6533b828fe1ef96bd1289135
RESEARCH PRODUCT
Charge Mobility and Dynamics in Spin-Crossover Nanoparticles Studied by Time-Resolved Microwave Conductivity
Wiel H. EversMónica Giménez-marquésJulien DugayJulien DugayEugenio CoronadoRamón Torres-cavanillasHerre S. J. Van Der Zantsubject
Length scaleMaterials scienceCondensed Matter - Mesoscale and Nanoscale PhysicsPhononTransition temperatureFOS: Physical sciencesThermal fluctuations02 engineering and technologyActivation energyLiquid nitrogen010402 general chemistry021001 nanoscience & nanotechnology01 natural sciences0104 chemical sciencesSpin crossoverChemical physicsMesoscale and Nanoscale Physics (cond-mat.mes-hall)General Materials ScienceCharge carrierPhysical and Theoretical Chemistry0210 nano-technologydescription
We use the electrode-less time-resolved microwave conductivity (TRMC) technique to characterize spin-crossover (SCO) nanoparticles. We show that TRMC is a simple and accurate mean for simultaneously as-sessing the magnetic state of SCO compounds and charge transport information on the nanometre length scale. In the low-spin state from liquid nitrogen temperature up to 360 K the TRMC measurements present two well-defined regimes in the mobility and in the half-life times, possessing similar transition tempera-tures TR near 225 K. Below TR, an activation-less regime associated with short lifetimes of the charge carri-ers points at the presence of shallow-trap states. Above TR, these states are thermally released yielding a thermally activated hopping regime where longer hops increases the mobility and, concomitantly, the barrier energy. The activation energy could originate from intricate contributions such as polaronic self-localizations, but also from dynamic disorder due to phonons and/or thermal fluctuations of SCO moieties.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-03-02 | The Journal of Physical Chemistry Letters |