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

Abstract

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

17 pages, 5 figures

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Cited by in corpus (3)

• Real-Space Investigation of the Charge Density Wave in VTe2 Monolayer with Rotational and Mirror Symmetries Broken
• Superconductivity of the FeSe/SrTiO3 Interface in the View of BCS-BEC Crossover
• Tuning the magnetism of the top-layer FeAs on BaFe${}_2$As${}_2$(001): First-principles study