Abstract
In this paper we present a combined analysis of the electron transport properties of polycrystallineMgB2 samples, both in the normal and in the superconducting state. This study is aimed atchecking the applicability of multiband models to the evaluation of band conductionparameters as well as at addressing the role of some disorder typologies (Mginclusions, low-level SiC doping) in affecting them. Normal-state resistivities, suitablyrescaled to take into account the grain connectivity, were first analysed in theframework of the model formulated by Mazin et al (2002 Phys. Rev. Lett. 89107002), where we introduced transport spectral functions calculated from thestandard Eliashberg functions. The band scattering rates were obtained: the impurityσ band scattering rate was found to be weakly dependent on magnetic field in allthe analysed samples and to increase with SiC doping. Accordingly, intrabanddiffusivities obtained by analysing the upper critical field in the frameworkof Gurevich’s model (2003 Phys. Rev. B 67 184515) show a decrease of theσ band diffusivity in the SiC-doped sample, whereas no remarkable doping effect was found in theπ band.
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