Superconductivity in the iron selenide K x Fe 2 Se 2 (0≤x≤1.0)

By Jiangang Guo, Shifeng Jin, Gang Wang, Shunchong Wang, K. Zhu, Tingting Zhou, M. He, Xiaolong Chen. 2010

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Phase separation and magnetic order in K-doped iron selenide superconductor (2011, neutral): “dtd" [ ]> The newly discovered alkali-doped iron selenide superconductor”
Superconductivity in iron compounds (2011, background): “The rather short [2.67 Å in the 11, 2.77 Å in the 122 , Guo et al. (2010), up to 2.84 Å in the 21311 and 2.85 Å in the 1111, Ishida, Nakai, and Hosono, 2009; Ogino et al., 2009] Fe-Fe spacings insure that the 3d Fe electrons take part in band formation.”
Colloquium: The unexpected properties of alkali metal iron selenide superconductors (2012, background): “The report that started the area of research of alkali metal iron selenides was published by Guo et al. (2010).”
Magnetism and its microscopic origin in iron-based high-temperature superconductors (2012, background): “Four years after the initial discovery of superconductivity in LaFeAsO1−xFx [11], there are now three major families of iron-based superconductors: the iron pnictides [8, 9], iron chalcogenides [14, 61], and alkaline iron selenides [50, 51].”
Iron-based high transition temperature superconductors (2014, background): “FeSe-derived superconductors AxFe2−ySe2 also crystallize in 122 structure, which have a Tc of ∼ 30K in crystals grown by the hightemperaturemeltingmethod[40–43]orhigher than 40K by co-intercalation of alkali atoms and certain molecules (NH3 or organic) by a low-temperature solution route [46–49].”