi surface of f electrons. These magnetic fluctuations cooperatively stabilize spin-triplet p-wave superconductivity. We also study hybridization dependence as a possible origin of the pressure-induced superconducting phase transition and find that moderately large hybridization changes the antiferromagnetic wave vector and stabilizes d-wave superconductivity.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
UTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown