Hao Guanhua, Dale Ashley S, N'Diaye Alpha T, Chopdekar Rajesh V, Koch Roland J, Jiang Xuanyuan, Mellinger Corbyn, Zhang Jian, Cheng Ruihua, Xu Xiaoshan, Dowben Peter A
Department of Physics and Astronomy, Jorgensen Hall, University of Nebraska, Lincoln, NE 68588, United States of America.
Advanced Light Source, Lawrence Berkeley National Lab, One Cyclotron Rd, Berkeley, CA 94720, United States of America.
J Phys Condens Matter. 2022 May 19;34(29). doi: 10.1088/1361-648X/ac6cbc.
Compact domain features have been observed in spin crossover [Fe{HB(pz)}(bipy)] molecular thin film systems via soft x-ray absorption spectroscopy and photoemission electron microscopy. The domains are in a mixed spin state that on average corresponds to roughly 2/3 the high spin occupation of the pure high spin state. Monte Carlo simulations support the presence of intermolecular interactions that can be described in terms of an Ising model in which interactions beyond nearest-neighbors cannot be neglected. This suggests the presence of short-range order to permit interactions between molecules beyond nearest neighbor that contribute to the formation of largely high spin state domains structure. The formation of a spin state domain structure appears to be the result of extensive cooperative effects.
通过软X射线吸收光谱和光发射电子显微镜，在自旋交叉[Fe{HB(pz)}(bipy)]分子薄膜系统中观察到了紧凑畴特征。这些畴处于混合自旋状态，平均而言，其高自旋占据率约为纯高自旋状态的2/3。蒙特卡罗模拟支持分子间相互作用的存在，这种相互作用可以用伊辛模型来描述，其中最近邻以外的相互作用不可忽略。这表明存在短程有序，以允许最近邻以外的分子之间发生相互作用，从而有助于形成主要为高自旋态的畴结构。自旋态畴结构的形成似乎是广泛协同效应的结果。
