Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 13, Issue 48, Pages 11001-11007Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/13/48/324
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Evidence for an unusual double charge disproportionation, Mn4+ + Co2+ --> Mn3+ + Co3+ --> Mn4+ + Co2+, is observed in nanocrystalline LaMn0.5Co0.5O3 synthesized by a low-temperature method and annealed in the temperature range 200-1300 degreesC. The Curie temperature of nanocrystalline LaMn0.5Co0.5O3 is increased from 150 to 230 K when annealed in the temperature range 200-700 degreesC and is further decreased back to 150 K when annealed in the temperature range 700-1300 degreesC. This increase and decrease in T-c is found to be associated with the conversion of the spin states of Mn and Co from Mn4+ and Co2+ to Mn3+ and low-spin Co3+, and again back to Mn4+ and Co2+ as evidenced from x-ray photoelectron spectroscopic studies.
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