Abstract
T. Claeson's measurements of superconducting transition temperatures Tc of lead-thallium alloys have been repeated in the composition range 47-53 at.% Tl. In contrast to Claeson's findings, no dip in the Tc versus composition plot has been found. The exceptional behavior of Claeson's specimens with 49-50 at.% Tl seems to be due to sample inhomogeneity.

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