Infrared studies of the organic superconductor κ-(BEDT-TTF)2Cu(SCN)2 under pressure

A. K. Klehe, R. D. McDonald, A. F. Goncharov, V. V. Struzhkin, Ho Kwang Mao, R. J. Hemley, T. Sasaki, W. Hayes, J. Singleton

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Abstract

The organic superconductor κ-(BEDT-TTF)2Cu(SCN)2 has been investigated at room temperature by polarized mid-infrared (600-7000 cm-1) reflectivity measurements at pressures of up to 1.7 GPa. The optical effective mass, mopt, decreases linearly with pressure, in contrast to the pressure dependence of the effective mass, m*, determined by magnetic quantum oscillation measurements (Caulfield J et al 1994 J. Phys.:Condens. Matter 6 2911-24; Caulfield J et al 1995 Synth. Met. 70 815-8). Most phonon modes are seen to exhibit a linear pressure dependence of 0.5-1%/GPa. The stronger pressure dependence of the central C=C mode of the BEDT-TTF molecule is discussed: it is thought to be due to the pressure dependence of the effective Coulomb repulsion in κ-(BEDT-TTF)2Cu(SCN)2. These measurements suggest that a change in the electron-electron interaction under pressure could be the relevant factor for the suppression of superconductivity under pressure in κ-(BEDT-TTF)2Cu(SCN)2.

Original languageEnglish
Pages (from-to)L247-L256
JournalJournal of Physics Condensed Matter
Volume12
Issue number13
DOIs
Publication statusPublished - 2000 Apr 3

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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    Klehe, A. K., McDonald, R. D., Goncharov, A. F., Struzhkin, V. V., Mao, H. K., Hemley, R. J., Sasaki, T., Hayes, W., & Singleton, J. (2000). Infrared studies of the organic superconductor κ-(BEDT-TTF)2Cu(SCN)2 under pressure. Journal of Physics Condensed Matter, 12(13), L247-L256. https://doi.org/10.1088/0953-8984/12/13/103