robust spin crossover and memristance across a single molecule · robust spin crossover and...
Post on 19-Jun-2020
3 Views
Preview:
TRANSCRIPT
1
Robust Spin Crossover and Memristance across a Single Molecule
Toshio Miyamachi*, Manuel Gruber, Vincent Davesne, Martin Bowen, Samy Boukari, Loïc
Joly, Fabrice Scheurer, Guillaume Rogez, Toyo Kazu Yamada, Philippe Ohresser, Eric
Beaurepaire, and Wulf Wulfhekel
*Correspondence to T. M. (toshio.miyamachi@kit.edu)
Supplementary Figures S1-S4
2
Supplementary Figures
Supplementary Figure S1, STM images of 2 monolayers of Fe-phen on Cu(100).
(a) Large-scale and (b) zoomed STM image of 2 ML Fe(phen)2(NCS) 2 thin film on Cu(100)
obtained at 4.6 K. Scanning parameters are 160 pA and + 0.6 V. The red and blue dotted boxes in
(b) denote Fe-phen molecules in the HS and LS states similar to single molecules adsorbed on
Cu(100).
3
Supplementary Figure S2, Frozen spin states of individual Fe-phen molecules on Cu(100).
(a) An STM image of individual Fe-phen HS and LS molecules on Cu(100). (b) Height profiles of
HS and LS molecules in (a). (c) Bias dependencies of the STM height profile for the HS state
(upper panel) and the LS state (lower panel). No switching of the states was observed. (d)
I(V)-curves recorded atop the center of an individual molecule adsorbed onto Cu(100) in the bias
range -1.8V to 1.8V reveal no hysteretic switching behaviour.
4
Supplementary Figure S3, Growth of whole CuN layer on Cu(100) surface.
(a) Large scale STM image of Cu(100) surface covered with a continuous CuN layer. (b)
Atomic resolution of the CuN/Cu(100) surface showing a c(2x2) reconstruction on the islands
and the trenches between the islands in agreement with previous results [30]. (c) An STM image
of Fe-phen single molecules on the CuN/Cu(100) surface. The molecule encircled by red (blue)
is in the HS (LS) state. Difference between HS and LS states is noticeable at the central regions
of the molecule as mentioned in the main manuscript. (d) A differentiated STM image with an
enhanced contrast of the CuN/Cu(100) surface with a Fe-phen single molecule. Atomic
resolution of CuN layer is clearly recognizable.
5
Supplementary Figure S4, Molecular states of individual Fe-phen molecules on
CuN/Cu(100).
dI/dV spectra recorded on (a) the center and (b) the ligand of the HS and the LS states on
CuN/Cu(100) and Cu(100) surfaces. The spectra recorded on the ligands of the HS and LS state
of the molecules on CuN/Cu(100) differ significantly in case they are adsorbed on
CuN/Cu(100) in agreement with expected electronic differences of the HS and LS state [31].
The spectra of the molecules on bare Cu(100) show only minor signals due to the strong
hybridization with the substrate. The spectra were acquired with a modulation bias of 10 mV
and a frequency of 723 Hz.
6
Supplementary References
[32] Leibsle, F. M. et al. Structure of the Cu{100}-c(2×2)N surface: A
scanning-tunneling-microscopy study. Phys. Rev. B. 47, 15865-15868 (1993).
[33] Reiher, M. Theoretical Study of the Fe(phen)2(NCS)2 Spin-Crossover Complex with
Reparametrized Density Functionals. Inorg, Chem. 41, 6928-6935 (2002).
top related