Journal
PHYSICAL REVIEW B
Volume 81, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.092402
Keywords
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Funding
- DOE [DE-FG02-99ER45790, DE-FG02-07ER46832]
- NSF [NSF-NIRT-ECS-0608842]
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Ca3Co2-xMnxO6 (x similar to 0.96) is a multiferroic with spin-chains of alternating Co2+ and Mn4+ ions. The spin state of Co2+ remains unresolved due to a discrepancy between high-temperature x-ray absorption (S=3/2) and low-temperature neutron (S=1/2) measurements. Using a combination of magnetic modeling and crystal-field analysis, we show that the existing low temperature data cannot be reconciled within a high spin scenario by invoking spin-orbit or Jahn-Teller distortions. To unify the experimental results, we propose a spin-state crossover with specific experimental predictions.
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