Engineering the magnetocaloric properties of PrVO 3 epitaxial oxide thin films by strain effects
Résumé
Combining multiple degrees of freedom in strongly correlated materials such as transition-metal oxides would lead to fascinating magneticand magnetocaloric features. Herein, the strain effects are used to markedly tailor the magnetic and magnetocaloric properties of PrVO3thinfilms. The selection of an appropriate thickness and substrate enables us to dramatically decrease the coercive magnetic field from 2.4 T pre-viously observed in sintered PVO3bulk to 0.05 T for compressive thin films making from the PrVO3compound a nearly soft magnet. This isassociated with a marked enhancement of the magnetic moment and the magnetocaloric effect that reaches unusual maximum values ofroughly 4.86lBand 56.8 J/kg K with the magnetic field change of 6 T applied in the sample plane in the cryogenic temperature range (3 K),respectively. This work strongly suggests that taking advantage of different degrees of freedom and the exploitation of multiple instabilities ina nanoscale regime is a promising strategy for unveiling unexpected phases accompanied by a large magnetocaloric effect in oxides.
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