Spin-waves in antiferromagnetic Kagome lattice
Abstract
We have used inelastic neutron scattering to study spin-waves in single crystal samples of the antiferromagnetic kagome lattice compound, KFe_3(OH)_6(SO_4)_2. The 5/2 Fe^3+ spins on the kagome lattice order three dimensionally for temperatures below the Neel temperature, TN = 65 K. Spin-waves were measured at T = 10 K, much lower than T_N. We have observed a novel weakly dispersive ``zero-energy mode'', which is a consequence of the geometrical frustration. A spin Hamiltonian, which includes nearest-neighbor, second-nearest-neighbor interactions, easy-plane and easy-axis anisotropies, provides a good fit to our spin-wave data. We will discuss the implications of our results for the physics of the ideal kagome lattice.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2004
- Bibcode:
- 2004APS..MARN25004M