Abstract
The crystal structure and magnetotransport properties of the Nd0.70Ba0.30-MnO3.00−δ manganites have been investigated. The stoichiometric A-site ionic disordered Nd0.70Ba0.30MnO3.00 sample is orthorhombic (SG=Imma) ferromagnet below T C ≈151 K. It has metal-insulator transition at T MI ≈140 K and peak of magnetoresistance ∼50% in field of 9 kOe. The anion-deficient partly A-site ionic ordered Nd0.70Ba0.30MnO2.60 sample is ferrimagnet with T N ≈130 K and has nanometric ∼440 nm grains. The oxygen annealed stoichiometric partly A-site ordered Nd0.70Ba0.30MnO3.00 sample consists of two perovskite phases: (i) A-site ionic completely ordered tetragonal (SG=P4/mmm) NdBaMn2.00O6.00 with a Curie point of ∼310 K and (ii) superstoichiometric orthorhombic (SG=Pnma) NdMnO3.00+γ with a Curie point of ∼120 K. The magnetoresistance of this sample at the room temperature is about 7% in a field of 9 kOe. Considerable changes of the magnetic properties are interpreted as due to the ordering of Nd3+ and Ba2+ cations as well as the formation of nanometric grains.
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Trukhanov, S.V., Trukhanov, A.V., Szymczak, H. et al. Magnetotransport Properties and Mechanism of the A-Site Ordering in the Nd–Ba Optimal-Doped Manganites. J Low Temp Phys 149, 185–199 (2007). https://doi.org/10.1007/s10909-007-9507-6
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DOI: https://doi.org/10.1007/s10909-007-9507-6