Abstract
The low temperature electronic properties in organic conductors are often dependent on high temperature structural transitions in which the pressure may play an important role. As a consequence, high resolution thermal expansion gives some important information on the coupling between the lattice and other physical properties. In the (TMTSF) 2X series, we are able to extract (by comparison with the centrosymmetric X = PF 6 case) the anion ordering part of the thermal expansion below 24 K for X = C10 4. This contribution is exactly proportional to the superstructure peak intensity as expected from simple models. We have also investigated β-(BEDT-TTF) 2I 3 between helium and room temperature. We clearly observe the signature of the structural phase transition around 172 K and we discuss the influence of strains in the stabilisation of the high-T c phase.
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