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Title: Ferromagnetism and Charge Order from a Frozen Electron Configuration in Strained Epitaxial LaCoO 3

Abstract

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.

Authors:
 [1];  [2];  [3];  [3];  [1];  [4];  [5];  [1];  [6]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Univ. of Illinois at Chicago, Chicago, IL (United States)
  3. Univ. of California, Riverside, CA (United States)
  4. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  5. Univ. of Illinois at Chicago, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  6. Argonne National Lab. (ANL), Argonne, IL (United States); Dublin City Univ., Dublin (Ireland)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1460556
Alternate Identifier(s):
OSTI ID: 1436388
Grant/Contract Number:  
AC02-06CH11357; FG02-07ER46351
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 120; Journal Issue: 19; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

Sterbinsky, G. E., Nanguneri, R., Ma, J. X., Shi, J., Karapetrova, E., Woicik, J. C., Park, H., Kim, J. -W., and Ryan, P. J. Ferromagnetism and Charge Order from a Frozen Electron Configuration in Strained Epitaxial LaCoO3. United States: N. p., 2018. Web. doi:10.1103/PhysRevLett.120.197201.
Sterbinsky, G. E., Nanguneri, R., Ma, J. X., Shi, J., Karapetrova, E., Woicik, J. C., Park, H., Kim, J. -W., & Ryan, P. J. Ferromagnetism and Charge Order from a Frozen Electron Configuration in Strained Epitaxial LaCoO3. United States. doi:10.1103/PhysRevLett.120.197201.
Sterbinsky, G. E., Nanguneri, R., Ma, J. X., Shi, J., Karapetrova, E., Woicik, J. C., Park, H., Kim, J. -W., and Ryan, P. J. Tue . "Ferromagnetism and Charge Order from a Frozen Electron Configuration in Strained Epitaxial LaCoO3". United States. doi:10.1103/PhysRevLett.120.197201. https://www.osti.gov/servlets/purl/1460556.
@article{osti_1460556,
title = {Ferromagnetism and Charge Order from a Frozen Electron Configuration in Strained Epitaxial LaCoO3},
author = {Sterbinsky, G. E. and Nanguneri, R. and Ma, J. X. and Shi, J. and Karapetrova, E. and Woicik, J. C. and Park, H. and Kim, J. -W. and Ryan, P. J.},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.120.197201},
journal = {Physical Review Letters},
number = 19,
volume = 120,
place = {United States},
year = {2018},
month = {5}
}

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Cited by: 3 works
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Figures / Tables:

FIG. 1 FIG. 1: (a) Schematic rhombohedral bulk LaCoO3 unit cell showing a0 and α0. (b) Schematic energy-level diagrams of Co3+ LS, IS, and HS configurations. (c) Calculated DOS of strained LaCoO3 with ordered HS and LS cobalt. (Inset) Schematic of the Co-O-Co bond showing charge transfer from oxygen to HS andmore » LS cobalt.« less

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