Direct Observation of High-Temperature Superconductivity in One-Unit-Cell FeSe Films
ZHANG Wen-Hao1,4, SUN Yi2 , ZHANG Jin-Song1, LI Fang-Sen1,4, GUO Ming-Hua1, ZHAO Yan-Fei2, ZHANG Hui-Min4, PENG Jun-Ping4, XING Ying2, WANG Hui-Chao2, FUJITA Takeshi5, HIRATA Akihiko5, LI Zhi4, DING Hao1, TANG Chen-Jia1,4, WANG Meng4, WANG Qing-Yan1, HE Ke1,3,4, JI Shuai-Hua1, 3, CHEN Xi1,3, WANG Jun-Feng6, XIA Zheng-Cai6, LI Liang6, WANG Ya-Yu1,3, WANG Jian2,3∗∗, WANG Li-Li1,3,4∗∗, CHEN Ming-Wei5, XUE Qi-Kun1,3∗∗, MA Xu-Cun1,3,4
1State Key Lab of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084 2International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871 3Collaborative Innovation Center of Quantum Matter, Beijing 4Institute of Physics, Chinese Academy of Sciences, Beijing 100190 5WPI Advanced Institute for Materials Research, Tohoku University, Sendai 9808577, Japan 6Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430071
We prepared one-unit-cell (1-UC) thick FeSe films on insulating SrTiO3 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.
(Superconducting films and low-dimensional structures)
引用本文:
. [J]. 中国物理快报, 2014, 31(1): 17401-017401.
ZHANG Wen-Hao, SUN Yi, ZHANG Jin-Song, LI Fang-Sen, GUO Ming-Hua, ZHAO Yan-Fei, ZHANG Hui-Min, PENG Jun-Ping, XING Ying, WANG Hui-Chao, FUJITA Takeshi, HIRATA Akihiko, LI Zhi, DING Hao, TANG Chen-Jia, WANG Meng, WANG Qing-Yan, HE Ke, JI Shuai-Hua, CHEN Xi, WANG Jun-Feng, XIA Zheng-Cai, LI Liang, WANG Ya-Yu, WANG Jian, WANG Li-Li, CHEN Ming-Wei, XUE Qi-Kun, MA Xu-Cun. Direct Observation of High-Temperature Superconductivity in One-Unit-Cell FeSe Films. Chin. Phys. Lett., 2014, 31(1): 17401-017401.
2014, Vol. 31 
