Tuning the magnetic properties of NiBr<sub>2</sub> with cobalt doping

ORAL

Abstract

The compound NiBr2 crystallizes in the trigonal space group R-3m. Below TN= 44 K, NiBr2 exhibits antiferromagnetic order characterized by antiferromagnetically stacked sheets of ferromagnetically aligned Ni spins. A transition to a helical magnetic structure occurs below TIC=22.8 K with a propagation vector of at 4.2 K. Here we use neutron diffraction to study the tuning of the magnetic properties with cobalt substitution in single crystals for several compositions of Ni1-xCoxBr2, where x = 0, 0.2, 0.25, 0.3, and 0.45. Our measurements show that the TN decreases with doping while changes in TIC are more subtle. The neutron scattering studies further reveal that the 6 incommensurate spots in the parent compound give way to a ring of magnetic scattering reminiscent of that observed previously for Ni0.92Zn0.08Br2.

*This work was supported by U.S. DOE, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division and the Gordon and Betty Moore Foundation’s EPiQS Initiative.

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Presenters

  • Hasitha Suriya Arachchige

    • Department of Physics & Astronomy, University of Tennessee, Knoxville, TN 37996, USA
    • Department of Physics and Astronomy, University of Tennessee
    • Materials Science and Engineering, University of Tennessee
    • Department of Physics & Astronomy, The University of Tennessee

Authors

  • Hasitha Suriya Arachchige

    • Department of Physics & Astronomy, University of Tennessee, Knoxville, TN 37996, USA
    • Department of Physics and Astronomy, University of Tennessee
    • Materials Science and Engineering, University of Tennessee
    • Department of Physics & Astronomy, The University of Tennessee

  • Binod Rai

    • Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
    • Oak Ridge National Laboratory
    • Materials Science and Technology Division, Oak Ridge National Lab

  • Ganesh Pokharel

    • Department of Physics & Astronomy, University of Tennessee, Knoxville, TN 37996, USA
    • Department of Materials Science and Engineering, University of Tennessee Knoxville
    • Materials Science and Engineering, University of Tennessee
    • Department of Physics & Astronomy, The University of Tennessee

  • Andrew May

    • Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
    • Oak Ridge National Laboratory
    • Materials Science and Technology Division, Oak-Ridge National Laboratory
    • Materials Science and Technology Division, Oak Ridge National Lab
    • Materials Science and Technology Division, Oak Ridge National Laboratory

  • Adam Aczel

    • Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
    • Oak Ridge National Laboratory
    • Oak Ridge Nat. Lab.

  • Travis J Williams

    • Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
    • Oak Ridge National Laboratory

  • Matthias D Frontzek

    • Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
    • Neutron Scattering Division, Oak Ridge National Laboratory

  • Cristian Batista

    • Department of Physics & Astronomy, University of Tennessee, Knoxville, TN 37996, USA
    • Department of Physics and Astronomy, The University of Tennessee
    • University of Tennessee
    • Department of Physics and Astronomy, University of Tennessee
    • Department of Physics, University of Tennessee

  • David George Mandrus

    • Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
    • University of Tennessee-Knoxville
    • Oak Ridge National Lab
    • Department of Materials Science and Engineering, University of Tennessee
    • University of Tennessee (Knoxville, USA)
    • Department of Materials Science and Engineering, University of Tennessee Knoxville
    • Department of Material Science & Engineering, University of Tennessee
    • Material Science and Engineering, University of Tennessee
    • Materials Science and Technology, Materials Science and Technology
    • University of Tennessee, Knoxville
    • Department of Materials Science and Engineering, The University of Tennessee
    • Materials Science and Engineering, The University of Tennessee
    • Oak Ridge National Laboratory
    • Department of Material Science and Engineering, University of Tennessee

  • Andrew D Christianson

    • Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Materials Science and Technology Division, Oak-Ridge National Laboratory
    • Materials Science and Technology Division, Oak Ridge National Lab
    • Oak Ridge National Laboratory