Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-11-25
R. H. Colman, C. Ritter, A. S. Wills Chemistry of Materials 2008 20 (22), 6897-6899
Physics
Condensed Matter
Strongly Correlated Electrons
Communication, 3 pages, 3 figures
Scientific paper
10.1021/cm802060n
The search for the resonating valence bond (RVB) state continues to underpin many areas of condensed matter research. The RVB is made from the dimerisation of spins on different sites into fluctuating singlets, and was proposed by Anderson to be the reference state from which the transition to BCS superconductivity occurs. Little is known about the state experimentally, due to the scarcity of model materials. Theoretical work has put forward the S = 1/2 kagome antiferromagnet (KAFM) as a good candidate for the realization of the RVB state. In this paper we introduce a new model system, the S = 1/2 KAFM Kapellasite, Cu3Zn(OH)6Cl2. We show that its crystal structure is a good approximation to a 2-dimensional kagome antiferromagnet and that susceptibility data indicate a collapse of the magnetic moment below T = 25 K that is compatible with the spins condensing into the non-magnetic RVB state.
Colman Ross H.
Ritter Clemens
Wills Andrew S.
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