Enhancement of magnetoresistance in cobaltites by manganese substitution: the oxide La 0.8 Sr 0.2 Co 1-x Mn x O 3 |
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| Authors: | A. Maignan C. Martin M. Hervieu B. Raveau |
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| Affiliation: | (1) Laboratoire CRISMAT (UMR 6508 associée au CNRS), ISMRA et Université de Caen, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex, France, FR |
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| Abstract: | The substitution of manganese for cobalt in the perovskite La 0.8 Sr 0.2 CoO 3 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. Received 7 May 1999 |
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| Keywords: | PACS. 71.30.+h Metal-insulator transitions and other electronic transitions - 75.70.Pa Giant magnetoresistance |
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