Giant magnetic exchange coupling in rhombus-shaped nanographenes with zigzag periphery
arXiv:2003.03577 · doi:10.1038/s41557-021-00678-2
Abstract
Nanographenes with zigzag edges are predicted to manifest non-trivial pi-magnetism resulting from the interplay of hybridization of localized frontier states and Coulomb repulsion between valence electrons. This provides a chemically tunable platform to explore quantum magnetism at the nanoscale and opens avenues toward organic spintronics. The magnetic stability in nanographenes is thus far limited by the weak magnetic exchange coupling which remains below the room temperature thermal energy. Here, we report the synthesis of large rhombus-shaped nanographenes with zigzag periphery on gold and copper surfaces. Single-molecule scanning probe measurements unveil an emergent magnetic spin-singlet ground state with increasing nanographene size. The magnetic exchange coupling in the largest nanographene, determined by inelastic electron tunneling spectroscopy, exceeds 100 meV or 1160 K, which outclasses most inorganic nanomaterials and remarkably survives on a metal electrode.
arXiv comment4 figures plus supplementary information
References in corpus (22)
- Separable Dual Space Gaussian Pseudo-potentials
- Quantum Spin Liquids
- Emergence of magnetism in graphene materials and nanostructures
- Renormalization of Molecular Electronic Levels at Metal-Molecule Interfaces
- Magnetism in graphene nano-islands
- AiiDA: Automated Interactive Infrastructure and Database for Computational Science
- Strength of effective Coulomb interactions in graphene and graphite
- Metallic Graphene Nanodisks
- Giant edge state splitting at atomically precise zigzag edges
- Topological Frustration in Graphene Nanoflakes: Magnetic Order and Spin Logic Devices
- Optimal Hubbard models for materials with nonlocal Coulomb interactions: graphene, silicene and benzene
- Spin Excitations and Correlations in Scanning Tunneling Spectroscopy
- Single Spin Localization and Manipulation in Graphene Open-Shell Nanostructures
- Uncovering the Triplet Ground State of Triangular Graphene Nanoflakes Engineered with Atomic Precision on a Metal Surface
- Colloquium: Atomic spin chains on surfaces
- Collective All-Carbon Magnetism in Triangulene Dimers
- Control of single-spin magnetic anisotropy by exchange coupling
- Exchange rules for diradical π-conjugated hydrocarbons
- Role of Kekulé and Non-Kekulé Structures in the Radical Character of Alternant Polycyclic Aromatic Hydrocarbons: A TAO-DFT Study
- Magnetic Correlations in Short and Narrow Graphene Armchair Nanoribbons
- Single spin universal Boolean logic
- Magnetic and electronic phase crossovers in graphene nanoflakes
Cited by in corpus (22)
- Aza-Triangulene: On-Surface Synthesis, Electronic and Magnetic Properties
- On-surface synthesis and collective spin excitations of a triangulene-based nanostar
- Magnetic Interactions Between Radical Pairs in Chiral Graphene Nanoribbons
- Detecting the spin-polarization of edge states in graphene nanoribbons
- Synthesis and characterization of super-nonazethrene
- Building spin-1/2 antiferromagnetic Heisenberg chains with diaza-nanographenes
- Addressing electron spins embedded in metallic graphene nanoribbons
- Renormalization of spin excitations and Kondo effect in open shell nanographenes
- Theory of intermolecular exchange in coupled spin-1/2 nanographenes
- Probing local moments in nanographenes with electron tunneling spectroscopy
- Conformational tuning of magnetic interactions in coupled nanographenes
- Local Probe Structure Isomerization in a One-Dimensional Molecular Array
- On-surface Synthesis of a Ferromagnetic Molecular Spin Trimer
- Magnetic frustration and fractionalization in oligo(indenoindenes)
- Artificially built Kondo chains with organic radicals on metallic surfaces: new model system of heavy fermion quantum criticality
- Triangle Counting Rule: An Approach to Forecast the Magnetic Properties of Benzenoid Polycyclic Hydrocarbons
- Doublon production in correlated materials by multiple ion impacts
- Systematic Modulation of Charge and Spin in Graphene Nanoribbons on MgO
- Designer polyradical nanographenes with strong spin entanglement and perturbation resilience via Clar's goblet extension
- Synthesis and characterization of a -extended Clar's goblet
- Hyperfine interactions in open-shell planar -carbon nanostructures
- The multiconfigurational ground state of a diradicaloid characterized at the atomic scale