Observation of low field magnetoresistance in the layered manganite Sr1.6Sm1.4Mn2O7

The formation of the complex manganites LnSr2Mn2O7 (Ln=La, Nd, Gd)

“…1) are of significant interest due to the effect of colossal magnetoresistance. The properties of these compounds were studied intensively [1][2][3][4][5][6][7] but some issues remain unexplained. For example, structural investigations [8,9] had shown that some compounds were formed not as a single phase but as a mixture of two phases possessing a slightly different Ln:Sr ratio.…”

Metal-Insulator Transition Induced by Short Range Magnetic Ordering in Mono-layered Manganite

“…Similar behavior in the ρ(T) curves has been observed in the bi-layered manganites with magnetic rare earth elements Ln1.4Sr1.6Mn2O7 (Ln = Pr, Nd, Sm). [21][22][23] In order to elucidate the nature of the transport property of La 0.7 Sr 1.3 MnO 4+δ further, we have investigated the isothermal MR at various temperatures as a function of applied fields. As shown in Figure 5(b), the shape of the MR curves defined as {ρ H − ρ 0 }/ρ 0 is slightly different from below and above T MI ≈ 160 K. The MR decreases almost linearly with H at 190 K but exponentially at 5 K as reported in other CMR materials.…”

Ruddlesden–Popper Oxide (La0.6Sr0.4)2(Co,Fe)O4 with Exsolved CoFe Nanoparticles for a Solid Oxide Fuel Cell Anode Catalyst

“…[21][22][23][24] However, the high calcination temperatures above 1300 C and difficulty involved in the synthesis process are major hurdles in using this structure for SOFC or solid oxide electrolysis cell (SOEC) electrodes. [25,26] To obtain this structure at low temperatures, a recently proposed method is to reduce the perovskite derivatives at temperatures near 800 C, resulting in the formation of the Ruddlesden-Popper structure along with in situ grown metallic-phase nanoparticles. [15,17,[27][28][29][30] This strategy ensures that particle growth of the Ruddlesden-Popper support, which leads to a decrease in reaction sites, is suppressed due to the relatively low preparation temperature.…”