Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 52: Focus Session: Spins on Surfaces studied by Atomic Scale Spectroscopies V
O 52.6: Vortrag
Mittwoch, 20. März 2024, 16:30–16:45, MA 004
Stable π radical BDPA on Cu(100): adsorption and Kondo signature — •Jacob Teeter1, Daniel Miller2, and Stefan Müllegger1 — 1Solid State Physics Department, Johannes Kepler University Linz, 4040 Linz, Austria — 2Hofstra University, New York, USA
Introduction
Stable organic radicals can serve as model systems for investigating metal-free magnetic phenomena. We have investigated one such species, α, γ-bisdiphenylene-β-phenylallyl (BDPA), at the single-molecule level on Cu(100).
Methods
Ultra-high vacuum (UHV) scanning tunneling microscopy (STM) and spectroscopy (STS) were performed using a commercial Omicron Polar STM at 6 K. Spectroscopic measurements were acquired with a W tip using an external lock-in amplifier and a typical modulation voltage of 2.5 mV. The substrate employed was a Cu(100) crystal obtained from Surface Preparation Laboratory. Density functional theory computations which account for London dispersion forces were performed to elucidate upon the adsorption structure and orientation of BDPA on the Cu(100) surface.
Results and Discussion
Our investigations revealed structural and electronic features of BDPA on Cu(100), including a preferential adsorption orientation and the presence of a Kondo-like feature in differential conductance measurements that suggests survival of the unpaired electron spin.
Keywords: organic radical; Kondo; single-molecule