TITLE

Effect of deuteration on the electronic and electron�vibrational properties of the organic conductor k-(D[sub 8]-BEDT�TTF)[sub 2][Hg(SCN)[sub 2]Br]

AUTHOR(S)

Vlasova, R. M.; Drozdova, O. O.; Semkin, V. N.; Lyubovskaya, R. N.

PUB. DATE

September 1998

SOURCE

Physics of the Solid State;Sep98, Vol. 40 Issue 9, p1447

SOURCE TYPE

Academic Journal

DOC. TYPE

Article

ABSTRACT

We present here for the first time polarized reflection spectra and optical conductivity spectra of single crystals of the newly deuterated organic conductor k-(D[sub 8]-BEDT�TTF)[sub 2][Hg(SCN)[sub 2]Br] at room temperature. The spectral region investigated is 700-40 000 cm[sup -1]. We examined the effect of deuteration on electronic and electron�vibrational transitions observed in the spectra. The observed shift of the electron �dimer� transition in the infrared toward lower frequencies upon deuteration is linked with an increase in the interaction between neighboring, mutually perpendicular dimers in the structure of the deuterated crystal. A lowering of the symmetry of the BEDT�TTF molecule is demonstrated in crystals similar to k-(BEDT�TTF)[sub 2][Hg(SCN)[sub 2]Br], relative to the symmetry D[sub 2h] of the free molecule. We refine the assignment of the spectral features determined by the interaction of electrons with the fully-symmetric intramolecular vibrations of the C=C, C�S, and C�C�H bonds of the BEDT�TTF molecule. � 1998 American Institute of Physics.

ACCESSION #

7324200

Tags: ORGANIC conductors;  REFLECTANCE spectroscopy

 

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