The discovery of novel structural and physical properties in the A-site ordered manganite RBaMn₂O₆ (R = Y and rare earth elements) has demanded new comprehension about perovskite manganese oxides. In the present study, the A-site disordered form, R0.5Ba0.5MnO₃, has been investigated and compared with both RBaMn₂O₆ and R0.5A0.5MnO₃ (A: Sr, Ca) in the structures and electromagnetic properties. R0.5Ba0.5MnO₃ has a primitive cubic perovskite cell in the structure and magnetic glassy states are dominant as its ground state, in contrast to the ordinary disordered R0.5A0.5MnO₃ (A: Sr, Ca). In Pr-compounds with various degrees of Pr/Ba randomness at the A-sites, the A-site disorder gradually suppresses both ferromagnetic and A-type antiferromagnetic transitions and finally leads to a magnetic glassy state in Pr0.5Ba0.5MnO₃. A peculiar behavior, multi-step magnetization and resistivity change, has been observed in Pr0.5Ba0.5MnO₃. These properties could be closely related to any spatial heterogeneity caused by the random distribution of Ba2 + and R3 + with much different ionic radius.
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Nakajima et al. (2004) studied this question.
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