Abstract
The mineral malachite, $\mathrm{Cu}{}_{2}(\mathrm{OD}){}_{2}\mathrm{CO}{}_{3}$, has a quantum spin-liquid ground state and no long-range magnetic order down to at least $T=0.4$ K. Inelastic neutron scattering measurements show that the excitation spectrum consists of dispersive gapped singlet-triplet excitations, characteristic of spin-1/2 dimer-forming Heisenberg antiferromagnets. We identify a distinct two-dimensional dimerized coupling scheme with strong interdimer coupling ${J}^{\ensuremath{'}}/{J}_{1}\ensuremath{\approx}0.3$ that places malachite between strongly coupled alternating chains, square lattice antiferromagnets, and infinite-legged ladders. The geometry of the interaction scheme resembles the staggered dimer lattice, which may allow unconventional quantum criticality.
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