Electrical and Optical Properties of La0.7Ca0.3MnO3 Polycrystalline and Thin Film

F. Gao, University of Wollongong
R. A. Lewis, University of Wollongong
M. Ionescu, University of Wollongong
X. L. Wang, University of Wollongong
S. X. Dou, University of Wollongong

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This conference paper was originally published as Gao, F, Lewis, RA, Ionescu, M, Wang, XL & Dou, SX, Electrical and Optical Properties of La0.7Ca0.3MnO3 Polycrystalline and Thin Film, The 32nd Condensed Matter and Materials Meeting, Wagga Wagga, 30 January-1 February 2008. Original conference information available here

Abstract

The La_0.7Ca_0.3MnO₃ thin film shows a metal-insulator transition at temperature around 150 K, about 100 K lower than that of the polycrystalline sample. It is found that the activation barrier in the thin film is lower than that in the bulk sample. The FIR reflectance of the thin film exhibits a new mode which is not present in the bulk sample. We propose that the new mode is the corresponding surface bending mode.