JETP Letters: issues online

VOLUME 94 (2011) | ISSUE 4 | PAGE 357

Normal state resistivity of Ba_1-xK_xFe₂As₂: evidence for multiband strong-coupling behavior

A. A. Golubov^°, O. V. Dolgov $^\triangle$ , A. V. Boris $^\triangle$ , A. Charnukha $^\triangle$ , D. L. Sun $^\triangle$ , C. T. Lin $^\triangle$ , A. F. Shevchun $^\square$ , A. V. Korobenko $^{\square\nabla}$ , M. R. Trunin $^{\square\nabla }$ , V. N. Zverev $^{\square\nabla }$
^°Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, Enschede, The Netherlands
$^\triangle$ Max-Planck-Institut fur Festkorperforschung, D-70569 Stuttgart, Germany
$^\square$ Institute of Solid State Physics, Chernogolovka, Russia
^∇Moscow Institute of Physics and Technology, Dolgoprudny, Russia

Abstract
We present theoretical analysis of the normal state resistivity in multiband superconductors in the framework of Eliashberg theory. The results are compared with measurements of the temperature dependence of normal state resistivity of high-purity Ba_0.68K_0.32Fe₂As₂ single crystals with the highest reported transition temperature T_c = 38.5 K. The experimental data demonstrate strong deviations from the Bloch-Grüneisen behavior, namely the tendency to saturation of the resistivity at high temperatures. The observed behavior of the resistivity is explained within the two band scenario when the first band is strongly coupled and relatively clean, while the second band is weakly coupled and is characterized by much stronger impurity scattering.

Accesses: 831
Download PS file (GZipped, 129.5K) | Download PDF file (200.3K)

BibTex record BibTex record (en)