Unusual band splitting and superconducting gap evolution with sulfur substitution in FeSe
arXiv:2204.08258 · doi:10.1088/0256-307X/39/5/057302
Abstract
High-resolution angle-resolved photoemission measurements were taken on FeSeS (x=0, 0.04, and 0.08) superconductors. With an ultrahigh energy resolution of 0.4 meV, unusual two hole bands near the Brillouin-zone center, which was possibly a result of additional symmetry breaking, were identified in all the sulfur-substituted samples. In addition, in both of the hole bands highly anisotropic superconducting gaps with resolution limited nodes were evidenced. We find that the larger superconducting gap on the outer hole band is reduced linearly to the nematic transition temperature while the gap on the inner hole is nearly S-substitution independent. Our observations strongly suggest that the superconducting gap increases with enhanced nematicity although the superconducting transition temperature is not only governed by the pairing strength, demonstrating strong constraints on theories in the FeSe family.
arXiv comment6 pages, 4 figures
References in corpus (40)
- High-temperature superconductivity in iron-based materials
- Observation of topological superconductivity on the surface of an iron-based superconductor
- Nematic Fermi Fluids in Condensed Matter Physics
- Symmetry breaking orbital anisotropy on detwinned Ba(Fe1-xCox)2As2 above the spin density wave transition
- The Structural Phase Transition in FeSe (Fe1+dSe)
- High Temperature Superconductivity in Iron Pnictides and Chalcogenides
- Orbital-driven nematicity in FeSe
- Discovery of Orbital-Selective Cooper Pairing in FeSe
- Emergence of the nematic electronic state in FeSe
- Strong Interplay between Stripe Spin Fluctuations, Nematicity and Superconductivity in FeSe
- Origin of the tetragonal-to-orthorhombic (nematic) phase transition in FeSe: a combined thermodynamic and NMR study
- Magnetic ground state of FeSe
- Pressure Induced Static Magnetic Order in Superconducting FeSe_1-x
- Nematic spin correlations in the tetragonal state of uniaxial strained BaFe2-xNixAs2
- Orbital selective pairing and gap structures of iron-based superconductors
- Superfluid density and specific heat within self-consistent scheme for two-band superconductor
- On the Remarkable Superconductivity of FeSe and its Close Cousins
- Suppression of orbital ordering by chemical pressure in FeSe1-xSx
- Two distinct superconducting pairing states divided by the nematic end point in FeSeS
- Superconducting properties of sulfur-doped iron selenide
- Universal moiré nematic phase in twisted graphitic systems
- Effect of an Electron-phonon Interaction on the One-electron Spectral Weight of a d-wave Superconductor
- Evolution of the Fermi surface of the nematic superconductors FeSe1-xSx
- Suppression of electronic correlations by chemical pressure from FeSe to FeS
- NMR Search for the Spin Nematic State in LaFeAsO Single Crystal
- Highly anisotropic and two-fold symmetric superconducting gap in nematically ordered FeSeS
- Evidence for time-reversal symmetry breaking of the superconducting state near twin-boundary interfaces in FeSe
- Preformed Cooper pairs in layered FeSe-based superconductors
- Nematic Pairing from Orbital Selective Spin Fluctuations in FeSe
- Orbital Origin of Extremely Anisotropic Superconducting Gap in Nematic Phase of FeSe Superconductor
- Orbital selectivity enhanced by nematic order in FeSe
- Scaling of the superconducting gap with orbital character in FeSe
- Nodal Superconducting Gap in -FeS
- Nematic orders in Iron-based superconductors
- A time- and angle-resolved photoemission spectroscopy with probe photon energy up to 6.7 eV
- Superconductivity-enhanced Nematicity and '' Gap Symmetry in Fe(SeS)
- Itinerant approach to magnetic neutron scattering of FeSe: effect of orbital selectivity
- Spin-Orbital-Intertwined Nematic State in FeSe
- Decoupled Pairing Amplitude and Electronic Coherence in Iron-Based Superconductors
- Evidence for an Additional Symmetry Breaking from Direct Observation of Band Splitting in the Nematic State of FeSe Superconductor