2007/04/30 by Grégoire Misguich, Gregoire Misguich, Philippe Sindzingre · 6 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Condensed matter physics #Exchange interaction #Ferromagnetism #Heisenberg model #Impurity #Lattice (music) #Magnetic susceptibility #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Specific heat #Spins #Thermodynamics #Topological Materials and Phenomena #cond-mat.stat-mech #cond-mat.str-el
paper · pdf · doi:10.1140/epjb/e2007-00301-6
published as Eur. Phys. J. B 59, 305 (2007) · Minor revisions in the text and references. To appear in Eur. Phys. J. B
openalex publication_date 2007/10/01 · arxiv created 2007/10/26 · arxiv updated 2011/11/09 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 kBT/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.