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Typeset with jpsj2.cls <ver.1.2> Letter Resistivity and upper critical field in KFe2As2 single crystals

By Taichi Terashima, Motoi Kimata, Hidetaka Satsukawa, Atsushi Harada, Shinya Uji, Hisatomo Harima, Gen-fu Chen, Jian-lin Luo and Nan-lin Wang

Abstract

We report resistivity measurements performed on KFe2As2 single crystals down to T = 0.3 K and in magnetic fields up to 17.5 T. The in-plane resistivity vs. T curve has a convex shape down to ∼50 K and shows a T 2 dependence below ∼45 K. The ratio of the c-axis to in-plane resistivities is ∼10 at room temperature and ∼40 at 4.2 K. The superconducting upper critical field Bc2(T) has been determined from the resistivity data: Bab c2(0) = 4.47 T increases with T and is 6.8 and Bc c2 (0) = 1.25 T. The anisotropy parameter Γ = Bab c2 /Bc c2 at T = Tc. The strong curvature of the Bab c2 (T) curve indicates the existence of strong spin paramagnetic effects

Topics: iron pnictide superconductor, resistivity, upper critical field
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