Abstract
Core-level Mn and Co 2p x-ray photoelectron spectroscopic studiesgive evidence for different spin states of Mn and Co in the twodifferent phases of the ferromagnetic compoundLaMn0.5Co0.5O3. Ferromagnetism in the high-Tc (Tc≈230 K) phase of the compound arises fromMn3+-O-Mn3+ superexchange interactions, whereas in thelow-Tc (Tc≈150 K) phase Mn4+-O-Co2+superexchange interactions are responsible for the ferromagnetism.
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