Kim, J.-H. ; Ji, S.; Lee, S.-H. ; Lake, B.; Yildirim, T. ; Nojiri, H. ; Kikuchi, H. ; Habicht, K. ; Qiu, Y. ; Kiefer, K.: External magnetic field effects on a distorted kagome antiferromagnet. Physical Review Letters 101 (2008), p. 107201/1-4
10.1103/PhysRevLett.101.107201
Abstract:
We report bulk magnetization, and elastic and inelastic neutron scattering measurements under an external magnetic field H on the weakly coupled distorted kagome system, Cu2ðODÞ3Cl. Our results show that the ordered state below 6.7 K is a canted antiferromagnet and consists of large antiferromagnetic ac components and smaller ferromagnetic b components. By first-principles calculations and linear spin wave analysis, we present a simple spin Hamiltonian with nonuniform nearest neighbor exchange interactions resulting in a system of coupled spin trimers with a single-ion anisotropy that can qualitatively reproduce the spin dynamics of Cu2ðODÞ3Cl.