Electrical and Magnetic Properties of Layered CaMn2Bi2

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.

–

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