First observation of the de Haas-van Alphen effect and Fermi surfaces in the unconventional superconductor UTe

Aoki, Dai*; Sakai, Hironori   ; Opletal, P.  ; Tokiwa, Yoshifumi  ; Ishizuka, Jun*; Yanase, Yoichi*; Harima, Hisatomo*; Nakamura, Ai*; Li, D.*; Homma, Yoshiya*; Shimizu, Yusei*; Knebel, G.*; Flouquet, J.*; Haga, Yoshinori   

de Haas-van Alphen oscillation was successfully observed in an unconventional superconductor UTe using high-quality single crystals. From this observation, Fermi surfaces of this compound were determined to be cylinders elongated along the c-direction, in consistent with theoretical expectation. However, the extremely large cyclotron effective masses ranging 32 to 57 m, in consistent with the electronic specific heat, far exceed calculated values.