Magnetic structure and spin waves in the Kagomé jarosite compound KFe3(SO4)2(OH)6

T. Yildirim and A. B. Harris
Phys. Rev. B 73, 214446 – Published 29 June 2006

Abstract

We present a detailed study of the magnetic structure and spin waves in the Fe jarosite compound KFe3(SO4)2(OH)6 for the most general Hamiltonian involving one- and two-spin interactions which are allowed by symmetry. We compare the calculated spin-wave spectrum with the recent neutron scattering data of Matan et al. for various model Hamiltonians which include, in addition to isotropic Heisenberg exchange interactions between nearest (J1) and next-nearest (J2) neighbors, single-ion anisotropy and Dzyaloshinskii-Moriya (DM) interactions. We concluded that DM interactions are the dominant anisotropic interaction, which not only fits all the splittings in the spin-wave spectrum but also reproduces the small canting of the spins out of the Kagomé plane. A brief discussion of how representation theory restricts the allowed magnetic structure is also given.

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  • Received 9 March 2006

DOI:https://doi.org/10.1103/PhysRevB.73.214446

©2006 American Physical Society

Authors & Affiliations

T. Yildirim1 and A. B. Harris2

  • 1NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
  • 2Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA

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Issue

Vol. 73, Iss. 21 — 1 June 2006

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