Effects of adsorbed molecular ordering to the superconductivity of a two-dimensional atomic layer crystalShow others and affiliations
2023 (English)In: Physical Review Materials, E-ISSN 2475-9953, Vol. 7, no 2, article id 024805Article in journal (Refereed) Published
Abstract [en]
The effect of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) adsorption on the physical properties of the two-dimensional (2D) atomic layer superconductor (ALSC) In/Si(111)-(7×3) has been studied by angle-resolved photoelectron spectroscopy, transport measurements, and scanning tunneling microscopy. Hole doping from the adsorbed molecules has been reported to increase the superconducting transition temperature Tc of this ALSC, and the molecular spin tends to decrease it. Owing to its large electron affinity and its nonexistent spin state, the adsorption of PTCDA was expected to increase Tc. However, the PTCDA adsorption dopes only a small number of holes in the In layers and causes a suppression of Tc with a sharp increase in the normal-state sheet resistance followed by an insulating transition. Taking the disordering of the arrangement of PTCDA into account, we conclude that the increase in resistance is due to the localization effect originating from the random potential that is induced by the disordered PTCDA molecules. The present result also indicates the importance of the crystallinity of a 2D molecular film adsorbed on ALSCs.
Place, publisher, year, edition, pages
American Physical Society, 2023. Vol. 7, no 2, article id 024805
Keywords [en]
Crystallinity, Electron affinity, Molecules, Photoelectron spectroscopy, Scanning tunneling microscopy, Semiconductor doping, Superconducting materials, Superconducting transition temperature, Adsorbed molecules, Angle resolved photoelectron spectroscopy, Atomic layer, Hole-doping, Layer crystals, Molecular ordering, Molecular spins, Perylenetetracarboxylic dianhydride, Transport measurements, Two-dimensional, Adsorption
National Category
Condensed Matter Physics
Research subject
Materials Science; Physics
Identifiers
URN: urn:nbn:se:kau:diva-94165DOI: 10.1103/PhysRevMaterials.7.024805ISI: 001000951700003Scopus ID: 2-s2.0-85149657857OAI: oai:DiVA.org:kau-94165DiVA, id: diva2:1748784
Funder
Vinnova, 2018-04969Swedish Research Council Formas, 2019-02496Swedish Research Council, 2018-071522023-04-042023-04-042023-07-13Bibliographically approved