Spin waves in the Frustrated Kagome Lattice Antiferromagnet KFe3(OH)6(SO4)2
arXiv:cond-mat/0602036 · doi:10.1103/PhysRevLett.96.247201
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