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  • Title: Spin waves in the frustrated kagomé lattice antiferromagnet KFe3(OH)6(SO4)2.
    Author: Matan K, Grohol D, Nocera DG, Yildirim T, Harris AB, Lee SH, Nagler SE, Lee YS.
    Journal: Phys Rev Lett; 2006 Jun 23; 96(24):247201. PubMed ID: 16907274.
    Abstract:
    The spin wave excitations of the S=5/2 kagomé lattice antiferromagnet KFe3(OH)6(SO4)2 have been measured using high-resolution inelastic neutron scattering. We directly observe a flat mode which corresponds to a lifted "zero energy mode," verifying a fundamental prediction for the kagomé lattice. A simple Heisenberg spin Hamiltonian provides an excellent fit to our spin wave data. The antisymmetric Dzyaloshinskii-Moriya interaction is the primary source of anisotropy and explains the low-temperature magnetization and spin structure.
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