title: Bilayer of Terbium Double-Decker Single-Molecule Magnets.
abstract: We report a low-temperature scanning tunneling microscopy and spectroscopy study of the structural and electronic properties of a bilayer of terbium double-decker (bis(phthalocyaninato)terbium(III), TbPc2) molecules on Au(111) at 5 K. The TbPc2molecules are found to adsorb flat on top of a first compact TbPc2monolayer on Au(111), forming a square-like packing similar to the underlying first layer. Their frontier-orbital electronic structure, measured by tunneling conductance spectroscopy, clearly differs from that of the underlying first monolayer. Our results of second-layer molecules indicate the absence of, both, hybrid molecule-substrate electronic states close to the Fermi level and a zero-bias Kondo resonance. We attribute these findings to a decreased electronic coupling with the Au(111) substrate.
authors.affiliation: Institute of Semiconductor and Solid State Physics, Johannes Kepler University , 4040 Linz, Austria.
authors.forename: Giulia
authors.initials: G
authors.lastname: Serrano
authors.affiliation: Institute of Semiconductor and Solid State Physics, Johannes Kepler University , 4040 Linz, Austria.
authors.forename: Stefan
authors.initials: S
authors.lastname: Wiespointner-Baumgarthuber
authors.affiliation: Institute of Semiconductor and Solid State Physics, Johannes Kepler University , 4040 Linz, Austria.
authors.forename: Stefano
authors.initials: S
authors.lastname: Tebi
authors.affiliation: Institute of Nanotechnology, Karlsruhe Institute of Technology , 76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: Svetlana
authors.initials: S
authors.lastname: Klyatskaya
authors.affiliation: Institute of Nanotechnology, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany; Institut de Physique et de Chimie des Materiaux de Strasbourg, Universite de Strasbourg, CNRS UMP 7504, 23 Rue du Loess, Strasbourg 67034 Cedex 2, France.
authors.forename: Mario
authors.initials: M
authors.lastname: Ruben
authors.affiliation: Institute of Semiconductor and Solid State Physics, Johannes Kepler University , 4040 Linz, Austria.
authors.forename: Reinhold
authors.initials: R
authors.lastname: Koch
authors.affiliation: Institute of Semiconductor and Solid State Physics, Johannes Kepler University , 4040 Linz, Austria.
authors.forename: Stefan
authors.initials: S
authors.lastname: Müllegger