Role of the 245 phase in alkaline iron selenide superconductors revealed by high-pressure studies

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dc.citation.articleNumber94514
dc.citation.issueNumber9
dc.citation.journalTitlePhysical Review B
dc.citation.volumeNumber89
dc.contributor.authorGao, Peiwen
dc.contributor.authorYu, Rong
dc.contributor.authorSun, Liling
dc.contributor.authorWang, Hangdong
dc.contributor.authorWang, Zhen
dc.contributor.authorWu, Qi
dc.contributor.authorFang, Minghu
dc.contributor.authorChen, Genfu
dc.contributor.authorGuo, Jing
dc.contributor.authorZhang, Chao
dc.contributor.authorGu, Dachun
dc.contributor.authorTian, Huanfang
dc.contributor.authorLi, Jianqi
dc.contributor.authorLiu, Jing
dc.contributor.authorLi, Yanchun
dc.contributor.authorLi, Xiaodong
dc.contributor.authorJiang, Sheng
dc.contributor.authorYang, Ke
dc.contributor.authorLi, Aiguo
dc.contributor.authorSi, Qimiao
dc.contributor.authorZhao, Zhongxian
dc.date.accessioned2017-06-06T19:07:23Z
dc.date.available2017-06-06T19:07:23Z
dc.date.issued2014
dc.description.abstractThere is considerable interest in uncovering the physics of iron-based superconductivity from the alkaline iron selenides, a materials class containing an insulating phase (245 phase) and a superconducting (SC) phase. Due to the microstructural complexity of these superconductors, the role of the 245 phase in the development of the superconductivity has been a puzzle. Here we demonstrate a comprehensive high-pressure study on the insulating samples with pure 245 phase and biphasic SC samples. We find that the insulating behavior can be completely suppressed by pressure in the insulating samples and also identify an intermediate metallic (M′) state. The Mott insulating (MI) state of the 245 phase and the M′ state coexist over a significant range of pressure up to ∼10 GPa, the same pressure at which the superconductivity of the SC samples vanishes. Our results reveal the M′ state as a pathway that connects the insulating and SC phases of the alkaline iron selenides and indicate that the coexistence and interplay between the MI and M′ states is a necessary condition for superconductivity. Finally, we interpret the M′ state in terms of an orbital selectivity of the correlated 3d electrons.
dc.identifier.citationGao, Peiwen, Yu, Rong, Sun, Liling, et al.. "Role of the 245 phase in alkaline iron selenide superconductors revealed by high-pressure studies." <i>Physical Review B,</i> 89, no. 9 (2014) American Physical Society: https://doi.org/10.1103/PhysRevB.89.094514.
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.89.094514
dc.identifier.urihttps://hdl.handle.net/1911/94815
dc.language.isoeng
dc.publisherAmerican Physical Society
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.titleRole of the 245 phase in alkaline iron selenide superconductors revealed by high-pressure studies
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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