Lattice effect in Pr doped LaSrMnO perovskite

The Crystallographic and Magnetoresistance of CaF2 Doped Nd0.67Sr0.33MnO3 Compounds

“…Under our experimental conditions, the lattice spacings of #uoride (Nd, Sr)MnO compounds decrease and the average ionic radius of the La site 1r2 also decreases. Thus, the experimental results are the same as those reported before (26,27); that is, the Curie temperature decreases and the MR ratio rises. Meanwhile, magnetic order and signi"cant magnetoresistance e!ects are noted at low temperature.…”

“…and the magnetoresistance transition temperature ¹ K tends to increase. According to recent reports (26,27), with a decrease in the average ionic radius of the La CaF DOPED Nd Sr MnO site 1r2, ¹ ! decreases; however, the MR ratio increases.…”

Effect of the A Cation Size on the Structural, Magnetic, and Electrical Properties of Perovskites (La1−xNdx)0.7Sr0.3r003nMnO3

“…The electrical and magnetic properties have been understood within the framework of the double exchange (DE) model (5}8). The motion of the e electron can be strongly in#uenced by the average ionic radius of the A site 1r 2 which exhibits a close relationship between the bending of the Mn}O}Mn bond angle and the narrowing of the electronic band width (9,10). Intense interest in this system was revived after the discovery of colossal magnetoresistance (CMR) in the metallic phase of the system (11}13).…”

Magnetic and magnetocaloric properties of nano-sized La0.8Ca0.2Mn1−x Fe x O3 manganites prepared by sol–gel method

“…A large MCE in La 1-x A x MnO 3 polycrystalline samples (0.2 B x B 0. 33) is reported by Guo et al [14,15]. In fact, for DH = 1.5 T, the DS M j j reaches a maximum of about 5.5 J/(kg K) at 230 K, 4.7 J/(kg K) at 224 K, and 4.3 J/ (kg K) at 260 K for x = 0.2, 0.25, and 0.33, respectively [14].…”