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Cho et al. [Phys. Rev. B, 84, 174502 (2011)] have reported on the temperaturedependence of the London penetration depth deduced from Tunnel Diode Oscillator(TDO) measurements in optimally doped Fe(Se,Te) single crystals. According totheir analysis, these measurements chould suggest a nodeless two-gap pairingsymmetry with strong pair breaking effects. However, to reach this conclusion,the authors fit the temperature dependence of the superfluid density with a twoband {\it clean} limit model which is incompatible with the presence of strongpair breaking effects, deduced from the $T^n$ temperature dependence of theLondon penetration depth below $T_c/3$. Moreover they claim that their resultsare also ruling out the suggestion that surface conditions can significantlyaffect the TDO data but this conclusion is based on one very specific damagingprocess, and is completely ignoring the large dispersion in the previouslypublished TDO data.

Comment on "Precision global measurements of London penetration depth in FeTe$_{0.58}$Se$_{0.42}$"