Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 10, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3098374
Keywords
crystal field interactions; excited states; excitons; g-factor; lanthanum compounds; Schottky defects; specific heat; spin dynamics; spin-orbit interactions
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Funding
- DoE [DE-FG02-06ER46275, DE-AC02-06CH11357]
- NSF [DMR-0804432, DMR02-13706]
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Measurement of the low temperature specific heat of LaCoO3 single crystals reveals a previously unobserved Schottky anomaly with an energy level splitting, 0.5 meV, that is associated with the first excited spin state of the Co3+ ion. These states persist well below 2 K and have a g-factor around 3.5, consistent with the high-spin spin-orbit triplet, implying the existence of a low density (approximately 0.1% of the sites) of finite-spin Co ions even in the T=0 limit. We propose that these states are trapped at defects and are consistent with the magnetic excitons observed in earlier work.
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