Journal
NANO LETTERS
Volume 10, Issue 1, Pages 105-110Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl9029785
Keywords
Transition metal complex; single-molecule electronics; electromigration; molecular spintronics; spin blockade
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Funding
- Dutch Organization for Fundamental Research on Matter (FOM)
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)
- EU [213609]
- Danish Agency for Science, Technology, and Innovation
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We demonstrate an electrically controlled high-spin (S = 5/2) to low-spin (S = 1/2) transition in a three-terminal device incorporating a single Mn(2+) ion coordinated by two terpyridine ligands. By adjusting the gate-voltage we reduce the terpyridine moiety and thereby strengthen the ligand-field on the Mn-atom. Adding a single electron thus Stabilizes the low-spin configuration and the corresponding sequential tunnelling current is suppressed by spin-blockade. From low-temperature inelastic cotunneling spectroscopy, we infer the magnetic excitation spectrum of the molecule and uncover also a strongly gate-dependent singlet-triplet splitting on the low-spin side. The measured bias-spectroscopy is shown to be consistent with an exact diagonalization of the Mn-complex, and an interpretation of the data is given in terms of a simplified effective model.
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