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Mixed‐Valence Perovskite Thin Films by Polymer‐Assisted Deposition
Author(s) -
Jain Menka,
Bauer Eve,
Ronning Filip,
Hundley Michael F.,
Civale Leonardo,
Wang Haiyan,
Maiorov Boris,
Burrell Anthony K.,
McClesky Thomas M.,
Foltyn Stephen R.,
DePaula Raymond F.,
Jia Quanxi
Publication year - 2008
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2008.02396.x
Subject(s) - manganite , magnetoresistance , thin film , materials science , colossal magnetoresistance , valence (chemistry) , perovskite (structure) , curie temperature , analytical chemistry (journal) , chemical engineering , nanotechnology , crystallography , chemistry , ferromagnetism , condensed matter physics , magnetic field , physics , organic chemistry , chromatography , quantum mechanics , engineering
In thin films of rare‐earth manganites, RE 1− x M x MnO 3 (RE=rare earth, M=Ca, Sr, Ba), with mixed‐valence perovskite structure, the transport properties highly depend on the deposition technique, processing conditions, and the substrate used. Chemical solution deposition techniques provide many advantages, such as low cost, easy setup, and coating of large areas. However, the crystalline quality, uniformity, and reproducibility of the film depend on the reactivity of the chemical used for solution preparation. In this paper, we report a novel process to grow rare‐earth manganite films using low‐cost polymer‐assisted deposition technique. In this process, polymer controls the viscosity and binds metal ions, resulting in a homogeneous distribution of metal precursors in the solution and a uniform film. These solutions were stable, and crack‐free films were obtained using these solutions. In this paper, thin films of La 1− x Sr x MnO 3 , La 1− x Ca x MnO 3 , and Pr 0.5 Ca 0.5 MnO 3 were grown on (001) LaAlO 3 substrates. The La 1− x Sr x MnO 3 and La 1− x Ca x MnO 3 films were highly c ‐axis oriented and epitaxial, and showed high magnetoresistance near their Curie temperature. Charge ordering was observed in the Pr 0.5 Ca 0.5 MnO 3 film at 220 K and high magnetoresistance of nearly −100% was obtained at low temperatures. The structural, transport, and magnetic properties of these films were similar to those obtained for films grown by physical vapor deposition.