A Raman study of the organic superconductor κ-(BEDT-TTF)2Cu(SCN)2 at high pressure

R. D. McDonald, A. K. Klehe, A. P. Jephcoat, H. Olijnyk, T. Sasaki, W. Hayes, J. Singleton

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Abstract

The Raman spectrum of the organic superconductor κ-(BEDT-TTF)2Cu(SCN)2 has been measured under hydrostatic pressures up to 1.5 GPa at room temperature. Linear variation of all the observed modes with pressure confirms the absence of a structural phase transition in this pressure range. The Raman spectra reveal three low-frequency features that rapidly stiffen with pressure, d ln v/dP = 5-17% GPa-1; comparison with x-ray data indicates assignment to lattice modes. By contrast, most Raman-active intramolecular vibrations stiffen by only 0.1-1% GPa-1. Contrary to expectations from a previous high-pressure x-ray study, we do not observe a pressure induced splitting of the 3Ag mode.

Original languageEnglish
Pages (from-to)L291-L298
JournalJournal of Physics Condensed Matter
Volume13
Issue number15
DOIs
Publication statusPublished - Apr 16 2001

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

McDonald, R. D., Klehe, A. K., Jephcoat, A. P., Olijnyk, H., Sasaki, T., Hayes, W., & Singleton, J. (2001). A Raman study of the organic superconductor κ-(BEDT-TTF)2Cu(SCN)2 at high pressure. Journal of Physics Condensed Matter, 13(15), L291-L298. https://doi.org/10.1088/0953-8984/13/15/101