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

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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
刊名	PHYSICAL REVIEW B
	2014
卷号	89 期号:9
ISSN号	1098-0121
通讯作者	Sun, LL (reprint author), Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China.
中文摘要	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 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.
资助信息	NSCF [91321207, 10974175, 11204059]; 973 projects [2011CBA00100, 2010CB923000]; Chinese Academy of Sciences; Robert A. Welch Foundation [C-1411]; NSF [DMR-1309531]
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59557]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 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).
APA	Gao, PW.,Yu, R.,Sun, LL.,Wang, HD.,Wang, Z.,...&Zhao, ZX.(2014).Role of the 245 phase in alkaline iron selenide superconductors revealed by high-pressure studies.PHYSICAL REVIEW B,89(9).
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).