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Incommensurate lattice fluctuations are present in the beta_L phase (T_c =1.5 K) of ET_2I_3 (where ET is BEDT-TTF -bis(ethylenedithio)tetrathiafulvalene) but are absent in the beta_H phase (T_c= 7 K). We propose that the disorder in the conformational degrees of freedomof the terminal ethylene groups of the ET molecules, which is required tostabilise the lattice fluctuations, increases the quasiparticle scattering rateand that this leads to the observed difference in the superconducting criticaltemperatures, T_c, of the two phases. We calculate the dependence of T_c on theinterlayer residual resistivity. Our theory has no free parameters. Ourpredictions are shown to be consistent with experiment. We describe experimentsto conclusively test our hypothesis.Comment: 4 pages, 1 figur

journal de physique. iv/journal de physique. iv-proceedings

The origin of the difference in the superconducting critical temperatures of the βHand βLphases of (BEDT-TTF)2I3