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O: Fachverband Oberflächenphysik
O 83: Organic molecules on inorganic substrates: electronic, optical and other properties III
O 83.3: Vortrag
Donnerstag, 12. März 2026, 15:30–15:45, HSZ/0201
Stochastic spin-state transitions in an Fe(II) spin-crossover complex on Cu(111) — •Jasmeen Jasmeen1, Sujoy Karan1, Karl Ridier2, Reecht Gaël1, and Manuel Gruber1 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen, 47057 Duisburg, Germany — 22LCC, CNRS and Université de Toulouse, UPS, INP, 31077 Toulouse, France
Spin-crossover molecules can be switched between a low- (S = 0) and a high-spin (S = 1) state using external stimuli. Although the switching properties of crystalline powder were shown to strongly depend on the molecules environment, a full microscopic description is lacking. The switching of individual molecules in contact with a surface, evidenced in recent years, open new routes to further understand the impact of the local environment in the switching properties.
Using scanning tunneling microscopy at 4.5 K, we investigated the [Fe(HB(1,2,4-triazolyl)3)2] complex in direct contact with Cu(111) surface, focusing on the dynamics of its spin-state switching and the factors controlling switching behavior. The switching is triggered by injecting current at voltages above 0.5 V and monitored by the induced change in conductance.
We observe a drastic change of the switching yield with the local molecular environment, showing a clear dependence on both the number and the spin-state of neighboring molecules. These observations suggest that intermolecular interactions influence the switching efficiency.
Funding from the CRC 1242 is gratefully acknowledged.
Keywords: spin-crossover; scanning tunneling microscopy; molecular dynamics; low temperature