Bulk Superconductivity in Fe1+yTe0.6Se0.4 Induced by Removal of Excess Fe
Bulk Superconductivity in Fe1+yTe0.6Se0.4 Induced by Removal of Excess Fe
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DOI：
10.7566/jpsj.83.064704
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发表时间：
2014-05
影响因子：
1.7
通讯作者：
W. Zhou;Yue Sun;Shuo Zhang;J. Zhuang;F. Yuan;Xiong Li;Zhixiang Shi;Tatsuhiro Yamada;Y. Tsuchiya;T. Tamegai
中科院分区：
文献类型：
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作者：
W. Zhou;Yue Sun;Shuo Zhang;J. Zhuang;F. Yuan;Xiong Li;Zhixiang Shi;Tatsuhiro Yamada;Y. Tsuchiya;T. Tamegai
来自输运、磁和磁光 (MO) 图像测量的实验证据证实，砷 (As) 蒸气退火是在 Fe1+yTe0.6Se0.4 单晶中诱导体超导的另一种有效方法，具有各向同性、大且均匀的超导临界电流密度 (Jc)。由于As对于Fe1+yTe0.6Se0.4单晶来说是一种外来且易于检测的重元素，因此As气相退火对于退火机理的研究非常有利。详细的微观结构和元素分析排除了其他后退火方法中可能发生插层或掺杂效应的可能性，证明Fe与晶体表面的As反应，并且反应本身作为驱动力将多余的Fe拖出。去除多余的Fe可以得到良好的超导性能。
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.