Abstract
We reexamined the experimental evidence for the possible existence of superconducting (SC) gap nodes in the three most suspected Fe-pnictide SC compounds: LaFePO, BaFe2(As0.67P0.33)2, and KFe2As2. We showed that while the T-linear temperature dependence of the penetration depth λ(T) of these three compounds indicates extremely clean nodal gap superconductors, the thermal conductivity data limT,H→0 κS(H,T)/T unambiguously showed that LaFePO and BaFe2(As0.67P0.33)2 are extremely dirty, while KFe2As2 can possibly be clean. These apparently conflicting experimental data cast a serious doubt on the nodal gap possibility for LaFePO and BaFe2(As0.67P0.33)2.
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