Exotic superconducting properties in the electron-hole-compensated heavy-fermion "Semimetal" URu2Si2

We show that the charge and thermal transport measurements on ultraclean crystals of URu2Si2 reveal a number of unprecedented superconducting properties. The uniqueness is best highlighted by the peculiar field dependence of thermal conductivity including the first-order transition at Hc2 with a red...

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Bibliographic Details
Published inPhysical review letters Vol. 99; no. 11; p. 116402
Main Authors Kasahara, Y, Iwasawa, T, Shishido, H, Shibauchi, T, Behnia, K, Haga, Y, Matsuda, T D, Onuki, Y, Sigrist, M, Matsuda, Y
Format Journal Article
LanguageEnglish
Published United States 14.09.2007
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Summary:We show that the charge and thermal transport measurements on ultraclean crystals of URu2Si2 reveal a number of unprecedented superconducting properties. The uniqueness is best highlighted by the peculiar field dependence of thermal conductivity including the first-order transition at Hc2 with a reduction of entropy flow. This is a consequence of multiband superconductivity with compensated electronic structure in the hidden order state of this system. We provide strong evidence for a new type of unconventional superconductivity with two distinct gaps having different nodal topology.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.99.116402