Effects of Ag addition on electrical transport and magnetic properties of La0.67Ba0.33Mn0.88Cr0.12O3

Transport properties of silver–calcium doped lanthanum manganite

“…Also, the segregation of silver on the grain surface or grain boundaries increases the atomic structure disorder. This reduces or suppresses the barriers encountered by carriers and leads to a reduction of electron scattering and an enhancement of crossing by tunneling [25,26]. These factors cause the decrease of resistivity with increasing Ag content.…”

Magneto-transport and magnetization studies of Pr2/3Ba1/3MnO3:Ag2O composite manganites

“…In order to get clear knowledge of MR due to the grain boundary effects researchers have synthesized composite systems with some additives. This has been achieved by making the grain boundary insulating (thus creating a barrier in the way of the charge carriers) [6][7][8][9][10][11] or by making it conducting [12][13][14][15][16][17]. Besides this, hard and soft magnetic materials have also been added to the parent perovskite manganites [18,19].…”

“…Such a problem of increase in resistivity can be sorted out if manganite composites with appropriate metallic additives are synthesized. Addition of Ag through Ag 2 O, AgNO 3 etc has revealed drastic changes in the composite material properties [13][14][15][16][17]. The scenario bears similarity to high-temperature superconductors where enhanced grain boundary properties like the improvement in the critical current density and in the conduction noise are observed with Ag addition [20].…”

Effect of Ag doping on structural, magnetic and magnetocaloric properties of La0.65Ca0.35−xAgxMnO3 manganites

“…They argued that the T C enhancement induced by Ag doping may be related to the suppression of magnetic scattering at grain boundaries which improve the connection between different ferromagnetic domains. We note that the T C remains almost constant in the rhombohedral phase (for x = 0.15 and 0.2) indicating a limited solubility of Ag + in the perovskite phase [24][25][26].…”