title: Anisotropic spin fluctuations and superconductivity in "115" heavy fermion compounds: ⁵⁹Co NMR study in PuCoGa₅.
abstract: We report results of ⁵⁹Co nuclear magnetic resonance measurements on a single crystal of superconducting PuCoGa₅ in its normal state. The nuclear spin-lattice relaxation rates and the Knight shifts as a function of temperature reveal an anisotropy of spin fluctuations with finite wave vector q. By comparison with the isostructural members, we conclude that antiferromagnetic XY-type anisotropy of spin fluctuations plays an important role in mediating superconductivity in these heavy fermion materials.
authors.affiliation: Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. sbaek.fu@gmail.com
authors.forename: S-H
authors.initials: SH
authors.lastname: Baek
authors.forename: H
authors.initials: H
authors.lastname: Sakai
authors.forename: E D
authors.initials: ED
authors.lastname: Bauer
authors.forename: J N
authors.initials: JN
authors.lastname: Mitchell
authors.forename: J A
authors.initials: JA
authors.lastname: Kennison
authors.forename: F
authors.initials: F
authors.lastname: Ronning
authors.forename: J D
authors.initials: JD
authors.lastname: Thompson