Ridier, K., Craig, G.A., Damay, F., Fennell, T., Murrie, M. and Chaboussant, G. (2017) Probing photoinduced spin states in spin-crossover molecules with neutron scattering. Physical Review B, 95(9), 094403. (doi: 10.1103/PhysRevB.95.094403)
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Abstract
We report a neutron scattering investigation of the spin crossover compound \rm [Fe(ptz)6](BF4)2 which undergoes an abrupt thermal spin-transition from high-spin (HS) S=2 to low-spin (LS) S=0 around 135 K. The HS magnetic state can be restored at low temperature under blue/green light irradiation. We have developed a specially designed optical setup for neutron scattering to address the magnetic properties of the light-induced HS state. By using neutron diffraction, we demonstrate that significant HS/LS ratios (of up to 60 \%) can be obtained with this experimental setup on a sample volume considered large (400 mg), while a complete recovery of the LS state is achieved using near infrared light. With inelastic neutron scattering (INS) we have observed, for the first time in a photo-induced phase, magnetic transitions arising from the metastable HS S=2 state split by crystal field and spin-orbit coupling. We interpret the INS data assuming a spin-only model with a zero-field splitting (ZFS) of the S=2 ground state. The obtained parameters are D \approx -1.28 \pm 0.03 meV and |E| \approx 0.08 \pm 0.03 meV. The present results show that in situ magnetic inelastic neutron scattering investigations on a broad range of photomagnetic materials are now possible.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Craig, Dr Gavin and Murrie, Professor Mark |
| Authors: | Ridier, K., Craig, G.A., Damay, F., Fennell, T., Murrie, M., and Chaboussant, G. |
| College/School: | College of Science and Engineering > School of Chemistry |
| Journal Name: | Physical Review B |
| Publisher: | American Physical Society |
| ISSN: | 1098-0121 |
| ISSN (Online): | 1550-235X |
| Copyright Holders: | Copyright © 2017 American Physical Society |
| First Published: | First published in Physical Review B 95(9): 094403 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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