Abstract.
The doping of Mn site with ruthenium, in the n-type manganite Sm0.2Ca0.8MnO3, has been studied using magnetic and transport measurements. We show that Ru induces a ferromagnetic metallic state at low temperature in this Mn4+ rich compound, a metal to metal transition replacing the metal to insulator one in the pristine phase. A spectacular increase of Tc up to 240 K is achieved, together with CMR effect. Based on thermoelectric power measurements, we propose that Ru(V) could be at the origin of these exceptional properties, due to ferromagnetic superexchange interactions between Ru(V) and Mn(III), forming in a first step ferromagnetic metallic clusters in the C-type antiferromagnetic insulating matrix.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Received 2 March 2000
Rights and permissions
About this article
Cite this article
Martin, C., Maignan, A., Hervieu, M. et al. Extension of ferromagnetism and metallicity to electron-rich manganites by Ru-doping: Generation of new CMR oxides Sm 0.2Ca0.8Mn1-xRuxO3 . Eur. Phys. J. B 16, 469–474 (2000). https://doi.org/10.1007/s100510070205
Issue Date:
DOI: https://doi.org/10.1007/s100510070205