Abstract
The resistance of a lead sample was measured with very high accuracy from 295K to the melting temperature 600.7K. Up to about 540K the resistance is determined by electron-phonon and electron-vacancy scattering with a vacancy formation enthalpy of 0.38 eV. Above 540K there is an additional term in the resistance, well described by a thermally created defect with a formation enthalpy of 1.42 eV. While the vacancy formation entropy is approximately 1.6kB the formation entropy of the new defect is approximately 16kB. This leads the authors to believe that the new defect has a liquid-like structure and consists approximately of a central atom or vacancy plus its nearest neighbours.
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