Phase separation and metallic conductivity in Tl0.4K0.4Fe2−ySe2−xSx Guolin Feng, Min Zuo, Shun Tan, Chuanying Xi, Langsheng Ling, Lei Zhang, Wei Tong, Hui Liu, Hongyan Yu, Li Pi et al. (2 more) EPL, 100 4 (2012) 47003 Published online: 29 November 2012 DOI: 10.1209/0295-5075/100/47003