Abstract
In the extensive experimental study of the sulphur (TMTTF)2X and the selenide (TMTSF)2X (the Bechgaard salts) series of organic conductors with the anions X=PF6, AsF6, Br, C104, .., it soon became apparent that there is unity in their properties and therefore in the complex mechanisms at the origin of their rich variety of phase transitions.1–3 At ambient pressure, depending on the anion X or the organic stack, either a spin-Peierls (SP) or an Antiferromagnetic (AF) or finally a superconducting phase transition is observed.1,4 At this pressure, the SP state is only stabilized5 for the sulphur compounds (TMTTF)2PF6 and (TMTTF)2AsF6 whereas the superconducting phase has been detected exclusively for the slow cooled Bechgaard salt (TMTSF)2C104.4 The AF state however, is observed in the same conditions for many different compounds of both series.
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