Chin. Phys. Lett.  2012, Vol. 29 Issue (3): 037402    DOI: 10.1088/0256-307X/29/3/037402
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
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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.

Keywords: 74.25.F-      74.55.+v      74.70.Xa     
Received: 01 February 2012      Published: 11 March 2012
PACS:  74.25.F- (Transport properties)  
  74.55.+v (Tunneling phenomena: single particle tunneling and STM)  
  74.70.Xa (Pnictides and chalcogenides)  
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