Magnetic phase transformation in La0.7-Bi Sr0.3MnO3 (0.25 ≤ x ≤ 0.40)

Finite-size effects on the evolution of magnetic correlations and magnetocaloric properties of Pr0.4Bi0.2Sr0.4MnO3

“…However, the bulk PB20SMO-160 (D = 160 nm) sample shows a hump in FC at T ˂ 200 K which could be attributed to the disordered antiferromagnetic (AFM) interactions in the system. Similar low-temperature hump in FC curve has been noticed in case of La 0.7-x Bi x Sr 0.3 MnO 3 (x = 0.30 and 0.35) [46,48,55]. The decrease in T C with Bi 3+ substitution can be explained considering the increase in unit cell volume.…”

Effect of Particle Size on Magnetic Phase Coexistence in Nanocrystalline La0.4Bi0.3Sr0.3MnO3

“…The detailed methodology of the bulk synthesis is reported elsewhere [42,43]. In the second step, the sintered pellets obtained at the end of the first step were crushed into a fine powder and then subjected to high-energy planetary ball milling to prepare nanoparticles.…”

“…Whereas in case of Bi 3+ substituted NdCaMnO 3 [39] and NdSrMnO 3 [40], an interplay between charge ordering and antiferromagnetism has been observed. The detailed analysis of our study describes that the systematic replacement of La 3+ with Bi 3+ in La 0.7−x Bi x Sr 0.3 MnO 3 bulk polycrystals results in a cross-over from dominant FM interaction (x ≤ 0.25) to AFM interactions (x ≥ 0.4) with magnetic phase coexistence for x = 0.3 and 0.35 [10,[41][42][43][44][45]. Though x = 0.35 represents the half-doped regime of La 3+ and Bi 3+ , where it is expected to have competitive phase coexistence of FM and AFM ground state [42,44], we found that it is more AFM compared to x = 0.3.…”

“…The detailed analysis of our study describes that the systematic replacement of La 3+ with Bi 3+ in La 0.7−x Bi x Sr 0.3 MnO 3 bulk polycrystals results in a cross-over from dominant FM interaction (x ≤ 0.25) to AFM interactions (x ≥ 0.4) with magnetic phase coexistence for x = 0.3 and 0.35 [10,[41][42][43][44][45]. Though x = 0.35 represents the half-doped regime of La 3+ and Bi 3+ , where it is expected to have competitive phase coexistence of FM and AFM ground state [42,44], we found that it is more AFM compared to x = 0.3. Thus, in the present work, we have chosen the phasecoexistence compound, La 0.4 Bi 0.3 Sr 0.3 MnO 3 (x = 0.3) and subjected it to high-energy planetary ball mill for reducing the particle size.…”

“…As Mn 3 O 4 orders magnetically only below 50 K (T N ~ 42 K) [48], we have restricted all our studies down to 50 K only. Figure 7 shows the (T) plots recorded in the temperature range 50-360 K. As the temperature is lowered from 360 K, a clear transition from paramagnetic (PM) to ferromagnetic (FM) state is observed at T C = 295 K (determined from the minima of dM/dT curve) for LB3SMO-0 sample [42,43]. In the case of LB3SMO-12 and LB3SMO-24 samples, the PM to FM transition appears to be broadened and completely suppressed in the case of LB3SMO-48 sample.…”