Detection of bosonic mode as a signature of magnetic excitation in one unit cell FeSe on SrTiO3

Abstract

We report an in situ scanning tunneling spectroscopy study of one-unit-cell (1-UC) FeSe film on SrTiO3(001) (STO) substrate. In quasiparticle density of states, bosonic excitation mode characterized by the "dip-hump" structure is detected outside the larger superconducting gap with energy comparable with phonon and spin resonance modes in heavily electron-doped iron selenides. Statistically, the excitation mode, which is intimately correlated with superconductivity, shows an anticorrelation with pairing strength and yields an energy scale upper-bounded by twice the superconducting gap coinciding with the characteristics of magnetic resonance in cuprates and iron-based superconductors. The local response of tunneling spectra to magnetically different Se defects all exhibits the induced in-gap quasiparticle bound states, indicating an unconventional sign-reversing pairing. These results support the magnetic nature of the excitation mode and possibly reveal a signature of electron-magnetic-excitation coupling in high-temperature superconductivity of 1-UC FeSe/STO.

References in corpus (55)

• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3
• Superconductivity in single-layer films of FeSe with a transition temperature above 100 K
• 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
• Imaging the Effects of Individual Zinc Impurity Atoms on Superconductivity in Bi2Sr2CaCu2O8+delta
• Interface-induced superconductivity and strain-dependent spin density wave in FeSe/SrTiO3 thin films
• Electronic Origin of High Temperature Superconductivity in Single-Layer FeSe Superconductor
• Interplay of electron-lattice interactions and superconductivity in Bi2Sr2CaCu2O8+d
• Interplay of magnetism and high-Tc superconductivity at individual Ni impurity atoms in Bi2Sr2CaCu2O8+d
• The effect of collective spin-1 excitations on electronic spectra in high-Tc superconductors
• Direct observation of high temperature superconductivity in one-unit-cell FeSe films
• Phonon-enhanced superconductivity at the FeSe/SrTiO3 interface
• Common Electronic Origin of Superconductivity in (Li,Fe)OHFeSe Bulk Superconductor and Single-Layer FeSe/SrTiO3 Films
• Plain s-wave superconductivity in single-layer FeSe on SrTiO3 probed by scanning tunneling microscopy
• Correlation of Tunneling Spectra in Bi2Sr2CaCu2O(8+delta) with the Resonance Spin Excitation
• Inter-pocket pairing and gap symmetry in Fe-based superconductors with only electron pockets
• Surface electronic structure and isotropic superconducting gap in (Li${}_{0.8}$Fe${}_{0.2}$)OHFeSe
• Origin of the peak-dip-hump structure in the photoemission spectra of Bi2212
• Observation of Double-Dome Superconductivity in Potassium-Doped FeSe Thin Films
• High temperature superconducting FeSe films on SrTiO3 substrates
• Superconducting gap anisotropy in monolayer FeSe thin film
• Symmetry analysis of possible superconducting states in KxFe2Se2 superconductors
• What makes the Tc of monolayer FeSe on SrTiO3 so high: a sign-problem-free quantum Monte Carlo study
• The Role of SrTiO3 Phonon Penetrating into thin FeSe Films in the Enhancement of Superconductivity
• Large electron-phonon interactions from FeSe phonons in a monolayer
• Interface enhanced electron-phonon coupling and high temperature superconductivity in potassium-coated ultra-thin FeSe films on SrTiO3
• A distinct bosonic mode in an electron-doped high-transition-temperature superconductor
• Scanning tunneling spectroscopy of superconducting LiFeAs single crystals: Evidence for two nodeless energy gaps and coupling to a bosonic mode
• High-temperature superconductivity in one-unit-cell FeSe films
• Experimental Demonstration of the Sign Reversal of the Order Parameter in (Li1-xFex)OHFe1-yZnySe
• Close relationship between superconductivity and the bosonic mode in Ba0.6K0.4Fe2As2 and Na(Fe0.975Co0.025)As
• Resilient nodeless $d$-wave superconductivity in monolayer FeSe
• Evidence of a spin resonance mode in the iron-based superconductor Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ from scanning tunneling spectroscopy
• Superconductivity in FeSe thin films driven by the interplay between nematic fluctuations and spin-orbit coupling
• Surface electronic structure and evidence of plain s-wave superconductivity in (Li0.8Fe0.2)OHFeSe
• Electron phonon coupling versus photoelectron energy loss at the origin of replica bands in photoemission of FeSe on SrTiO${}_3$
• Persistence of Strong Electron Coupling to a Narrow Boson Spectrum in Overdoped BiSrCaCuO (Bi2212) Tunneling Data
• Bound States of Defects in Superconducting LiFeAs Studied by Scanning Tunneling Spectroscopy
• Thickness dependence of superconductivity and superconductor-insulator transition in ultrathin FeSe films on SrTiO3(001) substrate
• In-Gap Quasiparticle Excitations Induced by Non-Magnetic Cu Impurities in Na(Fe0.96Co0.03Cu0.01)As Revealed by Scanning Tunneling Spectroscopy
• Imaging the essential role of spin-fluctuations in high-Tc superconductivity
• Local quasiparticle density of states of superconducting SmFeAsO$1-x$F$x$ single crystals: Evidence for spin-mediated pairing
• Imaging the Electron-Boson Coupling in Superconducting FeSe
• Structure of spin excitations in heavily electron-doped Li0.8Fe0.2ODFeSe superconductors
• Local Strong Coupling Pairing in $D$-Wave Superconductor with Inhomogeneous Bosonic Modes
• Role of Inelastic Tunneling through the Barrier in Scanning Tunneling Microscope Experiments on Cuprates
• Imaging the Real Space Structure of the Spin Fluctuations in an Iron-based superconductor
• Superconductivity without hole-pocket in electron-doped FeSe: Analysis beyond the Migdal-Eliashberg formalism
• Phonon splitting and anomalous enhancement of infrared-active modes in BaFe${}_2$As${}_2$
• An extensive impurity-scattering study on the pairing symmetry of monolayer FeSe films on SrTiO3
• Impurity-induced bound states inside the superconducting gap of FeSe
• Density of States Modulations from Oxygen Phonons in d-wave Superconductors: Reconciling Angle-Resolved Photoemission Spectroscopy and Scanning Tunneling Microscopy
• Possible spin excitation structure in monolayer FeSe grown on SrTiO${}_3$

