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

非従来型超伝導体UTeにおける最初のドハース・ファンアルフェン効果観測とフェルミ面

青木 大*; 酒井 宏典   ; Opletal, P.  ; 常盤 欣文  ; 石塚 淳*; 柳瀬 陽一*; 播磨 尚朝*; 仲村 愛*; Li, D.*; 本間 佳哉*; 清水 悠晴*; Knebel, G.*; Flouquet, J.*; 芳賀 芳範   

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.