Observation of selective surface element substitution in FeTe<sub>0.5</sub>Se<sub>0.5</sub> superconductor thin film exposed to ambient air by synchrotron radiation spectroscopy

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

Zhang Nian^{1, 2}, Liu Chen¹, Zhao Jia-Li¹, Lei Tao¹, Wang Jia-Ou¹, Qian Hai-Jie¹, Wu Rui¹, Yan Lei³, Guo Hai-Zhong³, Ibrahim Kurash^{1, †,}

Electric resistance versus temperature of the as-grown, exposed-to-air, and after-treatment films. The as-grown, exposed-to-air, and after-treatment films are respectively obtained after steps (a)–(c) in Fig. 1.