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Electronic and magnetic properties are systematically investigated for doped manganites R₁-ₗSrₗMnO₃ (R=La₁-ₙNdₙ) by changing the nominal hole concentration x and the averaged ionic radius of the perovskite A site (z), or the one-electron bandwidth W. In the heavily doped region (x>~0. 50), we observed a layered-type (A-type) antiferromagnetic state with metallic conductivity (410^-4 at 5 K for La₀. ₄₆Sr₀. ₅₄MnO₃). This observation suggests that the antiferromagnetic metallic (AFM) state is the alternative ground state for doped manganites, besides the ferromagnetic metallic (FM) state.
Akimoto et al. (Sun,) studied this question.