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Evolution of Superconductivity in Fe<sub>1+<i>y</i></sub>Te<sub>1-<i>x</i></sub>Se<sub><i>x</i></sub>Annealed in Te Vapor
We report a detailed study of the Te vapor annealing effect in Fe$_{1+y}$Te$_{0.6}$Se$_{0.4}$ single crystals. Bulk superconductivity can be gradually induced by annealing with increasing amount of Te, until the molar ratio of Te to the sample reaches 1 : 10. By further increasing Te molar ratio, superconducting volume is …