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

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arxiv 1405.6818 v1 pith:5OS6Y2XQ submitted 2014-05-27 cond-mat.supr-con

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

Wei Zhou , Yue Sun , Shuo Zhang , Jincheng Zhuang , Feifei Yuan , Xiong Li , Zhixiang Shi , Tatsuhiro Yamada
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Yuji Tsuchiya Tsuyoshi Tamegai
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classification cond-mat.supr-con
keywords annealingcrystalexcesssuperconductivityyte0bulkremovalsingle
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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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