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A new method to grow very high quality single crystals of the superconductingHgBa2CuO4+{\delta} mercury cuprates is reported. The single crystals areplatelet-shaped, with surfaces of high optical quality and goodcrystallographic properties. Annealing enables optimization of Tc up to Tcmax =94 K. With adequate treatment, the doping level of the crystalline samples canbe finely controlled in a wide under- and over-doped range. Complete structuralcharacterization from single crystal X-ray diffraction data is given for thefirst time for different doping levels. The role of added gold on the doping isalso investigated. The signature of under- and over-doping for both pure andgold-substituted crystals has been identified from micro-Raman spectroscopymeasurements.

Crystal Growth and Doping Control of HgBa2CuO4+{\delta}, the Model Compound for High-Tc Superconductors