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Phonon self-energy effects in κ − ( BEDT − TTF ) 2 Cu [ N ( CN ) 2 ] Br

Abstract : We report on the observation of phonon self-energy effects in the vicinity of Tc in the organic superconductor κ−(BEDT−TTF)2Cu[N(CN)2]Br, and their interpretation in the framework of strong electron-phonon coupling. The data qualify anomalous temperature dependence of the low-frequency phonons around and below Tc, and are consistent with an isotropic gap 2Δ0 close to 2.8 meV. Significant frequency shifts are recorded which allow us to evaluate the electron-phonon coupling λ for energetically weak phonons. The subsequent calculated values agree well with a superconducting transition at Tc∼11.6 K.
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Soumis le : vendredi 17 avril 2020 - 15:07:54
Dernière modification le : mardi 27 septembre 2022 - 04:37:36



E. Faulques, V. Ivanov, C. Mézière, P. Batail. Phonon self-energy effects in κ − ( BEDT − TTF ) 2 Cu [ N ( CN ) 2 ] Br. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2000, 62 (14), pp.R9291-R9294. ⟨10.1103/PhysRevB.62.R9291⟩. ⟨hal-02545914⟩



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