NANO-ORDERED PALPUS-LIKE CRYSTALS INLa1/3Ca2/3MnO3FILMS

J. H. Xing, B. Qian, J. F. Feng, X. F. Jiang, X. S. Wu (), Y. M. Zhang, Q. Ji and J. Gao
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J. H. Xing: Lab of Solid State Microstructures, Department of Physics, Nanjing University, Nangjing 210093, China;
B. Qian: Lab of Solid State Microstructures, Department of Physics, Nanjing University, Nangjing 210093, China;
J. F. Feng: Lab of Solid State Microstructures, Department of Physics, Nanjing University, Nangjing 210093, China;
X. F. Jiang: Lab of Solid State Microstructures, Department of Physics, Nanjing University, Nangjing 210093, China;
X. S. Wu: Lab of Solid State Microstructures, Department of Physics, Nanjing University, Nangjing 210093, China;
Y. M. Zhang: Lab of Solid State Microstructures, Department of Physics, Nanjing University, Nangjing 210093, China
Q. Ji: Lab of Solid State Microstructures, Department of Physics, Nanjing University, Nangjing 210093, China
J. Gao: Department of Physics, The University of Hong Kong, Pokflam Road, Hong Kong, China

Surface Review and Letters (SRL), 2007, vol. 14, issue 04, 769-772

Abstract: The surface ofLa1/3Ca2/3MnO3(LCMO) films with thickness,t, ranging from 4 to 150 nm has been studied. Highly ordered palpus-like crystals induced by strain are observed in the films grown on the substrate ofSrTiO3(with thicknesstranging from 20 to 50 nm) and on sapphire (with thicknesstranging from 30 to 50 nm). The strain is identified to result from thermal expansion mismatch between the substrate and the film, and thermal expansion anomaly may exist at a high temperature induced by possible phase transition in LCMO witht= 30 nm. Such a phenomenon may arrest the film growth and the understanding of colossal magnetoresistance materials as well as provide a new way to make ordered structures for applications.

Date: 2007
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DOI: 10.1142/S0218625X07010238

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