The magnetization and magnetoresistance of Ln1-xBaxMnO3 have been studied for a single crystal (Ln = Nd, x = 0.23) and for ceramics (Ln = Nd, Sm; 0 x0.44). It was shown that Nd1-xBaxMnO3 compositions in the range 0 x0.05 are inhomogeneous antiferromagnets; a mixed antiferro-ferromagnet state appears in the range 0.05 0.12. Both Nd and Sm sublattices are coupled antiferromagnetically with manganese ions. All the ferromagnetic Nd1-xBaxMnO3 samples show similar magnetotransport properties despite of a strong difference in the resistivity behaviour. Our results could be understood in terms of Mn-O-Mn superexchange and 3d orbital ordering as well as variation of band structure due to the ionic size effect, Mn4+ ion appearance and magnetic ordering. It is supposed that the gap between the narrow 3d manganese band and wide 2p oxygen band decreases strongly below TC.
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Troyanchuk et al. (1999) studied this question.
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