Emergent Kondo scaling in iron-based superconductors AFe2As2 (A = K, Rb, Cs)

Abstract

Unconventional superconductivity from heavy fermion (HF) is always observed in f-electron systems, in which Kondo physics between localized f-electrons and itinerant electrons plays an essential role. Whether HF superconductivity could be achieved in other systems without f electrons, especially for d-electron systems, is still elusive. Here, we experimentally study the origin of d-electron HF behavior in iron-based superconductors (FeSCs) AFe2As2 (A = K, Rb, Cs). Nuclear magnetic resonance on 75As reveals a universal coherent-incoherent crossover with a characteristic temperature T*. Below T*, a so-called 'Knight shift anomaly' is first observed in FeSCs, which exhibits a scaling behavior similar to f-electron HF materials. Furthermore, the scaling rule also regulates the manifestation of magnetic fluctuation. These results undoubtedly support an emergent Kondo scenario for the d-electron HF behavior, which suggests the AFe2As2 (A = K, Rb, Cs) as the first material realization of d-electron HF superconductors.

15 pages, 4 figures, including supplementary information with 9 figures

References in corpus (15)

• Quantum Criticality in Heavy Fermion Metals
• Strong Correlations and Magnetic Frustration in the High Tc Iron Pnictides
• Theory of Electron Nematic Order in LaOFeAs
• Magnetism and its microscopic origin in iron-based high-temperature superconductors
• Coherence-incoherence crossover in the normal state of iron-oxypnictides and importance of the Hund's rule coupling
• Ising and Spin orders in Iron-based Superconductors
• Observation of universal strong orbital-dependent correlation effects in iron chalcogenides
• Universal Behavior in Heavy Electron Materials
• Doped Mott insulator as the origin of heavy Fermion behavior in LiV2O4
• Similar glassy features in the NMR response of pure and disordered La1.88Sr0.12CuO4
• Nuclear magnetic resonance in the heavy fermion superconductors
• Superconductivity in Ce- and U-based "122" heavy-fermion compounds
• Universal V-shaped temperature-pressure phase diagram in the iron-based superconductors KFe2As2, RbFe2As2, and CsFe2As2
• Specific heat in KFe2As2 in zero and applied magnetic field
• Heat transport in RbFe2As2 single crystal: evidence for nodal superconducting gap

Cited by in corpus (46)

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• Superconductivity in KCa${}_2$Fe${}_4$As${}_4$F${}_2$ with Separate Double Fe${}_2$As${}_2$ Layers
• A New Ferromagnetic Superconductor: CsEuFe${}_4$As${}_4$
• Kondo holes in the 2D itinerant Ising ferromagnet Fe3GeTe2
• Magnetic fluctuations and superconducting properties of CaKFe4As4 studied by 75As NMR
• Evidence of nematic order and nodal superconducting gap along [110] direction in RbFe2As2
• Synthesis, crystal structure and superconductivity in Rb$L{n}_2$Fe${}_4$As${}_4$O${}_2$ ($Ln$ = Sm, Tb, Dy and Ho)
• Superconductivity at 33 - 37 K in $AL{n}_2$Fe${}_4$As${}_4$O${}_2$ ($A$ = K and Cs; $Ln$ = Lanthanides)
• Intrinsic Spin Susceptibility and Pseudogap-like Behavior in Infinite-Layer LaNiO2
• Origin of diverse nematic orders in Fe-based superconductors: 45${}^{\circ }$ rotated nematicity in AFe${}_2$As${}_2$ (A=Cs, Rb)
• Superconductivity at 35 K by self doping in RbGd${}_2$Fe${}_4$As${}_4$O${}_2$
• NMR and NQR studies on transition-metal arsenide superconductors LaRu2As2, KCa2Fe4As4F2, and A2Cr3As3
• Hedgehog Spin-vortex Crystal Antiferromagnetic Quantum Criticality in CaK(Fe1-xNix)4As4 Revealed by NMR
• Thermodynamic signatures of short-range magnetic correlations in UTe${}_2$
• Superconductivity emerging from an electronic phase separation in the charge ordered phase of RbFe${}_2$As${}_2$
• Emerging symmetric strain response and weakening nematic fluctuations in strongly hole-doped iron-based superconductors
• Charge and nematic orders in AFe${}_2$As${}_2$ (A= Rb,Cs) superconductors
• Kondo interaction in FeTe and its potential role in the magnetic order
• Iron-based superconductors: tales from the nuclei
• Dominant in-plane symmetric elastoresistance in CsFe2As2
• Fast recovery of the stripe magnetic order by Mn/Fe substitution in F-doped LaFeAsO superconductors
• Pressure dependence of coherence-incoherence crossover behavior in KFe2As2 observed by resistivity and 75As-NMR/NQR
• Evolution of quasiparticle excitations with critical mass enhancement in superconducting AFe2As2 (A = K, Rb, and Cs)
• Breakdown of single spin-fluid model in heavily hole-doped superconductor CsFe2As2
• Unconventional bulk superconductivity in YFe${}_2$Ge${}_2$ single crystals
• Increasing stripe-type fluctuations in $A$Fe${}_2$As${}_2$ ($A$ = K, Rb, Cs) superconductors probed by ${}^{75}$As NMR spectroscopy
• Helimagnetic Structure and Heavy-Fermion-Like Behavior in the Vicinity of the Quantum Critical Point in Mn${}_3$P
• Kinetic theory of electronic transport in random magnetic fields
• Unraveling the origin of Kondo-like behavior in the 3$d$-electron heavy-fermion compound YFe${}_2$Ge${}_2$
• Approaching itinerant magnetic quantum criticality through a Hund's coupling induced electronic crossover in the YFe${}_2$Ge${}_2$ superconductor
• Constraints on the total coupling strength to bosons in iron based superconductors
• Orbital-selective bad metals due to Hund's rule and orbital anisotropy: a finite-temperature slave-spin treatment of the two-band Hubbard model
• Fermi surface and mass renormalization in the iron-based superconductor YFe${}_2$Ge${}_2$
• Emergent spin-glass state in the doped Hund's metal CsFe2As2
• Mössbauer spectroscopy study of magnetic fluctuations in superconducting RbGd${}_2$Fe${}_4$As${}_4$O${}_2$
• Mass enhancements and band shifts in strongly hole overdoped Fe-based pnictide superconductors: KFe${}_2$As${}_2$ and CsFe${}_2$As${}_2$
• Universal scaling in the Knight shift anomaly of doped periodic Anderson model
• Temperature dependence of NMR Knight shift in pnictides: proximity to a van Hove singularity
• Fingerprints for anisotropic Kondo lattice behavior in the quasiparticle dynamics of the kagome metal Ni${}_3$In
• Diverse Exotic Orders and Fermiology in Fe-based Superconductors: A Unified Mechanism for $B_{1g}/B_{2g}$ Nematicity in FeSe/(Cs,Rb)Fe${}_2$As${}_2$ and Smectic Order in BaFe${}_2$As${}_2$
• Van Hove singularities, chemical pressure and phonons: an angle-resolved photoemission study of KFe${}_2$As${}_2$ and CsFe${}_2$As${}_2$
• Putative quantum critical point in the itinerant magnet ZrFe${}_4$Si${}_2$ with a frustrated quasi-one-dimensional structure
• Dispersion kinks from electronic correlations in an unconventional iron-based superconductor
• Pressure induced superconducting dome in LaNiGa2
• Observation of Two Cascading Screening Processes in an Iron-based Superconductor
• Magnon Damping as a Probe of Kondo Coupling in Magnetically Ordered Systems