Anomalous vortex dynamics in the spin-triplet superconductor UTe2
Y. Tokiwa, H. Sakai, S. Kambe, P. Opletal, E. Yamamoto, M. Kimata, S. Awaji, T. Sasaki, Y. Yanase, Y. Haga, Y. Tokunaga
DOI 10.1103/PhysRevB.108.144502 · Physical Review B
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Abstract
The vortex dynamics in the spin-triplet superconductor UTe2 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 the SC order parameter does not vanish entirely in the vortex cores due to the mixing of multiple SC components.
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. | 2.1 | Pressure not reported | unknown |
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