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

Seo, J. J.; Kim, B. Y.; Kim, B. S.; Jeong, J. K.; Ok, J. M.; Kim, Jun Sung; Denlinger, J. D.; Mo, S. -K.; Kim, C.; Kim, Y. K.

doi:10.1038/ncomms11116

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

Journal Article · Wed Apr 06 00:00:00 EDT 2016 · Nature Communications

DOI:https://doi.org/10.1038/ncomms11116· OSTI ID:1379279

Seo, J. J. ^[1]; Kim, B. Y. ^[2]; Kim, B. S. ^[3]; Jeong, J. K. ^[4]; Ok, J. M. ^[5]; Kim, Jun Sung ^[5]; Denlinger, J. D. ^[6]; Mo, S. -K. ^[6]; Kim, C. ^[3]; Kim, Y. K. ^[7]

Yonsei Univ., Seoul (Korea). Inst. of Physics and Applied Physics; Inst. for Basic Science, Seoul (Korea). Center for Correlated Electron Systems
Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
Inst. for Basic Science, Seoul (Korea). Center for Correlated Electron Systems; Seoul National Univ. (Korea, Republic of). Dept. of Physics and Astronomy
Yonsei Univ., Seoul (Korea). Inst. of Physics and Applied Physics
Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of). Dept. of Physics
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
Inst. for Basic Science, Seoul (Korea). Center for Correlated Electron Systems; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source; Seoul National Univ. (Korea, Republic of). Dept. of Physics and Astronomy

A superconducting transition temperature (T _c ) as high as 100 K was recently discovered in one monolayer FeSe grown on SrTiO ₃ . 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 SrTiO ₃ . 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 SrTiO ₃ .

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1379279

Journal Information:: Nature Communications, Vol. 7; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 33 works

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Role of ${SrTiO}_{3}$ phonon penetrating into thin FeSe films in the enhancement of superconductivity Zhang, Shuyuan; Guan, Jiaqi; Jia, Xun Physical Review B, Vol. 94, Issue 8 https://doi.org/10.1103/physrevb.94.081116	journal	August 2016
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Direct imaging of electron transfer and its influence on superconducting pairing at FeSe/SrTiO ₃ interface Zhao, Weiwei; Li, Mingda; Chang, Cui-Zu Science Advances, Vol. 4, Issue 3 https://doi.org/10.1126/sciadv.aao2682	journal	March 2018
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