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

Details 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 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

2001-05-16

arxiv.org/abs/cond-mat/0105316v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 1 figure, revtex4 style, submitted to PRL V2: Typo corrected, thanks added

Scientific paper

We determine the pressure dependence of the electron-phonon coupling constant in $\kappa$-(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.

Affiliated with

Also associated with

No associations

Rating

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 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with 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, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and 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 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-151258