Unravelling the Open-Shell Character of Peripentacene on Au(111)
Status PubMed-not-MEDLINE Jazyk angličtina Země Spojené státy americké Médium print-electronic
Typ dokumentu časopisecké články
- Publikační typ
- časopisecké články MeSH
Polycyclic aromatic hydrocarbons (PAHs) are a family of organic compounds comprising two or more fused aromatic rings which feature manifold applications in modern technology. Among these species, those presenting an open-shell magnetic ground state are of particular interest for organic electronic, spintronic, and non-linear optics and energy storage devices. Within PAHs, special attention has been devoted in recent years to the synthesis and study of the acene and fused acene (periacene) families, steered by their decreasing HOMO-LUMO gap with length and predicted open-shell character above some size. However, an experimental fingerprint of such magnetic ground state has remained elusive. Here, we report on the in-depth electronic characterization of isolated peripentacene molecules on a Au(111) surface. Scanning tunnelling spectroscopy, complemented by computational investigations, reveals an antiferromagnetic singlet ground state, characterized by singlet-triplet inelastic excitations with an experimental effective exchange coupling (Jeff) of 40.5 meV. Our results deepen the fundamental understanding of organic compounds with magnetic ground states, featuring perspectives in carbon-based spintronic devices.
Departamento de Física de la Materia Condensada Universidad Autónoma de Madrid 28049 Madrid Spain
IMDEA Nanoscience C Faraday 9 Campus de Cantoblanco 28049 Madrid Spain
Institute of Physics of the Czech Academy of Science CZ 16253 Praha Czech Republic
Instituto de Ciencia de Materiales de Madrid CSIC Cantoblanco 28049 Madrid Spain
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