Abstract
Inelastic neutron scattering measurements have revealed an abrupt change in the phonon damping at the 6 K anomaly in the quantum spin liquid candidate $\ensuremath{\kappa}$-(BEDT-TTF)${}_{2}$Cu${}_{2}$(CN)${}_{3}$. This is interpreted as a phase transition to the valence bond solid state on the basis of an effective model describing the spin-charge coupling in the dimer-Mott system.
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