Abstract
Quaternary borocarbide superconductors RENi 2B 2C (RE = Y, Dy, Ho, Er, Tm and Lu) have several featuers which make them ideal candidates to study one of the most exciting and intriguing phenomena of condensed matter, viz., the interplay of superconductivity and long range magnetic order. Not only their superconducting transition temperatures are the highest among the intermetallic superconductors, their magnetic ordering temperatures are also the highest among all the known magnetic superconductors. DyNi 2B 2C presents a very interesting situtation; superconductivity sets in an already magnetically ordered lattice. Other examples of this interplay in the borocarbide family will be presented. Absence of superconductivity in YbNi 2B 2C is rather anomalous, it points to the 4f-conduction electron hybridization.
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