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Exotic superconducting state embedded in the hidden order state of URu$$_2$$Si$$_2$$

Matsuda, Yuji*; Okazaki, Ryuji*; Kasahara, Yuichi*; Shishido, Hiroaki*; Shibauchi, Takasada*; Haga, Yoshinori; Matsuda, Tatsuma; Onuki, Yoshichika

We report charge and thermal transport measurements on ultra clean single crystals of the superconductor with the hidden-order state URu$$_2$$Si$$_2$$. The results provide strong evidence for a new type of unconventional superconductivity with two distinct gaps having different nodal topology. We propose a gap function with chiral $$d$$-wave form. We also demonstrate that a distinct flux line lattice melting transition with outstanding characters occurs well below the upper critical fields even at sub-Kelvin temperature.

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Category:Physics, Applied

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