Fully gapped pairing state in spin-triplet superconductor UTe

Suetsugu, Shota*; Sakai, Hironori   ; Opletal, P.  ; Tokiwa, Yoshifumi  ; Haga, Yoshinori   ; 12 of others*

The superconducting gap structure of UTe was determined by the thermal conductivity measurement on ultra-clean UTe single crystals. The result demonstrates the absence of nodes around the -axis, contrary to the previous study. The finding reveals that UTe is likely to be a long-sought three-dimensional strong topological superconductor.