Correlation of Fe-based Superconductivity and Electron-Phonon Coupling in an FeAs/Oxide Heterostructure

Abstract

Interfacial phonons between iron-based superconductors (FeSCs) and perovskite substrates have received considerable attention due to the possibility of enhancing preexisting superconductivity. Using scanning tunneling spectroscopy, we studied the correlation between superconductivity and e-ph interaction with interfacial-phonons in an iron-based superconductor Sr${}_2$VO${}_3$FeAs ($T_c\approx$ 33 K) made of alternating FeSC and oxide layers. The quasiparticle interference measurement over regions with systematically different average superconducting gaps due to the e-ph coupling locally modulated by O vacancies in VO${}_2$ layer, and supporting self-consistent momentum-dependent Eliashberg calculations provide a unique real-space evidence of the forward-scattering interfacial phonon contribution to the total superconducting pairing.

46 pages, 22 figures

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Cited by in corpus (14)

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• Switching Magnetism and Superconductivity with Spin-Polarized Current in Iron-Based Superconductor
• Eliashberg theory for spin-fluctuations mediated superconductivity -- Application to bulk and monolayer FeSe
• Enhanced superconductivity in FeSe/SrTiO${}_3$ from the combination of forward scattering phonons and spin fluctuations
• Phase competition in a one-dimensional three-orbital Hubbard-Holstein model
• Constraints on the total coupling strength to bosons in iron based superconductors
• Quasi-one Dimensional Nanostructures as Sign of Nematicity in Iron Pnictides and Chalcogenides
• Competing Correlated Insulators in multi-orbital systems coupled to phonons
• Versatile Variable Temperature and Magnetic Field Scanning Probe Microscope for Advanced Material Research
• Strong Momentum-Dependent Electron-Magnon Renormalization of a Surface Resonance on Iron
• Scanning Tunneling Spectroscopy of Subsurface Ag and Ge Impurities in Copper
• Identifying a forward scattering superconductor through pump-probe spectroscopy
• Superconductor-Insulator transition in a two-orbital attractive Hubbard model with Hund's exchange