Magnetism and optical properties of Co doped Sr2RuO4

Magnetic and optical properties of a single phase Co-doped Sr₂RuO₄ p-type superconductor are reported in this article. A ferromagnetic instability may occur in the doping range less than 10%, which may be related to the static, short-range ferromagnetic order in Sr₂RuO₄. This indicates that its superconductivity is related to ferromagnetic instability. It is shown that the coupling between Co and Ru enhances the ferromagnetism which is due to exchange interactions. In-situ temperature dependence of Raman spectroscopy and X-ray diffraction studies show an unstable phase at 10-30% doping concentrations. UV-vis measurements show that the optic band increases with Co doping.