Abstract
The effect of ruthenium doping upon the appearance of metallicity and ferromagnetism in the series Sm1−xSrxMnO3 is studied and compared with that previously observed for Sm1−xCaxMnO3. It is shown that, in both cases, Ru doping is efficient in the region where charge ordering exists at long or short range, TC increasing significantly with the doping level. In contrast, in the antiferromagnetic electron-rich region of the Sm1−xSrxMnO3 series (x>0.6), which does not show charge ordering, no ferromagnetism is obtained by Ru doping, though TN is decreased. It is concluded that the huge effect of Ru doping in the appearance of ferromagnetism and metallicity originates from its ability to hinder the underlying charge and orbital ordering, allowing double exchange to be restored.
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