Journal of Applied Physics · 1968 · 264 citations · 4 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsMagnetic MaterialsSolid State PhysicsCrystallographyElectronic Band StructureFerromagnetic MaterialsFerromagnetismMagnetic Properties Of SolidsPhase TransitionsCrystallographic Phase TransitionsElectron-electron InteractionsFerromagnetic Phase TransitionsHigh-spin StatesMagnetic PerovskitesOxide PerovskitesPerovskite Crystal StructureStrontium Barium Titanate
Crystallographic, magnetic, and electrical studies of the system La1−xSrxCoO3.00±0.01 for 0≤x≤0.5 give indirect evidence for the presence of chemical inhomogeneities separating strontium-free regions, where localized ``3d'' electrons occur at thermally excited high-spin Co3+ ions, from strontium-rich regions, where the ``3d'' electrons are collective and give ferromagnetism at low temperatures. These different regions occur within the same rhombohedral perovskite crystal and appear to represent two different electronic phases within the same crystallographic phase. A schematic band model for the ferromagnetic phase is presented.
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