A two-sublattice model for light-induced hysteresis in spin-crossover solids:: symmetry breaking and kinetic effects

被引:16
作者
Parreira, C
Enachescu, C
Linarès, J
Boukheddaden, K
Varret, F
机构
[1] Univ Versailles, CNRS UMR 8634, Lab Magnet & Opt, F-78035 Versailles, France
[2] Univ Cergy Pointoise, Cergy Pontoise, France
[3] Alexandru Ioan Cuza Univ, Fac Phys, Iasi 6600, Romania
关键词
D O I
10.1088/0953-8984/12/45/303
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
The recently developed macroscopic model of light-induced equilibrium of spin-crossover solids is extended to the case of two equivalent sublattices coupled 'antiferromagnetically' To do this, we use an Ising-like model involving two coupling parameters of opposite signs for the intra- and inter-sublattice interactions, previously introduced to describe the two-step static spin transition, and we have adapted the macroscopic master equation describing the time evolution of the system accordingly. We mostly report on the quasi-static solutions of the system, under constant light irradiation and for slow temperature variations. Light-induced thermal hysteresis loops are obtained and have typical two-step shapes for suitable sets of parameter values. The model predicts, in analogy with the static transition, a possible light-induced symmetry breaking between the structurally equivalent sublattices. Kinetic effects are briefly described.
引用
收藏
页码:9395 / 9406
页数:12
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