First-principles study of electronic and magnetic properties in Co doped BaTiO3 Dan Cao, Biao Liu, Hailin Yu, Wangyu Hu and Mengqiu Cai Eur. Phys. J. B, 88 3 (2015) 75 Published online: 25 March 2015 DOI: 10.1140/epjb/e2015-50491-1