Sustained phase separation and spin glass in Co-doped K${}_x$Fe${}_{2-y}$Se${}_2$ single crystals

Hyejin Ryu, Kefeng Wang, M. Opacic +5

We present Co substitution effects in K${}_x$Fe${}_{2-y-z}$Co${}_z$Se${}_2$ (0.06 $\le$ $z$ $\le$ 1.73) single crystal alloys. By 3.5\% of Co doping superconductivity is suppressed…