Comparison of the normal state properties of $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$ and its deuterated analogue in high magnetic fields and under high hydrostatic pressures

Abstract

Details of the Fermi-surface topology of deuterated $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$ ~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.

10 pages 3 figures

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Cited by in corpus (7)

• An Experimental and Semi-Empirical Method to Determine the Pauli-Limiting Field in Quasi 2D Superconductors as applied to $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$: Strong Evidence of a FFLO State
• Angle-dependent magnetoresistance oscillations due to magnetic breakdown orbits
• Anomalous behaviour of the in-plane electrical conductivity of the layered superconductor $\kappa$-(BEDT-TTF)${}_2$Cu(NCS)${}_2$
• Fermi surface properties of the bifunctional organic metal $\kappa$-(BETS)${}_2$Mn[N(CN)${}_2$]${}_3$ near the metal--insulator transition
• Interplay between the glassy transition and granular superconductivity in organic materials
• Comparison of the Fermi-surface topologies of kappa-(BEDT-TTF)_2 Cu(NCS)_2 and its deuterated analogue
• Comparative magnetotransport and Tc measurements on kappa-(BEDT-TTF)2Cu(SCN)2 under pressure