title: Disorder dependence of the ferromagnetic quantum phase transition.
abstract: We quantitatively discuss the influence of quenched disorder on the ferromagnetic quantum phase transition in metals, using a theory that describes the coupling of the magnetization to gapless fermionic excitations. In clean systems, the transition is first order below a tricritical temperature T_{tc}. Quenched disorder is predicted to suppress T_{tc} until it vanishes for residual resistivities ρ_{0} on the order of several μΩ cm for typical quantum ferromagnets. We discuss experiments that allow us to distinguish the mechanism considered from other possible realizations of a first-order transition.
authors.affiliation: Department of Physics and Institute of Theoretical Science, University of Oregon, Eugene, Oregon 97403, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Sang
authors.affiliation: Department of Physics and Institute of Theoretical Science, University of Oregon, Eugene, Oregon 97403, USA and Materials Science Institute, University of Oregon, Eugene, Oregon 97403, USA.
authors.forename: D
authors.initials: D
authors.lastname: Belitz
authors.affiliation: Institute for Physical Science and Technology, and Department of Physics, University of Maryland, College Park, Maryland 20742, USA.
authors.forename: T R
authors.initials: TR
authors.lastname: Kirkpatrick