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Single crystals of $(Cd_{1-x} Zn_x)_3 As_2$ were synthesized fromhigh-temperature solutions and characterized in terms of their structural andelectrical properties. Based on the measurements of resistivity and Hallsignals, we revealed a chemical-doping-controlled transition from a threedimensional Dirac semimetal to a semiconductor with a critical point $x_c/sim0.38$. We observed structural transitions from a body-center tetragonal phaseto a primary tetragonal phase then back to a body-center tetragonal phase inthe solid solutions as well, which are irrelevant to the topological phasetransition. This continuously tunable system controlled by chemical dopingprovides a platform for investigating the topological quantum phase transitionof 3D Dirac electrons.

Topological Phase Transition in Single Crystals of $(Cd_{1-x} Zn_x)_3 As_2$