SUPERCONDUCTIVITY AND MAGNET1 C ORDER "

Rdsum6.- Les composds supraconducteurs terres rares (TR) ternaires et pseudoternaires sont des candidats excellents pour une dtude de la coexistence de la supraconductivitd et l'ordre 2 longue portde des moments magndtiques des terres rares. Nous prdsentons un bref rdsumd des investigations rdcentes sur l'interaction entre la supraconductivitd et l'ordre magn6tique P longue portse dans les composds ternaires et pseudoternaires des TR molybdPne cha1cogCni.de et rhodium boride. Abstract.- Superconducting ternary and pseudoternary rare earth (RE) compounds are excellent candi-dates in which to study the coexistence of superconductivi'ty and long-range ordering of W3 magnetic moments. Recent investigations of the interaction between superconductivity and long-range magnetic order in ternary and pseudoternary RE molybdenum chalcogenide and RE rhodium boride compounds are briefly reviewed. 1. INTRODUCTION.- Superconductinp ternary compounds of rare earth (RE) ions with partially-filled 4f electron shells provide a unique opportunity to study the coexistence of superconductivity and ma-gnetic order. Since the RE ions in these ternar