Raman-Studies of the Organic Superconductor β-(BEDT-TTF)₂IAuI

Abstract

The resonance Raman spectra of (IAuI)--anions in the organic superconductor β-(BEDTTTF)2IAuI as well as in the electrolyte salt n-Bu4AuI2 are investigated. In contrast to β-(BEDT-TTF)2I3 in the crystals of β-BEDT-TTF)2IAuI at low temperature only one Raman line at 120 cm-1 corresponding to the symmetrical stretching mode of the (IAuI)--anion is observed. No distinct change in the Raman spectra is observed at the superconducting transition.

Resonance Raman and infrared studies of the organic superconductor k‐(MDT‐TTF)2AuI2 in the normal state

“…In this context, it is worth mentioning that similar bands have been observed in the Raman spectra of P-(BEDT-TTF),AuI, and were attributed to the symmetric stretching vibration of linear A d , -anions. 21 In the present case the symmetric stretching of Au1,-is observed as a medium-intensity band at 153 em-', in agreement with previous Raman studies of ~-Bu,NALII, . 22 Therefore, the strong Au--1 interaction between adjacent Aul, species in the polymeric polyanion previously proposedz3 appears to have no significant influence on the force constant of the Au-I bond.…”

Raman spectra of the tetrabutylammonium diiodoaurate(I) crystal, TBA‐AuI2, without I3− impurity bands

“…1 is less affected by impurities than that reported in Ref. 5. Figure 2 shows the low-temperature polarized Raman spectra of a single crystal of TBA-AuI, obtained by recrystallizing twice from ethyl acetate.…”

Spin Vortex Crystal Order in Organic Triangular Lattice Compound

“…As a result, we neglect electronic contributions in our background modelling. For organic charge-transfer salts it has often been reported that the low-temperature specific heat is dominated by Debye and Einstein contributions, resulting from acoustical and low-lying optical phonons [73]. In order to keep the number of fitting parameters small, we considered only one Einstein and one Debye temperature.…”