The origin of ferromagnetism in the two different phases of LaMn0.5Co0.5O3: evidence from x-ray photoelectron spectroscopic studies

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, , Citation V L Joseph Joly et al 2001 J. Phys.: Condens. Matter 13 649 DOI 10.1088/0953-8984/13/4/311

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1 Physical and Materials Chemistry Division, National Chemical Laboratory, Pune 411008, India

2 Catalysis Division, National Chemical Laboratory, Pune 411008, India

3 Author to whom any correspondence should be addressed.

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  1. Received 11 August 2000

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Abstract

Core-level Mn and Co 2p x-ray photoelectron spectroscopic studies give evidence for different spin states of Mn and Co in the two different phases of the ferromagnetic compound LaMn0.5Co0.5O3. Ferromagnetism in the high-Tc (Tc≈230 K) phase of the compound arises from Mn3+-O-Mn3+ superexchange interactions, whereas in the low-Tc (Tc≈150 K) phase Mn4+-O-Co2+ superexchange interactions are responsible for the ferromagnetism.

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10.1088/0953-8984/13/4/311