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Multimetastability, phototrapping, and thermal trapping of a metastable commensurate superstructure in a FeII spin-crossover compound

Pillet, S., Bendeif, E.-E., Bonnet, S., Shepherd, H.J., Guionneau, P. (2012) Multimetastability, phototrapping, and thermal trapping of a metastable commensurate superstructure in a FeII spin-crossover compound. Physical Review B - Condensed Matter and Materials Physics, 86 (6). p. 64106. ISSN 10980121 (ISSN). E-ISSN 1550-235X. (doi:10.1103/PhysRevB.86.064106) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
https://doi.org/10.1103/PhysRevB.86.064106

Abstract

The photoinduced switching and subsequent relaxation regime at cryogenic temperatures of the two-step spin-crossover compound [Fe(bapbpy)(NCS) 2] has been investigated by time-dependent photocrystallography. Upon photoexcitation from the low-spin (LS) state, a direct population of the metastable high-spin (HS) state occurs, without involving any intermediate structural state. The relaxation from the metastable HS state in isothermal conditions at 40K proceeds in two successive steps associated with two symmetry breaking processes. The first step corresponds to the cooperative transformation to an intermediate superstructure, characterized by a long-range-ordered [HS-LS-LS] motif coupled to a commensurate displacive modulation, and concomitant with a tripling of the c axis of the unit cell (C2/c space group). The stabilization of the intermediate state is driven by strong molecule-lattice coupling. In the second stage, the intermediate state undergoes a transformation twinning triggered by lattice strain towards the LS state. The two-step relaxation is reminiscent of the two-step thermal transition of [Fe(bapbpy)(NCS) 2] and evidences multimetastability in the light-induced or relaxation regime. The long-range-ordered [HS-LS-LS] superstructure has also been trapped by rapid quench cooling to very low temperature, and has been structurally characterized. © 2012 American Physical Society.

Item Type: Article
DOI/Identification number: 10.1103/PhysRevB.86.064106
Additional information: Unmapped bibliographic data: C7 - 064106 [EPrints field already has value set] LA - English [Field not mapped to EPrints] J2 - Phys. Rev. B Condens. Matter Mater. Phys. [Field not mapped to EPrints] AD - Laboratoire de Cristallographie, Résonance Magnétique et Modélisations, UMR CNRS 7036, Université de Lorraine, B.P. 70239, F-54506 Vandoeuvre-lès-Nancy, France [Field not mapped to EPrints] AD - Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, Netherlands [Field not mapped to EPrints] AD - Laboratoire de Chimie de Coordination (LCC), CNRS, 205 route de Narbonne, F-31077 Toulouse, France [Field not mapped to EPrints] AD - CNRS, Université de Bordeaux, ICMCB, 87 Avenue du Dr A. Schweitzer, F-33608 Pessac, France [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Subjects: Q Science > QD Chemistry > QD473 Physical properties in relation to structure
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Giles Tarver
Date Deposited: 22 Oct 2015 08:13 UTC
Last Modified: 23 Jan 2020 04:10 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50825 (The current URI for this page, for reference purposes)
Shepherd, H.J.: https://orcid.org/0000-0003-0832-4475
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