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Chin. Phys. B, 2016, Vol. 25(9): 097402    DOI: 10.1088/1674-1056/25/9/097402
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

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

Nian Zhang(张念)1,2, Chen Liu(刘晨)1, Jia-Li Zhao(赵佳丽)1, Tao Lei(雷涛)1, Jia-Ou Wang(王嘉鸥)1, Hai-Jie Qian(钱海杰)1, Rui Wu(吴蕊)1, Lei Yan(颜雷)3, Hai-Zhong Guo(郭海中)3, Kurash Ibrahim(奎热西)1
1. Institute of High Energy of Physics, Chinese Academy of Sciences, Beijing 100049, China;
2. Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;
3. Institute of Physics, Chinese Academy of Sciences, Beijing 100091, China
Abstract  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.
Keywords:  11 iron-based superconductor      oxidation mechanism in ambient air      selective surface element substitution      synchrotron radiation spectroscopy  
Received:  20 February 2016      Revised:  10 May 2016      Published:  05 September 2016
PACS:  74.25.Jb (Electronic structure (photoemission, etc.))  
  74.25.-q (Properties of superconductors)  
  81.15.Fg (Pulsed laser ablation deposition)  
Fund: Project supported by the Chinese Academy of Sciences (Grant No. 1G2009312311750101) and the National Natural Science Foundation of China (Grant Nos. 11375228, 11204303, and U1332105).
Corresponding Authors:  Kurash Ibrahim     E-mail:  kurash@ihep.ac.cn

Cite this article: 

Nian Zhang(张念), Chen Liu(刘晨), Jia-Li Zhao(赵佳丽), Tao Lei(雷涛), Jia-Ou Wang(王嘉鸥), Hai-Jie Qian(钱海杰), Rui Wu(吴蕊), Lei Yan(颜雷), Hai-Zhong Guo(郭海中), Kurash Ibrahim(奎热西) Observation of selective surface element substitution in FeTe0.5Se0.5 superconductor thin film exposed to ambient air bysynchrotron radiation spectroscopy 2016 Chin. Phys. B 25 097402

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