Abstract
In several series of samples (La 1− x Nd x ) 0.7Sr 0.3MnO 3 (0⩽ x⩽1), we studied the evolution of structure, magnetic and electrical properties with x and the average ionic radius of the A site 〈 r A〉, which systematically varied while keeping the ratio Mn 3+/Mn 4+ fixed. Based on the classical ceramic preparation method, the samples have perovskite-like structure with different degrees of distortion (rhombohedral and orthorhombic). With increasing Nd concentration, a systematic decrease in the ferromagnetic transition temperature ( T C), the metal semi-conducting transition temperature ( T p) and the cell volume is observed. Meanwhile, the size of the resistivity ρ increases near T C. This phenomenon is interpreted as a gradual bending of the Mn–O–Mn bond angle, with decreasing 〈 r A〉, which causes the narrowing of the electronic bandwidth and the effect of the A-site variance σ 2.
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