title: Non-Fermi-Liquid Behavior and Anomalous Suppression of Landau Damping in Layered Metals Close to Ferromagnetism.
abstract: We analyze the low-energy physics of nearly ferromagnetic metals in two spatial dimensions using the functional renormalization group technique. We find a new low-energy fixed point, at which the fermionic (electronlike) excitations are non-Fermi-liquid (z_{f}=13/10) and the magnetic fluctuations exhibit an anomalous Landau damping whose rate vanishes as Γ_{q}∼|q|^{3/5} in the low-|q| limit. We discuss this renormalization of the Landau-damping exponent, which is the major novel prediction of our work, and highlight the possible link between that renormalization and neutron-scattering data on UGe_{2} and related compounds. Implications of our analysis for YFe_{2}Al_{10} are also discussed.
authors.affiliation: Scottish Universities Physics Alliance, School of Physics and Astronomy, University of Saint Andrews, North Haugh, Saint Andrews, Fife KY16 9SS, United Kingdom.
authors.forename: Sam P
authors.initials: SP
authors.lastname: Ridgway
authors.affiliation: Scottish Universities Physics Alliance, School of Physics and Astronomy, University of Saint Andrews, North Haugh, Saint Andrews, Fife KY16 9SS, United Kingdom.
authors.forename: Chris A
authors.initials: CA
authors.lastname: Hooley