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Comparison of the Fermi-surface topologies of kappa-(BEDT-TTF)₂ Cu(NCS)₂ and its deuterated analogue

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arxiv cond-mat/0208086 v1 pith:QPHFD3GM submitted 2002-08-05 cond-mat.str-el

Comparison of the Fermi-surface topologies of kappa-(BEDT-TTF)₂ Cu(NCS)₂ and its deuterated analogue

R.S. Edwards , A. Narduzzo , J. Singleton , A. Ardavan , J.A. Schlueter This is my paper
classification cond-mat.str-el
keywords deuteratedanaloguebedt-ttffermifermi-surfacekappa-angle-dependentcomparison
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We have measured details of the quasi one-dimensional Fermi-surface sections in the organic superconductor kappa-(BEDT-TTF)_2 Cu(NCS)_2 and its deuterated analogue using angle-dependent millimetre-wave techniques. There are significant differences in the corrugations of the Fermi surfaces in the deuterated and undeuterated salts. We suggest that this is important in understanding the inverse isotope effect, where the superconducting transition temperature rises on deuteration. The data support models for superconductivity which invoke electron-electron interactions depending on the topological properties of the Fermi surface.

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