Spin-orbit coupling induced degeneracy in the anisotropic unconventional superconductor UTe2
Alexander B. Shick, Warren E. Pickett
DOI 10.1103/PhysRevB.100.134502 · Physical Review B
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Abstract
The orthorhombic uranium dichalcogenide UTe2 displays superconductivity below 1.7 K, with the anomalous feature of retaining 50% of normal state (ungapped) carriers, according to heat capacity data from two groups. Incoherent transport that crosses over from above 50 K toward a low-temperature, Kondo lattice Fermi liquid regime indicates strong magnetic fluctuations and the need to include correlation effects in theoretical modeling. We report density functional theory plus Hubbard U (DFT+U) results for UTe2 to provide a platform for modeling its unusual behavior, focusing on ferromagnetic (FM, time-reversal breaking) long-range correlations along the â axis as established by magnetization measurements and confirmed by our calculations. States near the Fermi level are dominated by the j=52 configuration, with the jz=±12 sectors being effectively degenerate and half-filled. Unlike the small-gap insulating nonmagnetic electronic spectrum, the FM Fermi surfaces are large (strongly metallic) and display low-dimensional features, reminiscent of the FM superconductor UGe2.
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. | 1.7 | Pressure not reported | unknown |
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