Two distinct superconducting pairing states divided by the nematic end point in FeSe${}_{1-x}$S${}_x$

Abstract

Unconventional superconductivity often competes or coexists with other electronic orders. In iron-based superconductors, relationship between superconductivity and the nematic state, where the lattice rotational symmetry is spontaneously broken in the electronic states, has been discussed but unclear. Using spectroscopic-imaging scanning tunneling microscopy, we investigate how the band structure and the superconducting gap evolve in FeSe${}_{1-x}$S${}_x$, as the sulfur substitution suppresses nematicity that eventually diminishes at the nematic end point (NEP) at $x=0.17$. Anisotropic quasiparticle-interference patterns, which represent the nematic band structure, gradually become isotropic with increasing $x$ without detectable anomalies in the band parameters at the NEP. By contrast, the superconducting gap, which is almost intact in the nematic phase, suddenly shrinks as soon as $x$ exceeds the NEP. Our observation implies that the presence or absence of nematicity results in two distinct pairing states, whereas the pairing interaction is insensitive to the strength of nematicity. This provides a clue for understanding the pairing mechanism.

9 pages, 4 figures. Supplementary information is available at http://www.riken.jp/epmrt/Hanaguri/SI/FeSeS_QPI_SI.pdf

References in corpus (39)

• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• Nematic order in iron superconductors - who is in the driver's seat?
• LaFeAsO${}_{1-x}$F${}_x$: A low carrier density superconductor near itinerant magnetism
• Gap symmetry and structure of Fe-based superconductors
• Superconductivity at 36 K in beta-Fe1.01Se with the compression of the interlayer separation under pressure
• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• An Intrinsic Bond-Centered Electronic Glass with Unidirectional Domains in Underdoped Cuprates
• Imaging Quasiparticle Interference in Bi2Sr2CaCu2O8+d
• Orbital Fluctuation Mediated Superconductivity in Iron Pnictides: Analysis of Five Orbital Hubbard-Holstein Model
• Intra-unit-cell electronic nematicity of the high-Tc copper-oxide pseudogap states
• Nematic and meta-nematic transitions in the iron pnictides
• Field-induced superconducting phase of FeSe in the BCS-BEC cross-over
• Discovery of Orbital-Selective Cooper Pairing in FeSe
• Emergence of the nematic electronic state in FeSe
• Substitution Effects on FeSe Superconductor
• A review of Fe-chalcogenide superconductors: the simplest Fe-based superconductor
• Quasiparticle Scattering Interference in High Temperature Superconductors
• Dome-shaped magnetic order competing with high-temperature superconductivity at high pressures in FeSe
• Reconstruction of Band Structure Induced by Electronic Nematicity in an FeSe Superconductor
• Lack of coupling between superconductivity and orthorhombic distortion in stoichiometric single-crystalline FeSe
• Lifting of xz/yz orbital degeneracy at the structural transition in detwinned FeSe
• Nematic quantum critical point without magnetism in FeSe1-xSx superconductors
• Unusual band renormalization in the simplest iron based superconductor
• Orbital selective pairing and gap structures of iron-based superconductors
• Momentum-dependent sign-inversion of orbital polarization in superconducting FeSe
• Maximizing Tc by tuning nematicity and magnetism in FeSe1-xSx superconductors
• Evidence for unidirectional nematic bond ordering in FeSe
• Two types of s-wave pairing due to magnetic and orbital fluctuations in the two-dimensional 16-band d-p model for iron-based superconductors
• Suppression of orbital ordering by chemical pressure in FeSe1-xSx
• Highly Anisotropic Superconducting Gap in Nematically Ordered and Tetragonal Phases of FeSe${}_{1-x}$S${}_x$
• Suppression of electronic correlations by chemical pressure from FeSe to FeS
• Effect of nematic ordering on electronic structure of FeSe
• Highly anisotropic and two-fold symmetric superconducting gap in nematically ordered FeSe${}_{0.93}$S${}_{0.07}$
• Orbital Order, Structural Transition and Superconductivity in Iron Pnictides
• Orbital fluctuation theory in iron-based superconductors: s-wave superconductivity, structure transition, and impurity-induced nematic order
• Nodal Superconducting Gap in $\beta$-FeS
• Evidence for Orbital Order and its Relation to Superconductivity in FeSe0.4Te0.6
• Imaging anomalous nematic order and strain in optimally doped BaFe${}_2$(As,P)${}_2$

