Chemo-Structural Disorder in the kagomé spin = 1/2 systems ZnCu(OH)Cl and YCu(OH)Br[Br(OH)]
arXiv:2411.18331 · doi:10.1103/PhysRevB.111.024424
Abstract
By single crystal diffraction we characterize the chemo-structural disorder introduced by Zn-Cu site mixing in the kagomé spin -1/2 systems herbertsmithite ZnCu(OH)Cl and YCu(OH)Br[Br(OH)]. For an untwinned single crystal of herbertsmithite of composition ZnCuOHCl we find substitution by Cu of the Zn atoms in the layers separating the kagomé layers as well as substantial Zn substitution for Cu in the kagomé layers. In YCu(OH)Br[Br(OH)] site mixing disorder is present for intermediate . Analogous to the Cl homologous system in crystals with disorder is absent and a low-temperature structural transition emerges driven by strong magneto-phonon coupling as a release of frustration. Apart from this structural anomaly we find the physical properties of these crystals unchanged compared to intermediate and closely resembling the Cl homologue where long-range magnetic order was observed.
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