Evolution of ferroelectricity in tetrathiafulvalene-p-chloranil as a function of pressure and temperature (CROSBI ID 216992)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Dengl, Armin ; Beyer, Rebecca ; Peterseim, Tobias ; Ivek, Tomislav ; Untereiner, Gabriele ; Dressel, Martin
engleski
Evolution of ferroelectricity in tetrathiafulvalene-p-chloranil as a function of pressure and temperature
The neutral-to-ionic phase transition in the mixed-stack charge-transfer complex tetrathiafulvalene-p-chloranil (TTF-CA) has been studied by pressure-dependent infrared spectroscopy up to p = 11 kbar and down to low temperatures, T = 10 K. By tracking the C=O antisymmetric stretching mode of CA molecules, we accurately determine the ionicity of TTF-CA in the pressure-temperature phase diagram. At any point, the TTF-CA crystal bears only a single ionicity ; there is no coexistence region or an exotic high-pressure phase. Our findings shed new light on the role of electron-phonon interaction in the neutral-ionic transition.
neutral-ionic transition ; organic insulator ; molecular vibrations ; vibrational spectroscopy ; infrared ; temperature ; pressure
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Podaci o izdanju
140 (24)
2014.
244511
6
objavljeno
0021-9606
1089-7690
10.1063/1.4884964