Magnetic penetration depth in disordered iron-based superconductors

Abstract

We study the effect of disorder on the London penetration depth in iron-based superconductors. The theory is based on a two-band model with quasi-two-dimensional Fermi surfaces, which allows for the coexistence region in the phase diagram between magnetic and superconducting states in the presence of intraband and interband scattering. Within the quasiclassical approximation we derive and solve Eilenberger's equations, which include a weak external magnetic field, and provide analytical expressions for the penetration depth in the various limiting cases. A complete numerical analysis of the doping and temperature dependence of the London penetration depth reveals the crucial effect of disorder scattering, which is especially pronounced in the coexistence phase. The experimental implications of our results are discussed.

10 pages, 6 figures

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• Quasiclassical theory for antiferromagnetic metals
• Anomalous sharp peak in the London penetration depth induced by the nodeless-to-nodal superconducting transition in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
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• Quantum criticality in Ce${}_{1-x}$Sm${}_x$CoIn${}_5$
• Quasiclassical circuit-theory of contiguous disordered multiband superconductors
• Thermodynamic properties of nodal superconductors close to a magnetic quantum critical point
• Josephsonic diagnostic of competing orders in quantum critical multiband superconductors
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• Short-range antiferromagnetic correlations in the superconducting state of filled skutterudite alloys Pr${}_{1-x}$Eu${}_x$Pt${}_4$Ge${}_{12}$
• Quasiclassical theory of $C_4$-symmetric magnetic order in disordered multiband metals