Successive Dimensional Transition in (TMTTF)2PF6 Revealed by Synchrotron X-ray Diffraction

Shunsuke Kitou, Tatsuya Fujii, Tadashi Kawamoto, Naoyuki Katayama, Sachiko Maki, Eiji Nishibori, Kunihisa Sugimoto, Masaki Takata, Toshikazu Nakamura, Hiroshi Sawa

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    24 Citations (Scopus)


    A quasi-one-dimensional organic charge-transfer salt (TMTTF)2PF6 undergoes a multistep phase transition as the temperature decreases. One of these transitions is called a "structureless transition," and these detailed structures were unknown for many years. With synchrotron x-ray diffraction, we observed a slight structural difference owing to the effect of charge-order transition between two TMTTF molecules in a dimer, which corresponds to the charge transfer δCO=0.20e. The two-dimensional Wigner crystallization was determined from an electron density analysis using core differential Fourier synthesis. Furthermore, we found that the ground state due to tetramerization, called the spin Peierls phase, is a three-dimensional transition with interchain correlation.

    Original languageEnglish
    Article number065701
    JournalPhysical review letters
    Issue number6
    Publication statusPublished - 2017 Aug 7

    ASJC Scopus subject areas

    • Physics and Astronomy(all)


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