Abstract
We have investigated the effect of Pr-doping on the Nd-sites in the high magnetoresistance (MR) perovskite Nd 2 3 Sr 1 3 MnO 3 . For polycrystalline materials, negative MR as high as ∼ 235% is observed near 237K in pure Nd 2 3 Sr 1 3 MnO 3 . The substitution of Pr for Nd leads to a reduction in the overall MR, and an increase of the MR-peak temperature. We investigate the possibility that the large negative MR originates from the formation of localized magnetic polarons.
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