title: Time-reversal symmetry-breaking superconductivity in heavy-fermion PrOs4Sb12 detected by muon-spin relaxation.
abstract: We report on muon-spin relaxation measurements of the 4f(2)-based heavy-fermion superconductor filled-skutterudite Pr(Os4Sb12. The results reveal the spontaneous appearance of static internal magnetic fields below the superconducting transition temperature, providing unambiguous evidence for the breaking of time-reversal symmetry in the superconducting state. A discussion is made on which of the spin or orbital component of Cooper pairs carries a nonzero momentum.
authors.affiliation: Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Aoki
authors.forename: A
authors.initials: A
authors.lastname: Tsuchiya
authors.forename: T
authors.initials: T
authors.lastname: Kanayama
authors.forename: S R
authors.initials: SR
authors.lastname: Saha
authors.forename: H
authors.initials: H
authors.lastname: Sugawara
authors.forename: H
authors.initials: H
authors.lastname: Sato
authors.forename: W
authors.initials: W
authors.lastname: Higemoto
authors.forename: A
authors.initials: A
authors.lastname: Koda
authors.forename: K
authors.initials: K
authors.lastname: Ohishi
authors.forename: K
authors.initials: K
authors.lastname: Nishiyama
authors.forename: R
authors.initials: R
authors.lastname: Kadono