Versatile control of the superconducting transition temperature in anti-ThCr 2 Si 2 -type Y 2 O 2 Bi via H, Li, or F doping.

In Y 2 O 2 Bi with Bi square net, H substitution and Li intercalation led to higher superconducting transition temperature ( T c ), while F substitution led to lower T c , where T c is universally scaled by unit cell tetragonality c / a . Li intercalated Y 2 O 2 Bi showed a higher T c than previously reported Y 2 O 2 Bi even for the similar c / a .