Affes K, Slimani A, Singh Y, Maalej A, Boukheddaden K
Laboratoire des Matériaux Multifonctionnels et Applications, Université de Sfax, Faculté des Sciences de Sfax, Route de la Soukra km 3.5, 3000, Sfax, Tunisia. GEMaC, CNRS-Université de Versailles Saint Quentin en Yvelines, 45 Avenue des Etats Unis, F-78035 Versailles Cedex, France.
J Phys Condens Matter. 2020 Jun 10;32(25):255402. doi: 10.1088/1361-648X/ab7a4a.
Spin-crossover (SCO) solids have been studied for several years due to their fascinating physical properties and their potential applications as optical switches and reversible high-density memories for information storage. Through this article, we will examine in details the effects of substrate's lattice parameters, on a deformable spin crossover membrane, simulated using an electro-elastic model taking into account the volume change at the transition. The molecules of the membrane can be either in the low spin state (LS) or the high spin state (HS), while those of the substrate are electronically neutral. Magnetic properties of the SCO membrane and the pressure distribution as a function of the lattice parameter of the substrate have been investigated. We demonstrated that the thermally induced first-order spin transition is significantly affected by the structural properties of the substrate, where a rise in the lattice parameter of the latter lowers the transition temperature and reduces the width of the thermal hysteresis loop. The investigations on the spatiotemporal aspects of the spin transition in the membrane demonstrates that the nucleation and growth processes are sensitive to the structural properties of the elastic misfit between the substrate and the SCO membrane.
由于自旋交叉（SCO）固体具有迷人的物理性质以及作为光开关和用于信息存储的可逆高密度存储器的潜在应用，人们已经对其进行了数年的研究。在本文中，我们将详细研究衬底晶格参数对可变形自旋交叉膜的影响，该膜是使用考虑了转变时体积变化的电弹性模型模拟的。膜分子可以处于低自旋态（LS）或高自旋态（HS），而衬底分子是电中性的。研究了SCO膜的磁性以及作为衬底晶格参数函数的压力分布。我们证明，热诱导的一级自旋转变受到衬底结构性质的显著影响，其中衬底晶格参数的增加会降低转变温度并减小热滞回线的宽度。对膜中自旋转变的时空方面的研究表明，成核和生长过程对衬底与SCO膜之间弹性失配的结构性质敏感。
