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We reported a detailed study of Fe1+yTe0.6Se0.4 single crystals annealed in the atmosphere of chalcogens (O2, S, Se, Te). After annealing with appropriate amount of chalcogens, Fe1+yTe0.6Se0.4 single crystals show Tc higher than 14K with a sharp transition width ∼1K. Critical current density Jc for the annealed crystals reach a very high value ∼2–4×105A/cm2 under zero field, and is also robust under...
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