We calculate from first principles the high-frequency high-temperature conductivity of metals and find that to dominant order the temperature-dependent collision frequency is given by ν(<i>T</i>) = ν<sub>1</sub>(<i>T</i>/<i>T<sub>m</sub></i>) + ν<sub>2</sub>(<i>T</i>/<i>Tm</i>)<sup>2</sup>, where <i>T<sub>m</sub></i> represents the melting temperature and ν<sub>1</sub> and ν<sub>2</sub> are independent of <i>T</i>. The origin of the quadratic-temperature term arises from the contribution of the anharmonic ion potential near melting to the phonon spectra.
© 1981 Optical Society of America
N. Tzoar, "High-frequency high-temperature conductivity of metals," J. Opt. Soc. Am. 71, 1094-1098 (1981)