Effect of argon and hydrogen coating on the superconducting transition temperature of granular aluminum

Superconducting transition temperatures of pure Al, Al-Ar, and Al-${\mathrm{H}}_{2}$ mixtures condensed on substrates at 4.2 \ifmmode^\circ\else\textdegree\fi{}K are measured. A reduction in ${T}_{c}$ is observed for the Al-Ar mixture with respect to pure Al (${T}_{c}=3.46$ \ifmmode^\circ\else\textdegree\fi{}K), and a significant increase in ${T}_{c}$ is measured for Al-${\mathrm{H}}_{2}$. These results are discussed following recent observation of (i) ${T}_{c}$ depression in films with noble-gas overlayers, and (ii) the formation of Pd-${\mathrm{H}}_{2}$ mixture superconductors.

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