Magnetic correlations in deuteronium jarosite, a model S=5/2 Kagome antiferromagnet
Abstract
Deuteronium jarosite, (D3O)Fe3(SO4)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 (θCW=-1500+-300K) and a spin-glass transition at Tf=13.8 K, while the magnetic contribution to the specific heat below Tf rises with T as T2, characteristic of two-dimensional propagating modes. Powder neutron diffraction reveals short-range magnetic correlations (=19+-2 Å) with a wavevector corresponding to the 3x3 spin structure at 1.9 K.
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