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Role of the 245 phase in alkaline iron selenide superconductors revealed by high-pressure studies
Gao, PW; Yu, R; Sun, LL; Wang, HD; Wang, Z; Wu, Q; Fang, MH; Chen, GF; Guo, J; Zhang, C; Gu, DC; Tian, HF; Li, JQ; Liu, J; Li, YC; Li, XD; Jiang, S; Yang, K; Li, AG; Si, QM; Zhao, ZX;刘景; Li YC(李延春); Li XD(李晓东)
2014
Source PublicationPHYSICAL REVIEW B
ISSN2469-9950
EISSN2469-9969
Volume89Issue:9Pages:94514
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 similar to) state. The Mott insulating (MI) state of the 245 phase and the M' state coexist over a significant range of pressure up to similar 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.
Subject AreaPhysics
DOI10.1103/PhysRevB.89.094514
Indexed BySCI ; ADS
Language英语
WOS IDWOS:000332704400003
ADS Bibcode2014PhRvB..89i4514G
ADS URLhttps://ui.adsabs.harvard.edu/abs/2014PhRvB..89i4514G
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2014PhRvB..89i4514G/citations
Citation statistics
Cited Times:36 [ADS]
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/225255
Collection中国科学院高能物理研究所
Recommended Citation
GB/T 7714
Gao, PW,Yu, R,Sun, LL,et al. Role of the 245 phase in alkaline iron selenide superconductors revealed by high-pressure studies[J]. PHYSICAL REVIEW B,2014,89(9):94514.
APA Gao, PW.,Yu, R.,Sun, LL.,Wang, HD.,Wang, Z.,...&李晓东.(2014).Role of the 245 phase in alkaline iron selenide superconductors revealed by high-pressure studies.PHYSICAL REVIEW B,89(9),94514.
MLA Gao, PW,et al."Role of the 245 phase in alkaline iron selenide superconductors revealed by high-pressure studies".PHYSICAL REVIEW B 89.9(2014):94514.
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