Abstract
The transport and superconducting properties of Ba1 − x K x Fe2As2 single crystals with T c ≈ 31 K were studied. Both in-plane and out-of-plane resistivity was measured by a modified Montgomery method. The in-plane resistivity is almost the same for all studied samples, unlike the out-of-plane resistivity, which differs considerably. We have found that the resistivity anisotropy γ = ρ c /ρ ab is almost independent of temperature and lies in the range 10–30 for the studied samples. This indicates the extrinsic nature of high out-of-plane resistivity, which may be due to the presence of flat defects along Fe-As layers in the samples. This statement is supported by comparatively small effective mass anisotropy, obtained from the upper critical field measurements, and from the observation of the so-called “Friedel transition,” which indicates the existence of some disorder in the samples in the c-direction.
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Zverev, V.N., Korobenko, A.V., Sun, G.L. et al. Transport properties and the anisotropy of Ba1 − x K x Fe2As2 single crystals in normal and superconducting states. Jetp Lett. 90, 130–133 (2009). https://doi.org/10.1134/S0021364009140100
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DOI: https://doi.org/10.1134/S0021364009140100