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-xCaxMnO3 series, leading to a magnetic (T vs x) phase diagram where a large region of ferromagnetic metallic phases appears. These results are compared with those obtained by chromium doping in the same system, showing the much stronger effect of ruthenium. Other lanthanide series have also been characterized in order to investigate the size effect in the ruthenium doped compounds. A comprehensive magnetic study by powder neutron diffraction has been performed on the Sm0.2Ca0.8Mn0.9Ru0.1O3 compound in connection with the phase separation evidenced by the susceptibility;measurements. Finally, models for orbital and spin ordering are proposed to explain the Cr and Ru induced ferromagnetism and metallicity.