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Optical study of ß”-(bis(ethylenedithio)tetrathiafulvalene)2SF5CH2SO3 Activation of intramolecular modes

Olejniczak I., Barszcz B., Graja A., Schlueter J. A.

Materials Science Poland

2009

Vol. 27, No. 3

621--627

We report on the temperature dependences of polarized reflectance spectra of ß”-(bis(ethylenedithio) tetrathiafulvalene)2SF5CH2SO3. The material remains in the charge-ordered state over the whole temperature range. Room temperature infrared spectra display the response characteristic of a quasi-twodimensional organic conductor, with a broad mid-infrared electronic excitation and a number of vibrational features related to intramolecular modes of both the bis(ethylenedithio)tetrathiafulvalene (ET) donor molecule and the SF5CH2SO3 anion. Upon lowering the temperature, unusual activation of intramolecular modes of ET is observed. We suggest that this effect is connected with electronmolecular vibration coupling within a dimerized lattice.

Highly conducting organic composites obtained by charge transfer reaction in the solid state

Graja A., Golub M.

Materials Science Poland

2004

Vol. 22, No. 4

317--331

In this paper, we shortly present and discuss structural, electrical and spectral properties of organic composites with the general formulae (BEDT-TTF)x/A and (BEDO-TTF)x/A, where A denotes an electron- acceptor species such as iodine, AuI, or AuI3. Electron transfer between large conducting grains restricts electrical conductivity of the composites; the most probable mechanism being fluctuation -induced tunneling conduction. Extensive spectral properties of organic composites are presented. It is shown that spectral studies can provide specific information about charge localization, electron-electron and electron-molecular vibration interactions, and about changes in the properties of highly conducting organic composites with ageing or annealing.

Electron-electron correlations in (BEDT-TTF)2I3 organic superconductors

Balthes E., Nothardt A., Wyder P., Schweitzer D.

Materials Science Poland

2004

Vol. 22, No. 4

285--298

The detection of the fractional Landau level filling factor a?= 1/2 and low integer filling factors in the two-dimensional multilayer organic metal a-(BED-TTF)2I3 is presented, which shows the occurrence of electron localisation and electron-electron correlation in this bulk metallic two-dimensional system. These effects are found in the normal conducting state of the organic superconductor a-(BEDT-TTF)2I3. In addition, quantum oscillation measurements are found to be a very promising tool for direct detection of the chemical potential and its variation with magnetic field, even under rather complex fermiological conditions.