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Magnetic susceptibility and specific heat of the spin-\({\frac{1}{2}}\) Heisenberg model on the kagome lattice and experimental data on ZnCu3(OH)6Cl2

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Abstract.

We compute the magnetic susceptibility and specific heat of the spin-\(\frac{1}{2}\) 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 kBT/J≃0.2, our calculations reproduce accurately the experimental susceptibility, with an exchange interaction J≃190 K 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 ~20 K) is smaller in ZnCu3(OH)6Cl2 than in the kagome Heisenberg model, a likely signature of other interactions in the system.

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Authors and Affiliations

  1. Service de Physique Théorique, CEA Saclay, 91191, Gif-sur-Yvette Cedex, France

    G. Misguich

  2. Laboratoire de Physique Théorique de la Matière Condensée, Univ. P. et M. Curie, 75252, Paris Cedex, France

    P. Sindzingre

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  1. G. Misguich
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  2. P. Sindzingre
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Correspondence to G. Misguich.

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Misguich, G., Sindzingre, P. Magnetic susceptibility and specific heat of the spin-\({\frac{1}{2}}\) Heisenberg model on the kagome lattice and experimental data on ZnCu3(OH)6Cl2 . Eur. Phys. J. B 59, 305–309 (2007). https://doi.org/10.1140/epjb/e2007-00301-6

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