| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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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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Abstract 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.
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| Keywords:
74.25.F-
74.55.+v
74.70.Xa
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Received: 01 February 2012
Published: 11 March 2012
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| PACS: |
74.25.F-
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(Transport properties)
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74.55.+v
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(Tunneling phenomena: single particle tunneling and STM)
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74.70.Xa
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(Pnictides and chalcogenides)
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