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

Rademaker, Louk; Wang, Yan; Berlijn, Tom; Johnston, Steve

doi:10.1088/1367-2630/18/2/022001

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 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.

Authors:: Rademaker, Louk; Wang, Yan; Berlijn, Tom; Johnston, Steve

Publication Date:: Mon Feb 01 00:00:00 EST 2016

Research Org.:: Oak Ridge National Laboratory (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:: 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.

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                    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

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                    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.

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@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},

  journal      = {New Journal of Physics},

  number       = 2,

  volume       = 18,

  place        = {United Kingdom},

  year         = {Mon Feb 01 00:00:00 EST 2016},

  month        = {Mon Feb 01 00:00:00 EST 2016}

}

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

Abstract

Citation Formats

Electronic origin of high-temperature superconductivity in single-layer FeSe superconductor journal, January 2012

Phase diagram and electronic indication of high-temperature superconductivity at 65 K in single-layer FeSe films journal, May 2013

Interface charge doping effects on superconductivity of single-unit-cell FeSe films on SrTiO 3 substrates journal, February 2014

Interface-induced superconductivity and strain-dependent spin density waves in FeSe/SrTiO3 thin films journal, May 2013

Antiferromagnetic FeSe monolayer on SrTiO3: The charge doping and electric field effects journal, July 2013

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

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

Measurement of an Enhanced Superconducting Phase and a Pronounced Anisotropy of the Energy Gap of a Strained FeSe Single Layer in FeSe / Nb : SrTiO 3 / KTaO 3 Heterostructures Using Photoemission Spectroscopy journal, March 2014

Atomic and electronic structures of FeSe monolayer and bilayer thin films on SrTiO 3 (001): First-principles study journal, June 2012

High-temperature superconductivity at the FeSe/SrTiO 3 interface journal, October 2012

Electron-phonon coupling enhanced by the FeSe/SrTiO 3 interface journal, May 2014

Dichotomy of the electronic structure and superconductivity between single-layer and double-layer FeSe/SrTiO3 films journal, September 2014

Plain s-wave superconductivity in single-layer FeSe on SrTiO3 probed by scanning tunnelling microscopy journal, August 2015

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

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

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Interface-enhanced high-temperature superconductivity in single-unit-cell FeT e 1 − x S e x films on SrTi O 3 journal, June 2015

Normal and superconducting state in the presence of forward electron-phonon and impurity scattering journal, May 1999

Density-of-states-driven anisotropies induced by momentum decoupling in Bi 2 Sr 2 Ca Cu 2 O 8 journal, September 1996

Evidence for the Importance of Extended Coulomb Interactions and Forward Scattering in Cuprate Superconductors journal, April 2012

Electron-phonon vertex in the two-dimensional one-band Hubbard model journal, December 2003

Influence of strong electron correlations on the electron-phonon coupling in high- T c oxides journal, February 1994

d x 2 − y 2 symmetry and the pairing mechanism journal, December 1996

s- and d-wave symmetries of the solutions of the Eliashberg equations journal, March 1996

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Small- q phonon-mediated unconventional superconductivity in the iron pnictides journal, March 2011

Nonadiabatic superconductivity. I. Vertex corrections for the electron-phonon interactions journal, October 1995

Nonadiabatic superconductivity. II. Generalized Eliashberg equations beyond Migdal’s theorem journal, October 1995

Large phonon band gap in Sr Ti O 3 and the vibrational signatures of ferroelectricity in A Ti O 3 perovskites: First-principles lattice dynamics and inelastic neutron scattering journal, April 2008

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Systematic study of electron-phonon coupling to oxygen modes across the cuprates journal, August 2010

Iterative analytic continuation of the electron self-energy to the real axis journal, April 1988

Two-gap superconductivity in heavily n -doped graphene: Ab initio Migdal-Eliashberg theory journal, July 2014

Enhancement of Superconductivity near a Nematic Quantum Critical Point journal, March 2015

