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Shown here are measured curves of the low temperature resistivity of Na
with different defect concentrations |
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The resistivity is constant for very small temperatures. |
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In the "bend" it shows T 5 characteristics. |
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For most of the temperature range it is proportional to T. |
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Defects clearly do increase the residual resistance (the upper two curves are
for Na with defects, the lower one for rather perfect Na); the effect can be much large in other metals or
for larger defect densities. |
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© H. Föll (Electronic Materials - Script)
Specific Resistivity as a Function of Temperature 
With frame