Transition from heavy fermion metal to 16 K superconductor in single crystal YbxLu(1-x)Ni2B2C: transport studies

YbNi2B2C has been found to be a heavy fermion metal with neither supercondu ctivity nor magnetic order in contrast to the other members of the borocarb ide family. LuNi2B2C is a superconductor with T-c similar to 16.3K and no m agnetic order. Transport studies on single crystal YbxLu(1-x)Ni2B2C show a systematic change from a heavy fermion system to a moderately high-temperat ure superconductor. A "giant" thermopower is observed for small x to x=1, i .e., in the transition region from a Kondo alloy to a heavy fermion metal. Measurements of H-c2(T,x) are also reported for x<0.15.