Spatiotemporal Investigations on Light-Driven High-Spin–Low-Spin Interface Dynamics in the Thermal Hysteresis Region of a Spin-Crossover Single Crystal

• DOI: 10.1021/acs.jpcc.8b05704
• Publication Date: 2018-07-30T19:44:00Z
• Authors: Mouhamadou Sy; Rachid Traiche; Houcem Fourati; Yogendra Singh; François Varret; Kamel Boukheddaden
• Keywords: Spin Crossover; Hysteresis; Spin transition; Crystal (programming language); Spin diffusion; Spin states; Thermal hysteresis

We have investigated by optical microscopy the thermal spin transition of a single crystal spin-crossover compound [{Fe(NCSe)(py)2}2(m-bpypz)] under various shining intensities, far from light-induced spin-state trapping region. found evidence photoheating on thermally induced hysteretic response crystal, leading to control temperature and hysteresis width as function light intensity. The inspections spatiotemporal behaviors transition, heating cooling, also evidenced significant dependence propagation speed high-spin–low-spin interface intensity light. In particular, for strong slowing at is obtained, an unprecedented dynamical two-step-like was observed in hysteresis. These results are analyzed theoretically using approach based reaction–diffusion equations including heat transfer between bath. obtained good agreement with experimental observations lead identification key factors governing velocity excitation materials.