Formation of local spin-state concentration waves during the relaxation from photoinduced state in a spin-crossover polymer - Archive ouverte HAL Access content directly
Journal Articles Acta crystallographica Section B: Structural crystallography and crystal chemistry Year : 2017

Formation of local spin-state concentration waves during the relaxation from photoinduced state in a spin-crossover polymer

Abstract

The complex relaxation from the photoinduced high-spin phase (PIHS) to the low-spin phase of the bimetallic two-dimensional coordination spin-crossover polymer [Fe[(Hg(SCN))](4,4'-bipy)] is reported. During the thermal relaxation, commensurate and incommensurate spin-state concentration waves (SSCWs) form. However, contrary to the steps forming at thermal equilibrium, associated with long-range SSCW order, the SSCWs forming during the relaxation from the PIHS phase correspond to short-range order, revealed by diffuse X-ray scattering. This is interpreted as resulting from the competition between the two types of SSCW order and another structural symmetry breaking, due to ligand ordering, occurring at low temperature and precluding long-range SSCW order.
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Dates and versions

hal-01552077 , version 1 (30-06-2017)

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Céline Mariette, Elzbieta Trzop, Serhane Zerdane, Pierre Fertey, Daopeng Zhang, et al.. Formation of local spin-state concentration waves during the relaxation from photoinduced state in a spin-crossover polymer. Acta crystallographica Section B: Structural crystallography and crystal chemistry, 2017, 73 (4), pp.660-668. ⟨10.1107/S2052520617007685⟩. ⟨hal-01552077⟩
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