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Normal-state electrical resistivity and superconducting magnetic penetration depth in Eu0.5K0.5Fe2As2

We report measurements of the temperature dependence of the electrical resistivity, ρ(T), and magnetic penetration depth, λ(T), for polycrystalline samples of Eu_0.5K_0.5Fe_2As_2 with Tc=31 K. $ρ(T)$ follows a linear temperature dependence above T_c 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.

preprint2009arXivOpen access
V. A. GasparovH. S. JeevanP. Gegenwart
cond-mat.supr-concond-mat.str-el
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V. A. GasparovH. S. JeevanP. Gegenwart

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