Numéro |
J. Phys. I France
Volume 4, Numéro 10, October 1994
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|
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Page(s) | 1461 - 1467 | |
DOI | https://doi.org/10.1051/jp1:1994200 |
J. Phys. I France 4 (1994) 1461-1467
Optical properties of organic conductor (ET) 4Hg 3I 8 : alternative type of electron-vibrational interaction
M. G. Kaplunov, R. N. Lyubovskaya and R. B. LyubovskiiInstitute of Chemical Physics in Chernogolovka, Russian Academy of Sciences, Chernogolovka, 142432, Russia
(Received 6 December 1993, revised 1 June 1994, accepted 7 July 1994)
Abstract
The reflectivity spectra of single crystals of (ET)
4Hg
3I
8 and
(d
8-ET)
4Hg
3I
8 were studied. In contrant with earlier studied clorine- and
brominemercurate compounds of the series (ET)
4Hg
- X
8 (X = Cl, Br, I),
the spectra of iodinemercurate compounds exhibit low reflectivity without well-defined plasma
edge and without electron-vibrational bands in the region 1 000 - 1 400 cm
-1. The latter
fact may be due to electron-vibrational interaction with non-totally symmetric modes which
may originate from peculiarities of crystal structure of iodinemercurate compounds. A phase
transition of the first type is observed both for (ET)
4Hg
3I
8 and
(d
8-ET)
4Hg
3I
8. At the transition temperature a jump in conductivity and
reflectivity is observed.
© Les Editions de Physique 1994