Comment on “influence of composition on the superconducting transition temperature of alloys with the A-15 structure”

In a recent paper it is reported that Tc is a maximum for compositions which are Al rich with respect to stoichiometry in Nb-Al alloys having the A-15 structure. We call attention to the fact that this result is at variance with reports in the literature on this system. We also clarify some remarks made in that paper on previous works of ours on other systems.