Journal
NATURE PHYSICS
Volume 12, Issue 9, Pages 867-873Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS3737
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Funding
- Deutsche Forschungsgemeinschaft [AN275/7-1]
- NIC Julich [HHB00, HMS17]
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The magnetic properties of nanostructures that consist of a small number of atoms or molecules are typically determined by magnetic exchange interactions. Here, we show that non-magnetic, chemical interactions can have a similarly decisive effect if spin-moment-carrying orbitals extend in space and therefore allow the direct coupling of magnetic properties to wavefunction overlap and the formation of bonding and antibonding orbitals. We demonstrate this for a dimer of metal-molecule complexes on the Au(111) surface. A changing wavefunction overlap between the two monomers drives the surface-adsorbed dimer through a quantum phase transition from an underscreened triplet to a singlet ground state, with one configuration being located extremely close to a quantum critical point.
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