Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-04-08
Eur. Phys. J. B 59, 305 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
Minor revisions in the text and references. To appear in Eur. Phys. J. B
Scientific paper
10.1140/epjb/e2007-00301-6
We compute the magnetic susceptibility and specific heat of the spin-1/2 Heisenberg model on the kagome lattice with high-temperature expansions and exact diagonalizations. We compare the results with the experimental data on ZnCu3(OH)6Cl2 obtained by Helton et al. [Phys. Rev. Lett. 98, 107204 (2007)]. Down to k_BT/J~0.2, our calculations reproduce accurately the experimental susceptibility, with an exchange interaction J~190K and a contribution of 3.7% of weakly interacting impurity spins. The comparison between our calculations of the specific heat and the experiments indicate that the low-temperature entropy (below ~20K) is smaller in ZnCu3(OH)6Cl2 than in the kagome Heisenberg model, a likely signature of other interactions in the system.
Misguich Grégoire
Sindzingre Philippe
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