Abstract
A series of samples of Mg1-xPbxB2 were synthesized by the conventional solid state reaction method. Its temperature dependence of resistivity was studied from the zero resistivity temperature T-c up to 300 K. In order to more understand the main reason of the decreases of T-c, we analyse the resistivity versus temperature data in the normal state using Bloch-Gruneisen formula. The Debye temperature, theta(D), has been extracted from the fits. theta(D) is seen to decrease with the lead substitution from 1280 K to 835 K. Using theta(D) and T-c, the electron-phonon interaction parameter lambda, has been given by McMillan equation. The values of lambda increase from 0.70 to 0.84 respectively for x = 0 % and x = 1 % sample. The decrease in T-c is argued mainly by the decrease in the density of states at the Fermi level N(E-F) with Pb concentration than the decrease in theta(D). (c) 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.