Cited by in corpus (75)

• Nematicity, magnetism and superconductivity in FeSe
• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Exotic Superconducting States in FeSe-based Materials
• Evidence for an FFLO state with segmented vortices in the BCS-BEC-crossover superconductor FeSe
• Evolution of the Fermi surface of the nematic superconductors FeSe1-xSx
• Quantum vortex core and missing pseudogap in the multi-band BCS-BEC-crossover superconductor FeSe
• Quenched nematic criticality separating two superconducting domes in an iron-based superconductor under pressure
• Superconductivity in FeSe: the role of nematic order
• Topological Ultranodal pair states in iron-based superconductors
• Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx
• Pure nematic quantum critical point accompanied by a superconducting dome
• Bogoliubov Fermi Surfaces in Spin-1/2 Systems: Model Hamiltonians and Experimental Consequences
• Non-Fermi liquid transport in the vicinity of nematic quantum critical point of FeSe${}_{1-x}$S${}_x$ superconductor
• Anomalous high-magnetic field electronic state of the nematic superconductors FeSe${}_{1-x}$S${}_x$
• Thermodynamics of transition to BCS-BEC crossover superconductivity in FeSe${}_{1-x}$S${}_x$
• Visualizing nematic transition and nanoscale suppression of superconductivity in Fe(Te,Se)
• Time-reversal symmetry-breaking nematic superconductivity in FeSe
• Two-dome superconductivity in FeS induced by a Lifshitz transition
• Two superconducting states with broken time-reversal symmetry in FeSe1-xSx
• Hydrothermal synthesis and complete phase diagram of FeSe${}_{1-x}$S${}_x$ $(0\le x\le 1)$ single crystals
• Growth of superconducting epitaxial films of sulfur substituted FeSe via pulsed laser deposition
• Non-local $d_{xy}$ nematicity and the missing electron pocket in FeSe
• Enhanced superconducting pairing strength near a nonmagnetic nematic quantum critical point
• Superconductivity Mediated by Nematic Fluctuations in Tetragonal $\text{Fe}{\text{Se}}_{1-x}{\text{S}}_x$
• Spontaneous orbital polarization in the nematic phase of FeSe
• Quasiparticle Nodal Plane in the Fulde-Ferrell-Larkin-Ovchinnikov State of FeSe
• Impact of Nematicity on the Relationship between Antiferromagnetic Fluctuations and Superconductivity in FeSe0.91S0.09 Under Pressure
• Electronic transport properties and hydrostatic pressure effect of FeSe${}_{0.67}$Te${}_{0.33}$ single crystals free of phase separation
• Lattice-Shifted Nematic Quantum Critical Point in FeSe${}_{1-x}$S${}_x$
• $k_z$ selective scattering within Quasiparticle Interference measurements of FeSe
• Close correlation between superconducting transition temperatures and carrier densities in Te- and S-substituted FeSe thin films
• Disorder-robust high-field superconducting phase of FeSe single crystals
• FeSe and the missing electron pocket problem
• Superconducting FeSe monolayer with milli-electron volt Fermi energy
• Extended Magnetic Dome Induced by Low Pressures in Superconducting FeSe${}_{1\text{-}\mathrm{x}}$S${}_{\mathrm{x}}$
• Orientational order parameters for arbitrary quantum systems
• Pressure-induced reconstitution of Fermi surfaces and spin fluctuations in S-substituted FeSe
• On the nature of quasiparticle interference in three dimensions
• Spin fluctuations from Bogoliubov Fermi surfaces in the superconducting state of S-substituted FeSe
• Multi-band description of the upper critical field of bulk FeSe
