Calculated phase diagram of doped BaFe2As2 superconductor in a C4-symmetry breaking model Yuan-Yen Tai, Jian-Xin Zhu, Matthias J. Graf and C. S. Ting EPL, 103 6 (2013) 67001 Published online: 24 September 2013 DOI: 10.1209/0295-5075/103/67001