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

Author

Listed:
  • A. Pashkin
  • K. Thirunavukkuarasu
  • Y.-L. Mathis
  • W. Kang
  • C. A. Kuntscher

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

Suggested Citation

  • A. Pashkin & K. Thirunavukkuarasu & Y.-L. Mathis & W. Kang & C. A. Kuntscher, 2007. "Metal-insulator transition in the low-dimensional organic conductor (TMTSF) 2 FSO 3 probed by infrared microspectroscopy," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 56(4), pages 285-290, April.
    • Handle: RePEc:spr:eurphb:v:56:y:2007:i:4:p:285-290
    DOI: 10.1140/epjb/e2007-00121-8
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