Multigap nodeless superconductivity in CsCa2Fe4As4F2 probed by heat transport
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 = 29.3 K). A negligible residual linear term 0/T in zero field and the field dependence of 0/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.
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