Universal pair-breaking in transition metal-substituted iron-pnictide superconductors

Abstract

The experimental transport scattering rate was determined for a wide range of optimally doped transition metal-substituted FeAs-based compounds with the ThCr2Si2 (122) crystal structure. The maximum transition temperature Tc for several Ba-, Sr-, and Ca-based 122 systems follows a universal rate of suppression with increasing scattering rate indicative of a common pair-breaking mechanism. Extraction of standard pair-breaking parameters puts a limit of \sim26 K on the maximum Tc for all transition metal-substituted 122 systems, in agreement with experimental observations, and sets a critical scattering rate of 1.5x10^14 s^-1 for the suppression of the superconducting phase. The observed critical scattering rate is much weaker than that expected for a sign-changing order parameter, providing important constraints on the nature of the superconducting gap in the 122 family of iron-based superconductors.

4 pages, 3 figures

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Cited by in corpus (24)

• Change of pairing symmetry in the iron-based superconductor KFe2As2
• Disorder-induced topological change of the superconducting gap structure in iron pnictides
• Using controlled disorder to distinguish $s_{\pm }$ and $s_{++}$ gap structure in Fe-based superconductors
• Strong Correlations, Strong Coupling and s-wave Superconductivity in Hole-doped BaFe2As2 Single Crystals
• Extraordinary quasiparticle scattering and bandwidth-control by dopants in iron-based superconductors
• Ultrafast modulation of the chemical potential in BaFe${}_2$As${}_2$ by coherent phonons
• From d-wave to s-wave pairing in the iron-pnictide superconductor (Ba,K)Fe2As2
• Universal V-shaped temperature-pressure phase diagram in the iron-based superconductors KFe2As2, RbFe2As2, and CsFe2As2
• Nodal gap structure in Fe-based superconductors due to the competition between orbital and spin fluctuations
• Disorder-promoted $C_4$-symmetric magnetic order in iron-based superconductors
• Complex state induced by impurities in multiband superconductors
• Argument on superconductivity pairing mechanism from cobalt impurity doping in FeSe: spin ($s_{\pm }$) or orbital ($s_{++}$) fluctuation
• Effect of realistic finite-size impurities on Tc in Fe-based superconductors based on the five-orbital tight-binding model
• Correlation-induced self-doping in intercalated iron-pnictide superconductor Ba2Ti2Fe2As4O
• Possible unconventional superconductivity in substituted BaFe${}_2$As${}_2$ revealed by magnetic pair-breaking studies
• Doping effect of Cu and Ni impurities on the Fe-based superconductor Ba0.6K0.4Fe2As2
• Effect of weak disorder on the phase competition in iron pnictides
• The effect of interorbital scattering on superconductivity in doped Dirac materials
• Robustness of quantum critical pairing against disorder
• Charge doping versus impurity scattering in chemically substituted iron-pnictides
• Pairing mechanism for nodal $s$-wave superconductivity in BaFe${}_2$(As,P)${}_2$: Analysis beyond Migdal-Eliashberg formalism
• Miscibility gap and possible intrinsic Griffiths phase in Sr(Fe1-xMnx)2As2 crystals grown by transitional metal arsenide flux
• Impurity effects on spin dynamics in magnetic and superconducting iron pnictides and chalcogenides
• Isotropic multi-gap superconductivity in BaFe1.9Pt0.1As2 from thermal transport and spectroscopic measurements