Physics
Scientific paper
Jun 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jphd...36.1361s&link_type=abstract
Journal of Physics D: Applied Physics, Volume 36, Issue 12, pp. 1361-1365 (2003).
Physics
6
Scientific paper
Polycrystalline films of La0.7Ca0.2Ba0.1MnO3 (LCBMO) were deposited on LaAlO3, SrTiO3 (STO), Al2O3 and YSZ single crystal substrates by spray pyrolysis technique employing an ultrasonic nebulizer. Deposition and annealing conditions for all four films were kept identical. All films have been found to be single phase and have orthorhombic unit cells with only slightly different lattice parameters. The magneto-transport properties (magnetoresistance (MR), TC and TIM) of these polycrystalline LCBMO films are found to depend strongly on the substrate. The lattice mismatch between the film and substrate induces strain of various degrees. The strain is believed to get relaxed and accommodated. This produces disorders dominantly through the increase in the grain boundary density and hence decrease in grain size. The largest strain leads to the creation of highest degree of disorder. The observed MR for the case of YSZ/LCBMO is found to be significantly higher than other case of STO/LCBMO. As for example, for YSZ/LCBMO where the lattice mismatch is -24.280%, MR is ~7%, on the other hand for STO/LCBMO where the lattice mismatch is -0.333%, MR is ~2.3%. The TC and TIM for the film with higher disorder (YSZ/LCBMO) is significantly reduced as compared to the case of the film having lower disorder (STO/LCBMO). The TC for YSZ/LCBMO (higher disorder) is 243 K and for STO/LCBMO (lower disorder), it is 285 K.
Khare Neelu
Singh Ambuj K.
Singh Hemant Kumar
Singh Patan D.
Siwach P. K.
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