Polycrystalline isotropic perovskite-like La5/6AM1/6MnO3 (AM=Na, K, Rb, Cs) partially substituted trivalent La3+ for monovalent cations were fabricated by conventional ceramics techniques and their magnetoresistance effects in addition to magnetic/electrical properties were studied. The all studied samples show magnetization as large as about 100-110 μWb-m-kg-1 at 77 K and high electrical conductivity of 10-3 Ω-m order at 300 K. At room temperature polycrystalline isotropic La5/6K1/6MnO3 shows large negative magnetoresistance effect Δp/ρ0= -20 % when magnetic field of 1. 5 T is applied. This value is larger than the previously reported values for La1-xMexMnO3 (Me=divalent cations) polycrystalline ceramics.
- Magnetoresistance effect
- Monovalent cation
- Perovskile structure
- Polycrystalline isotropic ceramics