Enhanced transport properties in LaxMnO3-&#948; thin films grown on SrTiO3 substrates

P. Orgiani; A. Galdi; C. Aruta; R. Ciancio; U. Lüders; R. V. K. Mangalam; W. Prellier; L. Maritato

doi:10.1117/12.845080

15 February 2010 Enhanced transport properties in La_xMnO_3-δ thin films grown on SrTiO₃ substrates

P. Orgiani, A. Galdi, C. Aruta, R. Ciancio, U. Lüders, R. V. K. Mangalam, W. Prellier, L. Maritato

Proceedings Volume 7603, Oxide-based Materials and Devices; 76030W (2010) https://doi.org/10.1117/12.845080
Event: SPIE OPTO, 2010, San Francisco, California, United States

Abstract

We report on structural, magnetic, and transport properties of La_xMnO_3-δ thin films, epitaxially grown on SrTiO₃ substrates by molecular beam epitaxy deposition technique. We varied the La/Mn ratio by changing the evaporation rate of the single-element diffusive cells. However, the oxygen content of La_xMnO_3-δ thin films was varied by post-annealing them in air and/or vacuum, by changing the annealing temperature and the time of post-annealing process. Optimal oxygenated La_0.88MnO_3-δ (LMO) films show extremely high metal insulator transitions temperature T_MI ~ 380K and magneto-transport similar to those found in strontium-doped La_1-xSr_xMnO₃ manganites compounds. Magnetic measurements confirm the formation of a ferromagnetic phase at Curie temperature T_c of about 360K. All these findings clearly demonstrate that the lanthanum deficiency, with respect to bivalent cation-substitution, is a very efficient way to hole-dope manganites.

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P. Orgiani, A. Galdi, C. Aruta, R. Ciancio, U. Lüders, R. V. K. Mangalam, W. Prellier, and L. Maritato "Enhanced transport properties in La_xMnO_3-δ thin films grown on SrTiO₃ substrates", Proc. SPIE 7603, Oxide-based Materials and Devices, 76030W (15 February 2010); https://doi.org/10.1117/12.845080

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