Abstract
We studied the spin-state dependence of the electrical conductivity of two nanocrystalline powder samples of the spin crossover complex [Fe(pyrazine){Au(CN)2}2]. By applying an external pressure (up to 3 kbar), we were able to tune the charge transport properties of the material from a more conductive low spin state to a crossover point toward a more conductive high spin state. We rationalize these results by taking into account the spin-state dependence of the activation parameters of the conductivity.
Highlights
The spin crossover (SCO) phenomenon is observed in a large number of transition metal complexes with a 3d4–3d7 electron configuration [1]
By extrapolating the temperature dependence of the electrical conductivity σ of [Fe(Htrz)2(trz)](BF4) in both spin states, we have shown that the two σ(T) curves are crossing at high temperatures, and we suggested that this crossing point might be reached under an applied external pressure [2]
We show that it is possible to tune the electrical conductivity of the material, going from a substantially more conductive LS state to a crossover point denoting the onset of a more conductive HS state at high pressures
Summary
The spin crossover (SCO) phenomenon is observed in a large number of transition metal complexes with a 3d4–3d7 electron configuration [1]. By extrapolating the temperature dependence of the electrical conductivity σ of [Fe(Htrz)2(trz)](BF4) in both spin states, we have shown that the two σ(T) curves are crossing at high temperatures, and we suggested that this crossing point might be reached under an applied external pressure [2].
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