The pressure dependence of electron-phonon coupling in the organic superconductor $κ$-(BEDT-TTF)$_{2}$Cu(SCN)$_{2}$: A comparison of high pressure infrared reflectivity and Raman scattering experiments

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dc.creatorMcDonald, R. D.
dc.creatorKlehe, A. -K.
dc.creatorSingleton, J.
dc.creatorHayes, W.
dc.date2001-05-16
dc.date2001-05-25
dc.date.accessioned2026-07-07T02:41:26Z
dc.date.available2026-07-07T02:41:26Z
dc.descriptionWe determine the pressure dependence of the electron-phonon coupling constant in $κ$-(BEDT-TTF)$_{2}$Cu(SCN)$_{2}$ by comparison of high pressure Raman scattering and high pressure infrared reflectivity (IR) measurements. We use comparison of the IR reflection spectrum from deuterated and protonated samples to aid the deconvolution of several overlapping phonon modes. These coupled modes are modelled with a Green's function to extract the linear pressure dependence of the individual modes. The Raman active molecular vibrations of the BEDT-TTF dimers stiffen by 0.1-1 %GPa$^{-1}$. In contrast, the corresponding modes in the IR spectrum are observed at lower frequency, with a pressure dependence of 0.5-5.5 %GPa$^{-1}$, due to the influence of the electron-phonon interaction. The stronger pressure dependence of the central C=C mode of the BEDT-TTF molecule in the IR, is discussed. Our analysis suggests that reduction of electron-phonon coupling under pressure does not account for observed suppression of superconductivity under pressure.
dc.description4 pages, 1 figure, revtex4 style, submitted to PRL V2: Typo corrected, thanks added
dc.identifierhttps://arxiv.org/abs/cond-mat/0105316
dc.identifierhttp://arxiv.org/abs/cond-mat/0105316
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/17742
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleThe pressure dependence of electron-phonon coupling in the organic superconductor $κ$-(BEDT-TTF)$_{2}$Cu(SCN)$_{2}$: A comparison of high pressure infrared reflectivity and Raman scattering experiments
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