• Relationships between Superconductivity and Nematicity in FeSe${}_{1-x}$Te${}_x$ ($x=0-0.5$) Films Studied by Complex Conductivity Measurements
• Quadrupolar charge dynamics in the nonmagnetic FeSe${}_{1-x}$S${}_x$ superconductors
• Direct comparison of ARPES, STM, and quantum oscillation data for band structure determination in Sr${}_2$RhO${}_4$
• Interrelationships between nematicity, antiferromagnetic spin fluctuations and superconductivity: Role of hotspots in FeSe${}_{1-x}$S${}_x$ revealed by high pressure ${}^{77}$Se NMR study
• Surface density of states and tunneling spectroscopy of a spin-3/2 superconductor with Bogoliubov Fermi Surfaces
• Nematic Bogoliubov Fermi surfaces from magnetic toroidal order in FeSe${}_{1-x}$S${}_x$
• Electronic Stripe Patterns Near the Fermi Level of Tetragonal Fe(Se,S)
• Unveiling non-Abelian statistics of vortex Majorana bound states in iron-based superconductors using fermionic modes
• Quasi-one Dimensional Nanostructures as Sign of Nematicity in Iron Pnictides and Chalcogenides
• Multi-Atom Quasiparticle Scattering Interference for Superconductor Energy-Gap Symmetry Determination
• Microscopic origin of ultranodal superconducting states in spin-1/2 systems
• Lifshitz transition enabling superconducting dome around the quantum critical point in TiSe${}_2$
• Impurity effect on Bogoliubov Fermi surfaces: Analysis based on iron-based superconductors
• Orbital selectivity versus Pomeranchuk instability in the iron-chalcogenide superconductors: A two-loop renormalization group study
• Nematic properties of FeSe${}_{1-x}$Te${}_x$ crystals with a low Te content
• Unveiling the quasiparticle behaviour in the pressure-induced high-$T_c$ phase of an iron-chalcogenide superconductor
• Dynamical effects on superconductivity in BCS-BEC crossover
• Unusual band splitting and superconducting gap evolution with sulfur substitution in FeSe
• Lifting of gap nodes by disorder in ultranodal superconductor candidate FeSe1-xSx
• Exotic heavy fermion superconductivity in atomically thin CeCoIn${}_5$ films
• Fulde-Ferrell-Larkin-Ovchinnikov State in Perpendicular Magnetic Fields in Strongly Pauli-Limited Quasi-Two-Dimensional Superconductors
• Spin fluctuations in the ultranodal superconducting state of Fe(Se,S)
• Intrinsic pinning of FeSe${}_1$${}_{-}$${}_x$S${}_x$ single crystals probed by torque magnetometry
• Studies of superconductivity of Fe chalcogenides in films grown by PLD technique
• Impact of atomic defects in the electronic states of FeSe${}_{1-x}$S${}_x$ superconducting crystals
• Landau-Level Quantization and Band Splitting of FeSe Monolayers Revealed by Scanning Tunneling Spectroscopy
• Image of helical local moment magnetic order in the STM spectrum
• The interactions between antiferromagnetism, tetrahedral sites and electron-phonon coupling in FeSe1-xTex and FeSe/SrTiO3
• Crossover of Superconductivity across the antiferromagnetic end point in FeSe${}_{1-\mathrm{x}}$S${}_{\mathrm{x}}$ under pressure
• Quasiparticle interaction originating from Bogoliubov Fermi Surfaces under pressure in 18%-S substituted FeSe studied via NMR
• Q Dependence of Magnetic Resonance Mode on FeTe${}_{0.5}$Se${}_{0.5}$ Studied by Inelastic Neutron Scattering
• Superconductivity near an Ising nematic quantum critical point in two dimensions
• Depairing critical current density and the vortex-free state in FeSe nanobridges
• Evolution and Instability of Bogoliubov Fermi Surfaces under Zeeman Field
• Thermoelectric effect in a superconductor with Bogoliubov Fermi surfaces