Electrical and Magnetic Properties of Layered CaMn<sub>2</sub>Bi<sub>2</sub>

ORAL

Abstract

CaMn2Bi2 forms a hexagonal structure, consisting of alternately stacked Ca and Mn2Bi2 layers. Instead of ferromagnetic ordering seen in MnBi, CaMn2Bi2 orders antiferromagnetically below TN ~ 150 K, as reflected in the magnetization, specific heat, and electrical resistivity. Although it is considered as a narrow-gap semiconductor, our resistivity shows metallic behavior with a sharp drop at TN and a little bump at Tb ~ 20 K. Below Tb, large positive magnetoresistance with non-monotonic field dependence is observed in all current and magnetic field configurations. Its possible origin will be discussed.

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Presenters

  • Joanna Blawat

    • Physics and Astronomy, Louisiana State University

Authors

  • Joanna Blawat

    • Physics and Astronomy, Louisiana State University

  • Xin Gui

    • Chemistry, Louisiana State University
    • Louisiana State University
    • Department of Chemistry, Louisiana State University
    • Chemistry, Louisiana State Univeristy

  • Roshan Nepal

    • Louisiana State University
    • Physics and Astronomy, Louisiana State University

  • Ramakanta Chapai

    • Louisiana State University
    • Physics and Astronomy, Louisiana State University

  • Robert Cava

    • Department of Chemistry, Princeton University
    • Princeton University
    • Chemistry, Princeton U.
    • Chemistry, Princeton University

  • Weiwei Xie

    • Chemistry, Louisiana State University
    • Louisiana State University
    • Department of Chemistry, Louisiana State University
    • Chemistry, Louisiana State Univeristy

  • Rongying Jin

    • Louisiana State University
    • Physics, Louisiana State University
    • Physics and astronomy, Louisiana State University
    • 2Condensed Matter Physics and Materials Science Departement, Brookhaven National Laboratory
    • Department of Physics and Astronomy, Louisiana State University
    • Physics and Astronomy, Louisiana State University