Abstract
In this work, we explain the ingredients of a model for a semi-quantitative analysis of the large variety of phase transitions observed in the two similar families of organic compounds (TMTTF) 2X and (TMTSF) 2X (X=PF 6, AsF 6, Br, TaF 6 …). We find that the sequence of magnetic transitions in the (TMTTF) 2X family up to moderate pressure are dominated by significant changes in the one-dimensional (1D) or intrachain correlations of the 1D electron and electron-phonon systems. These 1D effects are stabilized by the interchain pair tunneling processes generated by the single-particle hopping. In the (TMTSF) 2X family, however, these interchain interactions significantly decrease the range in temperature (T<T X 1) in which there is 3D nesting while contributing to the superconductivity pairing interaction below the crossover temperature (T X 1).
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