Annealing in O2, S, Se, Te, P, As, Sb, or I vapors removes interstitial excess iron from Fe1+yTe1-xSe and turns weak filamentary superconductivity into bulk superconductivity with Tc up to about 14.3 K.
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Review of annealing effects and superconductivity in Fe$_{1+y}$Te$_{1-x}$Se$_x$ superconductors
Annealing in O2, S, Se, Te, P, As, Sb, or I vapors removes interstitial excess iron from Fe1+yTe1-xSe and turns weak filamentary superconductivity into bulk superconductivity with Tc up to about 14.3 K.