Half-metallicity in Rh-doped TiO2 from ab initio calculations Z.Y. Tan, L.L. Wang, Y.C. Yang and W.Z. Xiao Eur. Phys. J. B, 85 4 (2012) 138 Published online: 26 April 2012 DOI: 10.1140/epjb/e2012-20848-1