Probing photoinduced spin states in spin-crossover molecules with neutron scattering - Archive ouverte HAL
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2017

Probing photoinduced spin states in spin-crossover molecules with neutron scattering

Karl Ridier
G. A Craig
  • Fonction : Auteur
F. Damay
M. Murrie
  • Fonction : Auteur
G. Chaboussant

Résumé

We report a neutron-scattering investigation of the spin-crossover compound [Fe(ptz) 6 ](BF 4) 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. Finally, with inelastic neutron scattering (INS) we have observed magnetic transitions arising from the photo-induced 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 of the S = 2 ground state. The obtained parameters are D ≈ −1.28 ± 0.03 meV and |E| ≈ 0.08 ± 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.
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Dates et versions

hal-02112363 , version 1 (26-04-2019)

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Karl Ridier, G. A Craig, F. Damay, T. Fennell, M. Murrie, et al.. Probing photoinduced spin states in spin-crossover molecules with neutron scattering. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2017, 95 (9), ⟨10.1103/PhysRevB.95.094403⟩. ⟨hal-02112363⟩
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