Magnetic Susceptibility of the Kagome Antiferromagnet ZnCu3(OH)6Cl2

Details Magnetic Susceptibility of the Kagome Antiferromagnet ZnCu3(OH)6Cl2 Magnetic Susceptibility of the Kagome Antiferromagnet ZnCu3(OH)6Cl2

2007-01-04

arxiv.org/abs/cond-mat/0701087v3

Phys. Rev. Lett. 98, 207204 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures, published version

Scientific paper

10.1103/PhysRevLett.98.207204

We analyze the experimental data for the magnetic susceptibility of the material ZnCu3(OH)6Cl2 in terms of the Kagome Lattice Heisenberg model (KLHM), discussing possible role of impurity spins, dilution, exchange anisotropy, and both out-of-plane and in-plane Dzyaloshinsky-Moriya (DM) anisotropies, with explicit theoretical calculations using the Numerical Linked Cluster (NLC) method and exact diagonalization (ED). The high-temperature experimental data are well described by the pure Heisenberg model with J=170 K. We show that the sudden upturn in the susceptibility around T=75 K is due to DM interactions. We also observe that at intermediate temperatures, below T=J, our calculated susceptibility for KLHM fits well with a power law T^{-0.25}.

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