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VOLUME 89 (2009) | ISSUE 6 | PAGE 343
Normal-state electrical resistivity and superconducting magnetic penetration depth in Eu0.5K0.5Fe2As2 polycrystals
PACS: 74.25.-q, 74.70.Dd, 75.30.Hx
Abstract
We report measurements of the temperature dependence of the electrical resistivity, ρ(T), and magnetic penetration depth, λ(T), for polycrystalline samples of Eu0.5K0.5Fe2As2 with Tc=31 K. ρ(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.