Magnetic and electrical properties of Ti-substituted lanthanum bismuth manganites

Hopping conduction mechanism and impedance spectroscopy analyses of La0.70Sr0.25Na0.05Mn0.70Ti0.30O3 ceramic

“…The insulator-metal transition is due to the partial doped of the Rare Earth (RE) site by Alkaline Earth (AE) ions, causing the manganese ions to be trained in a combination of Mn 3+ / Mn 4+ ions. It was thought that spin system and magneto-transport characteristics are related by the double exchange interaction caused by the motion of the eg electrons for Mn 3+ / Mn 4+ ions [11][12][13][14]. The mixed valence state of manganese (Mn 3+ /Mn 4+ ) of these compounds displays the prominent role to alternate.…”

Study of transport, magnetic and magnetocaloric properties in Sr2+ substituted praseodymium manganite

“…Perovskite manganites having common formula R 1−x A x MnO 3 where 'R' is a rare-earth cation (La 3+ , Pr 3+ , Y 3+ , Nd 3+ etc ) and 'A' an alkali or alkaline earth cation (Ca 2+ , Sr 2+ , Ba 2+ , Na + , K + , etc ) show a lot of interesting properties, arising from the strong interplay between spin, charge, orbital and lattice degrees of freedom [1][2][3][4][5][6][7][8][9]. Colossal magnetoresistance (CMR) phenomena observed in these manganites has been mainly explained through double exchange mechanism [10], phase separation [11] and spin-polarized tunnelling effect [12].…”