Normal-state electrical resistivity and superconducting magnetic penetration depth in Eu0.5K0.5Fe2As2
Abstract
We report measurements of the temperature dependence of the electrical resistivity, (T), and magnetic penetration depth, λ(T), for polycrystalline samples of Eu0.5K0.5Fe2As2 with Tc=31 K. (T) follows a linear temperature dependence above Tc and bends over to a weaker temperature dependence around 150 K. The magnetic penetration depth, determined by radio frequency technique displays an unusual minimum around 4 K which is associated with short-range ordering of localized Eu3+ moments.
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