Synthesis and Oxygen Content Dependent Properties of Hexagonal Manganites

ORAL

Abstract

Oxygen deficient samples of hexagonal (P6$_{3}$cm) DyMnO$_{3+\delta }(\delta $=-0.04) were synthesized in Ar by intentional decomposition of the perovskite phase obtained in air. Hexagonal samples annealed under oxidizing conditions exhibit unusually large excess oxygen content ($\delta <$0.4) and two new structural phases below 350\r{ }C. We will demonstrate how structural, resistive, magnetic, and thermal expansion properties are sensitively dependent $\delta $. Similar observations were made for other hexagonal manganites RMnO$_{3+\delta }$ indicating that their multiferroic properties can be controlled by the synthesis and annealing conditions.

*Work supported by NSF-DMR-0706610.

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Authors

  • B. Dabrowski

    • Department of Physics, Northern Illinois University, DeKalb, IL, Materials Science Division, Argonne National Laboratory, Argonne IL
    • Department of Physics, Northern Illinois University, DeKalb, IL 60115, USA

  • S. Remsen

    • Department of Physics, Northern Illinois University, DeKalb, IL 60115, USA

  • S. Kolesnik

    • Department of Physics, Northern Illinois University, DeKalb, IL
    • Northern Illinois University
    • Department of Physics, Northern Illinois University, DeKalb, IL 60115, USA

  • O. Chmaissem

    • Northern Illinois University
    • Department of Physics, Northern Illinois University, DeKalb, IL 60115, USA

  • J. Mais

    • Department of Physics, Northern Illinois University, DeKalb, IL 60115, USA