The contribution of grain boundary and defects to the resistivity in the ferromagnetic state of polycrystalline manganites

Investigation on structural, magneto-transport, magnetic and thermal properties of La0.8Ca0.2−xBaxMnO3 (0⩽x⩽0.2) manganites

“…It is observed that as Ba-content increases, the metal insulator transition temperature T MI monotonically shifts towards higher temperature region. Pristine sample exhibits T MI around 210 K, which is matching with that reported in literature [13,28]. We now explain the reasons for the observed increase of T MI with Ba content.…”

“…It is observed from literature that dopants with larger ionic radii strongly influence the mismatch factor σ 2 [1,[24][25][26]. In fact among the dopants like Ba, Sr and Pb, the mismatch factor is biggest for Ba-doping [28]. There are several reports on the grain size effect on the structural, electrical and transport properties of these manganites [29][30].…”

Effect of Ba substitution on structural, electrical and thermal properties of La0.65Ca0.35−Ba MnO3 (0 ⩽x⩽ 0.25) manganites

“…Recent reports [2,[22][23][24] suggest that A-site doping of ions with a larger difference in ionic radius increases the mismatch factor r 2 and strongly influences the transition temperatures T C and T MI . There are several reports on the grain size effect on the structural, electrical and transport properties of these manganites [25][26][27]. In particular, the physical properties of barium doped manganites, e.g.…”

Possible origin of photoconductivity in La0.7Ca0.3MnO3

“…22 Figure 1 shows the core-level XPS spectra for the studied sample. 22 Figure 1 shows the core-level XPS spectra for the studied sample.…”