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We present a microscopic model for systems showing resistivity saturation. Anessentially exact quantum Monte-Carlo calculation demonstrates that the modeldescribes saturation. We give a simple explanation for saturation, using chargeconservation and considering the limit where thermally excited phonons havedestroyed the periodicity. Crucial model features are phonons coupling to thehopping matrix elements and a unit cell with several atoms. We demonstrate thedifference to a model of alkali-doped C60 with coupling to the level positions,for which there is no saturation.

Saturation of Electrical Resistivity in Metals at Large Temperatures