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 Ba0.68K0.32Fe2As2 single
crystals with the highest reported transition temperature Tc=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.
Citation:
A. A. Golubov, O. V. Dolgov, A. V. Boris, A. Charnukha, D. L. Sun, C. T. Lin, A. F. Shevchun, A. V. Korobenko, M. R. Trunin, V. N. Zverev, “Normal state resistivity of
Ba1−xKxFe2As2: evidence for multiband strong-coupling behavior”, Pis'ma v Zh. Èksper. Teoret. Fiz., 94:4 (2011), 357–361; JETP Letters, 94:4 (2011), 333–337
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