Abstract
Inelastic neutron-scattering measurements were performed on single-crystal ${\text{Co}}_{3}{\text{V}}_{2}{\text{O}}_{8}$ wherein magnetic cobalt ions reside on distinct spine and cross-tie sites within kagome staircase planes. This system displays a rich magnetic phase diagram which culminates in a ferromagnetic ground state below ${T}_{C}\ensuremath{\sim}6\text{ }\text{K}$. We have studied the low-lying magnetic excitations in this phase within the kagome plane. Despite the complexity of the system at higher temperatures, linear spin-wave theory describes most of the quantitative detail of the inelastic neutron measurements. Our results show two spin-wave branches, the higher energy of which displays finite spin-wave lifetimes well below ${T}_{C}$, and that, surprisingly, the magnetic exchange coupling between Co moments on the spine sites is negligible.
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