Metal-insulator transition in the low-dimensional organic conductor (TMTSF) 2 FSO 3 probed by infrared microspectroscopy

A. Pashkin (), K. Thirunavukkuarasu, Y.-L. Mathis, W. Kang and C. A. Kuntscher ()

The European Physical Journal B: Condensed Matter and Complex Systems, 2007, vol. 56, issue 4, 285-290

Abstract: We present measurements of the infrared response of the quasi-one-dimensional organic conductor (TMTSF) 2 FSO 3 along ( E $\|a$ ) and perpendicular ( E $\|b'$ ) to the stacking axis as a function of temperature. Above the metal-insulator transition related to the anion ordering the optical conductivity spectra show a Drude-like response. Below the transition an energy gap of about 1500 cm -1 (185 meV) opens, leading to the corresponding charge transfer band in the optical conductivity spectra. The analysis of the infrared-active vibrations gives evidence for the long-range crystal structure modulation below the transition temperature and for the short-range order fluctuations of the lattice modulation above the transition temperature. We also report about a new infrared mode at around 710 cm-1 with a peculiar temperature behavior, which has so far not been observed in any other (TMTSF) 2 X salt showing a metal-insulator transition. A qualitative model based on the coupling between the TMTSF molecule vibration and the reorientation of electrical dipole moment of the FSO 3 anion is proposed, in order to explain the anomalous behavior of this new mode. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Keywords: 71.30.+h Metal-insulator transitions and other electronic transitions; 74.70.Kn Organic superconductors; 78.30.-j Infrared and Raman spectra (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1140/epjb/e2007-00121-8

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