Wu G, Xie Y L, Chen H, Zhong M, Liu R H, Shi B C, Li Q J, Wang X F, Wu T, Yan Y J, Ying J J, Chen X H
Hefei National Laboratory for Physical Science at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China. Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
J Phys Condens Matter. 2009 Apr 8;21(14):142203. doi: 10.1088/0953-8984/21/14/142203. Epub 2009 Mar 9.
We synthesized the samples Sr(1-x)Sm(x)FFeAs with a ZrCuSiAs-type structure. These samples were characterized by resistivity and susceptibility. It is found that substitution of rare earth metal for alkaline earth metal in this system suppresses the anomaly in resistivity and induces superconductivity. Superconductivity at 56 K in nominal composition Sr(0.5)Sm(0.5)FFeAs is realized, indicating that the superconducting transition temperatures in the iron arsenide fluorides can reach as high as that in oxypnictides with the same structure.
我们合成了具有ZrCuSiAs型结构的样品Sr(1-x)Sm(x)FFeAs。通过电阻率和磁化率对这些样品进行了表征。研究发现，在该体系中用稀土金属替代碱土金属会抑制电阻率异常并诱导超导性。在标称成分Sr(0.5)Sm(0.5)FFeAs中实现了56K的超导性，这表明氟砷化铁中的超导转变温度可以达到与具有相同结构的氧氮化物一样高。
