London penetration depth and strong pair-breaking in iron-based superconductors

Details London penetration depth and strong pair-breaking in iron-based superconductors London penetration depth and strong pair-breaking in iron-based superconductors

2009-12-29

arxiv.org/abs/0912.5346v1

Phys. Rev. B 81, 180501R (2010)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.81.180501

The low temperature variation of the London penetration depth for a number of iron-pnictide and iron-chalcogenide superconductors is nearly quadratic, $\Delta \lambda(T) = \beta T^n$ with $n\approx 2$. The coefficient in this dependence shows a robust scaling, $\beta \propto 1/T_c^3$ across different families of these materials. We associate the scaling with a strong pair-breaking. The same mechanism have recently been suggested to explain the scalings of the specific heat jump, $\Delta C \propto T_c^3$, and of the slopes of the upper critical field, $dH_{c2}/dT\propto T_c$ in these materials. This suggests that thermodynamic and electromagnetic properties of the iron-based superconductors can be described within a strong pair-breaking scenario.

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