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| VOLUME 90 (2009) | ISSUE 2 | PAGE 140 |
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Transport properties and the anisotropy of Ba1-xKxFe2As2 single crystals in normal and superconducting states
V. N. Zverev
 , A. V. Korobenko , G. L. Sun , D. L. Sun, C. T. Lin, A. V. BorisInstitute of Solid State Physics RAS, 142432 Chernogolovka, Moscow region, Russia+Moscow Institute of Physics and Technology, Dolgoprudny, Moscow region, Russia Max- Planck- Institut für Festkörperforschung, 70569 Stuttgart, Germany
PACS: 74.25.Fy
Abstract
The transport and superconducting properties of Ba1-xKxFe2As2 single crystals with  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=ρc/ρab 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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