Light-induced bistability in spin transition solids leading to thermal and optical hysteresis |
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| Authors: | A. Desaix O. Roubeau J. Jeftic J.G. Haasnoot K. Boukheddaden E. Codjovi J. Linarès M. Noguès F. Varret |
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| Affiliation: | (1) Laboratoire de Magnétisme et d'Optique, CNRS-Université de Versailles, 45 avenue des états-Unis, 78035 Versailles Cedex, France, FR;(2) Institut de Recherche sur la Réactivité, l'électrochimie et la Microporosité, CNRS-Université de Versailles, 45 avenue des états-Unis, 78035 Versailles Cedex, France, FR;(3) Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands, NL |
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| Abstract: | We investigate the behaviour of photo-excitable, bistable systems, under permanent light irradiation, in presence of relaxation towards the non-excited state. Cooperativity causes bistability of the steady state, leading to light-induced thermal and optical hysteresis (LITH and LIOH). The light-induced instability is expected to induce demixtion, i.e. the coexistence of domains of the two stable steady states. Such effects are evidenced by magnetic and reflectivity measurements on the spin-crossover solid solution: , with x= 0.3, 0.5, 0.85. Experimental data are in quantitative agreement with a simple macroscopic model which includes a non-linear relaxation term in the master equation. Received: 5 June 1997 / Accepted: 17 July 1998 |
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| Keywords: | PACS. 64.60.My Metastable phases - 70.60.Es Relaxation effects - 75.90.+w Other topics in magnetic properties and materials - 78.20.Nv Thermooptical and photothermal effects |
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