Fe-based superconductivity with Tc=31 K bordering an antiferromagnetic insulator in (Tl,K) FexSe2

By M. Fang, Hangdong Wang, C. Dong, Zujuan Li, C. Feng, Jian Chen, H. Yuan. 2011

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Superconductivity in iron compounds (2011, background): “Fang et al. (2011b) then reported Tc ¼ 20 K in TlFe1:7Se2 (nominal composition), and also— in order to affect the known (Zabel and Range, 1984) Fesublattice deficiency in the TlFe2Se2 compound—prepared single crystals of Tl1 yKyFexSe2 (1:50 x 1:88, 0:14 y 0:57) where the compositions were…”
Phase separation and magnetic order in K-doped iron selenide superconductor (2011, background): “not only reach a superconducting transition temperature as high as 32 K, but also exhibit unique characteristics that are absent from other iron-based superconductors, such as antiferromagnetically ordered insulating phase”
Iron-based high transition temperature superconductors (2014, background): “[43] Fang, MH, Wang, HD and Dong, CH et al.”
Colloquium: The unexpected properties of alkali metal iron selenide superconductors (2012, background): “From anomalies in magnetic susceptibilities, several of these efforts also reported the presence of antiferromagnetic (AFM) order in regimes that are insulating at all temperatures (M. H. Fang et al., 2011; Bao et al., 2011b).”