From multiferroics to cosmology: Scaling behaviour and beyond in the hexagonal manganites

Details From multiferroics to cosmology: Scaling behaviour and beyond in the hexagonal manganites From multiferroics to cosmology: Scaling behaviour and beyond in the hexagonal manganites

2012-04-17

arxiv.org/abs/1204.3785v1

Physics

Condensed Matter

Materials Science

Scientific paper

We show that the improper ferroelectric phase transition in the multiferroic hexagonal manganites displays the same symmetry-breaking characteristics as those proposed in early-universe theories. We present an analysis of the Kibble-Zurek theory of topological defect formation applied to the hexagonal manganites, discuss the conditions determining the range of cooling rates in which Kibble-Zurek behavior is expected, and show that recent literature data are consistent with our predictions. We explore experimentally for the first time to our knowledge the cross-over out of the Kibble-Zurek regime and find a surprising "anti-Kibble-Zurek" behavior.

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