Abstract
Precisely (100)-oriented, 200-nm thick La0.67Ca0.33MnO3 films have been grown by laser ablation on a sapphire (R-plane) substrate covered by a (100)SrTiO3/(001)Bi2SrNb2O9/(001)CeO2 trilayer buffer. The azimuthal misorientation of crystal grains (50–300 nm) in the La0.67Ca0.33MnO3 films decreased by about 40% as the condensation temperature was increased ered from 760 to 810° C. The lattice parameter of the grown manganate films was reduced to 3.81–3.82 Å by enriching them with oxygen. The maximum in the temperature dependence of the electrical resistivity of the La0.67Ca0.33MnO3 films grown was shifted toward lower temperatures by 20–50 K relative to its position for bulk ceramic samples of a stoichiometric composition. The largest magnetoresistance (MR=42% at H=0.4 T) was found in La0.67Ca0.33MnO3 films with a Mn4+ concentration on the order of 50% (T=166 K).
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Translated from Fizika Tverdogo Tela, Vol. 42, No. 11, 2000, pp. 2042–2047.
Original Russian Text Copyright © 2000 by Bo\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \)kov, Erts, Claeson.
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Boikov, Y.A., Erts, D. & Claeson, T. Transport parameters of granular La0.67Ca0.33MnO3 films grown on an R-plane sapphire. Phys. Solid State 42, 2103–2108 (2000). https://doi.org/10.1134/1.1324047
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DOI: https://doi.org/10.1134/1.1324047