Bulk Superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ Induced by Annealing in Se and S Vapor

Abstract

We reported that bulk superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ can be induced by annealing in Se and S vapor. The well-annealed samples show a large critical current density, emph{J}${}_c$ $\sim$ 2 - 4 $\times$ 10${}^5$ A/cm${}^2$. Combined with our previous reports about O${}_2$ and Te annealing effects, we proved that bulk superconductivity can be successfully induced in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ by annealing in atmosphere of all chalcogens, such as O, S, Se and Te.

2 pages, 3 figures