Effect of misfit strain on the electrocaloric effect in epitaxial SrTiO3 thin films
Department of Electronic Science and Engineering, Jiangsu Polytechnic University, Changzhou, 213164, P.R. China
2 Department of Physics, Suzhou University, Suzhou, 215006, P.R. China
Corresponding author: a email@example.com
Published online: 21 July 2009
Based on a phenomenological Landau-Devonshire theory, the effect of misfit strain on the electrocaloric effect in epitaxial SrTiO3 thin films is investigated. Theoretical analysis indicates that both the electrocaloric coefficient and the adiabatic temperature change strongly depend on the misfit strain. Moreover, the maximum of electrocaloric coefficient almost does not change with increasing the compressive or tensile misfit strain. However, the enhancement of misfit strain enlarges both the adiabatic temperature change and the temperature at which it is maximized. Most importantly, the largest room-temperature electrocaloric effect can be attained at a critical misfit strain. Therefore, it may open more opportunities for practical application in refrigeration devices.
PACS: 77.22.Ej – Polarization and depolarization / 77.70.+a – Pyroelectric and electrocaloric effects / 77.80.-e – Ferroelectricity and antiferroelectricity
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2009