Evolution of London penetration depth with scattering in single crystals of K${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$

Abstract

London penetration depth, $\lambda (T)$, was measured in single crystals of K${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$, $x$=0 and 0.07, down to temperatures of 50~mK, $\sim T_c/50$. Isovalent substitution of Na for K significantly increases impurity scattering, with $\rho (T_c)$ rising from 0.2 to 2.2 $\mu \Omega$cm, and leads to a suppression of $T_c$ from 3.5~K to 2.8~K. At the same time, a close to $T$-linear $\Delta \lambda (T)$ in pure samples changes to almost $T^2$ in the substituted samples. The behavior never becomes exponential as expected for the accidental nodes, as opposed to $T^2$ dependence in superconductors with symmetry imposed line nodes. The superfluid density in the full temperature range follows a simple clean and dirty $d$-wave dependence, for pure and substituted samples, respectively. This result contradicts suggestions of multi-band scenarios with strongly different gap structure on four sheets of the Fermi surface.

References in corpus (50)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• Resonant Spin Excitation in the High Temperature Superconductor Ba0.6K0.4Fe2As2
• Superconductivity and Crystal Structures of (Ba1-xKx)Fe2As2 (x = 0 - 1)
• Phenomenological two-gap model for the specific heat of MgB_2
• A Sharp Peak of the Zero-Temperature Penetration Depth at Optimal Composition in BaFe2(As1-xPx)2
• The BCS-like gap in superconductor SmFeAsO_0.85F_0.15
• Universal scaling relation in high-temperature superconductors
• Fermi Surface, Surface States, and Surface Reconstruction in Sr2RuO4
• Quantum criticality and nodal superconductivity in the FeAs-based superconductor KFe2As2
• Universal Heat Conduction in YBa_2Cu_3O_6.9
• Meissner - London state in superconductors of rectangular cross-section in perpendicular magnetic field
• London Penetration Depth in Iron - based Superconductors
• Evidence for superconducting gap nodes in the zone-centered hole bands of KFe2As2 from magnetic penetration-depth measurements
• Probing superconducting energy gap from infrared spectroscopy on a Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ single crystal with T${}_c$=37 K
• Anisotropy of the Optimally-Doped Iron Pnictide Superconductor Ba(Fe0.926Co0.074)2As2
• Evidence of Strong Correlations and Coherence-Incoherence Crossover in the Iron Pnictide Superconductor KFe2As2
• Universal heat conduction in the iron-arsenide superconductor KFe2As2 : Evidence of a d-wave state
• Nodes in the gap structure of the iron-arsenide superconductor Ba(Fe_{1-x}Co_x)_2As_2 from c-axis heat transport measurements
• Exotic d-wave superconductivity in strongly hole doped K(x)Ba(1-x)Fe2As2
• Doping dependence of heat transport in the iron-arsenide superconductor Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$: from isotropic to strongly $k$-dependent gap structure
• Change of pairing symmetry in the iron-based superconductor KFe2As2
• Lifting of nodes by disorder in extended-$s$ state superconductors: application to ferropnictides
• Possible Multiple Gap Superconductivity with Line Nodes in Heavily Hole-Doped Superconductor KFe2As2 Studied by 75As-NQR and Specific Heat
• Nematicity as a probe of superconducting pairing in iron-based superconductors
• Single Crystal Growth and Characterization of the Iron-Based Superconductor KFe2As2 Synthesized by KAs Flux Method
• Superfluid density and penetration depth in Fe-pnictides
• The London penetration depth in single crystals of Ba(Fe_{1-x}Co_x)_2As_2 at various doping levels
• Fermi surface and mass enhancement in KFe${}_2$As${}_2$ from de Haas-van Alphen effect measurements
• Specific heat and upper critical field in KFe2As2 single crystals
• Doping evolution of the absolute value of the London penetration depth and superfluid density in single crystals of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• From d-wave to s-wave pairing in the iron-pnictide superconductor (Ba,K)Fe2As2
• A comprehensive scenario of the single crystal growth and doping dependence of resistivity and anisotropic upper critical fields in (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$ ($0.22\le x\le 1$)
• The pairing state in KFe2As2 studied by measurements of the magnetic vortex lattice
• Homes scaling and BCS
• Evidence of d-wave Superconductivity in K_(1-x)Na_xFe_2As_2 (x = 0, 0.1) Single Crystals from Low-Temperature Specific Heat Measurements
• Specific heat in KFe2As2 in zero and applied magnetic field
• Superconducting specific heat jump $\Delta C_{\mathrm{el}}\propto T_c^{\beta }(\beta \approx 2)$ for K${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$
• Upper critical field of isoelectron substituted SrFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Upper critical field of high quality single crystals of KFe${}_2$As${}_2$
• Specific Heat Discontinuity DeltaC vs Tc in Annealed Ba(Fe1-xCox)2As2
• Anomalous impurity effects in the iron-based superconductor KFe${}_2$As${}_2$
• Thermodynamic Study of Nodal Structure and Multiband Superconductivity of KFe2As2
• Statistics of subgap states in $s_{\pm }$ superconductors
• How robust the global measurements of London penetration depth are: the case of Fe(Te${}_{1-x}$,Se${}_x$)
• Doping - dependent anisotropic superconducting gap in Na${}_{1-\delta }$(Fe${}_{1-x}$Co${}_x$)As
• Evidence for line nodes in the energy gap of the overdoped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ from low-temperature specific heat measurements
• Specific Heat To Hc2: Evidence for Nodes or Deep Minima in the Superconducting Gap of Under- and Overdoped Ba(Fe1-xCox)2As2
• Disordered magnetism in superconducting KFe2As2 single crystals
• Rutgers relation for the analysis of superfluid density in superconductors

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• Neutron Spin Resonance in the Heavily Hole-doped KFe${}_2$As${}_2$ Superconductor
• Superconducting properties of K${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$ under pressure
• Details of the disorder-induced transition between $s_{\pm }$ and $s_{++}$ states in two-band model for Fe-based superconductors
• Dielectric Resonator Method For Determining Gap Symmetry Of Superconductors Through Anisotropic Nonlinear Meissner Effect
• Constraints on the total coupling strength to bosons in iron based superconductors
• Orbital and Pauli limiting effects in heavily doped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• London penetration depth at zero temperature and near superconducting transition
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