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

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Title
Superconductivity below 20 K in heavily electron-doped surface layer of FeSe bulk crystal
Author(s)
Jeongjin Seo; B.Y. Kim; Beom Seo Kim; J.K. Jeong; J.M. Ok; Jun Sung KIm; J.D. Denlinger; S.-K. Mo; Chanyoung Kim; Yeongkwan Kim
Publication Date
2016-04
Journal
NATURE COMMUNICATIONS, v.7, no., pp.11116 -
Publisher
NATURE PUBLISHING GROUP
Abstract
A superconducting transition temperature (Tc) 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 Tc from its bulk value of 8 K. There are two main views about the origin of the Tc 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 Tc 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 Tc, which in turn reveals the need for interfacial effects to achieve the highest Tc in one monolayer FeSe on SrTiO3.
URI
https://pr.ibs.re.kr/handle/8788114/2450
ISSN
2041-1723
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
Files in This Item:
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