3D superconducting gap in FeSe from ARPES

Abstract

We present a systematic angle-resolved photoemission spectroscopy study of the superconducting gap in FeSe. The gap function is determined in a full Brillouin zone including all Fermi surfaces and kz-dependence. We find significant anisotropy of the superconducting gap in all momentum directions. While the in-plane anisotropy can be explained by both, nematicity-induced pairing anisotropy and orbital-selective pairing, the kz-anisotropy requires additional refinement of theoretical approaches.

arXiv commentMain text: 6 pages, 4 figures; Supplemental Material: 2 pages, 1 figure

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Cited by in corpus (41)

• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Nematic Pairing from Orbital Selective Spin Fluctuations in FeSe
• Superconductivity in FeSe: the role of nematic order
• Orbital Origin of Extremely Anisotropic Superconducting Gap in Nematic Phase of FeSe Superconductor
• Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx
• Scaling of the superconducting gap with orbital character in FeSe
• Orbital selectivity in electron correlations and superconducting pairing of iron-based superconductors
• Enhanced critical temperature, pairing fluctuation effects, and BCS-BEC crossover in a two-band Fermi gas
• Influence of Spin Orbit Coupling in the Iron-Based Superconductors
• Nodal gaps in the nematic superconductor FeSe from heat capacity
• Revealing the single electron pocket of FeSe in a single orthorhombic domain
• Unconventional density waves and superconductivities in Fe-based superconductors and other strongly correlated electron systems
• Time-reversal symmetry-breaking nematic superconductivity in FeSe
• Orbital order in FeSe - the case for vertex renormalization
• Itinerant approach to magnetic neutron scattering of FeSe: effect of orbital selectivity
• Observation of the in-plane magnetic field-induced phase transitions in FeSe
• Separate tuning of nematicity and spin fluctuations to unravel the origin of superconductivity in FeSe
• Spin-Orbital-Intertwined Nematic State in FeSe
• Electronic nematicity in FeSe: a first-principles perspective
• Non-local $d_{xy}$ nematicity and the missing electron pocket in FeSe
• Evidence of nodal gap structure in the basal plane of the FeSe superconductor
• The Triplet Resonating Valence Bond State and Superconductivity in Hund's Metals
• The drastic effect of the impurity scattering on the electronic and superconducting properties of Cu-doped FeSe
• $k_z$ selective scattering within Quasiparticle Interference measurements of FeSe
• Synergy between Hund-driven correlations and boson-mediated Superconductivity
• Orbital transmutation and the electronic spectrum of FeSe in the nematic phase
• FeSe and the missing electron pocket problem
• Mechanism of screening or enhancing the pseudogap throughout the two-band Bardeen-Cooper-Schrieffer to Bose-Einstein condensate crossover
• Twisted-bilayer FeSe and the Fe-based superlattices
• ${}^{77}$Se-NMR Study under Pressure on 12%-S Doped FeSe
• Strongly correlated superconductor with polytypic 3D Dirac points
• Pressure-induced reconstitution of Fermi surfaces and spin fluctuations in S-substituted FeSe
• Multi-band description of the upper critical field of bulk FeSe
• Evidence for an Additional Symmetry Breaking from Direct Observation of Band Splitting in the Nematic State of FeSe Superconductor
• Nematic state of the FeSe superconductor
• Anisotropy of the DC conductivity due to orbital-selective spin fluctuations in the nematic phase of iron superconductors
• Orbital-dependent electron dynamics in Fe-pnictide superconductors
• Atomic scale imaging of sign-changing order parameter in superconducting FeSe with Tunneling Andreev Reflection
• Sub-kelvin Andreev reflection spectroscopy of superconducting gaps in FeSe
• Resistivity anisotropy from the multiorbital Boltzmann equation in nematic FeSe
• Feedback of non-local $d_{xy}$ nematicity on the magnetic anisotropy in FeSe