Pairing interaction near a nematic quantum critical point of a three-band CuO 2 model journal, November 2014

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

Electronic origin of high-temperature superconductivity in single-layer FeSe superconductor
journal, January 2012

Phase diagram and electronic indication of high-temperature superconductivity at 65 K in single-layer FeSe films
journal, May 2013

Interface charge doping effects on superconductivity of single-unit-cell FeSe films on ${SrTiO}_{3}$ substrates
journal, February 2014

Interface-induced superconductivity and strain-dependent spin density waves in FeSe/SrTiO3 thin films
journal, May 2013

Antiferromagnetic FeSe monolayer on SrTiO3: The charge doping and electric field effects
journal, July 2013

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

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

Measurement of an Enhanced Superconducting Phase and a Pronounced Anisotropy of the Energy Gap of a Strained FeSe Single Layer in $FeSe / Nb : {SrTiO}_{3} / {KTaO}_{3}$ Heterostructures Using Photoemission Spectroscopy
journal, March 2014

Atomic and electronic structures of FeSe monolayer and bilayer thin films on SrTiO $_{3}$ (001): First-principles study
journal, June 2012

High-temperature superconductivity at the FeSe/SrTiO $_{3}$ interface
journal, October 2012

Electron-phonon coupling enhanced by the FeSe/SrTiO ₃ interface
journal, May 2014

Dichotomy of the electronic structure and superconductivity between single-layer and double-layer FeSe/SrTiO3 films
journal, September 2014

Plain s-wave superconductivity in single-layer FeSe on SrTiO3 probed by scanning tunnelling microscopy
journal, August 2015

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

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

Superconductivity in the PbO-type structure -FeSe
journal, September 2008

Interface-enhanced high-temperature superconductivity in single-unit-cell $FeT e_{1 - x} S e_{x}$ films on $SrTi O_{3}$
journal, June 2015

Normal and superconducting state in the presence of forward electron-phonon and impurity scattering
journal, May 1999

Density-of-states-driven anisotropies induced by momentum decoupling in ${Bi}_{2}$ ${Sr}_{2}$ Ca ${Cu}_{2}$ $O_{8}$
journal, September 1996

Evidence for the Importance of Extended Coulomb Interactions and Forward Scattering in Cuprate Superconductors
journal, April 2012

Electron-phonon vertex in the two-dimensional one-band Hubbard model
journal, December 2003

Influence of strong electron correlations on the electron-phonon coupling in high- $T_{c}$ oxides
journal, February 1994

$d_{x^{2} - y^{2}}$ symmetry and the pairing mechanism
journal, December 1996

s- and d-wave symmetries of the solutions of the Eliashberg equations
journal, March 1996

Forward scattering peak in the electron-phonon interaction and impurity scattering of cuprate superconductors
journal, January 2005

Small- $q$ phonon-mediated unconventional superconductivity in the iron pnictides
journal, March 2011

Nonadiabatic superconductivity. I. Vertex corrections for the electron-phonon interactions
journal, October 1995

Nonadiabatic superconductivity. II. Generalized Eliashberg equations beyond Migdal’s theorem
journal, October 1995

Large phonon band gap in $Sr Ti O_{3}$ and the vibrational signatures of ferroelectricity in $A Ti O_{3}$ perovskites: First-principles lattice dynamics and inelastic neutron scattering
journal, April 2008

Properties of boson-exchange superconductors
journal, October 1990

Theory of Superconducting Tc
book, January 1983

Systematic study of electron-phonon coupling to oxygen modes across the cuprates
journal, August 2010

Iterative analytic continuation of the electron self-energy to the real axis
journal, April 1988

Two-gap superconductivity in heavily $n$ -doped graphene: Ab initio Migdal-Eliashberg theory
journal, July 2014

Enhancement of Superconductivity near a Nematic Quantum Critical Point
journal, March 2015

Pairing interaction near a nematic quantum critical point of a three-band ${CuO}_{2}$ model
journal, November 2014