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Thin films; Crystal growth; X-ray diffraction; Electronic transport
Abstract:
La(0.67)Ca(0.33)MnO(3) thin films have been grown on 10 degrees, 15 degrees, and 20 degrees vicinal cut SrTiO(3) (100) substrates by pulse laser deposition. The single phase and the least textured growth have been studied by X-ray diffraction analysis. The post annealing effect with high temperature and high oxygen pressure on the transport properties of films has been investigated by resistance versus temperature measurements. Films with post annealing show large enhancement of metal-insulator transition temperature T(p) about 20-30 K towards higher temperature and obvious decrease of resistance, which is attributed to the refilling of oxygen, the change of Mn-O-Mn angle and the improvement of crystallinity by the post annealing effect. Specially, film on 20 degrees vicinal cut substrate exhibits the biggest range gap of peak resistance drop, which may originate from more defects caused by steps at this tilt angle and many of these defects are removed after post annealing. (C) 2011 Elsevier B. V. All rights reserved.
