Phase-separation control of K${}_x$Fe${}_{2-y}$Se${}_2$ superconductor through rapid-quenching process

Yusuke Yanagisawa, Masashi Tanaka, Aichi Yamashita +5

K${}_x$Fe${}_{2-y}$Se${}_2$ exhibits an iron-vacancy ordering at $T_{\mathrm{s}}\sim 270°$C and separates into two phases: a minor superconducting (iron-vacancy-disordered) phase and a majo…