“…In order to investigate the competition between the SP and AF states theoretically, Kondo and Kinoshita [7], Kondo [8], Inagaki and Fukuyama [9], and Caron et al [10] investigated models within classical treatment of phonon and obtained a first-order phase transition between the SP state and the AF state. However, it seems that such a transition is different from that observed experimentally in the ðTMTTFÞ 2 PF 6 [2].…”