Magneto-transport properties of Fe-doped LSMO manganites

Electrical transport and giant magnetoresistance in La0.75Sr0.25Mn1−xCrxO3 (0.15, 0.20 and 0.25) manganite oxide

“…The extrinsic CMR, which is related to the grain boundaries, can be explained by spin polarized tunneling [4]. According to Hund's rule, this charge transfer induces a ferromagnetic coupling between Mn 3+ and Mn 4+ ions which in turn has a dramatic effect on the electrical conductivity [6,7]. But within a layer, these Mn 3+ ions are coupled ferromagnetically.…”

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

“…The holes permit charge transfer in the e g state which is highly hybridized with the oxygen 2p state. Due to the intra-atomic Hund's rule, this charge transfer induces a ferromagnetic coupling between Mn 3+ and Mn 4+ ions which in turn has a dramatic effect on the electrical conductivity [6][7][8][9]. 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.…”

Large magnetocaloric effect and critical behavior in La0.7Ba0.2Ca0.1Mn1−xAlxO3

“…However, within a layer, these Mn 3+ ions are coupled ferromagnetically. When the Tr trivalent element is doped by various elements, a proportionate amount of Mn 3+ with the electronic conguration (3d 4 , t 3 2g [ e 1 g [, S ¼ 2), is replaced by Mn 4+ with the electronic conguration (3d 3 , t 3 2g [ e 0 g , S ¼ 3/2) creating holes in the e g band. 3 The holes permit charge transfer in the e g state which is highly hybridized with the oxygen 2p state.…”