Ferromagnetism and Charge Order from a Frozen Electron Configuration in Strained Epitaxial LaCoO3

Here, we report ordering of the cobalt electron configuration in ferromagnetic strained epitaxial LaCoO3. Specifically, the presence of charge order is demonstrated from distinct features of the resonant cobalt contribution to superstructure reflections. Density functional theory calculations show t...

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Bibliographic Details
Published in:Physical review letters 2018-05, Vol.120 (19)
Main Authors: Sterbinsky, G. E., Nanguneri, R., Ma, J. X., Shi, J., Karapetrova, E., Woicik, J. C., Park, H., Kim, J. -W., Ryan, P. J.
Format: Article
Language:English
Subjects:
ATOMIC AND MOLECULAR PHYSICS
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Summary:Here, we report ordering of the cobalt electron configuration in ferromagnetic strained epitaxial LaCoO3. Specifically, the presence of charge order is demonstrated from distinct features of the resonant cobalt contribution to superstructure reflections. Density functional theory calculations show that the observed order is consistent with the spin-state periodicity predicted to give rise to ferromagnetism in LaCoO3. Through the modification of symmetry by strain, concurrent frozen charge and spin-state order are stabilized, giving rise to long-range magnetic order.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.120.197201