UNIGE document Scientific Article
previous document  unige:17026  next document
add to browser collection
Title

Patterns During Photoexcitation and High-Spin → Low-Spin Relaxation in [Fe(ptz)6](BF 4 ) 2 Spin Transition Crystal

Authors
Varret, François
Roubeau, Olivier
Matsarski, Marie
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 transitionPhotographyLaser photoexcitationInstability
Identifiers
Full text
Structures
Research group Groupe Hauser
Citation
(ISO format)
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. https://archive-ouverte.unige.ch/unige:17026

229 hits

0 download

Update

Deposited on : 2011-09-26

Export document
Format :
Citation style :