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

Christian Wäckerlin, Fabio Donati, Aparajita Singha, Romana Baltic, Silvio Decurtins, Shi Xia Liu, Stefano Rusponi, Jan Dreiser

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

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.

Original languageEnglish
Pages (from-to)8202-8208
Number of pages7
JournalJournal of Physical Chemistry C
Volume122
Issue number15
DOIs
StatePublished - 19 Apr 2018

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