Neutron Spin Resonance Near a Lifshitz Transition in Overdoped BaKFeAs
arXiv:2505.11000 · doi:10.1088/0256-307X/42/6/067405
Abstract
Elucidating the relationship between spin excitations and fermiology is essential for clarifying the pairing mechanism in iron-based superconductors (FeSCs). Here, we report inelastic neutron scattering results on the hole overdoped BaKFeAs near a Lifshitz transition, where the electron pocket at point is nearly replace by four hole pockets. In the normal state, the spin excitations are observed at incommensurate wave vectors with chimney-like dispersions. By cooling down to the superconducting state, a neutron spin resonance mode emerges with a peak energy of 14-15 meV weakly modulated along -direction. The incommensurability notably increases at low energies, giving rise to downward dispersions of the resonance mode. This behavior contrasts sharply with the upward dispersions of resonance observed in optimally doped BaKFeAs contributed by the hole to electron scattering, but resembles with the cases in KFeAs and KCaFeAsF where the fermiology are dominated by hole pockets. These results highlight the critical role of electronic structure modifications near the Fermi level, especially in governing interband scattering under imperfect nesting conditions, which fundamentally shape the spin dynamics of FeSCs.
arXiv comment7 pages, 4 figures, Accepted by Chinese Physics Letters as Express Letter
References in corpus (49)
- Advanced capabilities for materials modelling with Quantum ESPRESSO
- Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
- Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsOF}
- A Common Thread: the pairing interaction for the unconventional superconductors
- Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
- Antiferromagnetic order and spin dynamics in iron-based superconductors
- Strong Correlations and Magnetic Frustration in the High Tc Iron Pnictides
- Electronic Origin of High Temperature Superconductivity in Single-Layer FeSe Superconductor
- Magnetism and its microscopic origin in iron-based high-temperature superconductors
- Heavily electron-doped electronic structure and isotropic superconducting gap in AxFe2Se2 (A=K,Cs)
- Pairing Symmetry in a Two-Orbital Exchange Coupling Model of Oxypnictides
- The effect of collective spin-1 excitations on electronic spectra in high-Tc superconductors
- Ironing out the details of unconventional superconductivity
- Progress in Neutron Scattering Studies of Spin Excitations in High-Tc Cuprates
- Common Electronic Origin of Superconductivity in (Li,Fe)OHFeSe Bulk Superconductor and Single-Layer FeSe/SrTiO3 Films
- d-wave pairing from spin fluctuations in the KxFe{2-y}Se2 superconductors
- Evidence of Strong Correlations and Coherence-Incoherence Crossover in the Iron Pnictide Superconductor KFe2As2
- Superconductivity-induced reentrance of orthorhombic distortion in Ba1-xKxFe2As2
- Exotic d-wave superconductivity in strongly hole doped K(x)Ba(1-x)Fe2As2
- The Electron Pairing of KFeSe
- Growth and characterization of A_{1-x}K_xFe_2As_2 (A = Ba, Sr) single crystals with x=0 - 0.4
- A magnetic origin for high temperature superconductivity in iron pnictides
- Neutron Scattering Resonance and the Fe-pnictide Superconducting Gap
- Emerging superconductivity with broken time reversal symmetry inside a superconducting -wave state
- Fermi surface and mass enhancement in KFeAs from de Haas-van Alphen effect measurements
- Universality of superconducting gaps in overdoped Ba0.3K0.7Fe2As2 observed by angle-resolved photoemission spectroscopy
- Possible nodal superconducting gap emerging at the Lifshitz transition in heavily hole-doped Ba0.1K0.9Fe2As2
- Incommensurate spin fluctuations in hole-overdoped superconductor KFe2As2
- Reciprocal-space structure and dispersion of the magnetic resonant mode in the superconducting phase of Rb(x)Fe(2-y)Se2 single crystals
- Strong Correlations, Strong Coupling and s-wave Superconductivity in Hole-doped BaFe2As2 Single Crystals
- Effect of Fermi Surface Nesting on Resonant Spin Excitations in Ba1-xKxFe2As2
- Superconductivity with broken time reversal symmetry in ion irradiated BaKFeAs single crystals
- Abrupt change in the energy gap of superconducting Ba1-xKxFe2As2 single crystals with hole doping
- Observation of superconducting vortices carrying a temperature-dependent fraction of the flux quantum
- Fermi surface in KFe2As2 determined via de Haas-van Alphen oscillation measurements
- Neutron spin resonance in a quasi-two-dimensional iron-based superconductor
- Structure of spin excitations in heavily electron-doped Li0.8Fe0.2ODFeSe superconductors
- Two energy scales in the magnetic resonance spectrum of electron and hole doped pnictide superconductors
- Neutron spin resonance in the 112-type iron-based superconductor
- Universality of dispersive spin-resonance mode in superconducting BaFe2As2
- Magnonlike dispersion of spin resonance in Ni-doped BaFeAs
- (PI,0) antiferromagnetic spin excitations in superconducting Rb0.82Fe1.68Se2
- Suppression of spin-exciton state in hole overdoped iron-based superconductors
- Spin excitations in hole-overdoped iron-based superconductors
- Neutron Spin Resonance in the Heavily Hole-doped KFeAs Superconductor
- Neutron spin resonance as a probe of Fermi surface nesting and superconducting gap symmetry in BaK(FeCo)As
- Strong Spin Resonance Mode associated with suppression of soft magnetic ordering in Hole-doped Ba1-xNaxFe2As2
- Genuine Electronic Structure and Superconducting Gap Structure in (BaK)FeAs Superconductor
- Spin correlations in the parent phase of LiFeODFeSe