title: Preasymptotic critical behavior and effective exponents in disordered metallic quantum ferromagnets.
abstract: We determine the preasymptotic critical behavior at the quantum ferromagnetic transition in strongly disordered metals. We find that it is given by effective power laws, in contrast to the previously analyzed asymptotic critical behavior, which is valid only in an unobservably small region. The consequences for analyzing experiments are discussed, in particular, ways to distinguish between critical behavior and Griffiths-phase effects.
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
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