Non-exponential London penetration depth in Ba${}_{1-}$K${}_x$Fe${}_2$As${}_2$ single crystals

C. Martin, R. T. Gordon, M. A. Tanatar +10

We have studied the in- and out-of-plane magnetic penetration depths in the hole- doped iron based superconductor Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ ($T_c\approx$ 30K). The study…