Resonance Raman Investigations of Low Energetic Modes in the Organic Superconductors α_{t}-(BEDT-TTF)_{2}I_{3} and β-(BEDT-TTF)_{2}IAuI

• Authors: T. Ludwig , D. Schweitzer , H.J. Keller
• Languages of publication: EN

Abstracts

EN

A study of low energetic modes in the resonance Raman spectra of the organic superconductors α_{t}-(BEDT-TTF)_{2}I_{3} (T_{c} = 8 K) and β-(BEDT-TTF)_{2}IAuI (T_{c} = 4 K) in the temperature range of 1.5-100 K was per­formed. In both materials, a strong vanishing of low energetic phonon bands (at 30 cm^{-1} and 40 cm^{-1} for α_{t}-(BEDT-TTF)_{2}I_{3} and at 27 cm^{-1} and 33 cm^{-1} for β-(BEDT-TTF)_{2}IAuI) below 71 was observed. For the sym­metric stretching mode of the I¯_{3} and the IAuI¯ anion at 120 cm^{-1} no change below T, was found. In addition, wavelength dependent measure­ments on α-(BEDT-TTF)_{2}I_{3} were performed, indicating that the modes around 30 cm^{-1} are probably librational modes of the BEDT-TTF molecules.

Keywords

EN

78.30.-j; 74.70.Kn

• Journal: Acta Physica Polonica A
• Year: 1995
• Volume: 87
• Issue: 4-5
• Pages: 801-806

Dates

published

1995-04

Contributors

author

T. Ludwig

• 3. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany

author

D. Schweitzer

• 3. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany

author

H.J. Keller

• Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany