by Ciro Santilli (@cirosantilli, 32)
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.
Figure 1.
Kondo effect graph for gold with added impurities
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  1. Dependence of electrical resistivity on tempreature
  2. Electrical resistivity and conductivity
  3. Condensed matter physics
  4. Physics
  5. Natural science
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