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

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

2006-02-02

arxiv.org/abs/cond-mat/0602036v2

Phys. Rev. Lett. 96, 247201 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.96.247201

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.

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