The orbital-charge-spin ordering phase diagram for half-doped perovskites Ln1/2Ba1/2MnO₃ (Ln $=$ rare earth) with ordered Ln/Ba cations has been investigated comparatively with that of the Ln/Ba solid-solution analogs. A large modification of the phase diagram is observed upon the A-site disordering near the original bicritical point between the charge-orbital ordering and ferromagnetic metallic phases. The random potential by quenched disorder inherent in the A-site solid solution is found to suppress the respective long-range orders and gives rise to the colossal magnetoresistive state.
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Akahoshi et al. (2003) studied this question.
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