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Magnetic correlations in deuteronium jarosite, a model S=5/2 Kagome antiferromagnet

A. S. Wills·A Harrison·S. A. M. Mentink·T. E. Mason·Z. Tun
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Abstract

Deuteronium jarosite, (D_3O)Fe_3(SO_4)_2(OD)_6, contains a kagome lattice of Heisenberg spins, S=5/2, with a coverage of 97+-1%. DC and AC susceptibility measurements show strong in-plane antiferromagnetic exchange (θ_CW=-1500+-300K) and a spin-glass transition at T_f=13.8 K, while the magnetic contribution to the specific heat below T_f rises with T as T^2, characteristic of two-dimensional propagating modes. Powder neutron diffraction reveals short-range magnetic correlations (\xsi=19+-2 Å) with a wavevector corresponding to the \sqrt{3}x\sqrt{3} spin structure at 1.9 K.

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A. S. Wills, A Harrison, S. A. M. Mentink, T. E. Mason, Z. Tun. 1996-07-15. Magnetic correlations in deuteronium jarosite, a model S=5/2 Kagome antiferromagnet. https://arxiv.org/abs/cond-mat/9607106

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