Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 40: Poster Session Correlated Electrons

TT 40.50: Poster

Mittwoch, 13. März 2013, 15:00–19:00, Poster D

Thin film growth and characterization of the neutral-ionic phase transition system tetrathiafulvalene-p-chloranil — •Achim Rippert, Milan Rudloff, Kai Ackermann, Lukas Keller, and Michael Huth — Physikalisches Institut, Goethe-Universität, Max-von-Laue-Str. 1, 60438 Frankfurt am Main

Tetrathiafulvalene-p-chloranil (TTF-QCl4) thin films have been prepared by physical vapor deposition of the pre-reacted source material on the substrate materials NaCl, SiO2 and Au. We studied the growth characteristics and electronic transport properties with a view to the influence of substrate-induced effects, such as clamping and strain, on the electronic properties of the layers. TTF-QCl4 is a mixed-stack organic charge transfer compound that shows a temperature-driven paraelectric-to-ferroelectric phase transition associated with a charge of the charge transfer degree at 81 K. This phase transition could be observed in our thin films during electronic transport measurements, as well as in frequency dependent capacity measurements. Furthermore, a color change of the materials could be noticed at the transition temperature. Our research aims for taking advantage of thin-film specific control mechanisms, such as induced biaxial strain and electrostatic field effects, and thus providing a new perspective on the neutral-ionic phase transition in the one-dimensional, mixed-stack organic charge transfer compounds.