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Enhanced transport properties in LaxMnO3-δ thin films epitaxially grown on SrTiO3 substrates: The profound impact of the oxygen content

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5 Author(s)
Orgiani, P. ; CNR-INFM Coherentia and Department of Mathematics and Informatics, University of Salerno, I-84081 Baronissi (SA), Italy ; Aruta, C. ; Ciancio, R. ; Galdi, A.
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We report on structural, magnetic, and transport properties of LaxMnO3-δ (LMO) thin films, epitaxially grown on SrTiO3 substrates by molecular beam epitaxy. Transport properties were investigated as a function of the La/Mn stoichiometry and the oxygen content. Optimal oxygenated LMO films (with stoichiometry ratio La/Mn=0.88) show a metal-insulator transitions temperature TMI∼387 K and magnetotransport similar to those found in strontium-doped La1-xSrxMnO3 manganites compounds. Also in presence of a La/Mn slight unbalance (namely, x=0.98), LMO films show a very high TMI∼370 K. However, LMO samples with La/Mn ratio larger than one, show severely depressed conducting properties, being insulating for x≫1.10. All these findings clearly demonstrate that the lanthanum deficiency is a very efficient way to dope manganites, as in the case of bivalent cation-substitution.

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Applied Physics Letters  (Volume:95 ,  Issue: 1 )