• Anisotropic Hubbard model on a triangular lattice - spin dynamics in HoMnO3

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      https://www.ias.ac.in/article/fulltext/pram/070/01/0163-0171

    • Keywords

       

      Spin dynamics; neutron scattering; triangular lattice; multiferroics.

    • Abstract

       

      The recent neutron scattering data for spin-wave dispersion in HoMnO3 are well-described by an anisotropic Hubbard model on a triangular lattice with a planar (XY) spin anisotropy. Best fit indicates that magnetic excitations in HoMnO3 correspond to the strong-coupling limit $U/t > \sim 15$, with planar exchange energy $J = 4t^{2}/U \simeq 2.5$ meV and planar anisotropy $\Delta U \simeq 0.35 $meV.

    • Author Affiliations

       

      Saptarshi Ghosh1 Avinash Singh1

      1. Department of Physics, Indian Institute of Technology, Kanpur 208 016, India
    • Dates

       
  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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