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

Abstract

© 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.

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)
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. https://doi.org/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. https://doi.org/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 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.},
doi = {10.1038/ncomms14468},
url = {https://www.osti.gov/biblio/1347558}, journal = {Nature Communications},
issn = {2041-1723},
number = ,
volume = 8,
place = {United States},
year = {2017},
month = {2}
}

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Works referenced in this record:

Tailoring the nature and strength of electron–phonon interactions in the SrTiO3(001) 2D electron liquid
journal, April 2016


Observation of a two-dimensional liquid of Fröhlich polarons at the bare SrTiO3 surface
journal, October 2015


Control of a Two-Dimensional Electron Gas on SrTiO 3 ( 111 ) by Atomic Oxygen
journal, October 2014


Creation and control of a two-dimensional electron liquid at the bare SrTiO3 surface
journal, January 2011


Nodeless superconducting gap in AxFe2Se2 (A=K,Cs) revealed by angle-resolved photoemission spectroscopy
journal, February 2011


High-temperature superconductivity in potassium-coated multilayer FeSe thin films
journal, June 2015


Phase Diagram of (Li 1– x Fe x )OHFeSe: A Bridge between Iron Selenide and Arsenide Superconductors
journal, December 2014


Strong energy–momentum dispersion of phonon-dressed carriers in the lightly doped band insulator SrTiO 3
journal, February 2010


Carrier-Density Control of the SrTiO 3 (001) Surface 2D Electron Gas studied by ARPES
journal, May 2015


Electron pairing in the presence of incipient bands in iron-based superconductors
journal, December 2015


Interface-Induced High-Temperature Superconductivity in Single Unit-Cell FeSe Films on SrTiO 3
journal, March 2012


Tuning the band structure and superconductivity in single-layer FeSe by interface engineering
journal, September 2014


What makes the T c of FeSe/SrTiO 3 so high?
journal, November 2015


Anisotropic two-dimensional electron gas at SrTiO3(110)
journal, March 2014


Superconductivity dichotomy in K-coated single and double unit cell FeSe films on SrTi O 3
journal, November 2015


Interface induced high temperature superconductivity in single unit-cell FeSe on SrTiO 3 (110)
journal, May 2016


Superconductivity in the iron selenide K x Fe 2 Se 2 ( 0 x 1.0 )
journal, November 2010


Onset of the Meissner effect at 65 K in FeSe thin film grown on Nb-doped SrTiO 3 substrate
journal, July 2015


Observation of high- T c superconductivity in rectangular FeSe / SrTiO 3 ( 110 ) monolayers
journal, September 2016


Interfacial mode coupling as the origin of the enhancement of Tc in FeSe films on SrTiO3
journal, November 2014


Superconductivity below 20 K in heavily electron-doped surface layer of FeSe bulk crystal
journal, April 2016


High-Temperature Superconductivity in Single-Unit-Cell FeSe Films on Anatase TiO 2 ( 001 )
journal, August 2016


Observation of Double-Dome Superconductivity in Potassium-Doped FeSe Thin Films
journal, April 2016


Distinct Fermi Surface Topology and Nodeless Superconducting Gap in a ( Tl 0.58 Rb 0.42 ) Fe 1.72 Se 2 Superconductor
journal, March 2011


Density functional calculations of a staggered FeSe monolayer on a SrTiO 3 (110) surface
journal, July 2016


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


Coexistence of superconductivity and antiferromagnetism in (Li0.8Fe0.2)OHFeSe
journal, December 2014


    Works referencing / citing this record:

    Light induced non-volatile switching of superconductivity in single layer FeSe on SrTiO3 substrate
    journal, January 2019


    Dichotomy of superconductivity between monolayer FeS and FeSe
    journal, November 2019


    Unconventional pairing in single FeSe layers
    journal, July 2019


    Self-consistent temperature dependence of quasiparticle bands in monolayer FeSe on SrTiO 3
    journal, September 2018


    Type-II Ising Superconductivity in Two-Dimensional Materials with Spin-Orbit Coupling
    journal, September 2019


    Direct determination of mode-projected electron-phonon coupling in the time domain
    journal, December 2019


    Study on the Multi-level Resistance-Switching Memory and Memory-State-Dependent Photovoltage in Pt/Nd:SrTiO3 Junctions
    journal, January 2018