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We prepared superconducting and non-superconducting FeSe films on SrTiO3(001)substrates (FeSe/STO) and investigated the superconducting transition inducedby charge transfer between organic molecules and FeSe layers by low temperaturescanning tunneling microscopy and spectroscopy. At low coverage, donor- andacceptor-type molecules adsorbed preferentially on the non-superconducting andsuperconducting FeSe layers, respectively. Superconductivity was induced bydonor molecules on non-superconducting FeSe layer, while the superconductivitywas suppressed near acceptor molecules. The corresponding evolutions ofelectronic states and work function were also resolved by scanning tunnelingmicroscopy. These results illustrate the important role played by localelectron concentration in the superconducting transition of FeSe/STO.

Superconducting transition of FeSe/SrTiO3 induced by adsorption of semiconducting organic molecules