Magnetism in the honeycomb layers of Na<sub>2</sub>Ni<sub>2</sub>TeO<sub>6</sub> with chiral layers of Na

POSTER

Abstract

Low dimensional magnetic lattices offer the possibility of realizing flatbands in the magnon spectrum which can then lead to dissipation-less spin transport and associated magnon Hall effect. One could expect to find a magnon insulator, similar to a topological insulator. In the present work we present a rather less-studied honeycomb material Na2Ni2TeO6 where our preliminary density functional theory calculations of magnetic structure shows departures from reported structures. Our samples of Na2Ni2TeO6 confirmed hexagonal P63/mcm space group with refined lattice parameters, a=5.2023(1)Å and c=11.1552(8)Å. The bulk magnetism for the present sample is characterized using magnetic susceptibility and specific heat, both of which confirm a phase transition at 28 K. Application of 8 T magnetic field only slightly polarizes the transition. We obtain a Curie-Weiss temperature of -9.7(2)K and effective paramagnetic moment of 2.24(4)mB/Ni. This matches well with the spin-only moment of Ni2+. Elastic and inelastic neutron scattering experiments are currently underway and reveal a rather flat spin wave excitation at 5 meV. Combining neutron diffraction with the DFT results, we would arrive at an accurate estimation of the exchange constants for Na2Ni2TeO6.

*The Univserty of Texas at El Paso

Presenters

  • Nathan Episcopo

    • University of Texas, El Paso

Authors

  • Nathan Episcopo

    • University of Texas, El Paso

  • Kinley Wangmo

    • University of Texas, El Paso

  • Narayan Poudel

    • Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX 77204, USA
    • Texas Center for Superconductivity, University of Houston
    • Idaho National Laboratory

  • Krzysztof Gofryk

    • Idaho national lab
    • Idaho National Laboratory

  • Po-Hao Chang

    • University of Texas, El Paso
    • Physics, University of Texas at El Paso
    • George Mason University

  • Rajendra Zope

    • University of Texas, El Paso
    • Physics, University of Texas at El Paso
    • Physics, University of Texas, El Paso
    • University of Texas at El Paso

  • Ryan Klein

    • National Renewable Energy Laboratory

  • Craig Brown

    • Center of Neutron Research, National Institute of Standards and Technology
    • NIST Center for Neutron Research
    • NIST Center for Neutron Research, NIST
    • Center for Neutron Research, National Institute of Standards and Technology
    • National Institute of Standards and Technology
    • NCNR, NIST

  • Thomas Heitmann

    • University of Missouri Research Reactor
    • MU Research Reactor, Univ of Missouri - Columbia, MO 65211 USA
    • Missouri Research Reactor, University of Missouri
    • University of Missouri
    • MURR
    • The Missouri Research Reactor, University of Missouri - Columbia
    • The Missouri Research Reactor, University of Missouri Columbia
    • Research Reactor-MURR; Physics & Astronomy, Univ of Missouri, Columbia
    • Univ of Missouri - Columbia

  • Harikrishnan S Nair

    • Colorado State University
    • Department of Physics, University of Texas at El Paso, El Paso, TX 79968 USA
    • University of Texas, El Paso
    • University of Texas El Paso