Interface-Induced High-Temperature Superconductivity in Single Unit-Cell FeSe Films on SrTiO3
WANG Qing-Yan1,2, LI Zhi2, ZHANG Wen-Hao1, ZHANG Zuo-Cheng1, ZHANG Jin-Song1, LI Wei1, DING Hao1, OU Yun-Bo2, DENG Peng1, CHANG Kai1, WEN Jing1, SONG Can-Li1, HE Ke2, JIA Jin-Feng1, JI Shuai-Hua1, WANG Ya-Yu1, WANG Li-Li2, CHEN Xi1, MA Xu-Cun2**, XUE Qi-Kun1**
1State Key Lab of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084 2Institute of Physics, Chinese Academy of Sciences, Beijing 100190
Interface-Induced High-Temperature Superconductivity in Single Unit-Cell FeSe Films on SrTiO3
WANG Qing-Yan1,2, LI Zhi2, ZHANG Wen-Hao1, ZHANG Zuo-Cheng1, ZHANG Jin-Song1, LI Wei1, DING Hao1, OU Yun-Bo2, DENG Peng1, CHANG Kai1, WEN Jing1, SONG Can-Li1, HE Ke2, JIA Jin-Feng1, JI Shuai-Hua1, WANG Ya-Yu1, WANG Li-Li2, CHEN Xi1, MA Xu-Cun2**, XUE Qi-Kun1**
1State Key Lab of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084 2Institute of Physics, Chinese Academy of Sciences, Beijing 100190
We report high transition temperature superconductivity in one unit-cell (UC) thick FeSe films grown on a Se-etched SrTiO3(001) substrate by molecular beam epitaxy (MBE). A superconducting gap as large as 20 meV and the magnetic field induced vortex state revealed by in situ scanning tunneling microscopy (STM) suggest that the superconductivity of the 1 UC FeSe films could occur around 77 K. The control transport measurement shows that the onset superconductivity temperature is well above 50 K. Our work not only demonstrates a powerful way for finding new superconductors and for raising TC, but also provides a well-defined platform for systematic studies of the mechanism of unconventional superconductivity by using different superconducting materials and substrates.
We report high transition temperature superconductivity in one unit-cell (UC) thick FeSe films grown on a Se-etched SrTiO3(001) substrate by molecular beam epitaxy (MBE). A superconducting gap as large as 20 meV and the magnetic field induced vortex state revealed by in situ scanning tunneling microscopy (STM) suggest that the superconductivity of the 1 UC FeSe films could occur around 77 K. The control transport measurement shows that the onset superconductivity temperature is well above 50 K. Our work not only demonstrates a powerful way for finding new superconductors and for raising TC, but also provides a well-defined platform for systematic studies of the mechanism of unconventional superconductivity by using different superconducting materials and substrates.
WANG Qing-Yan1,2, LI Zhi2, ZHANG Wen-Hao1, ZHANG Zuo-Cheng1, ZHANG Jin-Song1, LI Wei1, DING Hao1, OU Yun-Bo2, DENG Peng1, CHANG Kai1, WEN Jing1, SONG Can-Li1, HE Ke2, JIA Jin-Feng1, JI Shuai-Hua1, WANG Ya-Yu1, WANG Li-Li2, CHEN Xi1, MA Xu-Cun2**, XUE Qi-Kun1**. Interface-Induced High-Temperature Superconductivity in Single Unit-Cell FeSe Films on SrTiO3[J]. 中国物理快报, 2012, 29(3): 37402-037402.
WANG Qing-Yan, LI Zhi, ZHANG Wen-Hao, ZHANG Zuo-Cheng, ZHANG Jin-Song, LI Wei, DING Hao, OU Yun-Bo, DENG Peng, CHANG Kai, WEN Jing, SONG Can-Li, HE Ke, JIA Jin-Feng, JI Shuai-Hua, WANG Ya-Yu, WANG Li-Li, CHEN Xi, MA Xu-Cun, XUE Qi-Kun. Interface-Induced High-Temperature Superconductivity in Single Unit-Cell FeSe Films on SrTiO3. Chin. Phys. Lett., 2012, 29(3): 37402-037402.
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2012, Vol. 29 
