Superconductivity below 20 K in heavily electron-doped surface layer of FeSe bulk crystal

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A superconducting transition temperature (T-c) as high as 100 K was recently discovered in one monolayer FeSe grown on SrTiO3. The discovery ignited efforts to identify the mechanism for the markedly enhanced T-c from its bulk value of 8 K. There are two main views about the origin of the T-c enhancement: interfacial effects and/or excess electrons with strong electron correlation. Here, we report the observation of superconductivity below 20 K in surface electron-doped bulk FeSe. The doped surface layer possesses all the key spectroscopic aspects of the monolayer FeSe on SrTiO3. Without interfacial effects, the surface layer state has a moderate T-c of 20 K with a smaller gap opening of 4.2 meV. Our results show that excess electrons with strong correlation cannot induce the maximum T-c, which in turn reveals the need for interfacial effects to achieve the highest T-c in one monolayer FeSe on SrTiO3
Publisher
NATURE PUBLISHING GROUP
Issue Date
2016-04
Language
English
Article Type
Article
Keywords

HIGH-TEMPERATURE SUPERCONDUCTIVITY; SINGLE-LAYER; FESE/SRTIO3 FILMS; IRON PNICTIDES; THIN-FILMS; INTERFACE; ORIGIN; INSULATOR; OXIDES; SRTIO3

Citation

NATURE COMMUNICATIONS, v.7

ISSN
2041-1723
DOI
10.1038/ncomms11116
URI
http://hdl.handle.net/10203/212577
Appears in Collection
NT-Journal Papers(저널논문)
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