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Superconducting properties of heavy fermion UTe$$_2$$ revealed by $$^{125}$$Te-nuclear magnetic resonance

Nakamine, Genki*; Kitagawa, Shunsaku*; Ishida, Kenji*; Tokunaga, Yo  ; Sakai, Hironori   ; Kambe, Shinsaku  ; Nakamura, Ai*; Shimizu, Yusei*; Homma, Yoshiya*; Li, D.*; Honda, Fuminori*; Aoki, Dai*

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 $$T_{rm c}$$ 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 $$T_{rm c}$$, 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.



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Category:Physics, Multidisciplinary



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