Effects of Oxygen Addition on Superconductivity of Sn Cluster-Assembled Films

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Sn cluster-assembled films have been produced using a plasma-gas-condensation cluster deposition apparatus with and without O2 gas addition in a sputtering chamber. The Sn clusters prepared without O2 gas addition agglomerated on the substrate and formed larger islands. They exhibited a broad superconducting transition below 3.7 K, suggesting that their transition temperature $T_{\text{c}}$ depends on their cluster size. When O2 gas was added to the cluster source, cluster size decreased and the agglomeration was prevented. The Sn cluster-assembled film prepared at an O2 gas flow rate $R_{\text{O$_{2}$}}=0.05$ sccm showed a sharp superconducting transition at $T_{\text{c}}=4.0$ K, which was higher than the $T_{\text{c}}$ of bulk $\beta$-Sn ($T_{\text{c}}{}^{\text{b}}=3.7$ K). Magnetization measurements indicated that the Sn cluster-assembled films prepared at $R_{\text{O$_{2}$}}\leq 0.1$ sccm were type II superconductors.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2006-10-15