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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.
Matan, K., Grohol, D., Nocera, D. G., Yildirim, T., Harris, A. B., Lee, S. H., Nagler, S. E., & Lee, Y. S. (2006). SpinWaves in the Frustrated Kagomé Lattice Antiferromagnet KFe3(OH)6(SO4)2. Retrieved from https://repository.upenn.edu/physics_papers/193
Date Posted: 14 July 2011
This document has been peer reviewed.