Nodal gap in iron-based superconductor CsFe2As2 probed by quasiparticle heat transport
X. C. Hong, X. L. Li, B. Y. Pan, L. P. He, A. F. Wang, X. G. Luo, X. H. Chen, S. Y. Li
DOI 10.1103/PhysRevB.87.144502 · Physical Review B
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Abstract
The thermal conductivity of iron-based superconductor CsFe2As2 single crystal (Tc=1.81 K) was measured down to 50 mK. A significant residual linear term κ0/T=1.27 mW K−2 cm−1 is observed in zero magnetic field, which is about 1/10 of the normal-state value in upper critical field Hc2. In low magnetic field, κ0/T increases rapidly with field. The normalized κ0/T(H) curve for our CsFe2As2 (with residual resistivity ρ0=1.80 μΩ cm) lies between the dirty KFe2As2 (with ρ0=3.32 μΩ cm) and the clean KFe2As2 (with ρ0=0.21 μΩ cm), which is consistent with its impurity level. These results strongly suggest a nodal superconducting gap in CsFe2As2, similar to its sister compound KFe2As2.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CsFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.81 | Pressure not reported | zero_resistance |
| CsFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.2 | Pressure not reported | onset |
| RbFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.6 | Pressure not reported | unknown |
| KFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.8 | Pressure not reported | unknown |
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