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Communication dans un congrès

Low temperature Raman scattering of κ-​(ET)​2X superconductors

Abstract : Single crystals of organic superconductors have been studied with micro-​Raman scattering above and below Tc. The two phases investigated are κ-​(ET)​2Cu(NCS)​2 (where ET = BEDT-​TTF bis-​ethylenedithiotetrathiafulvalene, Tc= 10.4K) and κ-​(ET)​2Cu[N(CN)​2]​Br (Tc= 11.6K)​. The Raman lineshapes have been calculated from the experimental spectra with a Green's function model involving a coupling between the phonons and a common continuum of electronic excitations. Renormalized frequencies, electron-​phonon coupling constants, dampings, scattering amplitude ratios of the continuum and the phonons are derived. Satisfactory reproduction of the low frequency spectrum is achieved and shows that low-​energy electronic excitations may be present in these systems. It is found that some low frequency phonons characteristic of intermolecular coupling harden slightly below Tc (1 to 2 cm-​1) whereas the high frequency C=C vibrations are not significantly changed with the temperature. This possibly indicates a correlation between low-​energy phonons and the superconducting mechanism.
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https://hal.univ-angers.fr/hal-02546955
Contributeur : Cécile Meziere <>
Soumis le : dimanche 19 avril 2020 - 11:34:19
Dernière modification le : lundi 20 avril 2020 - 01:35:41

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  • HAL Id : hal-02546955, version 1

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E. Faulques, C. Plouvier, S. Lefrant, P. Batail, V.G. Ivanov. Low temperature Raman scattering of κ-​(ET)​2X superconductors. 215th ACS National Meeting, ACS, Mar 1998, DALLAS, United States. pp.I&EC-115. ⟨hal-02546955⟩

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