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Despite the discovery of new superconductors classes, high-Tc oxides continueto be a current topic, because of their complex phase diagrams anddoping-dependant effects (allowing one to investigate the interaction betweenorbitals), as well as structural properties such as lattice distortion andcharge ordering, among many others. Ruthenocuprates are magneticsuperconductors in which the magnetic transition temperature is much higherthan the critical superconducting temperature, making them unique compounds.With the aim of investigating the dilution of the magnetic Ru sub-lattice, weproposed the synthesis of the new Ru1-xRexSr2GdCu2Oy ruthenocupratetype family,adapting the known two-step process (double perovskite + CuO)by directly dopingthe double perovskite, thus obtaining the new perovskite compoundSr2GdRu1-xRexOy, which represents a new synthesis process to the best of ourknowledge. Our samples were structurally characterised through X-raydiffraction, and the patterns were analysed via Rietveld refinement. A completemagnetic characterisation as a function of temperature and applied field, aswell as transport measurements were carried out. We discuss our results in thelight of the two-lattice model for ruthenocuprates, and a relation between RuO2(magnetic) and CuO2 (superconductor) sublattices can clearly be observed.

Magnetic, electrical and structural properties of the new Re-doped ruthenocuprate Ru1-xRexSr2GdCu2Oy