Optical evidence for mass enhancement of quasiparticles in pyrochlore Cd${}_2$Re${}_2$O${}_7$

N. L. Wang, J. J. McGuire, T. Timusk +3

We report on the results of optical studies of the newly discovered superconductor Cd${}_2$Re${}_2$O${}_7$ in the normal state. We show that the compound has an exotic metallic state at…