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The recently discovered natural minerals Cu3Zn(OH)6Cl2 and Cu3Mg(OH)6Cl2 arespin 1/2 systems with an ideal kagome geometry. Based on electronic structurecalculations, we develop a realistic model which includes couplings across thekagome hexagons beyond the original kagome model that are intrinsic in realkagome materials. Exact diagonalization studies for the derived model reveal astrong impact of these couplings on the magnetic ground state. Our predictionscould be compared to and supplied with neutron scattering, thermodynamic andNMR data.

Modified kagome physics in the natural spin-1/2 kagome lattice systems - kapellasite Cu3Zn(OH)6Cl2 and haydeeite Cu3Mg(OH)6Cl2