Sol-gel derived versus pulsed laser deposited epitaxial La0.67Ca0.33MnO3 films: structure, transport and effects of post-annealing
2004
Abstract Epitaxial La 0.67 Ca 0.33 MnO 3 films have been prepared on LaAlO 3 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 560 kA/m of 35% at 263 K (PLD) and 32% at 246 K (sol–gel).
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