A magnetic origin for high temperature superconductivity in iron pnictides

Abstract

In conventional Bardeen-Cooper-Schrieffer (BCS) superconductors, superconductivity occurs when electrons form coherent Cooper pairs below the superconducting transition temperature Tc. Although the kinetic energy of paired electrons increases in the superconducting state relative to the normal state, the reduction in the ion lattice energy is sufficient to give the superconducting condensation energy. For iron pnictide superconductors derived from electron or hole doping of their antiferromagnetic (AF) parent compounds, the microscopic origin for supercnductivity is unclear. Here we use neutron scattering to show that high-Tc superconductivity only occurs for iron pnictides with low-energy itinerant electron-spin excitation coupling and high energy spin excitations. Since our absolute spin susceptibility measurements for optimally hole-doped iron pnictide reveal that the change in magnetic exchange energy below and above Tc can account for the superconducting condensation energy, we conclude that the presence of both high-energy spin excitations giving rise to a large magnetic exchange coupling J and low-energy spin excitations coupled to the itinerant electrons is essential for high-Tc superconductivity in iron pnictides.

9 pages, 4 figures in the main article; 11 pages, 13 figures in the supplementary materials

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Cited by in corpus (81)

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• Interfacial mode coupling as the origin of the enhancement of Tc in FeSe films on SrTiO3
• Ironing out the details of unconventional superconductivity
• Iron based high transition temperature superconductors
• Spin dynamics and an orbital-antiphase pairing symmetry in iron-based superconductors
• Spin fluctuations in iron pnictides and chalcogenides: From antiferromagnetism to superconductivity
• Magnetic interactions in iron superconductors: A review
• Resonance from antiferromagnetic spin fluctuations for superconductivity in UTe${}_2$
• How correlated is the FeSe/SrTiO${}_3$ system ?
• Evolution of spin excitations from bulk to monolayer FeSe
• Unified phase diagram for iron-based superconductors
• Enhancing magnetic stripe order in iron pnictides by RKKY exchange interactions
• Odd and even modes of neutron spin resonance in the bilayer iron-based superconductor CaKFe${}_4$As${}_4$
• The magnitude of the magnetic exchange interaction in the heavy fermion antiferromagnet CeRhIn${}_5$
• Orbital selective spin excitations and their impact on superconductivity of LiFe1-xCoxAs
• Structure of spin excitations in heavily electron-doped Li0.8Fe0.2ODFeSe superconductors
• Spin-excitation anisotropy in the nematic state of detwinned FeSe
• Evidences of Mott physics in iron pnictides from x-ray spectroscopy
• Coexistence of ferromagnetic and stripe antiferromagnetic spin fluctuations in SrCo${}_2$As${}_2$
• Characteristic Timescales of the Local Moment Dynamics in Hund's-metals
• How to read between the lines of electronic spectra: the diagnostics of fluctuations in strongly correlated electron systems
• Spin Waves in Detwinned BaFe${}_2$As${}_2$
• Local orthorhombic lattice distortions in the paramagnetic tetragonal phase of superconducting NaFe${}_{1-x}$Ni${}_x$As
• On infrared pseudogap in cuprate and pnictide high-temperature superconductors
• Identification of prototypical Brinkman-Rice Mott physics in a class of iron chalcogenides superconductors
• Anisotropy of incommensurate magnetic excitations in slightly overdoped Ba${}_{0.5}$K${}_{0.5}$Fe${}_2$As${}_2$ probed by polarized inelastic neutron scattering experiments
• Spin excitations in the nematic phase and the metallic stripe spin-density wave phase of iron pnictides
• Intra-layer doping effects on the high-energy magnetic correlations in NaFeAs
• Local and collective magnetism of EuFe${}_2$As${}_2$
• Strong ferromagnetic exchange interaction in the parent state of the superconductivity in BaFe${}_2$S${}_3$
• Spin-charge-lattice coupling across the charge density wave transition in a Kagome lattice antiferromagnet
• Spin excitations in optimally P-doped BaFe2(As0.7P0.3)2superconductor
• Electron doping evolution of the magnetic excitations in NaFe${}_{1-x}$Co${}_x$As
• Spin anisotropy due to spin-orbit coupling in optimally hole-doped Ba${}_{0.67}$K${}_{0.33}$Fe${}_2$As${}_2$
• Two spatially separated phases in semiconducting Rb${}_{0.8}$Fe${}_{1.5}$S${}_2$
