Abstract
The A-cation-ordered manganites are obtained using two-step synthesis. Their chemical composition, crystal structure, magnetic and magnetotransport properties are investigated. It is revealed that the physical properties of the A-cation-ordered manganites are considerably distinguished from ones of the A-cation-disordered and strongly depend on the ordering degree of cations and . So, A-cation-disordered sample is characterized by cubic () unit cell, while the A-cation-ordered one is characterized by tetragonal () cell. The cation states in this system are reversible. The cation-ordered state is stable after the thermal treatment in air up to 1300 0C. The cation ordring leads to considerable increase of the critical phase transition temperatures. So, the sample with maximum ordering degree is “metal” below TMI ~ 311 K, while for the completely disordered one TMI reaches ~ 137 K. Slightly below TMI all the samples display the magnetoresistance peak, which is ~ 10 % and ~ 65 % in field of 9 кOe for the completely ordered and disordered samples, respectively. This important feature, magnetoresistance peak at the room temperatures, determined the potential practical significance of the A-cation-ordered manganites PrBaMn2O6. The obtained magnetic materials may be used for the elaboration of magnetic field sensors as well as in devices of information storage.
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