Electron transport through single Mn12 molecular magnets
H. B. Heersche, Z. de Groot, J. A. Folk, H. S. J. van der Zant, C., Romeike, M. R. Wegewijs, L. Zobbi, D. Barreca, E. Tondello, A. Cornia
TL;DR
This study investigates electron transport through a single Mn12 molecular magnet, revealing current suppression and negative differential conductance related to magnetic excitations, advancing understanding of molecular spintronics.
Contribution
It provides experimental measurements and theoretical analysis of electron transport in a single Mn12 molecule, highlighting magnetic effects on conductance.
Findings
Regions of complete current suppression observed
Negative differential conductance on anisotropy energy scale
Transport blocked by non-degenerate spin multiplets
Abstract
We report transport measurements through a single-molecule magnet, the Mn12 derivative [Mn12O12(O2C-C6H4-SAc)16(H2O)4], in a single-molecule transistor geometry. Thiol groups connect the molecule to gold electrodes that are fabricated by electromigration. Striking observations are regions of complete current suppression and excitations of negative differential conductance on the energy scale of the anisotropy barrier of the molecule. Transport calculations, taking into account the high-spin ground state and magnetic excitations of the molecule, reveal a blocking mechanism of the current involving non-degenerate spin multiplets.
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