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Magnetic properties are systematically investigated for Cr-doped manganites R1/2Ca1/2(Mn,Cr)O₃ (R=La, Nd, Sm, and Eu) with variation of the averaged ionic radius rR of the rare-earth ion, or the one-electron bandwidth W. Cr-doping procedure on the perovskite B site significantly unstabilizes the charge-ordered (CO) state, and induces the ferromagnetic metallic (FM) state in the large-rR(>~1.29 ) region. We have found coexistence of the CO domains in the FM phase, or the electronic phase separation, near the FM-CO phase boundary.
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Moritomo et al. (1999) studied this question.
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