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DS: Fachverband Dünne Schichten
DS 14: Poster
DS 14.7: Poster
Tuesday, April 2, 2019, 17:00–20:00, Poster E
Thin film investigations on the ferroelectric organic charge transfer salt TTF-Chloranil — •Lukas Keller and Michael Huth — Institute of Physics, Goethe University, Max-von-Laue-Str. 1, 60438 Frankfurt am Main, Germany
Tetrathiafulvalene-chloranil (TTF-CA) is an organic ferroelectric below TC = 81 K [1] whose bulk properties have been studied in some detail [2]. However, very limited research has been done on thin films despite the strong dependence of the paraelectric to ferroelectric phase transition on strain which can most easily be tailored in thin film structures [3]. Moreover, the ferroelectric phase coexists with a dimerized spin chain for which it is so far unclear whether it shows long-range order.
Here we present recent results of the electrical and dielectric properties of TTF-CA thin films grown by molecular beam deposition. In particular we focus on the influence of the ferroelectric state of the layers on nearby metallic electrodes by way of surface scattering modifications. Furthermore, we present results on the the dielectric screening effect caused by the TTF-CA layer on the charge transport in a nano-granular metal layer in close proximity.
[1]: Torrance et al., Phys. Rev. Lett. 47, 24 (1981). [2]: Horiuchi et al., Chem. Lett. 43, 26 (2014). [3]: Huth et al., Mater. Res. Express 1, 046303 (2014)