Violation of the orbital depairing limit in a nonunitary state: High-field phase in the heavy fermion superconductor UTe2
Kazushige Machida
DOI 10.1103/PhysRevB.107.224512 · Physical Review B
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Abstract
A theoretical study is reported on the origin of an extremely high upper critical field ∼70 T observed in UTe2 with the transition temperature Tc=1.6–2 K, which exceeds the conventional orbital depairing limit set by the Fermi velocity and Tc for a superconductor (SC) in the clean limit. We investigate possible violation of the orbital limit in terms of a spin-triplet nonunitary state, which is effectively coupled to the underlying magnetization induced by an external field. This produces the reduced internal field by canceling it via magnetization. We formulate a theory within the Ginzburg-Landau framework to describe this orbital limit violation and analyze experimental data on the upper critical fields for various field orientations in UTe2. We show that the orbital limit violation for a spin-triplet SC, as well as the Pauli-Clogston limit violation for a spin-singlet SC, constitutes a complete and useful framework for examining the high field physics of superconductors in the clean limit.
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. | 1.6 | Pressure not reported | unknown |
| UTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2 | Pressure not reported | unknown |
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