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

Journal Article · Mon Feb 01 00:00:00 EST 2016 · New Journal of Physics

DOI:https://doi.org/10.1088/1367-2630/18/2/022001· OSTI ID:1237517

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

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Netherlands Organization for Scientific Research (NWO)

Grant/Contract Number:: Wigner Fellowship; Rubicon Fellowship; AC05-00OR22725

OSTI ID:: 1237517

Alternate ID(s):: OSTI ID: 1237518; OSTI ID: 1261270

Journal Information:: New Journal of Physics, Journal Name: New Journal of Physics Vol. 18 Journal Issue: 2; ISSN 1367-2630

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Cited by: 96 works

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

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