Unconventional superconductivity in CeIrIn$_5$ and CeCoIn$_5$: Specific heat and thermal conductivity studies

Details Unconventional superconductivity in CeIrIn$_5$ and CeCoIn$_5$: Specific heat and thermal conductivity studies Unconventional superconductivity in CeIrIn$_5$ and CeCoIn$_5$: Specific heat and thermal conductivity studies

2000-11-21

arxiv.org/abs/cond-mat/0011365v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, new figures 1 and 2. Data retaken after thermometer's recalibration

Scientific paper

10.1103/PhysRevLett.86.5152

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 temperature specific heat in both CeIrIn5 and CeCoIn5 includes T$^2$ terms, consistent with the presence of nodes in the superconducting energy gap. The thermal conductivity data present a T-linear term consistent with the universal limit (CeIrIn5), and a low temperature T$^3$ variation in the clean limit (CeCoIn5), also in accord with prediction for an unconventional superconductor with lines of nodes.

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