title: Electric quadrupolar contribution to the nuclear spin-lattice relaxation of Ir in Fe.
abstract: We report on the first quantitative determination of the electric quadrupolar contribution to the nuclear spin-lattice relaxation in a transition metal. For 186Ir and 189Ir in Fe we have determined the magnetic and the electric quadrupolar part of the relaxation for magnetic fields between 0.01 and 2 T. The quadrupolar part gives information on the role of the orbital motion of the electrons for the relaxation process. Our results prove that the unexpected high relaxation rates in Fe and their magnetic field dependence are due to a nonorbital relaxation mechanism.
authors.affiliation: Physik-Department, Technische Universität München, D-85748 Garching, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Seewald
authors.forename: E
authors.initials: E
authors.lastname: Zech
authors.forename: H J
authors.initials: HJ
authors.lastname: Körner
authors.forename: D
authors.initials: D
authors.lastname: Borgmann
authors.forename: M
authors.initials: M
authors.lastname: Dietrich