Significant enhancement of superconducting properties in the FeSe0.5Te0.5 bulks by minor Sn addition
Significant enhancement of superconducting properties in the FeSe0.5Te0.5 bulks by minor Sn addition
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添加少量 Sn 可显着增强 FeSe0.5Te0.5 块体的超导性能
DOI：
10.1016/j.matlet.2016.03.137
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发表时间：
2016
影响因子：
3
通讯作者：
Li Huijun
中科院分区：
文献类型：
--
作者：
Chen Ning;Liu Yongchang;Ma Zongqing;Li Huijun
Sn的加入提高了FeSe_（0.5）Te_（0.5）的体相超导性能，使起始转变温度升高，转变宽度变窄。在4.3K下，Sn掺杂样品的临界电流密度（Jc）在自场下约为7× 103 A cm-2，即使在60，000 Oe以上，仍保持在3× 102 A cm-2，远高于无Sn样品的临界电流密度。相组成和形貌表征表明，微量Sn的加入有利于超导相的形成，使其成分更接近理想相，并抑制了Fe 7Se 8杂质和非晶相的形成，有助于提高Jc。
Sn addition improves bulk superconducting properties of FeSe0.5Te0.5with the increase of onset transition temperature and sharpens the transition width. The critical current density (Jc) of Sn-added sample is about 7×103A cm−2in self field and maintains a stable value of 3×102A cm−2even beyond 60,000 Oe at 4.3 K, much higher than that of the Sn-free one. Phase compositions and morphology characterizations indicate that minor Sn addition facilitates the formation of the superconducting phase whose composition is closer to the ideal one, and suppresses the formation of Fe7Se8impurity and amorphous phase, which contribute to the improvement ofJc.