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

K. Ridier, G. A. Craig, F. Damay, T. Fennell, M. Murrie, G. Chaboussant

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We report a neutron-scattering investigation of the spin-crossover compound [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. 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.
LanguageEnglish
Article number094403
Number of pages6
JournalPhysical Review B
Volume95
Issue number9
DOIs
Publication statusPublished - 3 Mar 2017

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Inelastic neutron scattering
Neutron scattering
crossovers
neutron scattering
Molecules
Methyl Green
molecules
Neutron diffraction
Magnetic properties
inelastic scattering
Orbits
Irradiation
Infrared radiation
Crystals
Temperature
crystal field theory
neutron diffraction
magnetic properties
orbits
irradiation

Keywords

  • photoinduced spin states
  • neutron scattering

Cite this

Ridier, K. ; Craig, G. A. ; Damay, F. ; Fennell, T. ; Murrie, M. ; Chaboussant, G. / Probing photoinduced spin states in spin-crossover molecules with neutron scattering. In: Physical Review B. 2017 ; Vol. 95, No. 9.
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abstract = "We report a neutron-scattering investigation of the spin-crossover compound [Fe(ptz)6](BF4)2,which undergoesan abrupt thermal spin transition from high spin (HS), S = 2, to low spin (LS), S = 0, around 135 K. The HSmagnetic state can be restored at low temperature under blue/green light irradiation. We have developed aspecially designed optical setup for neutron scattering to address the magnetic properties of the light-inducedHS state. By using neutron diffraction, we demonstrate that significant HS/LS ratios (of up to 60{\%}) can beobtained with this experimental setup on a sample volume considered large (400 mg), while a complete recoveryof the LS state is achieved using near-infrared light. Finally, with inelastic neutron scattering (INS) we haveobserved magnetic transitions arising from the photo-induced metastable HS S = 2 state split by crystal-field andspin-orbit coupling.We interpret the INS data assuming a spin-only model with a zero-field splitting of the S = 2ground state. The obtained parameters are D ≈ −1.28 ± 0.03 meV and |E| ≈ 0.08 ± 0.03 meV. The presentresults show that in situ magnetic inelastic neutron-scattering investigations on a broad range of photomagneticmaterials are now possible.",
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Probing photoinduced spin states in spin-crossover molecules with neutron scattering. / Ridier, K.; Craig, G. A.; Damay, F.; Fennell, T.; Murrie, M.; Chaboussant, G.

In: Physical Review B, Vol. 95, No. 9, 094403, 03.03.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Probing photoinduced spin states in spin-crossover molecules with neutron scattering

AU - Ridier, K.

AU - Craig, G. A.

AU - Damay, F.

AU - Fennell, T.

AU - Murrie, M.

AU - Chaboussant, G.

PY - 2017/3/3

Y1 - 2017/3/3

N2 - We report a neutron-scattering investigation of the spin-crossover compound [Fe(ptz)6](BF4)2,which undergoesan abrupt thermal spin transition from high spin (HS), S = 2, to low spin (LS), S = 0, around 135 K. The HSmagnetic state can be restored at low temperature under blue/green light irradiation. We have developed aspecially designed optical setup for neutron scattering to address the magnetic properties of the light-inducedHS state. By using neutron diffraction, we demonstrate that significant HS/LS ratios (of up to 60%) can beobtained with this experimental setup on a sample volume considered large (400 mg), while a complete recoveryof the LS state is achieved using near-infrared light. Finally, with inelastic neutron scattering (INS) we haveobserved magnetic transitions arising from the photo-induced metastable HS S = 2 state split by crystal-field andspin-orbit coupling.We interpret the INS data assuming a spin-only model with a zero-field splitting of the S = 2ground state. The obtained parameters are D ≈ −1.28 ± 0.03 meV and |E| ≈ 0.08 ± 0.03 meV. The presentresults show that in situ magnetic inelastic neutron-scattering investigations on a broad range of photomagneticmaterials are now possible.

AB - We report a neutron-scattering investigation of the spin-crossover compound [Fe(ptz)6](BF4)2,which undergoesan abrupt thermal spin transition from high spin (HS), S = 2, to low spin (LS), S = 0, around 135 K. The HSmagnetic state can be restored at low temperature under blue/green light irradiation. We have developed aspecially designed optical setup for neutron scattering to address the magnetic properties of the light-inducedHS state. By using neutron diffraction, we demonstrate that significant HS/LS ratios (of up to 60%) can beobtained with this experimental setup on a sample volume considered large (400 mg), while a complete recoveryof the LS state is achieved using near-infrared light. Finally, with inelastic neutron scattering (INS) we haveobserved magnetic transitions arising from the photo-induced metastable HS S = 2 state split by crystal-field andspin-orbit coupling.We interpret the INS data assuming a spin-only model with a zero-field splitting of the S = 2ground state. The obtained parameters are D ≈ −1.28 ± 0.03 meV and |E| ≈ 0.08 ± 0.03 meV. The presentresults show that in situ magnetic inelastic neutron-scattering investigations on a broad range of photomagneticmaterials are now possible.

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KW - neutron scattering

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