Infrared study on the formation of charge density waves in (TMTSF) 2X (X = Reo4− and PF6− at atmospheric pressure |
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| Authors: | R Bozio C Pecile K Bechgaard F Wudl D Nalewajek |
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| Institution: | Institute of Physical Chemistry, the University, 2 Via Loredan, I-35100 Padova, Italy;H.C. Oersted Institute, Universitetsparken 5, DK-2100 Copenhagen, Denmark;Bell Laboratories, Murray Hill, New Jersey 07974, U.S.A. |
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| Abstract: | The temperature dependence of the infrared absorption spectra (4000–200 cm?) of (TMTSF) 2Reo4 and (TMTSF) 2PF6 are investigated with the aim at using the appearance of vibronic absorptions originated by electron-molecular vibration interactions to monitor the formation of charge density waves (CDW) on the donor stacks. The presence of vibronic bands at ≈1400, 436 and 264 cm?1 in (TMTSF) 2Re04 below 180 K shows that the anion ordering transition in this salt induces the formation of commensurate CDW. The absence of vibronic bands in the PF6? salt at 8K indicates that no CDW formation nor an underlying 2Kf lattice distortion takes place at the metal-insulator (MI) phase transition. These results show that, at atmospheric pressure both salts do not undergo a conventional Peierls type MI transition. |
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