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

1996/07/15 by A. S. Wills, A Harrison, Wills, A. S. +7
Physics and Astronomy · #Condensed Matter (cond-mat) #FOS: Physical sciences #cond-mat

paper · pdf · doi:10.48550/arxiv.cond-mat/9607106

postscript manuscript and 4 postscript figures, submitted to Physical Review Letters

arxiv created 1996/07/15 · arxiv updated 2009/11/30

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 (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 T², characteristic of two-dimensional propagating modes. Powder neutron diffraction reveals short-range magnetic correlations (\xsi=19+-2 Å) with a wavevector corresponding to the √(3)x√(3) spin structure at 1.9 K.

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