In this work, we report resistivity measurements on MgB 2 polycrystalline samples with increasing degree of doping ͑disorder͒ up to temperatures higher than 900 K. In all cases the normal state curves are linear with increasing temperatures, with no sign of flattening or downward bending ͑saturation͒ at high temperature. This behavior, in sharp contrast to what is observed in superconducting compounds such as A15 and Chevrel phases, can be explained considering the dominant contribution to the electric conduction, together with the smaller electron-phonon coupling of carriers in MgB 2 , as compared to characteristic coupling strength of those compounds. This indicates that in MgB 2 the disorder introduced in the lattice by thermal oscillations even at 900 K can still be considered as a perturbation within the Boltzmann description of transport.
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