Superconductivity in UTe2 from local noncentrosymmetricity
Ryuji Hakuno, Youichi Yanase
DOI 10.1103/6565-2xg8 · Physical Review B
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Abstract
Superconductivity in UTe2 has attracted significant attention, as it is widely recognized as a promising candidate for a spin-triplet superconductor. However, the symmetry of superconductivity and the microscopic origin of spin-triplet pairing remain subjects of debate. Nevertheless, various experiments imply an intimate coupling between magnetism and superconductivity. In this paper, we analyze a multisublattice periodic Anderson model that incorporates spin-orbit coupling allowed in locally noncentrosymmetric crystals to discuss magnetic fluctuations and superconductivity in UTe2. Due to the sublattice-dependent spin-orbit coupling, magnetic fluctuations become anisotropic, and the spin degeneracy of superconducting states is lifted. Our calculations reveal anisotropic antiferromagnetic fluctuations along the b and c axes, anisotropic ferromagnetic fluctuations along the a axis, and their coexistence. These fluctuations can be tuned by the f electron's level. Superconductivity in the Au representation is predominant for a wide range of parameters, whereas the B2u representation is almost degenerate and can be stabilized. The direction of the d vector changes as we increase the spin-orbit coupling. We discuss the consistency between our results and several experiments.
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 |
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