Dresden 2017 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 15: Ferroics - Domains, Domain Walls and Skyrmions III

DF 15.7: Vortrag

Mittwoch, 22. März 2017, 17:00–17:15, WIL B321

Kibble-Zurek mechanism in RMnO₃ — •Quintin Meier¹, Andres Cano^1,2, Martin Lilienblum¹, Manfred Fiebig¹, and Nicola A. Spaldin¹ — ¹ETH Zürich, Department of Materials, Zürich, Switzerland — ²CNRS, Univ. Bordeaux, ICMCB, UPR 9048, F-33600 Pessac, France

We use density functional and Landau-Ginzburg theories to investigate the role of critical fluctuations on the structural phase transition in the ferroelectric hexagonal manganites RMnO₃ (R = Y or a element of the rare-earth series). These multiferroic materials are of interest because their improper ferroelectricity leads to an unusual domain structure that has been interpreted in terms of the Kibble-Zurek mechanism in the fluctuation dominated Ginzburg regime [1]. We discuss the effect of critical fluctuations and their influence on the Kibble-Zurek mechanism by studying trends in the domain-formation behavior across the series by comparing with new experimental data.

[1]Griffin, S. M., Lilienblum, M., Delaney, K. T., Kumagai, Y., Fiebig, M., & Spaldin, N. A. (2012) Physical Review X, 2(4), 041022.