Griineisen Model of Resistivity

As stated previously, the Mattheissen formulation for resistivity holds only for temperatures greater than about 20% of the Debye temperature because all of the vibrational modes that can scatter electrons are not active at low temperatures. Griineisen used the Debye model to formulate an exact theory of the temperature dependence of resistivity for metals that extends the temperature dependence of resistivity to low temperatures. 

Universal reduced temperature plot for metals. It may be seen that the resistivity becomes linear with temperature for T 0.20 0d- 

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