Effect of the substitutions of Ni3+, Co3+, and Fe3+ for Mn3+ on the ferromagnetic states of the La0.7Pb0.3MnO3 manganite

Abstract

The substitution at the Mn site of various transitional metal elements dramatically modifies the magnetic and electronic properties of the La0.7Pb0.3Mn0.8Me0.2O3 (Me=Ni, Co, and Fe) manganites. The powder x-ray diffraction pattern shows a single-phase rhombohedral distorted perovskite structure with space group R3̄c (No. 167) for all samples. The present article is focused on the effects induced by the partial substitution of Ni, Co, and Fe for the Mn site. The field cooled–zero field cooled curves indicate that the magnetic order is modified from a ferromagnetic long-range spin order for La0.7Pb0.3MnO3 to a spin cluster induced short-range spin order for all the doped compositions. The saturation magnetization, transition temperature, and resistance peak temperature decrease significantly from Ni-doped, Co-doped, to Fe-doped composition. In conclusion, the variation of the magnetic and electronic behaviors is due to the dissimilar 3d electron configuration of the substitutions.

Synthesis, electronic and magnetic properties of the double B mixed perovskite series La0.5Sr0.5Mn1−xFexO3

“…The substitution of the Mn ions by other transition metal ion, such as Cr, Fe, Co and Ni, can give rise to important modifications in the magnetic and transport properties [3][4][5][6][7][8]. Among others, Fe is particularly interesting, because it does not cause considerable lattice distortion [9] due to close ionic radii of Fe 3+ and Mn 3+ [10], which is a special model to study the unique properties of manganites.…”

Synthesis characterization of magnetic properties in La0.7−x Lnx Pb0.3 MnO3 (, Nd, Gd, Dy, Sm and Y) perovskite compounds

“…), with ABO 3 perovskite structure have attracted considerable investigation because of the discovery of colossal magnetoresistance (CMR) effect accompanied with rich variety of magnetic and electrical properties [1][2][3][4][5][6][7][8][9]. The partial substitution of divalent ions for the trivalent rare-earth ions induces ferromagnetism in these compounds due to the conversion of Mn 3+ (t 2g 3 e 1 g ) into Mn 4+ (t 2g 3 e 0 g ).…”

Magnetic behaviors and enhanced magnetoresistance in granular (La0. 7Pb0.3MnO3)1−x(Fe2O3)x composites

“…), have been the materials under extensive studies because of the rich varieties of crystallographic, magnetic and electronic phases [1][2][3][4][5]. These materials exhibit a large magnetoresistance ratio (MRR, defined as [ρ(H) -ρ(0)]/ρ(H)), termed as colossal magnetoresistance (CMR), which is greatly useful for various industrial applications.…”