Novel dynamics of photo-induced phase transitions in systems with elastic long-range interactions

在自旋交叉（SC）配合物中观察到光照射、温度变化、压力变化等引起的场致相变。为了理解这种现象，研究晶格畸变引起的弹性相互作用的性质是很重要的。我们澄清了由于弹性相互作用的有效长程性质，这种体系的成核机制可以与传统的成核理论完全不同。此外，我们还证明了低自旋、高自旋和中相之间的临界现象具有不同的性质（普遍性）。我们还证明了低自旋相和高自旋相之间的界面动力学本质上取决于系统中自旋动力学和晶格动力学之间的关系。

Field-induced phase transitions by light irradiation, temperature change, pressure change, etc. are observed in spin-crossover (SC) complexes, etc. For understanding such phenomena, it is important to study the properties of elastic interactions caused by lattice distortion. We clarified that the nucleation mechanism for such systems can be totally different from that of the conventional nucleation theory due to the effective long-range nature of the elastic interaction. Furthermore, we showed that the critical phenomena between the low spin, high spin, and middle phases have different natures (universalities). We also demonstrated that the nature of the interface dynamics between the low and high spin phases essentially depends on the relation between dynamics of spin and that of lattice in the system.