Tunable critical temperature for superconductivity in FeSe thin films by pulsed laser deposition

作者：Zhongpei Feng, Jie Yuan, Ge He, Wei Hu, Zefeng Lin, Dong Li, Xingyu Jiang, Yulong Huang, Shunli Ni, Jun Li, Beiyi Zhu, Xiaoli Dong, Fang Zhou, Huabing Wang, Zhongxian Zhao, Kui Jin · 发表于：Scientific Reports · 年份：2018 · DOI：10.1038/s41598-018-22291-z · 被引用次数：67 · 研究领域：Iron-based superconductors research、Corporate Taxation and Avoidance、Intellectual Capital and Performance Analysis

Abstract Stabilized FeSe thin films in ambient pressure with tunable superconducting critical temperature would be a promising candidate for superconducting electronic devices. By carefully controlling the depositions on twelve kinds of substrates using a pulsed laser deposition technique single crystalline FeSe thin films were fabricated. The high quality of the thin films was confirmed by X-ray diffraction with a full width at half maximum of 0.515° in the rocking curve and clear four-fold symmetry in φ -scan. The films have a maximum T c ~ 15 K on the CaF 2 substrate and were stable in ambient conditions air for more than half a year. Slightly tuning the stoichiometry of the FeSe targets, the superconducting critical temperature becomes adjustable below 15 K with quite narrow transition width less than 2 K. These FeSe thin films deposited on different substrates are optimized respectively. The T c of these optimized films show a relation with the out-of-plane ( c -axis) lattice parameter of the FeSe films.