β′′-(ET)₂SF₅CH₂CF₂SO₃ – a Layered 2D Metal with Vanishing Interlayer Coupling

We report on electrical transport and magnetization measurements of the quasi-two-dimensional layered superconductor β′′-(ET)2SF5CH2CF2SO3. The absence of a resistive peak when a strong magnetic field is aligned along the conducting planes reflects the fact that the material is one of the most anisotropic ET-based metals with possible incoherent interlayer transport. Consequences of this feature may be the enhanced amplitude of magnetic quantum oscillations in the superconducting state and an unusual angulardependent metal-insulator transition.