Low-Temperature Rapid Synthesis and Superconductivity of Fe-Based Oxypnictide Superconductors
Low-Temperature Rapid Synthesis and Superconductivity of Fe-Based Oxypnictide Superconductors
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DOI：
10.1021/ja100055k
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发表时间：
2010-03-17
影响因子：
15
通讯作者：
Jiang, Mian-Heng
中科院分区：
文献类型：
--
作者：
Fang, Ai-Hua;Huang, Fu-Qiang;Jiang, Mian-Heng
通过以稳定性较差的化合物为起始原料（这为反应提供了更大的驱动力），在更低的反应温度和更短的反应时间下成功合成了铁基氧磷族化合物超导体。利用中间化合物的球磨粉末，在1173 K下20分钟内合成了临界温度（\(T_{c}\)）高于50 K的纯相超导体。这种方法对于保留氟（一种能增强超导性的挥发性掺杂剂）特别有利。在\(Sm_{0.85}Nd_{0.15}FeAsO_{0.85}F_{0.15}\)中展示了体超导性以及高达392 T的高上临界场。
Fe-based oxypnictide superconductors were successfully synthesized at lower reaction temperatures and with shorter reaction times made possible by starting with less stable compounds, which provide a larger driving force for reactions. Using ball-milled powders of intermediate compounds, phase-pure superconductors with T-c above 50 K were synthesized at 1173 K in 20 min. This method is particularly advantageous for retaining F, a volatile dopant that enhances superconductivity. Bulk superconductivity and high upper critical fields up to 392 T in Sm0.85Nd015FeAsO0.85F0.15 were demonstrated.