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Anomalous temperature dependence of lower critical field in ultraclean URu$$_2$$Si$$_2$$

Okazaki, Ryuji*; Shimozawa, Masaaki*; Shishido, Hiroaki*; Konczykowski, M.*; Haga, Yoshinori; Matsuda, Tatsuma; Yamamoto, Etsuji; Onuki, Yoshichika; Yanase, Yoichi*; Shibauchi, Takasada*; Matsuda, Yuji*

Lower critical field $$H_{rm c1}$$ of the heavy fermion superconductor URu$$_2$$Si$$_2$$ has been investigated on a ultra clean sample. The whole $$H_{rm c1}$$ ($$T$$) along the $$a$$ axis is well explained by the two superconducting gap structures with line and point nodes. On the other hand, $$H_{rm c1}$$ along the $$c$$ axis shows a distinct kink around 1 K, well below the superconducting transition temperature. The observed anomalous response is possibly related to a peculiar vortex dynamics associated with chiral domains.

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Category:Physics, Multidisciplinary

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