Superfluid density and penetration depth in Fe-pnictides

Abstract

We consider the superfluid density ${\rho }_s(T)$ in a two-band superconductor with extended s-wave symmetry ($s^{+}$) in the presence of non-magnetic impurities and apply the results to Fe-pnictides. We show that the behavior of the superfluid density is essentially the same as in an ordinary s-wave superconductor with magnetic impurities. We show that, for moderate to strong inter-band impurity scattering, ${\rho }_s(T)$ behaves as a power-law $T^n$ with $n\approx 1.6÷2$ over a wide range of $T$. We argue that the power-law behavior is consistent with recent experiments on the penetration depth $\lambda (T)$ in BaFe${}_2$As${}_2$, but disagree quantitatively with the data on LaFePO.

4 pages, 2 figures; replaced with updated version

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Cited by in corpus (4)

• Microwave Surface-Impedance Measurements of the Magnetic Penetration Depth in Single Crystal Ba1-xKxFe2As2 Superconductors: Evidence for a Disorder-Dependent Superfluid Density
• Momentum dependence and nodes of the superconducting gap in iron-pnictides
• Origin of Gap Anisotropy in Spin Fluctuation Models of the Fe-pnictides
• Non-exponential London penetration depth in Ba${}_{1-}$K${}_x$Fe${}_2$As${}_2$ single crystals