Thickness-dependent optical properties of La 0.7 Sr 0.3 Mn O3 thin films

H. L. Liu, M. X. Kuo, J. L. Her, K. S. Lu, S. M. Weng, L. M. Wang, S. L. Cheng, J. G. Lin

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We report on a systematic study of the thickness dependence of the optical properties of La0.7 Sr0.3 Mn O3 thin films epitaxially grown on a LaAl O3 substrate. The x-ray powder-diffraction data indicate that the c -axis lattice constant is enhanced with decreasing the film thickness due to the compressive strain in the film plane produced by lattice mismatch. Magnetization curves show a decrease of the Curie temperature (TC) for decreasing thickness of films. Optical reflectance and transmittance measurements provide evidence that the position of Mn-O stretching mode shifts toward low frequency and the energy of the charge-transfer transition between O 2p and Mn 3d states increases with the decrease of film thickness. Most importantly, an analysis of the small-polaron absorption in the mid-infrared region shows that the polaron binding energy increases with decreasing the film thickness, suggesting that the strain dependence of TC mainly results from the strain-induced electron-phonon coupling.

Original languageEnglish
Article number113528
JournalJournal of Applied Physics
Issue number11
StatePublished - 2005


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