Source: /cirosantilli/kondo-effect

= Kondo effect
{c}
{title2=Resistivity increase when temperature is lowered}

If you adda bit of impurities to certain materials, at low temperatures of a few <Kelvin> their <resistivity> actually starts increasing if you go below a certain critical temperature.

\Image[https://upload.wikimedia.org/wikipedia/commons/4/4a/Classickondo.png]
{title=<Kondo effect> graph for <gold> with added impurities}