Anisotropy of the superconducting gap in CeCo2s
Y. Aoki, T. Nishigaki, H. Sugawara, H. Sato
DOI 10.1103/PhysRevB.55.2768 · Physical Review B
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Abstract
We find extraordinary superconducting characteristics in the low-temperature specific heat of high quality CeCo2 single crystals, suggesting that the superconducting gap is highly anisotropic. The electronic specific-heat jump at the superconducting transition temperature (Tc =1.5 K) is ΔCe /γTc =0.85, which is reduced compared to the BCS value of 1.43. At low temperatures (0.13Tc ≪1), Ce varies approximately as T2 , indicating a possibility of lines of nodes in the gap. A possible correlation of the gap anisotropy with the ferromagnetic spin fluctuation is discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeCo2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.43 | Pressure not reported | midpoint |
| CeCo2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.48 | Pressure not reported | midpoint |
| CeCo2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.5 | Pressure not reported | unknown |
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