Effect of uranium deficiency on normal and superconducting properties in unconventional superconductor UTe

Haga, Yoshinori   ; Opletal, P.  ; Tokiwa, Yoshifumi  ; Yamamoto, Etsuji  ; Tokunaga, Yo  ; Kambe, Shinsaku  ; Sakai, Hironori   

Single crystals of the unconventional superconductor UTe have been grown in various conditions. Superconducting samples are nearly stoichiometric within an experimental error of about 1%, while non-superconducting sample significantly deviates from the ideal composition. The superconducting UTe showed that the large density of states was partially gapped in the normal state, while the non-superconducting sample is characterized by the relatively large electronic specific heat as reported previously.