Excited Spin-State Trapping in Spin Crossover Complexes on Ferroelectric Substrates
- 주제(기타) Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
- 설명문(일반) [Waeckerlin, Christian; Donati, Fabio; Singha, Aparajita; Baltic, Romana; Rusponi, Stefano] Ecole Polytech Fed Lausanne, Inst Phys, Stn 3, CH-1015 Lausanne, Switzerland; [Waeckerlin, Christian] Swiss Fed Labs Mat Sci & Technol, Nanoscale Mat Sci, Empa, CH-8600 Dubendorf, Switzerland; [Donati, Fabio] Inst for Basic Sci Korea, Ctr Quantum Nanosci, Seoul 03760, South Korea; [Donati, Fabio] Ewha Womans Univ, Dept Phys, Seoul 03760, South Korea; [Decurtins, Silvio; Liu, Shi-Xia] Univ Bern, Dept Chem & Biochem, Freiestr 3, CH-3012 Bern, Switzerland; [Dreiser, Jan] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland
- 등재 SCIE, SCOPUS
- 발행기관 AMER CHEMICAL SOC
- 발행년도 2018
- URI http://www.dcollection.net/handler/ewha/000000151899
- 본문언어 영어
- Published As http://dx.doi.org/10.1021/acs.jpcc.7b10941
초록/요약
We have studied thin films of Fe(II) spin crossover complexes deposited on differently poled ferroelectric PMN-PT ([Pb(Mg1/3Nb2/3)O-3](1-x)[PbTiO3](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.
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