Phonon linewidth due to electron-phonon interactions with strong forward scattering in FeSe thin films on oxide substrates

Wang, Yan; Rademaker, Louk; Dagotto, Elbio R.; Johnston, Steven

doi:10.1103/PhysRevB.96.054515

Title: Phonon linewidth due to electron-phonon interactions with strong forward scattering in FeSe thin films on oxide substrates

Journal Article · Fri Aug 18 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.96.054515· OSTI ID:1399226

Wang, Yan ^[1]; Rademaker, Louk ^[2]; Dagotto, Elbio R. ^[3]; Johnston, Steven ^[1]

Univ. of Tennessee, Knoxville, TN (United States)
Univ. of California, Santa Barbara, CA (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here, the discovery of an enhanced superconducting transition temperature T_c in monolayers of FeSe grown on several oxide substrates has opened a new route to high-T_c superconductivity through interface engineering. One proposal for the origin of the observed enhancement is an electronphonon (e-ph) interaction across the interface that peaked at small momentum transfers. In this paper, we examine the implications of such a coupling on the phononic properties of the system. We show that a strong forward scattering leads to a sizable broadening of phonon lineshape, which may result in charge instabilities at long-wavelengths. However, we further find that the inclusion of Coulombic screening significantly reduces the phonon broadening. Our results show that one might not expect anomalously broad phonon linewidths in the FeSe interface systems, despite the fact that the e-ph interaction has a strong peak in the forward scattering (small q ) direction.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1399226

Alternate ID(s):: OSTI ID: 1375549

Journal Information:: Physical Review B, Vol. 96, Issue 5; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Evidence of cooperative effect on the enhanced superconducting transition temperature at the FeSe/SrTiO3 interface Song, Q.; Yu, T. L.; Lou, X. Nature Communications, Vol. 10, Issue 1 https://doi.org/10.1038/s41467-019-08560-z	journal	February 2019
Electronic and phononic properties of a two-dimensional electron gas coupled to dipolar phonons via small-momentum-transfer scattering Li, Zi-Xiang; Devereaux, T. P.; Lee, Dung-Hai Physical Review B, Vol. 100, Issue 24 https://doi.org/10.1103/physrevb.100.241101	journal	December 2019
Cavity quantum-electrodynamical polaritonically enhanced electron-phonon coupling and its influence on superconductivity Sentef, M. A.; Ruggenthaler, M.; Rubio, A. Science Advances, Vol. 4, Issue 11 https://doi.org/10.1126/sciadv.aau6969	journal	November 2018

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