Superconductivity at the vacancy disorder boundary in K${}_x$Fe${}_{2-y}$Se${}_2$

Chunruo Duan, Junjie Yang, Yang Ren +1

The role of phase separation in the emergence of superconductivity in alkali metal doped iron selenides A${}_x$Fe${}_{2-y}$Se${}_2$ (A = K, Rb, Cs) is revisited. High energy X-ray di…