Superconductivity at Tc 14 K in Single Crystalline FeTe₀.₆₁Se₀.₃₉

الأصل · EN

Single crystalline FeTe₀.₆₁Se₀.₃₉ with a sharp superconducting transition at Tc 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 × 10⁵ A/cm² below 5 K under zero field. Weak fish-tail effect is identified at lower temperatures.