title: Spin-triplet superconductivity in UNi(2)Al(3) revealed by the (27)Al Knight shift measurement.
abstract: We report (27)Al Knight shift ( (27)K) measurement on a single-crystal UNi(2)Al(3) that reveals a coexistence of superconductivity and a spin-density-wave (SDW) type of magnetic ordering ( T(SDW) = 4.5 K). The spin part of (27)K, (27)K(s), does not change down to 50 mK across the superconducting (SC) transition temperature T(c) approximately 0.9 K. In contrast with the isostructural compound UPd(2)Al(3) ( T(c) approximately 2 K), which was identified to be a spin-singlet d-wave superconductor, the behavior of (27)K strongly supports that UNi(2)Al(3) , like UPt(3) and Sr(2)RuO(4), belongs to a class of spin-triplet SC pairing state superconductors.
authors.affiliation: Department of Physical Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Ishida
authors.forename: D
authors.initials: D
authors.lastname: Ozaki
authors.forename: T
authors.initials: T
authors.lastname: Kamatsuka
authors.forename: H
authors.initials: H
authors.lastname: Tou
authors.forename: M
authors.initials: M
authors.lastname: Kyogaku
authors.forename: Y
authors.initials: Y
authors.lastname: Kitaoka
authors.forename: N
authors.initials: N
authors.lastname: Tateiwa
authors.forename: N K
authors.initials: NK
authors.lastname: Sato
authors.forename: N
authors.initials: N
authors.lastname: Aso
authors.forename: C
authors.initials: C
authors.lastname: Geibel
authors.forename: F
authors.initials: F
authors.lastname: Steglich