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.

arXiv comment4 pages, 3 figures

References in corpus (7)

• First excitations of the spin 1/2 Heisenberg antiferromagnet on the kagomé lattice
• Local spin resonance and spin-Peierls-like phase transition in a geometrically frustrated antiferromagnet
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• Spin-1/2 Kagome Like Lattice in Volborthite Cu3V2O7(OH)2-H2O
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• Magneto-thermodynamics of the spin-1/2 Kagome antiferromagnet
• Less than 50% sublattice polarization in an insulating S=3/2 kagome' antiferromagnet at low T

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