Influence of epitaxial strain on elastocaloric effect in ferroelectric thin films
Résumé
We report the influence of epitaxial strain um on the elastocaloric properties of BaTiO3 thin films.
Using thermodynamic calculations, we show that there exists a critical compressive stress r3c at
which the elastocaloric effect is maximized for any compressive misfit strain we investigate.
Moreover, it is found that jr3cj decreases significantly with decreasing jumj, which is accompanied
by a reduction of the elastocaloric response. Interestingly, a several fold enhancement in the
electrocaloric effect can be achieved for stress in proximity of r3c. The elastocaloric effect
predicted here may find potential cooling applications by combining the stress-mediated electrocaloric
effect or designing hybrid elastocaloric/electrocaloric devices in the future.
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