Stimuli-Responsive Low-Frequency Terahertz Absorption ON-OFF Switchability in Spin-Crossover Material.

ABSTRACT: Thermal and optical-induced ON-OFF switchable materials show vast potential in various fields like sensors, spintronics, and electronic devices, but remain underexplored in the essential terahertz (THz) region. In this context, a unique 1D spin-crossover (SCO) network, {[Fe^II(4-cyanopyridine)₂][Hg^II(µ-SCN)₂(SCN)(4-cyanopyridine)]₂}_n (1), has been designed. Temperature-dependent crystallographic, magnetic, and THz absorption spectroscopic studies indicate an abrupt SCO phenomenon from a high-spin (HS) state to a complete or partial low-spin (LS) state, depending on the cooling rate. At low temperatures, the LS state can be converted into the metastable HS state via the light-induced excited spin-state trapping (LIESST) effect

SUBMITTER: Li G 

PROVIDER: S-EPMC12464634 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature