Intrinsic percolative superconductivity in KxFe2−ySe2 single crystals B. Shen, B. Zeng, G. F. Chen, J. B. He, D. M. Wang, H. Yang and H. H. Wen EPL, 96 3 (2011) 37010 Published online: 18 October 2011 DOI: 10.1209/0295-5075/96/37010