Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1801566 | Journal of Magnetism and Magnetic Materials | 2008 | 7 Pages |
Abstract
The structure, transport properties and the magnetoresistance behavior in the temperature interval 77-400 K of the perovskite-like lanthanum manganites La0.6Pb0.4âxMgx+yMnO3 (x=0, 0.1, 0.2 and y=0, 0.2) were investigated. Polycrystalline bulk samples were prepared by sol-gel self-combustion and subsequent heat treatment at 1000 °C for different times, 40, 80, 160 and 320 min. All manganites exhibit a peak in the resistivity around 200-250 K, below the ferromagnetic ordering temperature (320-330 K). An isotropic and negative magnetoresistance has been observed in all compounds. Magnetoresistance MR exhibits a peak in the temperature range 130-150 K, below SC-metal transition temperature. Magnitude of MR at the peaks was nearly 27% in the magnetic field of 2 T. At room temperature, a magnetoresistance of 9.5% for La0.6Pb0.2Mg0.2MnO3 composition was obtained. Longer heat treatment time enhanced the magnetorezistive properties.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Elena Rezlescu, Corneliu Doroftei, Paul Dorin Popa, Nicolae Rezlescu,