Metamagnetic phase transitions in the orthorhombic antiferromagnetic topological semimetal CuMnAs

ORAL

Abstract

Anisotropic magnetic materials are known to exhibit field-induced spin-flip or spin-flop phase transitions if the external field is applied along the easy axis. Recently, orthorhombic CuMnAs was proposed to be a promising candidate in antiferromagnetic spintronics. It is thus interesting to study how spins interact with external magnetic fields. Our previous study has shown that the magnetism in orthorhombic CuMnAs is very sensitive to the Cu vacancies and Cu/Mn site mixing. While Cu0.95MnAs shows a single paramagnetic to commensurate antiferromagnetic phase transition at 360 K, Cu0.98Mn0.96As shows a paramagnetic to incommensurate antiferromagnetic phase transition at 320 K followed by an incommensurate to commensurate antiferromagnetic phase transition at 230 K. In this talk we will present our findings on the anisotropic magnetic properties for fields up to 7 T of the single crystalline orthorhombic topological semimetal Cu0.95MnAs and Cu0.98Mn0.96As, which again are very sensitive to the stoichiometry of the material.

*Work at UCLA was supported by DOE award DE-SC0011978. Work at ORNL was supported by DOE.

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Presenters

  • Eve Emmanouilidou

    • Physics, University of California at Los Angeles
    • Department of Physics and Astronomy , Univ of California - Los Angeles
    • Physics and Astronomy, Univ of California - Los Angeles

Authors

  • Eve Emmanouilidou

    • Physics, University of California at Los Angeles
    • Department of Physics and Astronomy , Univ of California - Los Angeles
    • Physics and Astronomy, Univ of California - Los Angeles

  • Huibo Cao

    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory
    • Quantum Condensed Matter Division, Oak Ridge National Laboratory
    • Neutron Sciences Directorate, Oak Ridge National Laboratory
    • Neutron Scattering Division, Oak Ridge National Lab
    • Oak Ridge National Lab
    • Oak Ridge Natl Lab
    • Quantum Condensed Matter Division , Oak Ridge National Laboratory

  • Ni Ni

    • Physics, University of California at Los Angeles
    • Physics and Astronomy, Univ of California - Los Angeles
    • Department of Physics and Astronomy and California NanoSystems Institute, University of California, Los Angeles
    • Department of Physics and Astronomy , Univ of California - Los Angeles