Spin waves in the Frustrated Kagome Lattice Antiferromagnet KFe3(OH)6(SO4)2

Abstract

The spin wave excitations of the ideal S=5/2 Kagome 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 Kagome 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.

4 pages, 3 figures

References in corpus (1)

• Spin chirality on a two-dimensional frustrated lattice

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