Emergence of double-dome superconductivity in ammoniated metal-doped FeSe

	Emergence of double-dome superconductivity in ammoniated metal-doped FeSe
	Izumi, M; Zheng, L; Sakai, Y; Goto, H; Sakata, M; Nakamoto, Y; Nguyen, HLT; Kagayama, T; Shimizu, K; Araki, S
刊名	SCIENTIFIC REPORTS
	2015
卷号	5 页码:9477
英文摘要	The pressure dependence of the superconducting transition temperature (T-c) and unit cell metrics of tetragonal (NH3)(y)Cs0.4FeSe were investigated in high pressures up to 41 GPa. The T-c decreases with increasing pressure up to 13 GPa, which can be clearly correlated with the pressure dependence of c (or FeSe layer spacing). The T-c vs. c plot is compared with those of various (NH3)(y)MxFeSe (M: metal atoms) materials exhibiting different T-c and c, showing that the T-c is universally related to c. This behaviour means that a decrease in two-dimensionality lowers the T-c. No superconductivity was observed down to 4.3 K in (NH3)(y)Cs0.4FeSe at 11 and 13 GPa. Surprisingly, superconductivity re-appeared rapidly above 13 GPa, with the T-c reaching 49 K at 21 GPa. The appearance of a new superconducting phase is not accompanied by a structural transition, as evidenced by pressure-dependent XRD. Furthermore, T-c slowly decreased with increasing pressure above 21 GPa, and at 41 GPa superconductivity disappeared entirely at temperatures above 4.9 K. The observation of a double-dome superconducting phase may provide a hint for pursuing the superconducting coupling-mechanism of ammoniated/non-ammoniated metal-doped FeSe.
学科主题	Science & Technology - Other Topics
类目[WOS]	Multidisciplinary Sciences
收录类别	SCI
WOS记录号	WOS:000352030700001
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/228352]
专题	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Izumi, M,Zheng, L,Sakai, Y,et al. Emergence of double-dome superconductivity in ammoniated metal-doped FeSe[J]. SCIENTIFIC REPORTS,2015,5:9477.
APA	Izumi, M.,Zheng, L.,Sakai, Y.,Goto, H.,Sakata, M.,...&李延春.(2015).Emergence of double-dome superconductivity in ammoniated metal-doped FeSe.SCIENTIFIC REPORTS,5,9477.
MLA	Izumi, M,et al."Emergence of double-dome superconductivity in ammoniated metal-doped FeSe".SCIENTIFIC REPORTS 5(2015):9477.