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We report measurements of the temperature dependence of the radio-frequencymagnetic penetration depth in Ba_0.68K_0.32Fe_2As_2 andBa(Fe_0.93Co_0.07)_2As_2 single crystals in pulsed magnetic fields up to 60 T.From our data, we construct an H-T phase diagram for the inter-plane (H || c)and in-plane (H || ab) directions for both compounds. For both fieldorientations in Ba_0.68K_0.32Fe_2As_2, we find a concave curvature of theHc2(T) lines with decreasing anisotropy and saturation towards lowertemperature. Taking into account Pauli spin paramagnetism we can describeHc2(T) and its anisotropy. In contrast, we find that Pauli paramagnetic pairbreaking is not essential for Ba(Fe_0.93Co_0.07)_2As_2. For this electron-dopedcompound, the data support a Hc2(T) dependence that can be described by theWerthamer Helfand Hohenberg model for H || ab and a two-gap behavior for H ||c.

Upper critical magnetic field in Ba_0.68K_0.32Fe_2As_2 and Ba(Fe_0.93Co_0.07)_2As_2