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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

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.

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Alternativer Titel : Resonance Raman investigations of the symmetric stretching mode of I3− anions in alpha and beta phases of di-bis(ethylenedithio)tetrathiafulvalene tri-iodide
Alternativer Titel : Resonance Raman investigations of the symmetric stretching mode of I3− anions in α and β-(BEDT-TTF)2I3
Alternativer Titel : Resonance Raman investigations of the symmetric stretching mode of I3− anions in alpha and beta-(BEDT-TTF)2I3

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PhysRevB_36_1987_6881.pdf (beliebiger Volltext), 353KB
 
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https://doi.org/10.1103/PhysRevB.36.6881 (beliebiger Volltext)
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https://journals.aps.org/prb/pdf/10.1103/PhysRevB.36.6881 (beliebiger Volltext)
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 Urheber:
Świetlik, R.1, Autor           
Schweitzer, D.1, Autor           
Keller, H. J., Autor
Affiliations:
1Department of Molecular Physics, Max Planck Institute for Medical Research, Max Planck Society, ou_1497705              

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 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.

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Sprache(n): eng - English
 Datum: 1987-11-01
 Publikationsstatus: Erschienen
 Seiten: 8
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1103/PhysRevB.36.6881
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Titel: Physical Review B
  Kurztitel : Phys. Rev. B
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Woodbury, NY : American Physical Society
Seiten: - Band / Heft: 36 (13) Artikelnummer: - Start- / Endseite: 6881 - 6888 Identifikator: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008