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Spontaneous atomic ordering and magnetism in epitaxially stabilized double-perovskites

Published online by Cambridge University Press:  18 May 2012

Akira Ohtomo ,
Suvankar Chakraverty ,
Hisanori Mashiko ,
Takayoshi Oshima  and
Masashi Kawasaki
Akira Ohtomo
Affiliation:
Department of Applied Chemistry, Tokyo Institute of Technology, Tokyo 152-8552, Japan. ALCA, Japan Science and Technology Agency (JST), Tokyo 102-0076, Japan.
Suvankar Chakraverty
Affiliation:
Correlated Electron Research Group (CERG) and Cross-Correlated Materials Research Group (CMRG), RIKEN Advanced Science Institute, Wako 351-0198, Japan.
Hisanori Mashiko
Affiliation:
Department of Applied Chemistry, Tokyo Institute of Technology, Tokyo 152-8552, Japan.
Takayoshi Oshima
Affiliation:
Department of Applied Chemistry, Tokyo Institute of Technology, Tokyo 152-8552, Japan.
Masashi Kawasaki
Affiliation:
Correlated Electron Research Group (CERG) and Cross-Correlated Materials Research Group (CMRG), RIKEN Advanced Science Institute, Wako 351-0198, Japan. Quantum-Phase Electronics Center and Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan. CREST, Japan Science and Technology Agency (JST), Tokyo 102-0075, Japan.
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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 ∼2μBper 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.

Keywords

oxidemagnetic propertieslaser ablation
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1454: Symposium HH – Nanocomposites, Nanostructures and Heterostructures of Correlated Oxide Systems , 2012 , pp. 3 - 13
Copyright
Copyright © Materials Research Society 2012

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