Nodeless superconductivity in Ca3Ir4Sn13: Evidence from quasiparticle heat transport
S. Y. Zhou, H. Zhang, X. C. Hong, B. Y. Pan, X. Qiu, W. N. Dong, X. L. Li, S. Y. Li
DOI 10.1103/PhysRevB.86.064504 · Physical Review B
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Abstract
We report resistivity ρ and thermal conductivity κ measurements on Ca3Ir4Sn13 single crystals, in which superconductivity with Tc≈7 K was claimed to coexist with ferromagnetic spin fluctuations. Among three crystals, only one crystal shows a small hump in resistivity near 20 K, which was previously attributed to the ferromagnetic spin fluctuations. The other two crystals show the ρ∼T2 Fermi-liquid behavior at low temperature. For both single crystals with and without the resistivity anomaly, the residual linear term κ0/T is negligible in zero magnetic field. In low fields, κ0(H)/T shows a slow field dependence. These results demonstrate that the superconducting gap of Ca3Ir4Sn13 is nodeless and thus rule out a nodal gap caused by ferromagnetic spin fluctuations.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ca3Ir4Sn13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.9 | Pressure not reported | onset |
| Ca3Ir4Sn13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.25 | Pressure not reported | zero_resistance |
| Tl2Ba2CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | unknown |
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