Magnetic phase diagram of Ru-doped Sm1-xCaxMnO3 manganites: Expansion of ferromagnetism and metallicity - art. no. 174402

The substitution of ruthenium for manganese has been studied in the Sm1-xCa xMnO3 series, leading to a magnetic (T vs x) phase diagram where a large re gion of ferromagnetic metallic phases appears. These results are compared w ith those obtained by chromium doping in the same system, showing the much stronger effect of ruthenium. Other lanthanide series have also been charac terized in order to investigate the size effect in the ruthenium doped comp ounds. A comprehensive magnetic study by powder neutron diffraction has bee n performed on the Sm0.2Ca0.8Mn0.9Ru0.1O3 compound in connection with the p hase separation evidenced by the susceptibility;measurements. Finally, mode ls for orbital and spin ordering are proposed to explain the Cr and Ru indu ced ferromagnetism and metallicity.