Abstract
In this study, we have investigated the annealing effects on FeTe0.55Se0.45 single crystals in S and Te atmospheres. FeTe0.55Se0.45 single crystals were prepared by self-flux method. The as-grown sample shows a rather broad superconducting transition temperature around 6 K and low superconducting volume fraction, which is due to the relatively low proportion of superconducting phase. After being annealed in different vapor atmospheres, their superconducting properties, such as superconducting transition temperature, critical current density Jc, and superconducting volume fraction, could be greatly improved. All experimental results suggest that the bulk superconductivity of FeTe0.55Se0.45 single crystals can be obtained after annealing and thus present another option to remove the excess Fe, which paves the way for further practical application.
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