We have investigated the magnetic and the superconducting properties of the hybrid ruthenate-cuprate compound RuSr_{ 2}GdCu_{ 2}O_{ 8} by means of zero-field muon spin rotation- (ZF-$\mu $SR) and DC magnetization measurements. The DC-magnetisation data establish that this material exhibits ferromagnetic order of the Ru-moments ($\mu (Ru) \approx 1 \mu_{ B}$) below T_{ Curie} = 133 K and becomes superconducting at a much lower temperature T_c = 16 K. The ZF-$\mu $SR experiments indicate that the ferromagnetic phase is homogeneous on a microscopic scale and accounts for most of the sample volume. They also suggest that the magnetic order is not significantly modified at the onset of superconductivity.
Categories: cond-mat.supr-con cond-mat.str-el