Abstract
Abstract New RP-type phases Sr 2 LaMnFeO 7 and Sr 2 LaMn 1.5 Fe 0.5 O 7 have been synthesised by the ceramic method. Rietveld profile analysis shows that these phases crystallize with tetragonal unit cell in the space group I 4/ mmm . Sr 2 LaMn 1.5 Fe 0.5 O 7 shows insulator–metal (I–M) transition at low temperatures, the phenomenon often associated with giant magnetoresistance. 3D variable range hopping governs the electrical conduction in the insulator region above the I–M transition temperature. Magnetic studies suggest that the Curie temperature ( θ ) is positive.
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