Anomalous vortex dynamics in spin-triplet superconductor UTe${}_2$

Abstract

The vortex dynamics in the spin-triplet superconductor, UTe${}_2$, are studied by measuring the DC electrical resistivity with currents along the $a$-axis under magnetic fields along the $b$-axis. Surprisingly, we have discovered an island region of low critical current deep inside the superconducting (SC) state, well below the SC upper critical field, attributed to a weakening of vortex pinning. Notably, this region coincides with the recently proposed intermediate-field SC state. We discuss the possibility of nonsingular vortices in the intermediate state, where SC order parameter does not vanish entirely in the vortex cores due to the mixing of multiple SC components.

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Cited by in corpus (7)

• A review of UTe${}_2$ at high magnetic fields
• c axis electrical transport at the metamagnetic transition in the heavy-fermion superconductor UTe2 under pressure
• Spectroscopic evidence of symmetry breaking in the superconducting vortices of UTe2
• Competition of vortex core structures in superfluid ${}^3$He-B
• Field-angle evolution of the superconducting and magnetic phases of UTe${}_2$ around the $b$ axis
• Superconducting meron phase in locally noncentrosymmetric superconductors
• Boosted magnetic fluctuations at the onset of superconductivity in UTe${}_2$ beyond 40 T