Competing Magnetic Ground States in A{\-}Site Layer Ordered Manganites

ORAL

Abstract

We report the discovery of competing ground states near a multicritical point in A-site layer ordered La$_{1-x}$Ba$_{1+x}$Mn$_{2}$O$_{6}$ materials. We demonstrate the dual effects of deliberately introduced disorder on the system's stability, the freezing of the competing states, and the drastic reduction in magnetic fields required for the suppression of charge and orbital ordered phases. Our work suggests that quenched disorder is not the primary reason for phase separation and magnetoresistance, and that increased doping leads to electronic phase separation.

*Work at NIU was supported by the NSF (DMR-0706610) and at ANL by the U.S. DOE under contract No. DE-AC02-06CH11357.

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Authors

  • B. Dabrowski

    • MSD, Argonne National Laboratory, and Physics, Northern Illinois University, De Kalb IL, USA
    • Physics Department, Northern Illinois University, DeKalb, IL 60115
    • Physics Department, Northern Illinois University, DeKalb, IL 60115 and Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
    • Department of Physics, Northern Illinois University, DeKalb, IL and Materials Science Division, Argonne National Laboratory, Argonne, IL
    • Northern Illinois University
    • Physics Department, Northern Illinois University, DeKalb IL 60115
    • Department of Physics, Northern Illinois University, DeKalb, IL 60115

  • O. Chmaissem

    • MSD, Argonne National Laboratory, and Physics, Northern Illinois University, De Kalb IL, USA
    • Physics Department, Northern Illinois University, DeKalb, IL 60115
    • Physics Department, Northern Illinois University, DeKalb, IL 60115 and Materials Science Division, Argonne National Laboratory, Argonne, IL 60439
    • Department of Physics, Northern Illinois University, DeKalb, IL and Materials Science Division, Argonne National Laboratory, Argonne, IL
    • Department of Physics, Northern Illinois University, DeKalb, IL 60115

  • Y. Ren

    • APS, Argonne National Lab
    • Physics Department, Northern Illinois University, DeKalb, IL 60115 and X-ray Science Division, Argonne National Laboratory, Argonne, IL 60439

  • D. E. Brown

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

  • S. Kolesnik

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

  • J. Mais

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