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Properties of interfaces between SrTiO3 thin films and electrodes

Abstract SrTiO3 films with thickness ranging from 25nn to 2.5μm were grown on LaAlO3 substrates with SrRuO3 electrode layers. Measurements of the dielectric properties were performed over a range of temperatures The dielectric loss depends strongly on the thickness, but differently above and below T ∼ 80 K. Our result suggests that, in the high temperature regime, the interfacial dead layer effect dommates while, in the low temperature regime, the losses related to the structural phase transition and quantum fluctuations are important. The contribution to the interfacial potential from Schottky barriers was investigated for different electrode materials. Preliminary results of this study suggest that the continued dielectric nonlinearity of the thin films at high temperatures (above T ∼ 80 K) complicates the analysis of the Schottky barrier height measurements.