Magnetic susceptibility and specific heat of the spin- ${\frac{1}{2}}$ Heisenberg model on the kagome lattice and experimental data on ZnCu 3 (OH) 6 Cl 2

G. Misguich () and P. Sindzingre

The European Physical Journal B: Condensed Matter and Complex Systems, 2007, vol. 59, issue 3, 305-309

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 ZnCu 3 (OH) 6 Cl 2 obtained by Helton et al. [Phys. Rev. Lett. 98, 107204 (2007)]. Down to k B T/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 ZnCu 3 (OH) 6 Cl 2 than in the kagome Heisenberg model, a likely signature of other interactions in the system. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Keywords: 75.50.Ee Antiferromagnetics; 75.10.Jm Quantized spin models; 75.40.Cx Static properties (search for similar items in EconPapers)
Date: 2007
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Citations: View citations in EconPapers (1)

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DOI: 10.1140/epjb/e2007-00301-6

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