Superconductivity and Long-Range Magnetic Order in Ternary Rare-Earth Transition-Metal Borides

摘要

Many high superconducting transition temperature (T/sub c/) superconductors have been discovered in rare earth transition metal borides, such as some compounds in the primitive tetragonal RERh sub 4 B sub 4 , body-centered tetragonal RERu sub 4 B sub 4 or orthorhombic RERuB sub 2 systems. The high transition temperatures present in many of those compounds as well as the regular sublattice of rare earth atoms provide an opportunity for studying the interaction of superconductivity and long range magnetic order. The close correlation between superconductivity, magnetic order and structural features is demonstrated with the study of the pseudoternary systems Er(Rh/sub 1-x/Ru/sub x/) sub 4 B sub 4 , Y(Rh/sub 1-x/Ru/sub x/) sub 4 B sub 4 and (Lu/sub 1-x/Er/sub x/)RuB sub 2 . The systematic investigation of the role of each atom in the particular ternary boride structure is addressed by low temperature measurements of electronic, transport and magnetic properties as well as by metallurgical methods. Results are reported. (ERA citation 08:012714)