Universal heat conduction and nodal gap structure of the heavy-fermion superconductor CeIrIn5
H. Shakeripour, M. A. Tanatar, C. Petrovic, Louis Taillefer
DOI 10.1103/PhysRevB.82.184531 · Physical Review B
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Abstract
The effect of impurity scattering on the thermal conductivity κ of the heavy-fermion superconductor CeIrIn5 was studied for a current parallel (J∥c) and perpendicular (J∥a) to the tetragonal c axis. For J∥a, adding La impurities does not change the residual linear term κ0a/T, showing that heat conduction in the basal plane is universal, compelling evidence that the superconducting gap vanishes along a symmetry-imposed line. By contrast, for J∥c, La impurities greatly enhance the residual linear term κ0c/T. This is strong evidence that the line of nodes lies within the basal plane, a gap structure which is inconsistent with the d-wave symmetry proposed for the isostructural superconductor CeCoIn5. Different symmetries in the two materials could explain why the phase diagram of this heavy-fermion family consists of two separate superconducting domes. We also compare our data on CeIrIn5 to corresponding data on the heavy-fermion superconductor UPt3, where no universal conduction is observed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeIrIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.38 | Pressure not reported | unknown |
| Ce0.999La0.001IrIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.34 | Pressure not reported | unknown |
| CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.44 | Pressure not reported | unknown |
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