Substrate-induced strain effect in La_(0.875)Ba_(0.125)MnO_3 thin films grown on ferroelectric single-crystal substrates

摘要

The authors have studied the substrate-induced strain effect in La_(0.875)Ba_(0.125)MnO_3 (LBMO) thin films grown on ferroelectric 0.67Pb(Mg_(1/3)Nb_(2/3))O_3-0.33PbTiO_3 (PMN-PT) single-crystal substrates. Both the strain and resistance of the films can be in situ varied by applying an electric field across the PMN-PT substrates. X-ray diffraction analysis indicates that the variations of strain and resistance result from the induced strain in the PMN-PT substrate due to the ferroelectric polarization or the converse piezoelectric effect. The relationships between the resistance and the induced strain in the LBMO film and PMN-PT substrate have been quantitatively analyzed.