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25 April 2024

» arxiv » 1204.3785

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From multiferroics to cosmology: Scaling behaviour and beyond in the hexagonal manganites
S. M. Griffin ; M. Lilienblum ; K. Delaney ; Y. Kumagai ; M. Fiebig ; N. A. Spaldin ;
Date:	17 Apr 2012
Abstract:	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.
Source:	arXiv, 1204.3785
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