Bulk Superconductivity in Fe1+yTe0.6Se0.4 Induced by Removal of Excess Fe

Abstract

Experimental evidences from transport, magnetic, and magneto-optical (MO) image measurements confirmed that arsenic (As) vapor annealing was another effective way to induce bulk superconductivity with isotropic, large, and homogenous superconducting critical current density (Jc) in Fe1+yTe0.6Se0.4 single crystal. Since As is an exotic and easily detectable heavy element to Fe1+yTe0.6Se0.4 single crystal, As vapor annealing is very advantageous for the study of annealing mechanism. Detailed micro-structural and elemental analyses exclude the possibility that intercalating or doping effect may happen in the other post-annealing methods, proving that Fe reacts with As on the surface of the crystal and the reaction itself acts as a driving force to drag excess Fe out. The removal of excess Fe results in the good superconductivity performance.

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Cited by in corpus (5)

• Evolution of superconducting and transport properties in annealed FeTe${}_{1-x}$Se${}_x$ (0.1 $\le$ $x$ $\le$ 0.4) multiband superconductors
• On the role of chalcogen vapor annealing in inducing bulk superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Bulk superconductivity in FeTe${}_{1-x}$Se${}_x$ via physicochemical pumping of excess iron
• Superconductivity in FeTe0.8S0.2 induced by battery-like reaction
• Effects of Iodine Annealing on Fe1+yTe0.6Se0.4