Abstract
Thin films of La 0.67Ca 0.33MnO 3 (LCMO) ( d=15–200 nm) were grown epitaxially at 750°C under oxygen pressure of 20–25 Pa on lattice-matched NdGaO 3 (1 0 0), LaAlO 3 (1 0 0), SrTiO 3 (1 0 0) and SrTiO 3 (1 1 0) using pulsed laser deposition. Highly oriented LCMO (1 0 0) films have been additionally prepared on MgO (1 0 0) substrate. Asymmetric (grazing incidence) X-ray diffraction revealed various strain states appearing in a film plane under biaxial compressive stress (LaAlO 3) and tensile stress (SrTiO 3 (1 0 0) and SrTiO 3 (1 1 0)). Existence of nonuniform strains was found for the films grown on MgO crystal exhibiting the largest lattice mismatch. The paramagnetic to ferromagnetic transition temperature, T p, found from resistivity measurements increased with film thickness. Measurements of optical transmission and reflectance revealed a strain-dependent absorption band at 1.2–1.4 eV. The slightly higher T p values indicated for the LCMO (1 1 0)/STO (1 1 0) films compared to those of similar LCMO (1 0 0)/STO (1 0 0) layers have been explained taking into account different textures related to a slightly distorted (orthorhombic) LCMO crystal when grown epitaxially on different planes of cubic SrTiO 3.
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