Hybrid Gap Structure of the Heavy-Fermion Superconductor CeIrIn5
H. Shakeripour, M. A. Tanatar, S. Y. Li, C. Petrovic, Louis Taillefer
DOI 10.1103/PhysRevLett.99.187004 · Physical Review Letters
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Abstract
The thermal conductivity κ of the heavy-fermion superconductor CeIrIn5 was measured as a function of temperature down to Tc/8, for current directions parallel (J∥c) and perpendicular (J∥a) to the tetragonal c axis. For J∥a, a sizable residual linear term κ0/T is observed, as previously, which confirms the presence of line nodes in the superconducting gap. For J∥c, on the other hand, κ/T→0 as T→0. The resulting precipitous decline in the anisotropy ratio κc/κa at low temperature rules out a gap structure with line nodes running along the c axis, such as the d-wave state favored for CeCoIn5, and instead points to a hybrid gap of Eg symmetry.
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. | 0.4 | Pressure not reported | unknown |
| 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 |
| CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| CeIn3 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. | — | Pressure not reported | unknown |
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