Enhancement of magnetoresistance in cobaltites by manganese substitution: the oxide La0.8Sr0.2Co1-xMnxO3
Laboratoire CRISMAT (UMR 6508 associée au CNRS) ,
ISMRA et Université de Caen, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex,
Corresponding author: a email@example.com
Published online: 15 January 2000
The substitution of manganese for cobalt in the perovskite has been studied. A significant increase of the magnetoresistance (MR) is obtained, reaching 60% at 5 K under 7 T for . This behavior originates from a spectacular increase of the resistivity correlated to a significant decrease of ferromagnetism by Mn doping. This enhancement of magnetoresistance can be interpreted by the growth of ferromagnetic clusters in the insulating matrix, by applying a magnetic field.
PACS: 71.30.+h – Metal-insulator transitions and other electronic transitions / 75.70.Pa – Giant magnetoresistance
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000