Effect of temperature on the La1-xCaxMnO3/SrTiO3:Nb (x=0-0.75) heterojunctions

Influence of temperature on the La1-xCaxMnO3/SrTiO3:Nb heterojunctions with the Ca content ranging from 0 to 0.75 has been experimentally studied. Obvious temperature effect occurs in the junction with a Ca content of 0.1. As experimentally shown, the interfacial barrier is insensitive to temperature below 340 K, and experiences a decrease from similar to 1.24 to 0.85 eV as temperature grows from 340 to 375 K. However, the temperature effect in other junctions is weak, and the energy barrier change is typically similar to 0.03-0.08 eV. In the scenario of temperature-driven orbital order-disorder transition in the La0.9Ca0.1MnO3 film, the temperature effect can be qualitatively understood. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3462322]