Preparation and Magnetic Properties of LaMnO₃₊δ (0≤ δ ≤0.154) = 0-0.154) are investigated. It is found that, in a weak magnetic field (
B = 2 G), the LaMnO₃₊δ
Variable-range hopping conductivity of La₁₋xSrxMn₁₋yFeyO₃) is investigated between temperaturesT∼5 and 310 K in magnetic fields
B up to 8 T