Electronic structure and electron-molecular vibrational coupling in organic superconductors ET4Hg2.89Br8 and ET2Cu(NCS)2: comparative studies by optical spectroscopy

Bandwidth-controlled Mott transition inκ−(BEDT−TTF)2Cu[N(C<

“…The model taking into account two perpendicular dimers of BEDT-TTF molecules successfully describes the midinfrared peak and emv-coupled features in the roomtemperature spectra of the κ-phase salts, 58,62 while it does not account for the metallic behavior; thus it is not able to mimic the appearance of a Drude-peak in the compounds with high Br content.…”

Incoherent interplane conductivity ofκ−(BEDT−TTF)2Cu[NMcGuire1, Rõõm2, Pronin3 et al. 2001Phys. Rev. B361241View full textAdd to dashboardCite

“…To date, however, infrared studies have focused on the in-plane properties, [15][16][17][18][19][20][21] and the few interplane measurements which have been made [22][23][24][25] were at room temperature and above 600 cm Ϫ1 . This is due to the difficulty of growing crystals with large faces perpendicular to the conducting planes.…”

Different Types of Electron-Vibrational Interaction in BEDT-TTF Salts with Halide-Mercurate Anions Studied by IR Spectroscopy

“…This kind of spectra contains a characteristic group of electron-vibrational bands with main maxima at about 1250 and 1350 cm -1 and also bands at about 850 and 400 cm-1 . These bands are attributed to electron-vibrational interaction involving totally symmetric intramolecular vibrational modes which is confirmed by theoretical analysis of IR spectra with the use of the "phase phonons" model [10][11][12].…”

“…Two types of IR reflectivity spectra may be considered from the given data. The typical representative of the type 1 may be the spectra of K-phase structure superconducting compounds (ET) 4Hg3-δX3 (X = Cl, Br) [10][11][12] (Fig. la).…”