Superconductivity at T_c ~ 14 K in Single Crystalline FeTe${}_{0.61}$Se${}_{0.39}$

Abstract

Single crystalline FeTe${}_{0.61}$Se${}_{0.39}$ with a sharp superconducting transition at $T_{\text{c}}\sim$ 14 K is synthesized via slow furnace cooling followed by low-temperature annealing. The effect of annealing on the chemical and superconducting inhomogeneities is carefully characterized. We also report resistivity, magnetization, and magneto-optical images of this crystal. Based on the Bean model, critical current density is estimated to exceed $1\times 10^5$ A/cm${}^2$ below 5 K under zero field. Weak fish-tail effect is identified at lower temperatures.

arXiv comment4 pages, 4 figures

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