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Broad-Band Dielectric Spectroscopy Reveals Peak Values of Conductivity and Permittivity Switching upon Spin Crossover

Soroceanu, Ion and Graur, Adrian and Coca, Eugen and Salmon, Lionel and Molnár, Gábor and Demont, Philippe and Bousseksou, Azzedine and Rotaru, Aurelian Broad-Band Dielectric Spectroscopy Reveals Peak Values of Conductivity and Permittivity Switching upon Spin Crossover. (2019) The Journal of Physical Chemistry Letters. 7391-7396. ISSN 1948-7185

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Official URL: https://doi.org/10.1021/acs.jpclett.9b02678

Abstract

We use broad-band dielectric spectroscopy to investigate the spin-state dependence of electrical properties of the [Fe(Htrz)2(trz)](BF4) spin crossover complex. We show that the Havriliak–Negami theory can fully describe the variation of the complex dielectric permittivity of the material across the pressure–temperature phase diagram. The analysis reveals three dielectric relaxation processes, which we attribute to electrode/interface polarization, dipole relaxation, and charge transport relaxation. The contribution of the latter appears significant to the dielectric strength. Remarkably, the permittivity and conductivity changes between the high spin and low spin states are amplified at the corresponding relaxation frequencies.

Item Type:Article
HAL Id:hal-02378686
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Universitatea Stefan cel Mare Suceava - USU (ROMANIA)
Laboratory name:
Funders:
European Commission
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Deposited By: cirimat webmestre
Deposited On:25 Nov 2019 11:26

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