Superconductivity enhanced by Se doping in Eu3Bi2(S,Se)4F4 P. Zhang, H. F. Zhai, Z. J. Tang, L. Li, Y. K. Li, Q. Chen, J. Chen, Z. Wang, C. M. Feng, G. H. Cao and Z. A. Xu EPL, 111 2 (2015) 27002 Published online: 11 August 2015 DOI: 10.1209/0295-5075/111/27002