Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 25: Correlated Electrons: Low-Dimensional Systems - Models 3

TT 25.8: Vortrag

Dienstag, 12. März 2013, 11:45–12:00, H9

Impurity effects in frustrated magnets with subextensive degeneracies — •Stefan Bittihn and Simon Trebst — Universität zu Köln, Germany

We consider the effects of local impurities in frustrated honeycomb-lattice antiferromagnets, which exhibit large but nonextensive ground-state degeneracies. In the absence of impurities magnetic order is induced via a thermal order-by-disorder mechanism. In the presence of impurities this entropic selection of states is put into competition with an energetic selection of states favored by the impurities, a more conventional order by quenched disorder mechanism. We characterize the latter via extensive numerical simulations on large-scale lattices.