Abstract

Abstract The magnetic and transport properties of mixed-valence manganites La0.7−xSmxPb0.3MnO3 (x=0,0.1 and 0.3) are investigated. The x=0 phase is indexed in a rhombohedral structure ( R 3 c ) while the rest exhibit orthorhombic symmetry (Pnma). The increase of x causes a decrease in the spin–coupling interaction between the moments of Mn. Hence, the decrease of ferromagnetic transition temperature from 321 to 152 K and the saturation magnetization from 80.36 to 78.33 emu/g can be affected by the substitution of La by Sm.

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