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Anomalous low-field diamagnetic response in ultraclean URu$$_2$$Si$$_2$$ superconductor

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

The low critical field $$H_{rm c1}$$ in ultraclean URu$$_2$$Si$$_2$$ single crystals with residual resistivity ration exceeding 700 is precisely determined. The whole $$H_{rm c1}$$ for $$H parallel a$$ can be explained by the two-gap with line and point nodes. In contrast, for $$H parallel c$$ a distinct kink in the slope of $$H_{rm c1}$$ was found at 1.2 K, which cannot be accounted for by the two-gap. This outstanding anomaly demonstrates a highly unusual superconducting state embedded in the hidden order state possibly related to the time reversal symmetry breaking.



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