Increased superconducting transition temperature of a niobium thin film proximity coupled to gold nanoparticles using linking organic molecules

Eran Katzir*, Shira Yochelis, Felix Zeides, Nadav Katz, Yaov Kalcheim, Oded Millo, Gregory Leitus, Yuri Myasodeyov, Boris Ya Shapiro, Ron Naaman, Yossi Paltiel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

The superconducting critical temperature, T C, of thin Nb films is significantly modified when gold nanoparticles (NPs) are chemically linked to the Nb film, with a consistent enhancement when using 3 nm long disilane linker molecules. The T C increases by up to 10% for certain linker length and NP size. No change is observed when the nanoparticles are physisorbed with nonlinking molecules. Electron tunneling spectra acquired on the linked NPs below T C typically exhibit zero-bias peaks. We attribute these results to a pairing mechanism coupling electrons in the Nb and the NPs, mediated by the organic linkers.

Original languageAmerican English
Article number107004
JournalPhysical Review Letters
Volume108
Issue number10
DOIs
StatePublished - 8 Mar 2012

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