Multigap nodeless superconductivity in CsCa2Fe4As4F2 probed by heat transport
Y. Y. Huang, Z. C. Wang, Y. J. Yu, J. M. Ni, Q. Li, E. J. Cheng, G. H. Cao, S. Y. Li
DOI 10.1103/PhysRevB.99.020502 · Physical Review B
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Abstract
Recently, a new family of iron-based superconductors called 12442 was discovered and the muon spin relaxation (μSR) measurements on KCa2Fe4As4F2 and CsCa2Fe4As4F2 polycrystals, two members of the family, indicated that both have a nodal superconducting gap structure with s+d pairing symmetry. Here we report the ultralow-temperature thermal conductivity measurements on CsCa2Fe4As4F2 single crystals (Tc=29.3K). A negligible residual linear term κ0/T in zero field and the field dependence of κ0/T suggest multiple nodeless superconducting gaps in CsCa2Fe4As4F2. This gap structure is similar to CaKFe4As4 and moderately doped Ba1−xKxFe2As2 but contrasts to the nodal gap structure indicated by the μSR measurements on CsCa2Fe4As4F2 polycrystals.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CsCa2Fe4As4F2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 29.3 | Pressure not reported | zero_resistance |
| CsCa2Fe4As4F2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 29.2 | Pressure not reported | onset |
| CsCa2Fe4As4F2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30.2 | Pressure not reported | onset |
| CsCa2Fe4As4F2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28.2 | Pressure not reported | unknown |
| KCa2Fe4As4F2 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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