Comment on "Isoelectronic Ru substitution at Fe-site in Sm(Fe₁₋ₓRuₓ)AsO₀.₈₅F₀.₁₅ compound and its effects on structural, superconducting and normal state properties" (arXiv:1004.1978)

الأصل · EN

Based on the five-orbital model, we derive the reduced impurity scattering rate g=zγ/2πTc₀ in Sm(Fe₁₋ₓRuₓ)AsO₀.₈₅F₀.₁₅ from the residual resistivity. At x=0, the transition temperature is Tc₀=50 K. For 0.05<x<0.36 (0.84>Tc/Tc₀>0.3) the obtained value of g ranges from 1.5 to 2.9, which suggests that the s±-wave state cannot survive. We point out that the magnetoresistance frequently gives an underestimated value of g in correlated electron systems.