Comparative study of superconducting and normal-state anisotropy in Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$ superconductors with controlled amounts of interstitial excess Fe

Yue Sun, Yongqiang Pan, Nan Zhou +8

We report a systematic study of the superconducting (SC) and normal-state anisotropy of Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$ single crystals with controlled amounts of excess Fe ($y$ = 0…