Magnetic ordering of the distorted kagome antiferromagnet YCu(OH)[Cl(OH)] prepared via optimal synthesis
arXiv:2103.13254 · doi:10.1103/PhysRevMaterials.5.064401
Abstract
Experimental studies of high-purity kagome-lattice antiferromagnets (KAFM) are of great importance in attempting to better understand the predicted enigmatic quantum spin-liquid ground state of the KAFM model. However, realizations of this model can rarely evade magnetic ordering at low temperatures due to various perturbations to its dominant isotropic exchange interactions. Such a situation is for example encountered due to sizable Dzyaloshinskii-Moriya magnetic anisotropy in YCu(OH)Cl, which stands out from other KAFM materials by its perfect crystal structure. We find evidence of magnetic ordering also in the distorted sibling compound YCu(OH)[Cl(OH)], which has recently been proposed to feature a spin-liquid ground state arising from a spatially anisotropic kagome lattice. Our findings are based on a combination of bulk susceptibility, specific heat, and magnetic torque measurements that disclose a Néel transition temperature of ~K in this material, which might feature a coexistence of magnetic order and persistent spin dynamics as previously found in YCu(OH)Cl. Contrary to previous studies of single crystals and powders containing impurity inclusions, we use high-purity single crystals of YCu(OH)[Cl(OH)] grown via an optimized hydrothermal synthesis route that minimizes such inclusions. This study thus demonstrates that the lack of magnetic ordering in less pure samples of the investigated compound does not originate from the reduced symmetry of spin lattice but is instead of extrinsic origin.
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- Chemo-Structural Disorder in the kagomé spin = 1/2 systems ZnCu(OH)Cl and YCu(OH)Br[Br(OH)]
- Six magnetization plateau phases in a spin-1/2 distorted kagome antiferromagnet: application to
- Lattice dynamics of the frustrated kagome compound Y-kapellasite
- Magnetic excitations in the 1/3 plateau state in InCu(OH)Cl
- Exerting chemical pressure on the kagome lattice as frustration control in the kapellasite family Cu(OH)(Cl,Br)