Physics – Condensed Matter – Superconductivity
Scientific paper
2009-07-15
Pis'ma v ZhETP, 90(2), 140-143 (2009), http://www.jetpletters.ac.ru/ps/1874/article_28559.shtml
Physics
Condensed Matter
Superconductivity
5 pages, 5 figures
Scientific paper
The transport and superconducting properties of Ba_{1-x}K_xFe_2As_2 single crystals with T_c = 31 K were studied. Both in-plane and out-of plane resistivity was measured by modified Montgomery method. The in-plane resistivity for all studied samples, obtained in the course of the same synthesis, is almost the same, unlike to the out-of plane resistivity, which differ considerably. We have found that the resistivity anisotropy \gamma=\rho_c /\rho_{ab} is almost temperature independent and lies in the range 10-30 for different samples. This, probably, indicates on the extrinsic nature of high out-of-plane resistivity, which may appear due to the presence of the 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 on the existence of some disorder in the samples in c-direction.
Boris A. V.
Korobenko A. V.
Lin Tai-Chia
Sun D. L.
Sun G. L.
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