Observation of selective surface element substitution in FeTe0.5Se0.5 superconductor thin film exposed to ambient air by synchrotron radiation spectroscopy

doi:10.1088/1674-1056/25/9/097402

	Observation of selective surface element substitution in FeTe0.5Se0.5 superconductor thin film exposed to ambient air by synchrotron radiation spectroscopy
	Kui RX(奎热西); Ibrahim, K; Guo, HZ; Yan, L; Wu, R; Qian, HJ; Wang, JO; Lei, T; Zhao, JL; Liu, C
刊名	CHINESE PHYSICS B
	2016
卷号	25 期号:9
关键词	11 iron-based superconductor oxidation mechanism in ambient air selective surface element substitution synchrotron radiation spectroscopy
DOI	10.1088/1674-1056/25/9/097402
通讯作者	奎热西
英文摘要	A systematic investigation of oxidation on a superconductive FeTe0.5Se0.5 thin film, which was grown on Nb-doped SrTiO3 (001) by pulsed laser deposition, has been carried out. The sample was exposed to ambient air for one month for oxidation. Macroscopically, the exposed specimen lost its superconductivity due to oxidation. The specimen was subjected to in situ synchrotron radiation photoelectron spectroscopy (PES) and x-ray absorption spectroscopy (XAS) measurements following cycles of annealing and argon ion etching treatments to unravel what happened in the electronic structure and composition after exposure to air. By the spectroscopic measurements, we found that the as-grown FeTe0.5Se0.5 superconductive thin film experienced an element selective substitution reaction. The oxidation preferentially proceeds through pumping out the Te and forming Fe-O bonds by O substitution of Te. In addition, our results certify that in situ vacuum annealing and low-energy argon ion etching methods combined with spectroscopy are suitable for depth element and valence analysis of layered structure superconductor materials.
语种	英语
WOS记录号	WOS:000384226500081
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/260334]
专题	高能物理研究所_多学科研究中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Kui RX,Ibrahim, K,Guo, HZ,et al. Observation of selective surface element substitution in FeTe0.5Se0.5 superconductor thin film exposed to ambient air by synchrotron radiation spectroscopy[J]. CHINESE PHYSICS B,2016,25(9).
APA	奎热西.,Ibrahim, K.,Guo, HZ.,Yan, L.,Wu, R.,...&张念.(2016).Observation of selective surface element substitution in FeTe0.5Se0.5 superconductor thin film exposed to ambient air by synchrotron radiation spectroscopy.CHINESE PHYSICS B,25(9).
MLA	奎热西,et al."Observation of selective surface element substitution in FeTe0.5Se0.5 superconductor thin film exposed to ambient air by synchrotron radiation spectroscopy".CHINESE PHYSICS B 25.9(2016).