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공공누리This item is licensed Korea Open Government License

dc.contributor.author
이준희
dc.contributor.author
염민선
dc.date.accessioned
2019-08-28T07:42:05Z
dc.date.available
2019-08-28T07:42:05Z
dc.date.issued
2017-11-22
dc.identifier.issn
2045-2322
dc.identifier.uri
https://repository.kisti.re.kr/handle/10580/14640
dc.identifier.uri
http://www.ndsl.kr/ndsl/search/detail/article/articleSearchResultDetail.do?cn=NART79118147
dc.description.abstract
The topotactic phase transition in SrCoOx (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 SrCoOx is an intriguingly rare candidate for inducing coupled magnetic and electronic transition via fast and reversible redox reactions
dc.language
eng
dc.relation.ispartofseries
SCIENTIFIC REPORTS
dc.title
Strongly Coupled Magnetic and Electronic Transitions in Multivalent Strontium Cobaltites
dc.citation.number
1
dc.citation.startPage
16066
dc.citation.volume
7
dc.subject.keyword
Magnetic Transition
dc.subject.keyword
Electronic Transition
dc.subject.keyword
perovskite SrCoO3
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