Abstract
We report on the magnetization, resistivity and magnetoresistance measurements on polycrystalline samples of Sm 0.55Sr 0.45− x Ce x MnO 3 ( x=0 and 0.05). Substitution of Ce( x=0.05) reduced the para–ferromagnetic transition from ∼140 K ( x=0) to ∼90 K. For x=0, the colossal magnetoresistance (CMR) (−100( ρ B − ρ 0)/ ρ 0) effect of 55% (143 K) was observed in a field of 0.6 Oe. On the other hand, for the x=0.05 sample, at 93 K, the CMR effect which was 32% in the field of 65 Oe increased to 87% in the field of 0.6 T. Our data rule out grain boundary effects as the principal cause but point out the applicability of the phase separation model.
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