Unconventional superconductivity in CeIrIn5 and CeCoIn5: Specific heat andthermal conductivity studies

Low temperature specific heat and thermal conductivity measurements on the ambient pressure heavy fermion superconductors CeIrIn5, and CeCoIn5 reveal power law temperature dependences of these quantities below T-c. The low te mperature specific heat in both CeIrIn5 and CeCoIn5 includes T-2 terms, con sistent with the presence of nodes in the superconducting energy gap. The t hermal conductivity data present a T-linear term consistent with the univer sal limit (CeIrIn5). and a low temperature T-3 variation in the clean limit (CeCoIn5), also in accord with prediction for an unconventional supercondu ctor with lines of nodes.