A Moreac et al 1996 J. Phys.: Condens. Matter 8 3553 doi:10.1088/0953-8984/8/20/004
The neutral-to-ionic phase transition of TTF-CA: a Raman and infrared study versus temperature at atmospheric pressure
A Moreac, A Girard, Y Delugeard and Y Marqueton
Show affiliationsThe very first low-frequency infrared absorption and Raman scattering spectra of TTF-CA are presented. Several studies have been performed as a function of temperature at atmospheric pressure. In the neutral phase by infrared absorption, we have emphasized the critical behaviour of an antisymmetric lattice mode (located around 
at 150 K) which shows the displacive nature of the neutral-to-ionic phase transition of TTF-CA at atmospheric pressure. In the ionic phase, the Raman scattering study has permitted confirmation of this result, the soft mode being located around 
at 16 K. Besides, the Raman study of several totally symmetric internal modes has confirmed the clearly first-order character of this transition. Finally, this study permits an estimation of the e - mv (electron-molecular vibrations) coupling constants in the neutral and ionic phases.
- PACS
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78.30.Jw Organic compounds, polymers
63.70.+h Statistical mechanics of lattice vibrations and displacive phase transitions
- Subjects
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Soft matter, liquids and polymers
- Dates
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Issue 20 (13 May 1996)
Received 2 January 1996
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The neutral-to-ionic phase transition of TTF-CA: a Raman and infrared study versus temperature at atmospheric pressure
A Moreac et al 1996 J. Phys.: Condens. Matter 8 3553
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