Strain modification of epitaxial perovskite oxide thin films using structural transitions of ferroelectric BaTiO3 substrate

Effects of induced biaxial strain on the electrical transport and magnetic properties of epitaxialthin films of SrRuO 3 and La 0.67 Sr 0.33 MnO 3 by structural transitions of ferroelectric BaTiO 3 substrates have been studied. Large jumps of electrical resistivity (∼5% in SrRuO 3 and ∼12% in La 0.67 Sr 0.33 MnO 3 ) and low field magnetization (∼70% in La 0.67 Sr 0.33 MnO 3 ) have been observed in the films at the structural transition temperatures of BaTiO 3 substrate. The hysteretic jumps are reproducible through many thermal cycles, and they can be attributed to strain effects induced by the substrate. The use of phase transitions of ferroelectric substrates to manipulate lattice strain of epitaxialthin film heterostructures can be a useful way to modify the properties of perovskite oxides