Excited Spin-State Trapping in Spin Crossover Complexes on Ferroelectric Substrates

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Title
Excited Spin-State Trapping in Spin Crossover Complexes on Ferroelectric Substrates
Author(s)
Christian Wackerlin; Fabio Donati; Aparajita Singha; Romana Baltic; Silvio Decurtins; Shi-Xia Liu; Stefano Rusponi; Jan Dreiser
Publication Date
2018-04
Journal
Journal of Physical Chemistry C, v.122, no.15, pp.8202 - 8208
Publisher
ACS Publications
Abstract
We have studied thin films of Fe(II) spin crossover complexes deposited on differently poled ferroelectric PMN-PT ([Pb(Mg1/3Nb2/3)O3]1-x[PbTiO3]x, x = 0.32) substrates by X-ray absorption spectroscopy. The X-ray spectra reveal the temperature-driven conversion between high-spin and low-spin states without any observable effect of the ferroelectric polarization on the spin state of the molecules down to 100 K. In the soft X-ray-induced excited spin-state trapping (SOXIESST) regime at 3 K, large differences occur between the two ferroelectric polarizations. The efficiency of X-rays in exciting the molecules to the high-spin state is more than an order of magnitude larger when the ferroelectric dipoles of the substrate are pointing toward the surface compared to the opposite polarization. We explain our findings by a modulation of the polarization-dependent efficiency of the scattering of X-ray-generated secondary electrons at the molecules. Our results provide a deep insight into the SOXIESST mechanism and suggest that such molecules could be used as detectors for electrons traveling in the substrate at energies lower than the substrate electron affinity. © 2018 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/4731
ISSN
1932-7447
Appears in Collections:
Center for Quantum Nanoscience(양자나노과학 연구단) > Journal Papers (저널 논문)
Files in This Item:
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