Abstract
The A-site-ordered/disordered manganese perovskites,RBaMn2O6/ R0.5Ba0.5MnO3 (R = Y and rare earthelements), are reviewed. RBaMn2O6 displays remarkable features: (1) the charge/orbital order (CO) transitionat relatively high temperatures far above 300 K, (2) a new stackingvariation of the CE-type CO with a fourfold periodicity along thec-axis, (3) the presence of structural transition possibly accompanied bydx2−y2 orbital order and (4) electronic phase segregation. These novel structural andelectromagnetic properties are discussed in terms of the structural characteristic that theMnO2 square sublattice is sandwiched by two types of rock-salt layer,R O and BaO, with different lattice sizes. Such structure introduces a strong frustration to theMnO2 sublattice and gives a new perturbation to the competition of multipledegrees of freedom among charge, orbital, spin and lattice. InR0.5Ba0.5MnO3 with a primitive cubic perovskite cell, on the other hand, the magnetic glassystates are dominant as the ground state. A peculiar behaviour, steplikeultrasharp magnetization and resistivity changes, has been observed inPr0.5Ba0.5MnO3.
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