Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 7: Correlated Electrons: Spin Systems, Itinerant Magnets 1
TT 7.11: Vortrag
Montag, 11. März 2013, 12:15–12:30, H19
Electric Field Response of Coulombic Charge Ice — •Paul McClarty1, Aroon O'Brien2, Frank Pollmann1, and Roderich Moessner1 — 1MPI PKS, Noethnitzer Strasse 38, 01187, Dresden, Germany — 2School of Physics, University of Sydney, Sydney, Australia
Coulomb phases are states of matter which arise in certain geometrically frustrated systems. They are characterized by an emergent low energy gauge freedom which entails the existence of particular anisotropic correlations and fractionalized excitations. The archetypal example of such a state of matter is the spin ice state which appears in some rare earth magnets. Here we consider a manifestation of a Coulomb phase in a model inspired by certain mixed valence ferrites including magnetite. In zero field, we were able to treat this Coulombic charge ice model and the dipolar spin ice model on an equal footing by mapping both to a constrained charge model on the diamond lattice. We found that states of the two ice models are related by a staggering field which is reflected in the energetics of these two models. In this talk, we focus on the screening, within the Coulomb phase, of the long range interaction and the response of charge ice to a static external electric field.