Scaling Behavior and Beyond Equilibrium in the Hexagonal Manganites
2012; American Physical Society; Volume: 2; Issue: 4 Linguagem: Inglês
10.1103/physrevx.2.041022
ISSN2160-3308
AutoresSinéad M. Griffin, Martin Lilienblum, Kris T. Delaney, Yu Kumagai, M. Fiebig, Nicola A. Spaldin,
Tópico(s)Multiferroics and related materials
ResumoWe 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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