铁基氧磷化物超导体的低温快速合成与超导性。

Low-temperature rapid synthesis and superconductivity of Fe-based oxypnictide superconductors.

机构信息

CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, PR China.

出版信息

J Am Chem Soc. 2010 Mar 17;132(10):3260-1. doi: 10.1021/ja100055k.

DOI:10.1021/ja100055k

PMID:20170119

Abstract

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 Sm(0.85)Nd(0.15)FeAsO(0.85)F(0.15) were demonstrated.

摘要

铁基氧磷氮超导材料在较低的反应温度和更短的反应时间下成功合成，这得益于起始采用了不太稳定的化合物，这为反应提供了更大的驱动力。使用中间化合物的球磨粉末，在 1173 K 下仅需 20 分钟即可合成出 T(c)高于 50 K 的单相超导材料。这种方法特别有利于保留 F，一种增强超导性的挥发性掺杂剂。Sm(0.85)Nd(0.15)FeAsO(0.85)F(0.15)的体超导性和高达 392 T 的上临界场得到了证明。