Abstract
The temperature dependence of resistivity in the normal state of polycrystalline MgB 2 samples including various amounts of Ag powder has been studied systematically. The samples show different temperature dependences of normal state resistivity and residual resistance ratios (RRRs) although their superconducting temperatures are nearly the same. Ag powder admixture was found to increase the RRR, suggesting a decrease of the defect scattering density. We have shown that the normal state of samples exhibits a power law dependence of the temperature dependent resistivity ( T n with n>1) and changes to become linear as we increase the silver content. The normal state behaviour of polycrystalline MgB 2 samples is thus thought to be drastically affected by carrier scatterings at grain boundaries defects, which most probably arise from Mg deficiency.
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