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Title: Strongly Coupled Magnetic and Electronic Transitions in Multivalent Strontium Cobaltites

Here, the topotactic phase transition in SrCoO x (x = 2.5–3.0) makes it possible to reversibly transit between the two distinct phases, i.e. the brownmillerite SrCoO 2.5 that is a room-temperature antiferromagnetic insulator (AFM-I) and the perovskite SrCoO 3 that is a ferromagnetic metal (FM-M), owing to their multiple valence states. For the intermediate x values, the two distinct phases are expected to strongly compete with each other. With oxidation of SrCoO 2.5, however, it has been conjectured that the magnetic transition is decoupled to the electronic phase transition, i.e., the AFM-to-FM transition occurs before the insulator-to-metal transition (IMT), which is still controversial. Here, we bridge the gap between the two-phase transitions by density-functional theory calculations combined with optical spectroscopy. We confirm that the IMT actually occurs concomitantly with the FM transition near the oxygen content x = 2.75. Strong charge-spin coupling drives the concurrent IMT and AFM-to-FM transition, which fosters the near room-T magnetic transition characteristic. Ultimately, our study demonstrates that SrCoO x is an intriguingly rare candidate for inducing coupled magnetic and electronic transition via fast and reversible redox reactions.
Authors:
 [1] ;  [2] ; ORCiD logo [3] ;  [1] ;  [1] ;  [1] ;  [4] ; ORCiD logo [5]
  1. Ulsan National Institute of Science & Technology (UNIST), Ulsan (Republic of Korea)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Sungkyunkwan Univ., Suwon (Korea)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Pusan National Univ., Busan (Korea)
  4. Korea Institute of Science and Technology Information (KISTI), Daejeon (Republic of Korea)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1414724

Lee, J. H., Choi, Woo Seok, Jeen, H., Lee, H. -J., Seo, J. H., Nam, J., Yeom, M. S., and Lee, H. N.. Strongly Coupled Magnetic and Electronic Transitions in Multivalent Strontium Cobaltites. United States: N. p., Web. doi:10.1038/s41598-017-16246-z.
Lee, J. H., Choi, Woo Seok, Jeen, H., Lee, H. -J., Seo, J. H., Nam, J., Yeom, M. S., & Lee, H. N.. Strongly Coupled Magnetic and Electronic Transitions in Multivalent Strontium Cobaltites. United States. doi:10.1038/s41598-017-16246-z.
Lee, J. H., Choi, Woo Seok, Jeen, H., Lee, H. -J., Seo, J. H., Nam, J., Yeom, M. S., and Lee, H. N.. 2017. "Strongly Coupled Magnetic and Electronic Transitions in Multivalent Strontium Cobaltites". United States. doi:10.1038/s41598-017-16246-z. https://www.osti.gov/servlets/purl/1414724.
@article{osti_1414724,
title = {Strongly Coupled Magnetic and Electronic Transitions in Multivalent Strontium Cobaltites},
author = {Lee, J. H. and Choi, Woo Seok and Jeen, H. and Lee, H. -J. and Seo, J. H. and Nam, J. and Yeom, M. S. and Lee, H. N.},
abstractNote = {Here, the topotactic phase transition in SrCoO x (x = 2.5–3.0) makes it possible to reversibly transit between the two distinct phases, i.e. the brownmillerite SrCoO2.5 that is a room-temperature antiferromagnetic insulator (AFM-I) and the perovskite SrCoO3 that is a ferromagnetic metal (FM-M), owing to their multiple valence states. For the intermediate x values, the two distinct phases are expected to strongly compete with each other. With oxidation of SrCoO2.5, however, it has been conjectured that the magnetic transition is decoupled to the electronic phase transition, i.e., the AFM-to-FM transition occurs before the insulator-to-metal transition (IMT), which is still controversial. Here, we bridge the gap between the two-phase transitions by density-functional theory calculations combined with optical spectroscopy. We confirm that the IMT actually occurs concomitantly with the FM transition near the oxygen content x = 2.75. Strong charge-spin coupling drives the concurrent IMT and AFM-to-FM transition, which fosters the near room-T magnetic transition characteristic. Ultimately, our study demonstrates that SrCoO x is an intriguingly rare candidate for inducing coupled magnetic and electronic transition via fast and reversible redox reactions.},
doi = {10.1038/s41598-017-16246-z},
journal = {Scientific Reports},
number = 1,
volume = 7,
place = {United States},
year = {2017},
month = {11}
}

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