Direct observation of high-temperature superconductivity in one-unit-cell FeSe films

Wen Hao Zhang, Yi Sun, Jin Song Zhang, Fang Sen Li, Ming Hua Guo, Yan Fei Zhao, Hui Min Zhang, Jun Ping Peng, Ying Xing, Hui Chao Wang, Takeshi Fujita, Akihiko Hirata, Zhi Li, Hao Ding, Chen Jia Tang, Meng Wang, Qing Yan Wang, Ke He, Shuai Hua Ji, Xi ChenJun Feng Wang, Zheng Cai Xia, Liang Li, Ya Yu Wang, Jian Wang*, Li Li Wang, Ming Wei Chen, Qi Kun Xue, Xu Cun Ma

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

248 Citations (Scopus)


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 TC above 40 K and an extremely large critical current density JC∼1. 7×106 A/cm2 at 2 K, which are much higher than TC∼8 K and JC∼104 A/cm2 for bulk FeSe, respectively. Our work may pave the way to enhancing and tailoring superconductivity by interface engineering.

Original languageEnglish
Article number017401
JournalChinese Physics Letters
Issue number1
Publication statusPublished - 2014 Jan
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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