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dc.contributor.authorGao, Peiwen
Yu, Rong
Sun, Liling
Wang, Hangdong
Wang, Zhen
Wu, Qi
Fang, Minghu
Chen, Genfu
Guo, Jing
Zhang, Chao
Gu, Dachun
Tian, Huanfang
Li, Jianqi
Liu, Jing
Li, Yanchun
Li, Xiaodong
Jiang, Sheng
Yang, Ke
Li, Aiguo
Si, Qimiao
Zhao, Zhongxian
dc.date.accessioned 2017-06-06T19:07:23Z
dc.date.available 2017-06-06T19:07:23Z
dc.date.issued 2014
dc.identifier.citation Gao, Peiwen, Yu, Rong, Sun, Liling, et al.. "Role of the 245 phase in alkaline iron selenide superconductors revealed by high-pressure studies." Physical Review B, 89, no. 9 (2014) American Physical Society: https://doi.org/10.1103/PhysRevB.89.094514.
dc.identifier.urihttps://hdl.handle.net/1911/94815
dc.description.abstract There 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.language.iso eng
dc.publisher American Physical Society
dc.rights Article 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.title Role of the 245 phase in alkaline iron selenide superconductors revealed by high-pressure studies
dc.type Journal article
dc.citation.journalTitle Physical Review B
dc.citation.volumeNumber 89
dc.citation.issueNumber 9
dc.type.dcmi Text
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.89.094514
dc.type.publication publisher version
dc.citation.articleNumber 094514


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