Abstract
The effect of the monovalent chemical substitution of K + into Sr 2+ sites on the structural, magnetic and electrical properties of La 0.6Sr 0.4− x K x MnO 3 (0 ≤ x ≤ 0.15) has been investigated. The rhombohedral distorted perovskite structure with space group R 3 ¯ c is observed in this series of materials while the average size 〈 r A〉 and Mn 3+/Mn 4+ ratios are varied simultaneously. The Rietveld refinement of the structure shows that the substitution of Sr by K in the La site changes the structure parameters such as the Mn O bond length and Mn O Mn angles. An increase in the Mn O bond length with increasing K content leads to a decrease in the paramagnetic–ferromagnetic transition temperature T C and the metal–semiconductor transition temperature T p. A magnetoresistance ratio of about 38% at 300 K and in an applied field of 8 T has been observed in the bulk ceramic La 0.6Sr 0.25K 0.15MnO 3.
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