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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


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
Publication statusPublished - 2005

ASJC Scopus subject areas

  • General Physics and Astronomy


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