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The physical properties and structural evolution of the MX$_2$-type solidsolution Au$_{1-x}$Pd$_x$Te$_2$ are reported. The end member AuTe$_2$ is anormal metal with a monoclinic distorted CdI$_2$-type structure with preformedTe-Te dimers. A monoclinic--trigonal structural phase transition at a finitetemperature occurs upon Pd substitution and is suppressed to zero temperaturenear $x$ = 0.55, and a superconducting phase with a maximum $T_{\rm c}$ = 4.65K emerges. A clear indication of strong coupling superconductivity is observednear the composition of the structural instability. The competitiverelationship between Te-Te dimers and superconductivity is proposed.

Composition-induced structural instability and strong-coupling superconductivity in Au1-xPdxTe2