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

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arxiv cond-mat/0602036 v2 pith:BSSJ32AE submitted 2006-02-02 cond-mat.str-el

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

K. Matan , D. Grohol , D. G. Nocera , T. Yildirim , A. B. Harris , S. H. Lee , S. E. Nagler , Y. S. Lee This is my paper
classification cond-mat.str-el
keywords spinkagomelatticeantiferromagnetkfe3modewaveanisotropy
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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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