Resonance Raman investigations of the symmetric stretching mode of I3− anions 
in α and β phases of di-bis(ethylenedithio)tetrathiafulvalene tri-iodide

Świetlik, R.; Schweitzer, D.; Keller, H. J.

doi:10.1103/PhysRevB.36.6881

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Resonance Raman investigations of the symmetric stretching mode of I3− anions in α and β phases of di-bis(ethylenedithio)tetrathiafulvalene tri-iodide

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Świetlik, R.
Department of Molecular Physics, Max Planck Institute for Medical Research, Max Planck Society;

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Schweitzer, D.
Department of Molecular Physics, Max Planck Institute for Medical Research, Max Planck Society;

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https://doi.org/10.1103/PhysRevB.36.6881
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https://journals.aps.org/prb/pdf/10.1103/PhysRevB.36.6881
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Zitation

Świetlik, R., Schweitzer, D., & Keller, H. J. (1987). Resonance Raman investigations of the symmetric stretching mode of I3− anions in α and β phases of di-bis(ethylenedithio)tetrathiafulvalene tri-iodide. Physical Review B, 36(13), 6881-6888. doi:10.1103/PhysRevB.36.6881.

Zitierlink: https://hdl.handle.net/21.11116/0000-0008-7634-9

Zusammenfassung

The resonance Raman spectra of I3− anions in the organic superconductor β-(BEDT-TTF)2I3 [BEDT-TTF represents bis(ethylenedithio)tetrathiafulvalene] were studied and discussed in comparison with the nonsuperconducting phase of α-(BEDT-TTF)2I3. In both modifications at low temperature a splitting of the Raman mode assigned to the symmetric stretching mode of the I3− anions was discovered. The splitting of this mode in the β-(BEDT-TTF)2I3 crystals is related to the commensurate superstructure developed below 125 K in contradiction to the α phase where the splitting is related to a crystal-field effect. It is shown that an electronic excitation of the β-phase crystals by laser light can induce a structural transformation at least in a thin layer of the surface. This transformation is observed by a disappearance of the splitting of the symmetric stretching mode. The structural change can be related to a transformation from the commensurate superstructure with a superconducting transition temperature Tc=1.3 K into a more ordered and symmetric structure which becomes superconducting at Tc=8.1 K.