摘要翻译:
我们用高温展开和精确对角化计算了自旋1/2海森堡模型在kagome晶格上的磁化率和比热。我们将所得结果与Helton等人在ZnCu3(OH)6Cl2上的实验数据进行了比较。[Phys.Rev.Lett.98,107204(2007)]。在K_bt/J~0.2范围内,我们的计算准确地再现了实验磁化率,其中交换相互作用J~190K,弱相互作用杂质自旋的贡献为3.7%。比热计算与实验结果的比较表明,ZnCu3(OH)6Cl2的低温熵(20K以下)比kagome Heisenberg模型小,这可能是体系中其他相互作用的特征。
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英文标题:
《Magnetic susceptibility and specific heat of the spin-1/2 Heisenberg
model on the kagome lattice and experimental data on ZnCu3(OH)6Cl2》
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作者:
Gregoire Misguich and Philippe Sindzingre
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最新提交年份:
2007
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分类信息:
一级分类:Physics 物理学
二级分类:Strongly Correlated Electrons 强关联电子
分类描述:Quantum magnetism, non-Fermi liquids, spin liquids, quantum criticality, charge density waves, metal-insulator transitions
量子磁学,非费米液体,自旋液体,量子临界性,电荷密度波,金属-绝缘体跃迁
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一级分类:Physics 物理学
二级分类:Statistical Mechanics 统计力学
分类描述:Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变,热力学,场论,非平衡现象,重整化群和标度,可积模型,湍流
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英文摘要:
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.
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PDF链接:
https://arxiv.org/pdf/704.1017