Observation of selective surface element substitution in FeTe0.5Se0.5 superconductor thin film exposed to ambient air by synchrotron radiation spectroscopy
Zhang N(张念); Liu C(刘晨); Zhao JL(赵佳丽); Lei T(雷涛); Wang JO(王嘉鸥); Qian HJ(钱海杰); Wu R(吴蕊); Kui RX(奎热西); Zhang, N; Liu, C; Zhao, JL; Lei, T; Wang, JO; Qian, HJ; Wu, R; Yan, L; Guo, HZ; Ibrahim, K
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
DOI10.1088/1674-1056/25/9/097402
通讯作者奎热西
文章类型期刊论文
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.
类目[WOS]Physics, Multidisciplinary
关键词[WOS]X-RAY-ABSORPTION ; PHASE-DIAGRAM ; IRON ; FE ; CRYSTAL ; SPECTRA ; XPS
语种英语
WOS记录号WOS:000384226500081
引用统计
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/260334
专题中国科学院高能物理研究所_多学科研究中心_期刊论文
中国科学院高能物理研究所_多学科研究中心
作者单位中国科学院高能物理研究所
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GB/T 7714
Zhang N,Liu C,Zhao JL,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 张念.,刘晨.,赵佳丽.,雷涛.,王嘉鸥.,...&Ibrahim, K.(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 张念,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).
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