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Title: Enhanced superconductivity due to forward scattering in FeSe thin films on SrTiO 3 substrates

Abstract

In this paper, we study the consequences of an electron–phonon (e–ph) interaction that is strongly peaked in the forward scattering ($${\bf{q}}=0$$) direction in a two-dimensional superconductor using Migdal–Eliashberg theory. We find that strong forward scattering results in an enhanced T c that is linearly proportional to the strength of the dimensionless e–ph coupling constant $${\lambda }_{m}$$ in the weak coupling limit. This interaction also produces distinct replica bands in the single-particle spectral function, similar to those observed in recent angle-resolved photoemission experiments on FeSe monolayers on SrTiO 3 and BaTiO 3 substrates. Finally, by comparing our model to photoemission experiments, we infer an e–ph coupling strength that can provide a significant portion of the observed high T c in these systems.

Authors:
; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Netherlands Organization for Scientific Research (NWO)
OSTI Identifier:
1237517
Alternate Identifier(s):
OSTI ID: 1237518; OSTI ID: 1261270
Grant/Contract Number:  
Wigner Fellowship; Rubicon Fellowship; AC05-00OR22725
Resource Type:
Journal Article: Published Article
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Name: New Journal of Physics Journal Volume: 18 Journal Issue: 2; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Country of Publication:
United Kingdom
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; superconductivity; electron-phonon interactions; Eliashberg theory; FeSe thin films

Citation Formats

Rademaker, Louk, Wang, Yan, Berlijn, Tom, and Johnston, Steve. Enhanced superconductivity due to forward scattering in FeSe thin films on SrTiO 3 substrates. United Kingdom: N. p., 2016. Web. doi:10.1088/1367-2630/18/2/022001.
Rademaker, Louk, Wang, Yan, Berlijn, Tom, & Johnston, Steve. Enhanced superconductivity due to forward scattering in FeSe thin films on SrTiO 3 substrates. United Kingdom. https://doi.org/10.1088/1367-2630/18/2/022001
Rademaker, Louk, Wang, Yan, Berlijn, Tom, and Johnston, Steve. Mon . "Enhanced superconductivity due to forward scattering in FeSe thin films on SrTiO 3 substrates". United Kingdom. https://doi.org/10.1088/1367-2630/18/2/022001.
@article{osti_1237517,
title = {Enhanced superconductivity due to forward scattering in FeSe thin films on SrTiO 3 substrates},
author = {Rademaker, Louk and Wang, Yan and Berlijn, Tom and Johnston, Steve},
abstractNote = {In this paper, we study the consequences of an electron–phonon (e–ph) interaction that is strongly peaked in the forward scattering (${\bf{q}}=0$) direction in a two-dimensional superconductor using Migdal–Eliashberg theory. We find that strong forward scattering results in an enhanced T c that is linearly proportional to the strength of the dimensionless e–ph coupling constant ${\lambda }_{m}$ in the weak coupling limit. This interaction also produces distinct replica bands in the single-particle spectral function, similar to those observed in recent angle-resolved photoemission experiments on FeSe monolayers on SrTiO3 and BaTiO3 substrates. Finally, by comparing our model to photoemission experiments, we infer an e–ph coupling strength that can provide a significant portion of the observed high T c in these systems.},
doi = {10.1088/1367-2630/18/2/022001},
url = {https://www.osti.gov/biblio/1237517}, journal = {New Journal of Physics},
issn = {1367-2630},
number = 2,
volume = 18,
place = {United Kingdom},
year = {2016},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at https://doi.org/10.1088/1367-2630/18/2/022001

Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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Works referenced in this record:

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Phase diagram and electronic indication of high-temperature superconductivity at 65 K in single-layer FeSe films
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    Works referencing / citing this record:

    Ab initio study of cross-interface electron-phonon couplings in FeSe thin films on SrTiO 3 and BaTiO 3
    journal, April 2016


    Type-II Dirac semimetal stabilized by electron-phonon coupling
    journal, December 2017


    Superconducting properties of the s ± -wave state: Fe-based superconductors
    journal, February 2017


    High-temperature superconductivity in one-unit-cell FeSe films
    journal, March 2017


    Band structure and charge doping effects of the potassium-adsorbed FeSe / SrTiO 3 system
    journal, February 2016


    Bounds on nanoscale nematicity in single-layer FeSe / SrTiO 3
    journal, March 2016


    Charge transfer and electron-phonon coupling in monolayer FeSe on Nb-doped SrTiO 3
    journal, June 2016


    Dipolar phonons and electronic screening in monolayer FeSe on SrTiO 3
    journal, August 2017


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


    Phonon-mediated superconductivity in low carrier-density systems
    journal, March 2019


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


    Hund-Enhanced Electronic Compressibility in FeSe and its Correlation with T c
    journal, November 2018


    Direct imaging of electron transfer and its influence on superconducting pairing at FeSe/SrTiO 3 interface
    journal, March 2018


    On the origin of the shallow and “replica” bands in FeSe monolayer superconductors
    journal, March 2017