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Epitaxial growth of La0.7Ba0.3MnO3 thin films on MgO substrates: Structural, magnetic, and transport properties

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12 Author(s)
Orgiani, P. ; CNR-INFM Coherentia and Dipartimento di Fisica, University of Salerno, I-84081 Baronissi (SA), Italy ; Adamo, C. ; Barone, C. ; Galdi, A.
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We report on structural, magnetic, and transport properties of La0.7Ba0.3MnO3 thin films, epitaxially grown on MgO substrates. Despite the quite similar structural features if compared to crystalline manganite films, our samples show a metal-insulator transition temperature of about 200 K, sizeably lower than the bulk-value (TMI≃345 K). Moreover, the magnetotransport properties show the absence of saturation in the magnetoresistance and localization phenomena at low temperatures (T≪30 K). The temperature behavior of the magnetization shows a Curie temperature Tc value above room temperature, ruling out effects due to oxygen deficiency. All these findings are analyzed in terms of possible physical mechanisms related to the growth in the presence of large mismatch between film and substrate lattice parameters.

Published in:

Journal of Applied Physics  (Volume:103 ,  Issue: 9 )

Date of Publication:

May 2008

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