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Strongly Coupled Magnetic and Electronic Transitions in Multivalent Strontium Cobaltites.

Abstract：

: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.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Lee JH,Choi WS,Jeen H,Lee HJ,Seo JH,Nam J,Yeom MS,Lee HN

doi

10.1038/s41598-017-16246-z

subject

Has Abstract

pub_date

2017-11-22 00:00:00

pages

16066

issue

1

issn

2045-2322

pii

10.1038/s41598-017-16246-z

journal_volume

7

pub_type

杂志文章

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