Abstract
The x-dependences of the Curie temperature TC and magnetotransport properties have been studied in La1−xBaxMnO3 (0 ≤ x ≤ 0.5) single crystals prepared by the floating zone method. The crystal structures are orthorhombic (Pbnm) for 0 ≤ x ≤ 0.1, rhombohedral (\(R\bar{3}c\)) for 0.15 ≤ x < 0.45, and cubic (\(Pm\bar{3}m\)) for 0.45 ≤ x ≤ 0.5. For x ≥ 0.25, metallic ferromagnetism is dominant and TC increases to 361 K at x = 0.5, which is in good agreement with the theoretically calculated results. The magnetization dependence of resistivity is also well approximated using the theory based on the double exchange model. It is concluded that the evolutions of TC and magnetotransport properties with x for La1−xBaxMnO3 single crystals can be fundamentally interpreted using the theory based on the double exchange (DE) model in the strong coupling limit.
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