Double metal–insulator peaks and effect of Sm3+ substitution on magnetic and transport properties of hole-doped La0.85Ag0.15MnO3

Effects of non magnetic aluminum Al doping on the structural, magnetic and transport properties in La0.57Nd0.1Sr0.33MnO3 manganite oxide

“…This double-exchange (DE) model originally proposed by Zener [10] has been the most prominent underlying physics that describes the simultaneous occurrence of transition from paramagnetic insulator to ferromagnetic metal for most hole-doped manganites. However, with more and more experimental observations, numerous physical mechanisms, including the electron-electron scattering, the small polaron and magnon correlated transport [7,11,12], the lattice distortion effect [13] and the phase-separation-based percolation [12,14], have been proposed to give a more quantitative account on the experimental results obtained from various manganite systems. Nevertheless, there are several ways to change the above-mentioned properties of the manganites.…”

Magnetocaloric Effect in Perovskite Manganite La0.65Nd0.05Ba0.3MnO3 with Double Metal–Insulator Peaks

“…This presumption was verified by the results of susceptibility measurements where the slope of the normalized χ is plotted as a function of temperature [12]. It is possible that the existence of antiferromagnetic clusters gives rise to the disconnectivity of the ferromagnetic phase contributing to T p2 peak.…”

“…Mazahari and Akhavan [17] suggested that the secondary T p2 peak observed in (La 1−y K y ) 0.7 Ca 0.3 MnO 3 is related to the large difference in the valence states and ionic radii of La, Ca and K ions. Ibrahim suggested that the secondary T p2 peak observed in La 0.85−x Sm x Ag 0.15 MnO 3 might orig- inate from the existence of mixed ferromagnetic and antiferromagnetic phases due to the increase of magnetic inhomogeneity as a result of double-exchange interaction [12].…”

“…Since the double metal-insulator peaks of resistivity were just discovered recently and this kind of peculiar phenomenon is considered as an open question, more correlative researches should be carried out [12]. The interest of our study presented in this paper is to search for the possible broad and large refrigerant capacity of magnetocaloric effect in the manganese perovskite at low magnetic fields and in the vicinity of room temperature, which is definitely important and timely.…”

Infrared emissivity of Sr doped lanthanum manganites in coating form

“…It has been reported that doped manganites at certain doping levels undergo metal-insulator (MI) phase transition [11][12][13], and even two MI transition peaks were observed in several doped manganites [14]. The above mentioned phenomenon has been explained by means of double-exchange interaction between Mn 3+ and Mn 4+ , and electron-phonon interaction relating to Jahn-Tellertype lattice distortion of the MnO 6 octahedra [15][16][17].…”