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Comparison of Sol-Gel Derived and Pulsed Laser Deposited Epitaxial La0.67Ca0.33MnO3 Films for IR Bolometer

Published online by Cambridge University Press:  17 March 2011

Rickard Fors ,
Annika Pohl ,
Sergey Khartsev ,
Alexander Grishin  and
Gunnar Westin
Rickard Fors
Affiliation:
Department of Condensed Matter Physics, Royal Institute of Technology, SE-164 40 Stockholm-Kista, Sweden
Annika Pohl
Affiliation:
Department of Material Chemistry, Ångström Laboratory, Uppsala University, SE-751 21 Uppsala, Sweden
Sergey Khartsev
Affiliation:
Department of Condensed Matter Physics, Royal Institute of Technology, SE-164 40 Stockholm-Kista, Sweden
Alexander Grishin
Affiliation:
Department of Condensed Matter Physics, Royal Institute of Technology, SE-164 40 Stockholm-Kista, Sweden
Gunnar Westin
Affiliation:
Department of Material Chemistry, Ångström Laboratory, Uppsala University, SE-751 21 Uppsala, Sweden
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Abstract

Epitaxial La0.67Ca0.33MnO3 films have been prepared on LaAlO3 crystals by pulsed laser deposition (PLD) and by a novel all-alkoxide sol-gel technique. Different out-of-plane lattice parameters are found for the as-prepared films, and scanning electron microscopy shows a more porous structure for sol-gel films as compared to PLD films. These differences are largely removed by post-annealing at 1000 °C. Transport measurements show maximum temperature coefficient of resistivity of 8.2 % K−1 at 258 K (PLD) and 6.1 % K−1 at 241 K (sol-gel) and colossal magnetoresistance at 7 kOe of 35 % at 263 K (PLD) and 32 % at 246 K (sol-gel).

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