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The hole-doped kagome lattice of Cu2+ ions in LaCuO2.66 was investigated bynuclear quadrupole resonance (NQR), electron spin resonance (ESR), electricalresistivity, bulk magnetization and specific heat measurements. Fortemperatures above ~180 K, the spin and charge properties show an activatedbehavior suggestive of a narrow-gap semiconductor. At lower temperatures, theresults indicate an insulating ground state which may or may not be chargeordered. While the frustrated spins in remaining patches of the original kagomelattice might not be directly detected here, the observation of coexistingnon-magnetic sites, free spins and frozen moments reveals an intrinsicallyinhomogeneous magnetism. Numerical simulations of a 1/3-diluted kagome latticerationalize this magnetic state in terms of a heterogeneous distribution ofcluster sizes and morphologies near the site-percolation threshold.

Inhomogeneous magnetism in the doped kagome lattice of LaCuO2.66