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19 April 2024

» arxiv » 0908.2670

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Polarized neutron scattering studies of the kagome lattice antiferromagnet KFe3(OH)6(SO4)2
K. Matan ; J. S. Helton ; D. Grohol ; D. G. Nocera ; S. Wakimoto ; K. Kakurai ; Y. S. Lee ;
Date:	19 Aug 2009
Abstract:	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.
Source:	arXiv, 0908.2670
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