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Effect of uranium deficiency on normal and superconducting properties in unconventional superconductor UTe$$_2$$

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

Single crystals of the unconventional superconductor UTe$$_2$$ 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$$_2$$ 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.

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