Superconductivity and phonon self-energy effects in Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$

Abstract

We study Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$ multi-band superconductor with $T_c=14$K by polarization-resolved Raman spectroscopy. Deep in the superconducting state, we detect pair-breaking excitation at 45cm${}^{-1}$ ($2\Delta =5.6$meV) in the $XY$($B_{2g}$) scattering geometry, consistent with twice of the superconducting gap energy (3 meV) revealed by ARPES on the hole-like Fermi pocket with $d_{xz}/d_{yz}$ character. We analyze the superconductivity induced phonon self-energy effects for the $B_{1g}$(Fe) phonon and estimate the electron-phonon coupling constant ${\lambda }^{\Gamma }\approx 0.026$, which is insufficient to explain superconductivity with $T_c=14$K.

References in corpus (39)

• High-temperature superconductivity in iron-based materials
• Nematic order in iron superconductors - who is in the driver's seat?
• Antiferromagnetic order and spin dynamics in iron-based superconductors
• Observation of topological superconductivity on the surface of an iron-based superconductor
• Inelastic Light Scattering From Correlated Electrons
• Superconductivity close to magnetic instability in Fe(Se1-xTex)0.82
• Reply to Comment on "Unconventional s-wave superconductivity in Fe(Se,Te)"
• High Temperature Superconductivity in Iron Pnictides and Chalcogenides
• Orbital-driven nematicity in FeSe
• Ubiquitous signatures of nematic quantum criticality in optimally doped Fe-based superconductors
• Multiple topological states in iron-based superconductors
• Observation of a Robust Zero-energy Bound State in Iron-based Superconductor Fe(Te,Se)
• Spin Gap and Resonance at the Nesting Wavevector in Superconducting FeSe0.4Te0.6
• Nematic spin correlations in the tetragonal state of uniaxial strained BaFe2-xNixAs2
• Observation of incipient charge nematicity in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Using Gap Symmetry and Structure to Reveal the Pairing Mechanism in Fe-based Superconductors
• Low-energy microscopic models for iron-based superconductors: a review
• Isotropic superconducting gaps with enhanced pairing on electron Fermi surfaces in FeTe0.55Se0.45
• Electronic nematic susceptibility of iron-based superconductors
• Charge Nematicity and Electronic Raman Scattering in Iron-based Superconductors
• Charge induced nematicity in FeSe
• Band and momentum dependent electron dynamics in superconducting $\mathrm{Ba}(\mathrm{F}{\mathrm{e}}_{1-\mathrm{x}}\mathrm{C}{\mathrm{o}}_{\mathrm{x}}{)}_2\mathrm{A}{\mathrm{s}}_2$ as seen via electronic Raman scattering
• Critical Quadrupole Fluctuations and Collective Modes in Iron Pnictide Superconductors
• Nematic fluctuations and the magneto-structural phase transition in $\mathrm{Ba}(\mathrm{F}{\mathrm{e}}_{1-\mathrm{x}}\mathrm{C}{\mathrm{o}}_{\mathrm{x}}{)}_2\mathrm{A}{\mathrm{s}}_2$
• Electronic correlations and unusual superconducting response in the optical properties of the iron-chalcogenide FeTe0.55Se0.45
• Phonon, Two-Magnon and Electronic Raman Scattering of Fe1+yTe1-xSex
• Anomalous optical phonons in FeTe pnictides: spin state, magnetic order, and lattice anharmonicity
• A balancing act: Evidence for a strong subdominant d-wave pairing channel in $\mathrm{B}{\mathrm{a}}_{0.6}{\mathrm{K}}_{0.4}\mathrm{F}{\mathrm{e}}_2\mathrm{A}{\mathrm{s}}_2$
• NMR evidence for inhomogeneous nematic fluctuations in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Nematic resonance in the Raman response of iron-based superconductors
• ARPES measurements of the superconducting gap of Fe-based superconductors and their implications to the pairing mechanism
• Impact of the Spin Density Wave Order on the Superconducting Gap of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Anomalous dependence of the c-axis polarized Fe B${}_{1g}$ phonon mode with Fe and Se concentrations in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Anharmonicity and self-energy effects of the E2g phonon in MgB2
• Self-energy effects and electron-phonon coupling in Fe-As superconductors
• Multi-Gap Superconductivity in MgB2: Magneto-Raman Spectroscopy
• Superconductivity and electronic fluctuations in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ studied by Raman scattering
• High Tc superconductivity in CaKFe${}_4$As${}_4$ in absence of nematic fluctuations
• Superconductivity-induced Phonon Renormalization on NaFe${}_{1-x}$Co${}_x$As

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