Abstract
The structural and magneto-transport properties of electron-doped manganites (La 1− x Pr x ) 0.85Zr 0.15MnO 3 (Pr-doped LZMO) with x = 0 , 0.05, 0.10, 0.15, and 0.20 have been investigated. X-ray diffraction (XRD) patterns show that the Pr-doped LZMO has rhombohedral lattice structure with R 3 ¯ C space group. The Mn–O–Mn bond angle of the system refined by Rietveld technique decreases with increasing Pr content ranging from 165.38° for x = 0 to 163.64° for x = 0.20 . A significant distortion of the MnO 6 octahedra caused by the distinctively small Mn–O–Mn bond angle weakens the strength of Mn 2+–O–Mn 3+ double exchange (DE) interaction. The Curie temperature T C increases with increasing average A-site ionic radius, 〈 r A〉, and the magnetoresistance (MR) ratio decreases with increasing 〈 r A〉, strongly suggesting that the DE mechanism plays an important role in the charge transport property of the Pr-doped LZMO.
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