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Area of Science:

  • Molecular magnetism
  • Quantum phenomena in materials
  • Nanoscale electronic devices

Background:

  • Spin-crossover (SCO) molecules function as molecular switches, vital for molecular electronics and spintronics.
  • Current SCO mechanisms rely on intermolecular interactions, posing challenges for single-molecule device scaling.

Purpose of the Study:

  • Investigate electron transport through individual Fe-SCO molecules.
  • Understand the SCO switching mechanism at the single-molecule level.
  • Explore SCO molecule coupling to graphene electrodes.

Main Methods:

  • Fabrication of single Fe-SCO molecule junctions with few-layer graphene electrodes.
  • Measurement of electron transport and conductance bistability.
  • Density Functional Theory (DFT) calculations for orbital analysis.

Main Results:

  • Observed distinct conductance bistability in individual Fe-SCO molecules.
  • Associated bistability with SCO-induced molecular orbital reconfiguration.
  • Determined long spin-state lifetimes due to unique coordination and lack of intermolecular interactions.

Conclusions:

  • Single Fe-SCO molecules exhibit bistable conductance, independent of temperature.
  • SCO switching is triggered by molecular perturbations, not temperature, at the single-molecule level.
  • Demonstrated potential for SCO molecules in single-molecule electronic devices.