Electric and Thermosalient Properties of a Charge-Transfer
Complex Exhibiting a Minor Valence Instability Transition
Posted on 2020-06-15 - 19:04
The
charge-transfer (CT) complex 3,3′,5,5′-tetramethylbendizine-7,7,8,8-tetracyanoquinodimethane
was found to display the thermosalient effect, in which crystals exhibit
mechanical responses due to temperature changes. Such responses are
rarely observed with CT complexes. Furthermore, while this crystalline
complex was known to have an interesting phase transition in which
the charge distribution changes at low temperatures, some of the physical
properties of single crystals of the material were unknown, because
the crystal is broken during the thermosalient event. In this study,
we used a polymer-coating method to prevent cracking of the crystal,
allowing us to observe drastic changes in resistivity and ferroelectric-like
dielectric response accompanied by the phase transition at low temperature.
This result suggests that organic solids with mechanical response
and electric and magnetic functions can be produced, since CT complexes
exhibit various electric and magnetic functions and physical properties.
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Takahashi, Yukihiro; Kondo, Tsubasa; Yokokura, Seiya; Takehisa, Mika; Harada, Jun; Inabe, Tamotsu; et al. (2020). Electric and Thermosalient Properties of a Charge-Transfer
Complex Exhibiting a Minor Valence Instability Transition. ACS Publications. Collection. https://doi.org/10.1021/acs.cgd.0c00516