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

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

Abstract A systematic investigation of oxidation on a superconductive FeTe_0.5Se_0.5 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 FeTe_0.5Se_0.5 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
Accepted manuscript online:

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 FeTe_0.5Se_0.5 superconductor thin film exposed to ambient air bysynchrotron radiation spectroscopy 2016 Chin. Phys. B 25 097402

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

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Observation of selective surface element substitution in FeTe_0.5Se_0.5 superconductor thin film exposed to ambient air bysynchrotron radiation spectroscopy