title: Exotic superconducting properties in the electron-hole-compensated heavy-fermion "Semimetal" URu2Si2.
abstract: 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.
authors.affiliation: Department of Physics, Kyoto University, Kyoto 606-8502, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Kasahara
authors.forename: T
authors.initials: T
authors.lastname: Iwasawa
authors.forename: H
authors.initials: H
authors.lastname: Shishido
authors.forename: T
authors.initials: T
authors.lastname: Shibauchi
authors.forename: K
authors.initials: K
authors.lastname: Behnia
authors.forename: Y
authors.initials: Y
authors.lastname: Haga
authors.forename: T D
authors.initials: TD
authors.lastname: Matsuda
authors.forename: Y
authors.initials: Y
authors.lastname: Onuki
authors.forename: M
authors.initials: M
authors.lastname: Sigrist
authors.forename: Y
authors.initials: Y
authors.lastname: Matsuda