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The search for the resonating valence bond (RVB) state continues to underpinmany areas of condensed matter research. The RVB is made from the dimerisationof spins on different sites into fluctuating singlets, and was proposed byAnderson to be the reference state from which the transition to BCSsuperconductivity occurs. Little is known about the state experimentally, dueto the scarcity of model materials. Theoretical work has put forward the S =1/2 kagome antiferromagnet (KAFM) as a good candidate for the realization ofthe RVB state. In this paper we introduce a new model system, the S = 1/2 KAFMKapellasite, Cu3Zn(OH)6Cl2. We show that its crystal structure is a goodapproximation to a 2-dimensional kagome antiferromagnet and that susceptibilitydata indicate a collapse of the magnetic moment below T = 25 K that iscompatible with the spins condensing into the non-magnetic RVB state.

Toward Perfection: Kapellasite, Cu3Zn(OH)6Cl2, a New Model S = 1/2 Kagome Antiferromagnet