Scaling of the superconducting gap with orbital character in FeSe

Abstract

We use high-resolution angle-resolved photoemission spectroscopy to map the three-dimensional momentum dependence of the superconducting gap in FeSe. We find that on both the hole and electron Fermi surfaces, the magnitude of the gap follows the distribution of $d_{yz}$ orbital weight. Furthermore, we theoretically determine the momentum dependence of the superconducting gap by solving the linearized gap equation using a tight binding model which quantitatively describes both the experimental band dispersions and orbital characters. By considering a Fermi surface only including one electron pocket, as observed spectroscopically, we obtain excellent agreement with the experimental gap structure. Our finding of a scaling between the superconducting gap and the $d_{yz}$ orbital weight supports the interpretation of superconductivity mediated by spin-fluctuations in FeSe.

References in corpus (29)

• A Common Thread: the pairing interaction for the unconventional superconductors
• Gap symmetry and structure of Fe-based superconductors
• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• Discovery of Orbital-Selective Cooper Pairing in FeSe
• Emergence of the nematic electronic state in FeSe
• Normal-State Spin Dynamics and Temperature-Dependent Spin Resonance Energy in an Optimally Doped Iron Arsenide Superconductor
• Nematicity, magnetism and superconductivity in FeSe
• The key ingredients of the electronic structure of FeSe
• Momentum dependence of the superconducting gap in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Strong-coupling theory of superconductivity in a degenerate Hubbard model
• A facility for the analysis of the electronic structures of solids and their surfaces by synchrotron radiation photoelectron spectroscopy
• Orbital selective pairing and gap structures of iron-based superconductors
• Momentum-dependent sign-inversion of orbital polarization in superconducting FeSe
• Evidence for unidirectional nematic bond ordering in FeSe
• Imaging Orbital-selective Quasiparticles in the Hund's Metal State of FeSe
• Nodeless vs nodal order parameters in LiFeAs and LiFeP superconductors
• Impact of the 2 Fe unit cell on the electronic structure measured by ARPES in iron pnictides
• Effect of nematic ordering on electronic structure of FeSe
• Highly anisotropic and two-fold symmetric superconducting gap in nematically ordered FeSe${}_{0.93}$S${}_{0.07}$
• Electronic anisotropies revealed by detwinned ARPES measurements of FeSe
• Superconductivity in FeSe: the role of nematic order
• 3D superconducting gap in FeSe from ARPES
• Orbital Origin of Extremely Anisotropic Superconducting Gap in Nematic Phase of FeSe Superconductor
• Prominent role of spin-orbit coupling in FeSe
• Gap structure of FeSe determined by field-angle-resolved specific heat measurements
• Strongly enhanced temperature dependence of the chemical potential in FeSe
• Shifts and Splittings of the Hole Bands in the Nematic Phase of FeSe
• Revisit of the Orbital-Fluctuation-Mediated Superconductivity in LiFeAs: Nontrivial Spin-Orbit Interaction Effects on the Bandstructure and Superconducting Gap Function
• Fusion of bogoliubons in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ and similarity of energy scales in high temperature superconductors

Cited by in corpus (37)

• Ironing out the details of unconventional superconductivity
• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Nematic Pairing from Orbital Selective Spin Fluctuations in FeSe
• Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx
• Orbital selectivity in electron correlations and superconducting pairing of iron-based superconductors
• The relationship between transport anisotropy and nematicity in FeSe
• Spin-excitation anisotropy in the nematic state of detwinned FeSe
• Nodal gaps in the nematic superconductor FeSe from heat capacity
• Revealing the single electron pocket of FeSe in a single orthorhombic domain
• When superconductivity does not fear magnetism: Insight into electronic structure of RbEuFe${}_4$As${}_4$
• Separate tuning of nematicity and spin fluctuations to unravel the origin of superconductivity in FeSe
• Imaging anisotropic vortex dynamics in FeSe
• Itinerant approach to magnetic neutron scattering of FeSe: effect of orbital selectivity
• Non-local $d_{xy}$ nematicity and the missing electron pocket in FeSe
• Electronic nematicity in FeSe: a first-principles perspective
• Evidence of nodal gap structure in the basal plane of the FeSe superconductor
• $k_z$ selective scattering within Quasiparticle Interference measurements of FeSe
• Synergy between Hund-driven correlations and boson-mediated Superconductivity
• Vortex-lattice melting and paramagnetic depairing in the nematic superconductor FeSe
• Orbital transmutation and the electronic spectrum of FeSe in the nematic phase
• Raman response in the nematic phase of FeSe
• FeSe and the missing electron pocket problem
• Strongly correlated superconductor with polytypic 3D Dirac points
• Evidence for an Additional Symmetry Breaking from Direct Observation of Band Splitting in the Nematic State of FeSe Superconductor
• Relationships between Superconductivity and Nematicity in FeSe${}_{1-x}$Te${}_x$ ($x=0-0.5$) Films Studied by Complex Conductivity Measurements
• A Self-Adaptive First-Principles Approach for Magnetic Excited States
• Isostructural spin-density-wave and superconducting gap anisotropies in iron-arsenide superconductors
• Anisotropy of the DC conductivity due to orbital-selective spin fluctuations in the nematic phase of iron superconductors
• Resurgence of superconductivity and the role of $d_{xy}$ hole band in FeSe${}_{1-x}$Te${}_x$
• In-plane p-wave coherence length in iron-based superconductors
• Specific heat in strongly hole-doped Iron-based superconductors
• Unusual band splitting and superconducting gap evolution with sulfur substitution in FeSe
• Sub-kelvin Andreev reflection spectroscopy of superconducting gaps in FeSe
• Feedback of non-local $d_{xy}$ nematicity on the magnetic anisotropy in FeSe
• Microscopic Description of Unconventional Nodal Superconductivity in FeSe
• Short-lived electron excitations in $\mathrm{FeT}{\mathrm{e}}_{1-\mathrm{x}}\mathrm{S}{\mathrm{e}}_{\mathrm{x}}$ as revealed by microwave absorption
• Resistivity anisotropy from the multiorbital Boltzmann equation in nematic FeSe