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TT: Fachverband Tiefe Temperaturen

TT 40: Poster Session Correlated Electrons

TT 40.41: Poster

Mittwoch, 13. März 2013, 15:00–19:00, Poster D

Spin dynamics in swedenborgites — •Stefan Buhrandt — Universität Köln

Swedenborgites are magnetic systems of stacked Kagome and triangular lattices that exhibit strong geometric frustration due to antiferromagnetic coupling between all ions. In the most simple model, these systems are described with only two distinct antiferromagnetic next neighbor interactions, one inside and one out of the Kagome layers. Depending on their ratio, the groundstate is either unique or highly degenerated. In the latter case, these systems show interesting dynamics in the sense that one finds flat bands in spin-wave calculations as well as zero-mode signatures in the specific heat within classical Monte Carlo simulations. We discuss the appearance of these zero-modes in dependence on the ratio of the antiferromagnetic couplings and compare to experimental findings on the compund CaBaCo₂Fe₂O₇.