Ubiquitous strong electron–phonon coupling at the interface of FeSe/SrTiO3

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

doi:10.1038/ncomms14468

Title: Ubiquitous strong electron–phonon coupling at the interface of FeSe/SrTiO₃

Journal Article · Fri Feb 10 00:00:00 EST 2017 · Nature Communications

DOI:https://doi.org/10.1038/ncomms14468· OSTI ID:1347558

Zhang, Chaofan ^[1]; Liu, Zhongkai ^[2];

^[1]; Xie, Yanwu ^[1]; He, Ruihua ^[3]; Tang, Shujie ^[1]; He, Junfeng ^[1]; Li, Wei ^[1]; Jia, Tao ^[1]; Rebec, Slavko N. ^[1];

^[1]; Yan, Hao ^[1]; Hashimoto, Makoto ^[4];

^[4];

^[5]; Hikita, Yasuyuki ^[4]; Moore, Robert G. ^[1]; Hwang, Harold Y. ^[1]; Lee, Dunghai ^[6]; Shen, Zhixun ^[1]

SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
ShanghaiTech Univ., Shanghai (China)
Boston College, Chestnut Hill, MA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States)

© The Author(s) 2017. 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. 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.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

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

Grant/Contract Number:: AC02-76SF00515; AC02-05CH11231

OSTI ID:: 1347558

Alternate ID(s):: OSTI ID: 1393616

Journal Information:: Nature Communications, Vol. 8; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 48 works

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Light induced non-volatile switching of superconductivity in single layer FeSe on SrTiO3 substrate Yang, Ming; Yan, Chenhui; Ma, Yanjun Nature Communications, Vol. 10, Issue 1 https://doi.org/10.1038/s41467-018-08024-w	journal	January 2019
Dichotomy of superconductivity between monolayer FeS and FeSe Shigekawa, Koshin; Nakayama, Kosuke; Kuno, Masato Proceedings of the National Academy of Sciences, Vol. 116, Issue 49 https://doi.org/10.1073/pnas.1912836116	journal	November 2019
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Electron Phonon Coupling versus Photoelectron Energy Loss at the Origin of Replica Bands in Photoemission of FeSe on SrTiO 3 Li, Fengmiao; Sawatzky, George A. Physical Review Letters, Vol. 120, Issue 23 https://doi.org/10.1103/physrevlett.120.237001	journal	June 2018
Direct determination of mode-projected electron-phonon coupling in the time domain Na, M. X.; Mills, A. K.; Boschini, F. Science, Vol. 366, Issue 6470 https://doi.org/10.1126/science.aaw1662	journal	December 2019
Study on the Multi-level Resistance-Switching Memory and Memory-State-Dependent Photovoltage in Pt/Nd:SrTiO3 Junctions Wang, Shengkai; Sun, Xianwen; Li, Guanghui Nanoscale Research Letters, Vol. 13, Issue 1 https://doi.org/10.1186/s11671-018-2433-5	journal	January 2018
Phonon linewidth due to electron-phonon interactions with strong forward scattering in FeSe thin films on oxide substrates Wang, Yan; Rademaker, Louk; Dagotto, Elbio arXiv https://doi.org/10.48550/arxiv.1703.02013	text	January 2017
Direct determination of mode-projected electron-phonon coupling in the time-domain Na, MengXing; Mills, Arthur K.; Boschini, Fabio arXiv https://doi.org/10.48550/arxiv.1902.05572	text	January 2019

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