Geometrical isotope effect induced by deuteration of κ-(BEDT-TTF)2X (X=CuN(CN)2Br and Cu(NCS)2)

Y. Watanabe, T. Shimazu, T. Sasaki, N. Toyota

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14 Citations (Scopus)


We report thermal expansion measurements by four-circle X-ray diffraction (300K-12K) on the title superconductors based on hydrogenated and deuterated BEDT-TTF's. The fractional changes in lattice parameters induced by deuteration are at the lowest temperatures just above Tc: +0.11% and +0.03% for c- and a-axis for CuN(CN)2Br salts, and -0.1% for c-axis of Cu(NCS)2 salt, while other parameters remain unchanged within an experimental error. These significant changes are considered to be caused by a geometrical isotope effect for both the ethylene group and the hydrogen bonding to anionic ligands.

Original languageEnglish
Pages (from-to)1917-1918
Number of pages2
JournalSynthetic Metals
Issue number1-3
Publication statusPublished - 1997 Feb 28


  • Diffraction and scattering
  • Organic superconductors
  • X-ray emission


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