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:
- Publication Date:
- 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.
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},
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}
}
https://doi.org/10.1088/1367-2630/18/2/022001
Web of Science
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