Fe-based superconductivity with Tc = 31 K bordering an antiferromagnetic insulator in (TI,K) FexSe2Ming-Hu Fang, Hang-Dong Wang, Chi-Heng Dong, Zu-Juan Li, Chun-Mu Feng, Jian Chen and H. Q. YuanEPL, 94 2 (2011) 27009DOI: https://doi.org/10.1209/0295-5075/94/27009