Cited by in corpus (18)

• Discovery of a pair density wave state in a monolayer high-Tc iron-based superconductor
• Observation of superconducting collective modes from competing pairing instabilities in single-layer NbSe${}_2$
• Heterostructural one-unit-cell FeSe/SrTiO3: from high-temperature superconductivity to topological states
• Tuning stoichiometry and its impact on superconductivity of monolayer and multilayer FeSe on SrTiO3
• Emergent vortex Majorana zero mode in iron-based superconductors
• Multichannel superconductivity of monolayer FeSe on SrTiO${}_3$: Interplay of spin fluctuations and electron-phonon interaction
• Evidence of a distinct collective mode in Kagome superconductors
• Direct probing of a large spin-orbit coupling in the FeSe superconducting monolayer on STO: Evidence for nontrivial topological states
• The study of intrinsic defect state of FeSe with scanning tunneling microscopy
• Checkerboard order state in superconducting FeSe/SrTiO3(001) monolayer
• Orbital-Selective High-Temperature Cooper Pairing Developed in the Two-Dimensional Limit
• Superconductivity of the FeSe/SrTiO3 Interface in the View of BCS-BEC Crossover
• Direct evidence of a charge depletion region at the interface of Van der Waals monolayers and dielectric oxides: The case of superconducting FeSe/STO
• Lateral quantum confinement effect on monolayer high-Tc superconductors
• Capping layer influence and isotropic in-plane upper critical field of the superconductivity at the FeSe/SrTiO3 interface
• Dynamical Coulomb Blockade as a Signature of the Sign-Reversing Cooper Pairing Potential
• Temperature evolution of the Fermi surface of the FeSe monolayer on SrTiO${}_3$
• Spectroscopic evidence of disorder-induced quantum phase transitions in monolayer Fe(Te,Se) superconductor