Comparison of the normal-state properties of κ-(BEDT-TTF)2Cu(NCS)2 and its deuterated analogue in high magnetic fields and under high hydrostatic pressures

Tim Biggs, Anne Katrin Klehe, John Singleton, David Bakker, Jane Symington, Paul Goddard, Arzhang Ardavan, William Hayes, John A. Schlueter, Takehiko Sasaki, Mohamedally Kurmoo

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27 Citations (Scopus)


Details of the Fermi-surface topology of deuterated κ(BEDT-TFF)2Cu(NCS)2 (where BEDT-TTF ≡ bis(ethylene-dithio)tetrathiafulvalene) have been measured as a function of pressure, and compared with equivalent measurements of the undeuterated salt. We find that the superconducting transition temperature is much more dramatically suppressed by increasing pressure in the deuterated salt. It is suggested that this is linked to pressure-induced changes in the Fermi-surface topology, which occur more rapidly in the deuterated salt than in the undeuterated salt as the pressure is raised. Our data suggest that the negative isotope effect observed on deuteration is due to small differences in Fermi-surface topology caused by the isotopic substitution.

Original languageEnglish
Pages (from-to)L495-L502
JournalJournal of Physics Condensed Matter
Issue number26
Publication statusPublished - 2002 Jul 8

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics


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