Abstract
Powder samples of the ABO3 perovskite manganites Pr0.6Sr0.4CrxMn1-xO3 (0.00≤x≤0.30) were synthesized using the sol-gel method. X-ray diffraction analyses showed that all the samples had a single-phase orthorhombic structure. By analyzing magnetic parameters on the basis of the O2p itinerant electron model, we found that there are two magnetic transition temperatures, TCM and TCP, corresponding to changes in the magnetic ordering for the Mn and Pr cations, respectively. The magnetic moments of Mn3+ and Cr3+ cations within the B sublattice show canted ferromagnetic coupling, and the magnetic moments of the Pr cations within the A sublattice also show canted ferromagnetic coupling. However, the total magnetic moment of the A sublattice shows antiferromagnetic coupling against that of the B sublattice. The assumption of the canted ferromagnetic coupling within the B sublattice was confirmed using magnetoresistance experimental results.
Highlights
All O ions are assumed to be O2, and the magnetic properties and electronic transport properties of Ln1-xT xMnO3 are correlated via the super-exchange (SE) interaction along the Mn3+-O2--Mn3+ ionic chain and the double exchange (DE) interaction along the Mn3+-O2--Mn4+ ionic chain.[2,3,4,5,6,7,8,9,10,11,12,13]
There have been conflicting reasons given in previous reports for this decrease as well as for the magnetic moment directions of the Pr and Mn cations in Pr1-xT xMnO3
We found that there are O1anions at the surface and within the bulk, though the concentration of O1- anions may be different between the surface and inside
Summary
All O ions are assumed to be O2-, and the magnetic properties and electronic transport properties of Ln1-xT xMnO3 are correlated via the super-exchange (SE) interaction along the Mn3+-O2--Mn3+ ionic chain and the double exchange (DE) interaction along the Mn3+-O2--Mn4+ ionic chain.[2,3,4,5,6,7,8,9,10,11,12,13]. There have been conflicting reasons given in previous reports for this decrease as well as for the magnetic moment directions of the Pr and Mn cations in Pr1-xT xMnO3. Jirak et al.[16] prepared a polycrystalline sample of Pr0.6Ca0.4MnO3, and claimed that the magnetic moment direction of the Pr3+ cations was parallel to that of the Mn cations. Boujelben et al.[17] likewise prepared Pr0.6Sr0.4MnO3 powder using a
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