Electronic structure of magneticSr2RuO4

Ab initio electronic structure calculations on ${\mathrm{Sr}}_2{\mathrm{RuO}}_4,$ based on density functional theory within the generalized gradient approximation are reported. Contrary to calculations within the local density approximation, ferromagnetism is predicted. The results could have consequences for the interpretation of experiments which probe the Fermi surface and for the understanding of the unconventional superconductivity in ${\mathrm{Sr}}_2{\mathrm{RuO}}_4$.