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A $^{13}$C NMR study of the normal and superconducting states of theall-organic charge-transfer salt$\beta"$-(BEDT-TTF)$_2$SF$_5$CH$_2$CF$_2$SO$_3$ is presented. We find that thenormal state is a charge-ordered metal configured as vertical stripes, producedby a combination of 1/4-filling, correlations, and a polar counterionsublattice. The NMR properties associated with the superconducting state areconsistent with gap nodes and singlet pairing, and therefore similar to otherorganic superconductors. Quite distinct, however, is the absence of evidencefor low-energy antiferromagnetic spin fluctuations for $T>T_c=4.5$ K. Bothaspects are discussed in the context of a proposal that the pairing in thiscompound is driven by charge fluctuations.

Charge fluctuations and superconductivity in organic conductors: the case of $\beta"$-(BEDT-TTF)$_2$SF$_5$CH$_2$CF$_2$SO$_3$