Universal heat conduction in Ce1−xYbxCoIn5: Evidence for robust nodal d-wave superconducting gap
Y. Xu, J. K. Dong, I. K. Lum, J. Zhang, X. C. Hong, L. P. He, K. F. Wang, Y. C. Ma, C. Petrovic, M. B. Maple, L. Shu, S. Y. Li
DOI 10.1103/PhysRevB.93.064502 · Physical Review B
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Abstract
In the heavy-fermion superconductor Ce1−xYbxCoIn5, Yb doping was reported to cause a possible change from nodal d-wave superconductivity to a fully gapped d-wave molecular superfluid of composite pairs near x≈0.07 (nominal value xnom=0.2). Here we present systematic thermal conductivity measurements on Ce1−xYbxCoIn5 (x=0.013, 0.084, and 0.163) single crystals. The observed finite residual linear term κ0/T is insensitive to Yb doping, verifying the universal heat conduction of the nodal d-wave superconducting gap in Ce1−xYbxCoIn5. Similar universal heat conduction is also observed in the CeCo(In1−yCdy)5 system. These results reveal a robust nodal d-wave gap in CeCoIn5 upon Yb or Cd doping.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ce1-xYbxCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.13 | Pressure not reported | midpoint |
| Ce1-xYbxCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.84 | Pressure not reported | midpoint |
| Ce1-xYbxCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.4 | Pressure not reported | midpoint |
| CeCo(In1-yCdy)5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.14 | Pressure not reported | midpoint |
| CeCo(In1-yCdy)5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.05 | Pressure not reported | midpoint |
| CeCo(In1-yCdy)5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.92 | Pressure not reported | midpoint |
| CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.3 | Pressure not reported | unknown |
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