Tuning the magnetic properties of NiBr2 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.

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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