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Title: Ubiquitous strong electron–phonon coupling at the interface of FeSe/SrTiO 3

Abstract

The observation of replica bands in single-unit-cell FeSe on SrTiO 3 (STO)(001) by angle-resolved photoemission spectroscopy (ARPES) has led to the conjecture that the coupling between FeSe electrons and the STO phonons are responsible for the enhancement of T c over other FeSe-based superconductors. However the recent observation of a similar superconducting gap in single-unit-cell FeSe/STO(110) raised the question of whether a similar mechanism applies. Here we report the ARPES study of the electronic structure of FeSe/STO(110). Similar to the results in FeSe/STO(001), clear replica bands are observed. We also present a comparative study of STO(001) and STO(110) bare surfaces, and observe similar replica bands separated by approximately the same energy, indicating this coupling is a generic feature of the STO surfaces and interfaces. Lastly, our findings suggest that the large superconducting gaps observed in FeSe films grown on different STO surface terminations are likely enhanced by a common mechanism.

Authors:
 [1];  [2]; ORCiD logo [1];  [1];  [3];  [1];  [1];  [1];  [1];  [1]; ORCiD logo [1];  [1];  [4]; ORCiD logo [4]; ORCiD logo [5];  [4];  [1];  [1];  [6];  [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
  2. ShanghaiTech Univ., Shanghai (China)
  3. Boston College, Chestnut Hill, MA (United States)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  6. Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1347558
Alternate Identifier(s):
OSTI ID: 1393616
Grant/Contract Number:  
AC02-76SF00515; AC02-05CH11231
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; electronic properties and materials; superconducting properties and materials; surfaces, interfaces and thin films

Citation Formats

Zhang, Chaofan, Liu, Zhongkai, Chen, Zhuoyu, Xie, Yanwu, He, Ruihua, Tang, Shujie, He, Junfeng, Li, Wei, Jia, Tao, Rebec, Slavko N., Ma, Eric Yue, Yan, Hao, Hashimoto, Makoto, Lu, Donghui, Mo, Sung-Kwan, Hikita, Yasuyuki, Moore, Robert G., Hwang, Harold Y., Lee, Dunghai, and Shen, Zhixun. Ubiquitous strong electron–phonon coupling at the interface of FeSe/SrTiO3. United States: N. p., 2017. Web. doi:10.1038/ncomms14468.
Zhang, Chaofan, Liu, Zhongkai, Chen, Zhuoyu, Xie, Yanwu, He, Ruihua, Tang, Shujie, He, Junfeng, Li, Wei, Jia, Tao, Rebec, Slavko N., Ma, Eric Yue, Yan, Hao, Hashimoto, Makoto, Lu, Donghui, Mo, Sung-Kwan, Hikita, Yasuyuki, Moore, Robert G., Hwang, Harold Y., Lee, Dunghai, & Shen, Zhixun. Ubiquitous strong electron–phonon coupling at the interface of FeSe/SrTiO3. United States. doi:10.1038/ncomms14468.
Zhang, Chaofan, Liu, Zhongkai, Chen, Zhuoyu, Xie, Yanwu, He, Ruihua, Tang, Shujie, He, Junfeng, Li, Wei, Jia, Tao, Rebec, Slavko N., Ma, Eric Yue, Yan, Hao, Hashimoto, Makoto, Lu, Donghui, Mo, Sung-Kwan, Hikita, Yasuyuki, Moore, Robert G., Hwang, Harold Y., Lee, Dunghai, and Shen, Zhixun. Fri . "Ubiquitous strong electron–phonon coupling at the interface of FeSe/SrTiO3". United States. doi:10.1038/ncomms14468. https://www.osti.gov/servlets/purl/1347558.
@article{osti_1347558,
title = {Ubiquitous strong electron–phonon coupling at the interface of FeSe/SrTiO3},
author = {Zhang, Chaofan and Liu, Zhongkai and Chen, Zhuoyu and Xie, Yanwu and He, Ruihua and Tang, Shujie and He, Junfeng and Li, Wei and Jia, Tao and Rebec, Slavko N. and Ma, Eric Yue and Yan, Hao and Hashimoto, Makoto and Lu, Donghui and Mo, Sung-Kwan and Hikita, Yasuyuki and Moore, Robert G. and Hwang, Harold Y. and Lee, Dunghai and Shen, Zhixun},
abstractNote = {The observation of replica bands in single-unit-cell FeSe on SrTiO3 (STO)(001) by angle-resolved photoemission spectroscopy (ARPES) has led to the conjecture that the coupling between FeSe electrons and the STO phonons are responsible for the enhancement of Tc over other FeSe-based superconductors. However the recent observation of a similar superconducting gap in single-unit-cell FeSe/STO(110) raised the question of whether a similar mechanism applies. Here we report the ARPES study of the electronic structure of FeSe/STO(110). Similar to the results in FeSe/STO(001), clear replica bands are observed. We also present a comparative study of STO(001) and STO(110) bare surfaces, and observe similar replica bands separated by approximately the same energy, indicating this coupling is a generic feature of the STO surfaces and interfaces. Lastly, our findings suggest that the large superconducting gaps observed in FeSe films grown on different STO surface terminations are likely enhanced by a common mechanism.},
doi = {10.1038/ncomms14468},
journal = {Nature Communications},
number = ,
volume = 8,
place = {United States},
year = {Fri Feb 10 00:00:00 EST 2017},
month = {Fri Feb 10 00:00:00 EST 2017}
}

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Works referenced in this record:

Two-dimensional electron gas with universal subbands at the surface of SrTiO3
journal, January 2011

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