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

A. Pashkin, K. Thirunavukkuarasu, Y. L. Mathis, W. Kang, C. A. Kuntscher

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


We present measurements of the infrared response of the quasi-one-dimensional organic conductor (TMTSF) 2FSO 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) 2X 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.

Original languageEnglish
Pages (from-to)285-290
Number of pages6
JournalEuropean Physical Journal B
Issue number4
StatePublished - Apr 2007


Dive into the research topics of 'Metal-insulator transition in the low-dimensional organic conductor (TMTSF) 2FSO 3 probed by infrared microspectroscopy'. Together they form a unique fingerprint.

Cite this