No abstract

We have performed the 125 Te-nuclear magnetic resonance (NMR) measurement in the field along the b axis on the newly discovered superconductor UTe 2 , which is a candidate of a spin-triplet superconductor. The nuclear spin-lattice relaxation rate divided by temperature 1/T 1 T abruptly decreases below a superconducting (SC) transition temperature T c without showing a coherence peak, indicative of UTe 2 being an unconventional superconductor. It was found that the temperature dependence of 1/T 1 T in the SC state cannot be understood by a single SC gap behavior but can be explained by a two SC gap model. The Knight shift, proportional to the spin susceptibility, decreases below T c , but the magnitude of the decrease is much smaller than the decrease expected in the spin-singlet pairing. Rather, the small Knight-shift decrease as well as the absence of the Pauli-depairing effect can be interpreted by the spin triplet scenario.

No abstract

No abstract

No abstract