Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 18: Correlated Electrons: Spin Systems and Itinerant Magnets – Frustrated Magnets 2 (jointly with MA)
TT 18.10: Vortrag
Montag, 16. März 2015, 17:30–17:45, H 3005
Non-linear susceptibility of spin ice from the Wien effect — •Vojtěch Kaiser1,2, Steven T. Bramwell3, Peter C.W. Holdsworth2, and Roderich Moessner1 — 1Max-Planck-Institut für Physik komplexer Systeme, Dresden, Germany — 2École normale supérieure de Lyon, Lyon, France — 3London Centre for Nanotechnology, University College London, London, UK
We give predictions for the non-linear magnetic response of the emergent Coulomb fluid of magnetic monopoles in spin ice. To this end, we combine the increase of the monopole density due to the second Wien effect with the magnetization dynamics of spin ice. Non-linearities that occur thanks to this coupling between monopoles and spins manifest themselves in computer simulations and are explained by a simple kinetic model. At longer times, spin ice magnetizes which renders the density increase transient unless the field direction is changed periodically. Strikingly, for certain frequencies the non-equilibrium non-linear response due to the Wien effect in spin ice is indistinguishable from an electrolyte. Studying the response to harmonic driving with large amplitude allows us to define a non-linear susceptibility of spin ice as a potential experimental signature of these phenomena.