Interplane corrugations in quasi-one-dimensional Fermi surface sections of deuterated and undeuterated κ-(BEDT-TTF)2Cu(NCS)2

Recently a small but definite isotope effect has been found on deuteration of the organic superconductor κ-(BEDT-TTF)2Cu(NCS)2 [Physica C 351 (2000) 251]. We have investigated the alterations in band-structure brought about by deuteration using a millimetre-wave technique which is sensitive to the corrugations of the quasi-one-dimensional (Q1D) sheets of the Fermi surface [J. Phys. 13 (2001) 2235]. We have mapped the interplane corrugations of the Q1D Fermi surface sections and discuss the dependence of the warping components of these Q1D sheets on the deuteration.