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The Fermi surface topology of the organic superconductor \lbets has beendetermined using the Shubnikov-de Haas and magnetic breakdown effects andangle-dependent magnetoresistance oscillations. The former experiments werecarried out in pulsed fields of up to 60 T, whereas the latter employedquasistatic fields of up to 30 T. All of these data show that the Fermi-surfacetopology of \lbets is very similar to that of the most heavily-studied organicsuperconductor, \cuscn, except in one important respect; the interplanetransfer integral in \lbets is a factor $\sim 10$ larger than that in \cuscn .The increased three-dimensionality of \lbets is manifested in radiofrequencypenetration-depth measurements, which show a clear dimensional crossover in thebehaviour of $H_{c2}(T)$. The radiofrequency measurements have also been usedto extract the Labusch parameter determining the fluxoid interactions as afunction of temperature, and to map the flux-lattice melting curve.Comment: 24 pages 10 figure

journal of physics. condensed matter

Superconducting properties and Fermi-surface topology of the quasi-two-dimensional organic superconductor λ-(BETS)<sub>2</sub>GaCl<sub>4</sub>(BETS≡bis(ethylene-dithio)tetraselenafulvalene)

Superconducting properties and Fermi-surface topology of the quasi-two-dimensional organic superconductor λ-(BETS)2GaCl4(BETS≡bis(ethylene-dithio)tetraselenafulvalene)

Superconducting properties and Fermi-surface topology of the quasi-two-dimensional organic superconductor λ-(BETS)₂GaCl₄(BETS≡bis(ethylene-dithio)tetraselenafulvalene)