Piezoresistive Effect in the [Fe(Htrz)2(trz)](BF4) Spin Crossover Complex

Abstract : We report on the effect of hydrostatic pressure on the electrical conductivity and dielectric permittivity of the [Fe(Htrz)2(trz)](BF4) (Htrz = 1H-1,2,4,- triazole) spin crossover complex. Variable-temperature and -pressure broad-band impedance spectrometry revealed a piezoresistive effect of more than 1 order of magnitude for pressures as low as 500 bar, associated with a large pressure-induced hysteresis of 1700 bar. The origin of the piezoresistive effect has been attributed to the pressure-induced spin state switching in the complex, and the associated P,T phase diagram was determined.
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Andrei Diaconu, Simona-Lacramioara Lupu, Ionela Rusu, Ioan-Marian Risca, Lionel Salmon, et al.. Piezoresistive Effect in the [Fe(Htrz)2(trz)](BF4) Spin Crossover Complex. Journal of Physical Chemistry Letters, American Chemical Society, 2017, 8 (13), pp.3147-3151. ⟨10.1021/acs.jpclett.7b01111⟩. ⟨hal-01556504⟩

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