Patterns During Photoexcitation and High-Spin → Low-Spin Relaxation in [Fe(ptz)6](BF 4 ) 2 Spin Transition Crystal
|Published in||Molecular Crystals and Liquid Crystals. 1999, vol. 335, no. 1, p. 511-520|
|Abstract||The propagation of the high-spin (HS) → low-spin (LS) relaxation at 53 K in a single crystal of the iron (II) spin-crossover compound [Fe(ptz)6](BF4)2 was followed by photography, after inducing the local photoexcitation to the metastable HS state at 20 K using the single wavelength (457 nm Ar± ion laser) irradiation. The photoinduced formation of the HS—LS patterns with a characteristic diameter of some 0.1 mm was observed to occur inhomogeneously at a macroscopic scale already during photoexcitation. The contrast between the HS (transparent) and the LS (purple) regions was amplified during relaxation. The effect is described in terms of a transient instability, for which a microscopic model in the mean-field approximation is proposed. The mechanism for the development of patterns at the macroscopic scale is discussed.|
|Keywords||Spin transition — Photography — Laser photoexcitation — Instability|
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Faculté des sciences / Section de chimie et biochimie / Département de chimie minérale, analytique et appliquée
|Research group||Groupe Hauser|
|JEFTIC, Jelena et al. Patterns During Photoexcitation and High-Spin → Low-Spin Relaxation in [Fe(ptz)6](BF 4 ) 2 Spin Transition Crystal. In: Molecular Crystals and Liquid Crystals, 1999, vol. 335, n° 1, p. 511-520. doi: 10.1080/10587259908028892 https://archive-ouverte.unige.ch/unige:17026|