Novel H c2 suppression mechanism in a spin triplet superconductor -- Application to UTe2--
Abstract
A novel H c2 suppression mechanism is theoretically proposed in a spin triplet superconductor (SC) with equal spin pairs. We show that the upper critical field H c2 can be reduced from the orbital depairing limit H orb c2 to arbitrarily small value, keeping the second order phase transition nature. This mechanism is sharply different from the known Pauli-Clogston limit for a spin singlet SC where the reduction is limited to 0.3H orb c2 with the first order transition when the Maki parameter goes infinity. This novel H c2 suppression mechanism is applied to UTe2, which is a prime candidate for a spin triplet SC, to successfully analyze the H c2 data for various crystalline orientations both under ambient and applied pressure, and to identify the pairing symmetry. It is concluded that the non-unitary spin triplet state with equal spin pairs is realized in UTe2, namely ( b+i c)ka in 3B 3u which is classified under finite spin orbit coupling scheme.
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