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Structural phase‐transition studies employing low‐temperature transmission electron microscopy and low‐temperature X‐ray diffraction have been carried out on nearly stoichiometric ( δ  = 0.01) and on off‐stoichiometric ( δ  = 0.12) versions of La 0.2 Sr 0.8 MnO 3− δ   manganite. The nearly stoichiometric La 0.2 Sr 0.8 MnO 3− δ   undergoes a cubic to Jahn–Teller distorted C‐type antiferromagnetic tetragonal phase transition at 260 K. For off‐stoichiometric La 0.2 Sr 0.8 MnO 3− δ   the Jahn–Teller distorted tetragonal phase transition is totally suppressed and the basic perovskite lattice remains cubic but shows a charge‐ordered phase. Stabilization of charge‐ordered phase in the absence of cooperative Jahn–Teller distortion has been attributed to Coulomb repulsion and Hunds coupling energy. The off‐stoichiometric sample shows characteristically different physical properties. This has been realized through transport, magnetic, and calorimetric measurements. A smooth crossover from variable‐range hopping transport to a power‐law dependence of resistivity ( ρ ) on temperature ( T ), i.e.,  ρ  =  CT  − α   has been realized. This has been attributed to multistep inelastic tunneling through channels involving localized states around oxygen vacancy sites.

Oxygen‐deficiency‐induced suppression of JT distortion and stabilization of charge ordering in La 0.2 Sr 0.8 MnO 3− δ