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Spontaneous atomic ordering and magnetism in epitaxially stabilized double perovskites

Published online by Cambridge University Press:  23 January 2013

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; Tokodai Institute of Element Strategy (TIES) and Materials Research Center for Element Strategy (MCES), Tokyo Institute of Technology, Yokohama 226-8503, Japan; and 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; and Quantum-Phase Electronics Center and Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

We have studied the atomic ordering of B-site transition metals and magnetic properties in the pulsed laser deposited films of La2CrFeO6 (LCFO) and La2VMnO6 (LVMO), whose bulk materials are known to be single perovskites with random distribution of the B-site cations. 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 ∼2 μB per formula unit, unlike those predicted theoretically. In addition, they were found to be insulating with optical band gaps of 1.6 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.

Type
Invited Feature Review
Information
Journal of Materials Research , Volume 28 , Issue 5 , 14 March 2013 , pp. 689 - 695
Copyright
Copyright © Materials Research Society 2013

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Footnotes

This paper has been selected as an Invited Feature Paper.

References

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