Soft phonons in the interface layer of the STO substrate can explain high temperature superconductivity in one unit cell FeSe

Abstract

Using a microscopic model of lattice vibrations in the STO(001) substrate, an additional 50 mev longitudinal optical (LO) interface mode is identified. The soft mode propagating mainly in the first TiO2 layer ("O chains") has stronger electron - phonon coupling to electron gas in FeSe than a well known 100 mev hard mode. The coupling constant, critical temperature, replica band are calculated. Although there exists a forward in the electron - phonon scattering peak, it is clearly not as sharp as assumed in recent theories (delta function - like). The satellite is broad and its peak appears at frequency much higher than the phonon frequency consistent with observations. Possible relation of the transverse counterpart of the surface LO soft mode with known phonons is discussed.

References in corpus (31)

• Correlated Electrons in High Temperature Superconductors
• Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3
• Phase Diagram and High Temperature Superconductivity at 65 K in Tuning Carrier Concentration of Single-Layer FeSe Films
• Interfacial mode coupling as the origin of the enhancement of Tc in FeSe films on SrTiO3
• Electronic Origin of High Temperature Superconductivity in Single-Layer FeSe Superconductor
• Magnetism and its microscopic origin in iron-based high-temperature superconductors
• Phonon-enhanced superconductivity at the FeSe/SrTiO3 interface
• Critical role of substrate in the high temperature superconductivity of single layer FeSe on Nb:BaTiO${}_3$
• Common Electronic Origin of Superconductivity in (Li,Fe)OHFeSe Bulk Superconductor and Single-Layer FeSe/SrTiO3 Films
• Monolayer FeSe on SrTiO${}_3$
• Plain s-wave superconductivity in single-layer FeSe on SrTiO3 probed by scanning tunneling microscopy
• Enhanced superconductivity due to forward scattering in FeSe thin films on SrTiO3 substrates
• Nodeless pairing in superconducting copper-oxide monolayer films on Bi2Sr2CaCu2O8+δ
• Universal Substrate Effect on the Superconductivity of FeSe Monolayer Films
• High-temperature superconductivity in single-unit-cell FeSe films on anatase TiO2(001)
• The Role of SrTiO3 Phonon Penetrating into thin FeSe Films in the Enhancement of Superconductivity
• Interface enhanced electron-phonon coupling and high temperature superconductivity in potassium-coated ultra-thin FeSe films on SrTiO3
• Observation of high-Tc superconductivity in rectangular FeSe/STO(110) monolayer
• Atomically Resolved FeSe/SrTiO3(001) Interface Structure by Scanning Transmission Electron Microscopy
• Interface high-temperature superconductivity
• Electron phonon coupling versus photoelectron energy loss at the origin of replica bands in photoemission of FeSe on SrTiO${}_3$
• Thickness dependence of superconductivity and superconductor-insulator transition in ultrathin FeSe films on SrTiO3(001) substrate
• Oxygen Vacancy Induced Flat Phonon Mode at FeSe /SrTiO3 interface
• Charge transfer and electron-phonon coupling in monolayer FeSe on Nb doped SrTiO${}_3$
• Multiband full-bandwidth anisotropic Eliashberg theory of interfacial electron-phonon coupling and high-T${}_c$ superconductivity in FeSe/SrTiO${}_3$
• Aspects of electron-phonon interactions with strong forward scattering in FeSe Thin Films on SrTiO${}_3$ substrates
• On peculiarities of superconductivity in the single-layer FeSe/SrTiO3 interfa
• Lattice Dynamics of Ultrathin FeSe Films on SrTiO3
• The electron-phonon interaction with forward scattering peak is a relevant approach to high Tc superconductivity in FeSe films on SrTiO3 and TiO2
• Superconductivity in 2D electron gas induced by high energy optical phonon mode and large polarization of the STO substrate
• Chiral universality class of the normal-superconducting and the exciton condensation transition on the surface of topological insulator

Cited by in corpus (5)

• Constrained-Path Auxiliary-Field Quantum Monte Carlo for Coupled Electrons and Phonons
• Possible enhancement of the superconducting $T_c$ due to sharp Kohn-like soft phonon anomalies
• Superconducting dome in ferroelectric-type materials from soft mode instability
• The phonon mechanism explanation of the superconductivity dichotomy between FeSe and FeS monolayers on STO and other substrates
• Exploring charge and spin fluctuations in infinite-layer cuprate SrCuO${}_2$ from a phonon perspective