Effects of Strain in Highly Ordered Sr$_{2}$CrReO$_{6}$ Epitaxial Films

ORAL

Abstract

Sr$_{2}$CrReO$_{6}$, a double-perovskite ferrimagnet, has attracted much attention because of its Curie temperature well above room temperature and predictions of half-metallicity. We have deposited pure-phase Sr$_{2}$CrReO$_{6}$ epitaxial films on several (001)-oriented substrates and buffer layers by ultrahigh vacuum off-axis magnetron sputtering, in order to study tensile and compressive strain effects due to lattice mismatches up to 1.5{\%}. Triple-axis x-ray diffractometry was used in tandem with direct observations via HAADF STEM to confirm film epitaxy, phase purity, Cr/Re ordering, and strain via film lattice constants. Magnetic characterization shows a marked effect on the saturation magnetization due to strain, with slight changes in the Curie temperatures. Finally, electrical and optical characterization suggest that Sr$_{2}$CrReO$_{6 }$is a gapped material under both unstrained and strained systems, and will be discussed in detail as well.

*This work is supported by the Center for Emergent Materials at the Ohio State University, a NSF Materials Research Science and Engineering Center (DMR-0820414).

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Authors

  • A.J. Hauser

    • The Ohio State University

  • Jennifer Soliz

    • The Ohio State University
    • Department of Chemistry, Ohio State University

  • M. Dixit

    • The Ohio State University

  • R.E.A. Williams

    • The Ohio State University

  • M.A. Susner

    • The Ohio State University

  • B. Peters

    • The Ohio State University

  • L.M. Mier

    • The Ohio State University

  • T.L. Gustafson

    • The Ohio State University

  • Mike Sumption

    • The Ohio State University
    • Materials Science Dept, The Ohio State University

  • H.L. Fraser

    • The Ohio State University

  • Patrick Woodward

    • The Ohio State University
    • Ohio State University
    • Department of Chemistry, Ohio State University

  • F.Y. Yang

    • The Ohio State University