Figure 1: SCO Fe-phen molecules on bare Cu(100).
From: Robust spin crossover and memristance across a single molecule
(a) Three-dimensional model of a Fe-phen molecule. (b) Simplified electronic configuration of the Fe(II) 3d states in the ligand field. For large ligand fields (ΔLS), the electrons fully occupy the t2g states and the total spin S is quenched, while for low ligand fields (ΔHS), the Fe(II) ion is in the spin state S=2. (c) STM image of isolated Fe-phen molecules on the Cu(100) surface with two conformations denoted as I (HS) and II (LS). Image size is 13×13 nm2. (d) dI/dV spectra recorded on the centre of type I (HS), type II (LS) molecules and Cu(100) surface. The colours indicate the position, where the spectra were taken and are marked as coloured dots of (e). The black dotted line denotes a Fano fit to the Kondo resonance. (e) STM topography of a pair of type I (HS) and type II (LS) molecules and (f) corresponding dI/dV map (bottom) obtained at +10 mV showing the position of the Kondo resonance at the centre of the HS molecule. Image sizes are 6.7×3.7 nm2.
