Emerging diluted ferromagnetism in high-Tc superconductors driven by point defect clusters Advanced Science 3, 1500295 (2016) J. Gazquez,*, R. Guzman, R. Mishra, E. Bartolomé, J. Salafranca, C. Magén, M. Varela, M. Coll, A. Palau, S. M. Valvidares, P. Gargiani, E. Pellegrin, J. Herrero-Martin, S. J. Pennycook, S.T. Pantelides, T. Puig, X. Obradors This study unveils the formation of ferromagnetic clusters embedded within the YBCO superconductor. Superconductivity and ferromagnetism are considered to be naturally exclusive phenomena; however, these results reveal the coexistence of ferromagnetic interactions much closer to high Tc superconductivity than previously suspected, which presents fundamental new physical insights.