Susceptibility and specific heat of the Heisenberg antiferromagnet on the Kagomé lattice

Abstract The dynamic susceptibility of the S= 1 2 Heisenberg antiferromagnet is calculated on the Kagome lattice by means of a Green's function decoupling scheme. The spin–spin correlation functions decrease exponentially with distance. The specific heat exhibits a single-peak structure with a T2 dependence at low temperature and the correct high-temperature behaviour. The calculated total change in entropy indicates a ground-state entropy of 0.46 ln 2 .