Magnetovolume effect in the paramagnetic phase of Sm1−xSrxMnO3 (x=0.45,0.33) compounds

Ultrasonic and elastic moduli evidence for Curie temperature (Tc) in Sm1−xSrxMnO3 perovskite magnetic materials at x=0.25, 0.30, 0.37, 0.40 and 0.44

“…1 and 2) is mainly due to the existence of linear magnetostriction effect rather than volume magnetostriction effect as observed in Sm 1−x Sr x MnO 3 perovskite manganite material (x = 0.33 and 0.45) [30]. The existence of strong spin-phonon interactions in perovskite manganite materials is a cause for this anomaly at T c .…”

Giant negative magnetoresistance in the vicinity of the ferromagnetic phase transition TC in Sm0.55Sr0.45MnO3

“…As it follows from the results obtained by Martin et al [13], Abramovich et al [14], Marquina et al [4] and Abramovich et al [15,16], the compound Sm 0.55 Sr 0.45 MnO 3 turned out to be pure single-phase perovskite with the orthorhombic Pnma space group. Its lattice parameters are equal to: a = 5.424(1)Å, b = 7.678(2)Å and c = 5.434(2)Å.…”

“…For the Mn 3+ -rich manganites (x < 0.50), where the main charge carriers are holes, the double exchange Mn 3+ -O-Mn 4+ ferromagnetic interactions predominate [1][2][3][4]. For such compounds the colossal magnetoresistance results from the paramagnetic insulator-ferromagnetic metal phase transition induced by the magnetic field [5].…”

Insulator-metal transition shift related to magnetic polarons in La 0.67- xY xCa 0.33MnO 3

“…More and more theoretical calculations 25 and experimental results 19,[26][27][28][29] indicated that the local entitiesshort-range ferromagnetic clusters form in the vicinity of T p . The short-range ferromagnetic clusters can trap charge carriers forming the magnetic polarons.…”