Effect of substrate-induced strain on transport and magnetic properties of epitaxial La0.66Sr0.33MnO3 thin films
Abstract
We have studied electrical transport and magnetic properties of epitaxial La0.66 Sr0.33 Mn O3 thin films grown on different substrates having different lattice strains induced by different film-substrate lattice-mismatch. Both electrical transport and magnetic properties exhibit strong correlation with Jahn-Teller strain. Our study shows a sufficiently large Jahn-Teller strain giving rise to distinct semi-conducting/insulating state in LSMO thin films even below the respective para-ferromagnetic Curie temperatutes Tc, which is in contradiction with the established phase diagram of Sr-doped manganites. We have presented a microscopic model for the analysis of our data instead of the usual expansion around the undistorted state generally in use in the literature. The model incorporates the two relevant eg orbitals (and their ordering thereof) and the effect of both Jahn-Teller and bulk strain on the transition temperature via double exchange.
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