Abstract
Single-phase giant magnetoresistance (GMR) compounds were prepared by doping the parent compound, NdMnO3, with Sr at Nd sites. The resistivity of the doped samples showed two prominent regions (Δρ/ΔT 0, metallic). The doped samples exhibited an enhancement in double exchange (DE) interactions causing an increase in T c (transition temperature). Magnetic field decreased the resistance of all the samples because of the suppression of spin fluctuations and an increase in disorder in the system. The polaron and variable range hopping (VRH) models were good for studying the transport mechanism of electrons and understand their behavior at T > T c.
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