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We analyze the experimental data for the magnetic susceptibility of thematerial ZnCu3(OH)6Cl2 in terms of the Kagome Lattice Heisenberg model (KLHM),discussing possible role of impurity spins, dilution, exchange anisotropy, andboth out-of-plane and in-plane Dzyaloshinsky-Moriya (DM) anisotropies, withexplicit theoretical calculations using the Numerical Linked Cluster (NLC)method and exact diagonalization (ED). The high-temperature experimental dataare well described by the pure Heisenberg model with J=170 K. We show that thesudden upturn in the susceptibility around T=75 K is due to DM interactions. Wealso observe that at intermediate temperatures, below T=J, our calculatedsusceptibility for KLHM fits well with a power law T^{-0.25}.Comment: 4 pages, 5 figures, published versio

physical review letters

Magnetic Susceptibility of the Kagome Antiferromagnet<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>ZnCu</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mo stretchy="false">(</mml:mo><mml:mi>OH</mml:mi><mml:msub><mml:mo stretchy="false">)</mml:mo><mml:mn>6</mml:mn></mml:msub><mml:msub><mml:mi>Cl</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>

Magnetic Susceptibility of the Kagome AntiferromagnetZnCu3(OH)6Cl2