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

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Ludwig T., Schweitzer D., Keller H. J.

Acta Physica Polonica A

1995

vol. 87

issue 4-5

801-806

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.

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1 Acta Physica Polonica A

1 1995

1 Keller H. J.

1 Ludwig T.

1 Schweitzer D.

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