Numerical study on the spin dynamics of the Kagome lattice antiferromagnet

Sakai, Toru

The Kagome lattice antiferromagnet is one of interesting frustrated spin systems. Particularly since several candidate materials of the S=1/2 quantum Kagome lattice antiferromagnet were synthesized, the experimental and theoretical studies have been accelerated very much. However, the spin dynamics of the Kagome lattice antiferromagnet is still unclear, although the neutron scattering, nuclear spin resonance, electron spin resonance etc. have already been performed for those materials. In order to solve the spin dynamics theoretically, we investigated some anisotropic Kagome lattice by the numerical diagonalization of finite-size clusters. As a result, a mechanism of the double peak structure in the temperature dependence of the specific heat was clarified. In addition we found an interesting field induced phenomenon, so called the magnetization ramp. We also calculate the dynamical spin correlation to compare with the neutron scattering experiment.