Eur. Phys. J. B 13, 41-45 (2000)
https://doi.org/10.1007/s100510050008

Enhancement of magnetoresistance in cobaltites by manganese substitution: the oxide La_0.8Sr_0.2Co_1-xMn_xO₃

Laboratoire CRISMAT (UMR 6508 associée au CNRS) , ISMRA et Université de Caen, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex, France

Corresponding author: ^a antoine.maignan@ismra.fr

Received: 7 May 1999
Published online: 15 January 2000

Abstract

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.