Superfluid density and penetration depth in Fe-pnictides

Details Superfluid density and penetration depth in Fe-pnictides Superfluid density and penetration depth in Fe-pnictides

2009-01-06

arxiv.org/abs/0901.0719v2

Phys. Rev. B 79, 140507(R) (2009).

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures; replaced with updated version

Scientific paper

10.1103/PhysRevB.79.140507

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 $n\approx 1.6\div2$ 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.

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