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Fine-tuning chemistry by doping with transition metals enables newperspectives for exploring Kitaev physics on a two-dimensional (2D) honeycomblattice of {\alpha}-RuCl3, which is promising in the field of quantuminformation protection and quantum computation. The key parameters to vary bydoping are both Heisenberg and Kitaev components of the nearest-neighborexchange interaction between the Jeff = 1/2 Ru3+ spins, depending strongly onthe peculiarities of the crystal structure. Here, we successfully grew singlecrystals of the solid solution series Ru1-xCrxCl3 with Cr3+ ions coupled to theRu3+ Kitaev host using chemical vapour transport reaction. The Cr3+substitution preserves the honeycomb type lattice of {\alpha}-RuCl3 with mixedoccupancy of Ru/Cr sites, no hints on cationic order within the layers werefound by single crystal X-ray diffraction and transmission electron microscopyinvestigations. In contrast to the high quality single crystals of{\alpha}-RuCl3 with ABAB ordered layers, the ternary compounds demonstrate asignificant stacking disorder along the c-axis direction evidenced by X-raydiffraction and high resolution scanning transmission electron microscopy(HR-STEM). Raman spectra of substituted samples are in line with a symmetryconservation of the parent lattice upon chromium doping. At the same time,magnetic susceptibility data indicate that the Kitaev physics of {\alpha}-RuCl3is increasingly repressed by the dominant spin-only driven magnetism of Cr3+ inRu1-xCrxCl3.

Detuning the Honeycomb of the {\alpha}-RuCl3 Kitaev lattice: A case of Cr3+ dopant