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We use $^{79}$Br nuclear quadrupole resonance (NQR) to demonstrate that ultraslow lattice dynamics set in below the temperature scale set by the Cu-Cusuper-exchange interaction $J$~($\simeq160$~K) in the kagome lattice Heisenbergantiferromagnet Zn-barlowite. The lattice completely freezes below 50~K, and$^{79}$Br NQR lineshapes become twice broader due to increased latticedistortions. Moreover, the frozen lattice exhibits an oscillatory component inthe transverse spin echo decay, a typical signature of pairing of nuclear spinsby indirect nuclear spin-spin interaction. This indicates that some Br sitesform structural dimers via a pair of kagome Cu sites prior to the gradualemergence of spin singlets below $\sim30$~K. Our findings underscore thesignificant roles played by subtle structural distortions in determining thenature of the disordered magnetic ground state of the kagome lattice.

Freezing of the Lattice in the Kagome Lattice Heisenberg Antiferromagnet Zn-barlowite ZnCu$_3$(OD)$_6$FBr