Dresden 2017 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 11: Ferroics - Domains, Domain Walls and Skyrmions II
DF 11.10: Vortrag
Mittwoch, 22. März 2017, 12:45–13:00, WIL B321
Influence of domain walls on the electrocaloric effect — •Anna Grünebohm1, Madhura Marathe2, and Claude Marathe2 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen, Germany — 2Materials Theory, ETH Zürich, Switzerland
The electrocaloric effect (ECE) is the adiabatic temperature change of a material in a varying external electrical field which is promising for novel cooling devices [1]. However, a large ECE is restricted to a small temperature range, which is above room temperature for standard ferroelectrics such as BaTiO3. One way to shift the operation temperature is epitaxial strain [2,3]. Most important, tensile strain stabilizes a multi-domain ferroelectric phase which can enhance the caloric response in a broad temperature interval. We discuss the coupling between ferroelectric domains and the external electric field and its impact on the ECE by means of ab initio based simulations.
[1] X. Moya, et al., Nature Mater. 13, 439 (2014).
[2] M. Marathe, et al., Appl.Phys.Lett, 104, 212902 (2014).
[3] A. Grünebohm et al. Euro. Phys. Lett. 115, 47002 (2016).