Conductivity of Manganite Films under the Action of Tension Caused by the Deformation of Substrate

Resumo

The electron transport properties of strained thin La_0.7Ba_0.3MnO₃ (LBMO) epitaxial films are studied. Films 40–100 nm in thickness were prepared by laser ablation at a temperature T = 700–800°C in pure oxygen atmosphere of 0.3–1 mBar. Ferroelectric crystal substrates (011)0.79PbMg_1/3Nb_2/3O₃–0.21-PbTiO₃ (PMN–PT) with a Curie temperature of 150°C and high piezoelectric constants were used to create a mechanical stress. The ferroelectric polarization and piezoelectric effects on the electrical parameters of LBMO films are studied.