Large-scale single-crystal growth of (CH₃)₂NH₂CuCl₃ for neutron scattering experiments

Neutron scattering studies on low-dimensional quantum spin systems require large-size single-crystals. Single-crystals of (CH₃)₂NH₂CuCl₃ showing low-dimensional magnetic behaviors were grown by a slow solvent evaporation method in a two-solvent system at different temperature settings. The best results were obtained for the bilayer solution of methanol and isopropanol with a molar ratio of 2:1 at 35°C. The quality of the obtained single-crystals was tested by powder and single-crystal X-ray diffraction and single-crystal neutron diffraction. In addition, to confirm structural phase transitions (SPTs), thermal analysis and single-crystal X-ray diffraction at 300 K and 175 K, respectively, were conducted, confirming the presence of a SPT at T_up=288 K on heating and T_down=285 K on cooling.