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

“…Instead, our data support models for exotic d-wave superconductivity in the organics which invoke electron-electron interactions depending on the topological (i.e. nesting) properties of the Fermi surface [3][4][5][6]. Similar interactions probably contribute to the relatively large values of the quasiparticle mass observed in κ-(BEDT-TTF) 2 Cu(NCS) 2 [1].…”

“…Taken in conjunction with very recent millimetre-wave magnetoconductivity experiments [26], our data suggest that it is primarily the changes in the detailed topology of the of the Fermi surface brought about by deuteration that cause the observed isotope effect. This would tend to support models for superconductivity involving pairing via electron-electron interactions [3][4][5][6][7].…”