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The transport and superconducting properties of Ba_{1-x}K_xFe_2As_2 singlecrystals with T_c = 31 K were studied. Both in-plane and out-of planeresistivity was measured by modified Montgomery method. The in-planeresistivity for all studied samples, obtained in the course of the samesynthesis, is almost the same, unlike to the out-of plane resistivity, whichdiffer considerably. We have found that the resistivity anisotropy\gamma=\rho_c /\rho_{ab} is almost temperature independent and lies in therange 10-30 for different samples. This, probably, indicates on the extrinsicnature of high out-of-plane resistivity, which may appear due to the presenceof the flat defects along Fe-As layers in the samples. This statement issupported by comparatively small effective mass anisotropy, obtained from theupper critical field measurements, and from the observation of the so-called"Friedel transition", which indicates on the existence of some disorder in thesamples in c-direction.

Transport properties and the anisotropy of Ba_{1-x}K_xFe_2As_2 single crystals in normal and superconducting states