Superconductivity at 55 K in Iron-Based F-Doped Layered Quaternary Compound Sm[O1-xFx]FeAs

By 任治安, 陆伟, 杨杰, 衣玮, 慎晓丽, 李正才, 车广灿, 董晓莉, 孙力玲, 周放. 2008

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London penetration depth in iron-based superconductors (2011, background): “After the initial discoveries of superconductivity in Fe-based superconductors, first in LaFePO with Tc ≈ 4 K [1] and then in LaFeAs(O1−xFx) with Tc ≈ 26 K [2], Tc as high as 55 K has been reported in SmFeAs(O1−xFx) [3].”
Novel BiS2-based layered superconductor Bi4O4S3 (2012, background): “Soon after the discovery, SmFeAsO1-xFx was reported to be a superconductor with Tc > 55 K.(6,7) To date, over 50 Fe-based superconductors with a layered structure, basically composed of superconducting layers of Fe-pnictogen (Fe2As2 or Fe2P2) or Fe-chalcogen (Fe2Se2 or Fe2Te2) layers and spacer laye”
Phase diagram and electronic indication of high-temperature superconductivity at 65 K in single-layer FeSe films. (2012, background): “3, both the Tc∼60 K for the sequence 13 and Tc∼65 K for the sequence 15 have exceeded the transition temperature record (∼55 K)[7] that has been kept so far in the Fe-based superconductors.”