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artículo con referato
"Structural and transport properties of La0.67 Sr0.33Mn1-xSnxO3 thin films"
M.J. Villafuerte, S. Duhalde, M.C. Tezzoli, G. Polla, A.G. Leyva and L. Correra
Appl. Phys. A-Mater. 69(7) (1999) S565-S567
The magnetotransport properties of perovskite manganite films have attracted much recent interest because of the colossal magnetoresistance exhibited (CMR). The La1-xSrxMnO3 mixed valence compound contains Mn3+ with the configuration t2g3 eg1 and Mn4+ ions with a t2g3 structure. The doping with Sn could play a role regarding the structural and magnetotransport properties as the tin ions does not share the same interaction as the manganese ions. We report in this work the structural and transport characteristics of as-deposited and post-deposition annealed La0.67Sr0.33Mn1-xSnxO3 thin films by pulsed laser deposition (PLD). We analyzed the influence of the tin doping on films properties. X-ray diffraction (XRD), scanning electron microscopy (SEM) and R vs. T measurements were performed. We found that tin doping promotes oxygenation of the films, increasing the temperature of electrical transition Tρ, and could be an alternative to post-annealing treatments.
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