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Magnetic penetration depth of kappa -(BEDT-TTF)2Cu(NCS)2: Strong evidence for conventional Cooper pairing.

We report on dc magnetization measurements of high-quality single crystals of the title organic superconductor. The temperature dependence of the magnetic penetration depth is estimated from the slope of the linear M(lnH) dependence in the London regime. An excellent agreement with the BCS theory for a weak-coupling superconductor in the clean limit is found. An attempt is made to relate the mixed-state-derived penetration depth, λ(T→0)=535±20 nm, to normal-state Fermi-surface parameters. The strongly correlated heavy carriers appear to be of crucial importance to explain superconductivity in this material