Abstract
We investigated structural, electrical and magnetic properties of epitaxial La0.67Sr0.33MnO3 (LSMO) thin films (20–100 nm thick) deposited by pulsed laser ablation on different substrates. Single crystalline substrates: (001) SrTiO3, (001) LaAlO3, (001) La0.26Sr0.76Al0.61Ta0.37O3 and (001) MgO were used to vary the substrate-induced epitaxial strain. The LSMO films exhibit very good crystal quality and enhanced temperatures of metal-insulator transition (TMI) as well as temperature of ferromagnetic ordering (Curie temperature, TC) up to 451 K with TMI = TC coincidence of both temperatures. The enhanced TC (TMI) values were analyzed with respect to substrate-induced strain and LSMO film thickness. We ascribe the increased TC (TMI) values to decreasing strength of electron-phonon coupling coming from Jahn-Teller splitting. The substrate-induced strain in the LSMO films only decreased the TC (TMI) values depending on magnitude of biaxial strain.
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