| Intrinsic effects of the boundary condition on the switching process of spin crossover solids (2009) | |||||||||
Abstract | |||||||||
| We investigated clustering dynamics of domains in switching processes between the low spin (LS) and high spin (HS) phases in thermal induced hysteresis loops of spin-crossover (SC) solids. In SC systems, the difference of molecular sizes between HS and LS states induces distortions of the lattice, and these distortions lead to elastic interaction, which causes an effective long range interaction among molecules. We found that the boundary condition plays an important role in clustering dynamics of domains. In the open boundary condition (OBC), a domain structure appears, which is different from the periodic boundary condition where uniform configurations are maintained during the switching process between the LS and HS phases. Domains in OBC always grow from corners, in contrast to the cases of short-range interacting models such as Ising-like models. In systems with long range interaction, the boundary condition would have a serious effect and it may be significant in nano-size systems. The present clustering mechanism would give an insight into the understanding of switching dynamics of SC solids including nano-size systems.. Comment: 5pages, 5figures | |||||||||
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