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

Lu, X. Y.; Sun, J. R.; Wei, A. D.; Gao, W. W.; Shang, D. S.; Wang, J.; Wang, Z. H.; Shen, B. G.
July 2010
Applied Physics Letters;7/12/2010, Vol. 97 Issue 2, p022502
Academic Journal
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 ∼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 ∼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.


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