External magnetic field effects on a distorted kagome antiferromagnet

Details External magnetic field effects on a distorted kagome antiferromagnet External magnetic field effects on a distorted kagome antiferromagnet

2008-06-04

arxiv.org/abs/0806.0767v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 figures

Scientific paper

10.1103/PhysRevLett.101.107201

We report bulk magnetization, and elastic and inelastic neutron scattering measurements under an external magnetic field, $H$, on the weakly coupled distorted kagome system, Cu_{2}(OD)_3Cl. 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-principle calculations and linear spin wave analysis, we present a simple spin hamiltonian with non-uniform 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 Cu_{2}(OD)_3Cl.

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