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Maki parameter and upper critical field of the heavy-fermion superconductor UBe$$_{13}$$

重い電子系超伝導体UBe$$_{13}$$のMakiパラメータ及び上部臨界磁場

清水 悠晴*; 池田 陽一*; 若林 琢巳*; 芳賀 芳範; 天谷 健一*; 日高 宏之*; 柳澤 達也*; 網塚 浩*

Shimizu, Yusei*; Ikeda, Yoichi*; Wakabayashi, Takumi*; Haga, Yoshinori; Tenya, Kenichi*; Hidaka, Hiroyuki*; Yanagisawa, Tatsuya*; Amitsuka, Hiroshi*

Low-temperature specific heat measurements under magnetic field were performed on a single crystal UBe$$_{13}$$. The specific heat shows a $$T^3$$ behavior below $$sim$$0.7 $$T$$$$_{rm c}$$, where $$T$$$$_{rm c}$$ is the superconducting transition temperature, suggesting the existence of point nodes in the superconducting gap. Together with the isotropic behavior of the upper critical magnetic field, the symmetry of the Cooper paring is discussed.

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パーセンタイル:45.48

分野:Physics, Multidisciplinary

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