On-chip tuning of superconductivity in fullerides via current-driven Rb+ intercalation Shchukin, Konstantin P. Gallego Lacey, Oliver N. Coquinot, Baptiste ; https://orcid.org/0000-0001-5524-596X Jakowski, Jacek Huang, Jingsong Staudenmayer, Patrik Falke, Yannic Pandeya, Ram Prakash Grüneis, Alexander fulleride intercalation alkali metal superconductivity Raman ddc:530 An in-operando electro-intercalation method for the on-chip synthesis of alkali-metal-intercalated materials and their Raman spectroscopic and transport characterization in ultrahigh vacuum (UHV) is developed. We apply this method to synthesize fulleride superconductors via Rb+ intercalation into a C60 film. During the intercalation, we monitor the stoichiometry via UHV-Raman spectroscopy and probe superconductivity via transport measurements. An increase of the superconducting transition temperature from 7.0 K to 14.5 K is observed when the stoichiometry is tuned from Rb2.7C60 to Rb3C60. In our experiment, an ionic Rb+ flux into the host material is induced by an applied electronic current via a Butler–Volmer-type mechanism. Electro-intercalation captivates through improved stoichiometric precision, the ability to smoothly vary stoichiometry via duration of current application, and the absence of a lower limit of the volume of the host material. It represents a powerful concept for the on-chip synthesis of intercalated materials, battery research, and beyond. American Chemical Society 2026 info:eu-repo/semantics/article doc-type:article text http://purl.org/coar/resource_type/c_2df8fbb1 https://research-explorer.ista.ac.at/record/22145 https://research-explorer.ista.ac.at/download/22145/22150 Shchukin KP, Gallego Lacey ON, Coquinot B, et al. On-chip tuning of superconductivity in fullerides via current-driven Rb+ intercalation. <i>ACS Nano</i>. 2026;20(24):17360-17372. doi:<a href="https://doi.org/10.1021/acsnano.6c02466">10.1021/acsnano.6c02466</a> eng info:eu-repo/semantics/altIdentifier/doi/10.1021/acsnano.6c02466 info:eu-repo/semantics/altIdentifier/issn/1936-0851 info:eu-repo/semantics/altIdentifier/e-issn/1936-086X info:eu-repo/semantics/altIdentifier/pmid/42260723 info:eu-repo/semantics/openAccess