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Low energy inelastic neutron scattering on single crystals of the kagome spinliquid compound ZnCu3(OD)6Cl2 (Herbertsmithite) reveals antiferromagneticcorrelations between impurity spins for energy transfers E < 0.8 meV (~J/20).The momentum dependence differs significantly from higher energy scatteringwhich arises from the intrinsic kagome spins. The low energy fluctuations arecharacterized by diffuse scattering near wavevectors (1 0 0) and (0 0 3/2),which is consistent with antiferromagnetic correlations between pairs ofnearest neighbor Cu impurities on adjacent triangular (Zn) interlayers. Thecorresponding impurity lattice resembles a simple cubic lattice in the dilutelimit below the percolation threshold. Such an impurity model can describeprior neutron, NMR, and specific heat data. The low energy neutron data areconsistent with the presence of a small spin-gap (Delta ~ 0.7 meV) in thekagome layers, similar to that recently observed by NMR. The ability todistinguish the scattering due to Cu impurities from that of the planar kagomeCu spins provides a new avenue for probing intrinsic spin liquid physics.

Correlated impurities and intrinsic spin liquid physics in the kagome material Herbertsmithite