Inhomogeneous superconducting state probed by Te NMR on UTe

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

UTe is a recently discovered promising candidate for a spin-triplet superconductor. In contrast to conventional spin-singlet superconductivity, spin-triplet superconductivity possesses spin and angular momentum degrees of freedom. We previously reported that the shoulder signal appears in NMR spectra below the superconducting (SC) transition temperature in , and a slight decrease in the Knight shift along the and axes ( and , respectively) below at a low magnetic field . Although the decrease in vanished above 5.5 T, the decrease in was independent of up to 6.5 T. To clarify the origin of the shoulder signal and the trace of the decrease in , we compared the Te-NMR spectra obtained when and and measured the Te-NMR spectra for up to 14.5 T.