Expt 7) Resistance minimum and Kondo effect
Anshul Kogar
In 1934, de Haas, de Boer and van den Berg showed that the low temperature resistance of “not very pure” gold exhibited a rather peculiar feature. There existed a minimum in the resistance as temperature was reduced. Below are two figures showing the resistance of as a function of temperature in the range from 1-5 K and from 4-12 K: