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

Abstract

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.

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

References in corpus (2)

• Heavy-fermion superconductivity in CeCoIn5 at 2.3K
• A New Heavy-Fermion Superconductor CeIrIn5: Relative of the Cuprates?

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