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Title
Japanese: 
English:Spontaneous atomic ordering and magnetism in epitaxially stabilized double-perovskites 
Author
Japanese: 大友 明, S. Chakraverty, 増子 尚徳, 大島 孝仁, 川﨑 雅司.  
English: A. Ohtomo, S. Chakraverty, H. Mashiko, T. Oshima, M. Kawasaki.  
Language English 
Journal/Book name
Japanese: 
English:MRS Proceedings 
Volume, Number, Page Volume 1454        pp. 3-13
Published date May 18, 2012 
Publisher
Japanese: 
English:Cambridge University Press 
Conference name
Japanese: 
English:2012 Materials Research Society Spring Meeting 
Conference site
Japanese:カリフォルニア州サンフランンシスコ 
English:San Francisco, California 
Official URL http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=8588731
 
DOI https://doi.org/10.1557/opl.2012.923
Abstract We report on the atomic ordering of B-site transition-metals and magnetic properties in double-perovskite oxides, La2CrFeO6 (LCFO) and La2VMnO6 (LVMO), which have never been reported to exist in ordered forms. These double-perovskite oxides are particularly interesting because of possible ferromagnetism (expected from the Kanamori-Goodenough rule for LCFO) and half-metallic antiferromagnetism (predicted for LVMO). Using pulsed-laser deposition technique with single solid-solution targets, we have prepared epitaxial films in ordered forms. Despite similar ionic characters of constituent transition-metals in each compound, the maximum B-site order attained was surprisingly high, ∼90% for LCFO and ∼80% for LVMO, suggesting a significant role of epitaxial stabilization in the spontaneous ordering process. Magnetization and valence state characterizations revealed that the magnetic ground state of both compounds was coincidently ferrimagnetic with saturation magnetization of ∼2μ Bper formula unit, unlike those predicted theoretically. In addition, they were found to be insulating with optical band-gaps of 1.6 eV and 0.9 eV for LCFO and LVMO, respectively. Our results present a wide opportunity to explore novel magnetic properties of binary transition-metal perovskites upon epitaxial stabilization of the ordered phase.

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