Direct Observation of High-Temperature Superconductivity in One-Unit-Cell FeSe Films

作者：Wenhao Zhang, Yi Sun, Jinsong Zhang, Fang-Sen Li, Ming-Hua Guo, Yan-Fei Zhao, Hui Min Zhang, Jun-Ping Peng, Ying Xing, Huichao Wang, Takeshi Fujita, Akihiko Hirata, Zhi Li, Hao Ding, Chen-Jia Tang, Meng Wang, Qing-Yan Wang, Ke He, S. H. Ji, Xi Chen, Junfeng Wang, Zheng-Cai Xia, Liang Li, Yayu Wang, Jian Wang, Li-Li Wang, Mingwei Chen, Qi-Kun Xue, Xu-Cun Ma · 发表于：Chinese Physics Letters · 年份：2014 · DOI：10.1088/0256-307x/31/1/017401 · 被引用次数：303 · 研究领域：Iron-based superconductors research、Physics of Superconductivity and Magnetism、Corporate Taxation and Avoidance

We prepared one-unit-cell (1-UC) thick FeSe films on insulating SrTiO 3 substrates with non-superconducting FeTe protection layers by molecular beam epitaxy for ex situ studies. By direct transport and magnetic measurements, we provide definitive evidence for high temperature superconductivity in the 1-UC FeSe films with an onset T C above 40 K and an extremely large critical current density J C ∼1.7 × 10 6 A/cm 2 at 2 K, which are much higher than T C ∼8 K and J C ∼10 4 A/cm 2 for bulk FeSe, respectively. Our work may pave the way to enhancing and tailoring superconductivity by interface engineering.