• Valence and Spin fluctuations in Mn-doped ferroelectric BaTiO3
• Crossover from spin-waves to diffusive spin excitations in underdoped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Presence of magnetic excitations in SmFeAsO
• Orbital-selective spin waves in detwinned NaFeAs
• Correlation Driven Phonon Anomalies in Bulk FeSe
• Reciprocity between local moments and collective magnetic excitations in the phase diagram of BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Reemergeing electronic nematicity in heavily hole-doped Fe-based superconductors
• Suppression of spin-exciton state in hole overdoped iron-based superconductors
• Spin fluctuation anisotropy as a probe of orbital-selective hole-electron quasiparticle excitations in detwinned Ba(Fe1-xCox)2As2
• Spin excitations in hole-overdoped iron-based superconductors
• Electron doping evolution of the neutron spin resonance in NaFe${}_{1-x}$Co${}_x$As
• Spin excitation anisotropy in optimal-isovalent-doped superconductor BaFe2(As0.7P0.3)2
• Neutron Spin Resonance in the Heavily Hole-doped KFe${}_2$As${}_2$ Superconductor
• Epitaxial Integration of a Perpendicularly Magnetized Ferrimagnetic Metal on a Ferroelectric oxide for Electric-Field Control
• Neutron spin resonance as a probe of Fermi surface nesting and superconducting gap symmetry in Ba${}_{0.67}$K${}_{0.33}$(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Magnetic moment evolution and spin freezing in doped BaFe${}_2$As${}_2$
• Interpretable, calibrated neural networks for analysis and understanding of inelastic neutron scattering data
• Low energy magnetic excitations from the Fe${}_{1+y-z}$(Ni/Cu)${}_z$Te${}_{1-x}$Se${}_x$ system
• Preferred magnetic excitations in Sr${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$
• High-energy magnetic excitations from heavy quasiparticles in CeCu${}_2$Si${}_2$
• Strong Spin Resonance Mode associated with suppression of soft magnetic ordering in Hole-doped Ba1-xNaxFe2As2
• Pseudogap and weak multifractality in disordered Mott charge-density-wave insulator
• Local breaking of four-fold rotational symmetry by short-range magnetic order in heavily overdoped Ba(Fe${}_{1-x}$Cu${}_x$)${}_2$As${}_2$
• Anisotropic effect of a magnetic field on the neutron spin resonance in FeSe
• Effect of electron correlations on spin excitation bandwidth in Ba${}_{0.75}$K${}_{0.25}$Fe${}_2$As${}_2$ as seen via time-of-flight inelastic neutron scattering
• Nonlinear uniaxial pressure dependence of $T_c$ in iron-based superconductors
• Electronic specific heat in BaFe${}_{2-x}$Ni${}_x$As${}_2$
• Temperature and polarization dependence of low-energy magnetic fluctuations in nearly-optimal-doped NaFe${}_{0.9785}$Co${}_{0.0215}$As
• Spin dynamics of the spin chain antiferromagnet RbFeS${}_2$
• Neutron Spin Resonance Near a Lifshitz Transition in Overdoped Ba${}_{0.4}$K${}_{0.6}$Fe${}_2$As${}_2$
• Anisotropic inplane spin correlation in the parent and Co-doped BaFe2As2: a neutron scattering study
• Stabilization of $s$-wave superconductivity through arsenic $p$-orbital hybridization in electron-doped BaFe${}_2$As${}_2$
• Doping dependence and electron-boson coupling in the ultrafast relaxation of hot electron populations in Ba(Fe_{1-x}Co_x)_2As_2
• Impurity effects on spin dynamics in magnetic and superconducting iron pnictides and chalcogenides
• Low-energy spin excitations in optimally doped CaFe${}_{0.88}$Co${}_{0.12}$AsF superconductor studied with inelastic neutron scattering
• Emergent ferromagnetic ladder excitations in heavy fermion superconductor CeSb${}_2$
• Enhanced low-energy magnetic excitations evidencing the Cu-induced localization in an Fe-based superconductor Fe${}_{0.98}$Te${}_{0.5}$Se${}_{0.5}$
• Dispersion kinks from electronic correlations in an unconventional iron-based superconductor
• Spin-wave excitations in the SDW state of doped iron pnictides
• Fluctuating magnetism of Co- and Cu-doped NaFeAs
• Spin correlations in the parent phase of Li${}_{1-x}$Fe${}_x$ODFeSe
• Magnetic fluctuation and dominant superconducting pairing symmetry near the tunable Van Hove singularity
• Spin fluctuations in the 112-type iron-based superconductor Ca${}_{0.82}$La${}_{0.18}$Fe${}_{0.96}$Ni${}_{0.04}$As${}_2$
• Spin Fluctuations in the Rare-Earth Doped Bilayer Nickelates
• Three-dimensional spin susceptibility in Ba${}_{0.75}$K${}_{0.25}$Fe${}_2$As${}_2$: Out-of-plane modulation revealed by neutron spectroscopy and theoretical modeling
• Strong local moment antiferromagnetic spin fluctuations in V-doped LiFeAs