From Kondo impurities to heavy-fermion superconductivity and quantum critical points

Early results on the dilute Kondo alloy (La, Ce)Al2 as well as on the Kondo-lattice system CeAl2 are discussed, before previous and more recent investigations on CeCu2Si2, the first heavy-fermion superconductor, are addressed. After a brief review of the highly unusual properties of the non-Fermi-liquid metal YbRh2Si2, a short remark concerning the interplay between quantum criticality and heavy-fermion superconductivity concludes the paper.