title: ac Wien Effect in Spin Ice, Manifest in Nonlinear, Nonequilibrium Susceptibility.
abstract: The Wien effect is a model process for field-induced charge creation. Here it is derived for a nonelectrical system: the spin ice "magnetolyte"-a unique system showing perfect charge symmetry. An entropic reaction field, analogous to the Jaccard field in ice, opposes direct current, but a frequency window exists in which the Wien effect for magnetolyte and electrolyte are indistinguishable. The universal enhancement of monopole density speeds up the magnetization dynamics, which manifests in the nonlinear, nonequilibrium ac susceptibility. This is a rare instance where such effects may be calculated, providing new insights for electrolytes. Experimental predictions are made for Dy2Ti2O7 spin ice.
authors.affiliation: Laboratoire de Physique, École Normale Supérieure de Lyon, CNRS, 69364 Lyon CEDEX 07, France.|Max-Planck-Institut für Physik komplexer Systeme, 01187 Dresden, Germany.
authors.forename: V
authors.initials: V
authors.lastname: Kaiser
authors.affiliation: London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, London WC1H 0AH, United Kingdom.
authors.forename: S T
authors.initials: ST
authors.lastname: Bramwell
authors.affiliation: Laboratoire de Physique, École Normale Supérieure de Lyon, CNRS, 69364 Lyon CEDEX 07, France.
authors.forename: P C W
authors.initials: PC
authors.lastname: Holdsworth
authors.affiliation: Max-Planck-Institut für Physik komplexer Systeme, 01187 Dresden, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Moessner