2024-03-29T06:43:22Z
https://archive.materialscloud.org/xml
oai:materialscloud.org:460
2020-07-15T16:19:24Z
DOI
Mishra, Shantanu
Beyer, Doreen
Eimre, Kristjan
Kezilebieke, Shawulienu
Berger, Reinhard
Gröning, Oliver
Pignedoli, Carlo A.
Müllen, Klaus
Liljeroth, Peter
Ruffieux, Pascal
Feng, Xinliang
Fasel, Roman
2020-07-15
The chemical versatility of carbon imparts manifold properties to organic compounds, where magnetism remains one of the most desirable but elusive. Polycyclic aromatic hydrocarbons, also referred to as nanographenes, show a critical dependence of electronic structure on the topologies of the edges and the π-electron network, which makes them model systems with which to engineer unconventional properties including magnetism. In 1972, Erich Clar envisioned a bow-tie-shaped nanographene, C38H18, where topological frustration in the π-electron network renders it impossible to assign a classical Kekulé structure without leaving unpaired electrons, driving the system into a magnetically non-trivial ground state. In this record we include data needed to support our recent work where we demonstrate the experimental realization and in-depth characterization of this emblematic nanographene, known as Clar’s goblet. Scanning tunnelling microscopy and spin excitation spectroscopy of individual molecules on a gold surface reveal a robust antiferromagnetic order with an exchange-coupling strength of 23 meV, exceeding the Landauer limit of minimum energy dissipation at room temperature. Through atomic manipulation, we realize switching of magnetic ground states in molecules with quenched spins. Our results provide direct evidence of carbon magnetism in a hitherto unrealized class of nanographenes, and prove a long-predicted paradigm where topological frustration entails unconventional magnetism, with implications for room-temperature carbon-based spintronics.
https://archive.materialscloud.org/record/2020.79
doi:10.24435/materialscloud:ha-t5
mcid:2020.79
oai:materialscloud.org:460
en
Materials Cloud
info:eu-repo/semantics/openAccess
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode
MARVEL/DD3
SNSF
ERC
Clar goblet
Kondo
nanographene
ab initio
Topological frustration induces unconventional magnetism in a nanographene
Dataset