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

      Saptarshi Ghosh Avinash Singh

      Research Articles Volume 70 Issue 1 January 2008 pp 163-171

    • Fulltext

       

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      Permanent link:
      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

       
      Published
      January 2008
      Manuscript received
      11 September 2006
      Manuscript revised
      24 May 2007
      Accepted
      28 August 2007

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