Polarized neutron scattering studies of the kagome lattice antiferromagnet KFe3(OH)6(SO4)2

Details Polarized neutron scattering studies of the kagome lattice antiferromagnet KFe3(OH)6(SO4)2 Polarized neutron scattering studies of the kagome lattice antiferromagnet KFe3(OH)6(SO4)2

2009-08-19

arxiv.org/abs/0908.2670v1

Physica B, 404, 2529-2531 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

3 pages, 3 figures, Proceeding to the 7th International Workshop on Polarized Neutrons for Condensed Matter Investigations and

Scientific paper

10.1016/j.physb.2009.06.053

We report polarized neutron scattering studies of spin-wave excitations and spin fluctuations in the S=5/2 kagome lattice antiferromagnet KFe3(OH)6(SO4)2 (jarosite). Inelastic polarized neutron scattering measurements at 10 K on a single crystal sample reveal two spin gaps, associated with in-plane and out-of-plane excitations. The polarization analysis of quasi-elastic scattering at 67 K shows in-plane spin fluctuations with XY symmetry, consistent with the disappearance of the in-plane gap above the Neel temperature T_N = 65 K. Our results suggest that jarosite is a promising candidate for studying the 2D XY universality class in magnetic systems.

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