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Light- and Temperature-Assisted Spin State Annealing: Accessing the Hidden Multistability

submitted on 22.11.2019, 12:03 and posted on 29.11.2019, 17:47 by Yan-Cong Chen, Yan Meng, Jiří Tuček, Yan-Jie Dong, Xiao-Wei Song, Guo-Zhang Huang, Chuan-Lei Zhang, Zhao-Ping Ni, Radek Zbořil, Ming-Liang Tong
Among the responsive multistable materials, spin crossover (SCO) systems are of particular interest for stabilizing multiple spin states with various stimulus inputs and physical outputs. Here in a 2D Hofmann-type coordination polymer [Fe(isoq)2{Au(CN)2}2] (isoq = isoquinoline), hidden multistability of the spin state is accessed by introducing an medium-temperature annealing after a light/temperature stimulation. With the combined effort of magnetic, crystallographic and Mössbauer spectral investigation, these distinct spin states are identified and the light- and temperature-assisted transition pathways are clarified. Such excitation-relaxation and trapping-relaxation joint mechanisms, as ingenious interplays between the kinetic and thermodynamic effects, uncover hidden possibilities for the discovery of multistable materials and the development of multistate intelligent devices.


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Sun Yat-Sen University



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Declaration of Conflict of Interest

The authors declare no conflict of interest.

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