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

Title
Metal-insulator transition in the low-dimensional organic conductor (TMTSF) 2FSO 3 probed by infrared microspectroscopy
Authors
Pashkin A.Thirunavukkuarasu K.Mathis Y.-L.Kang W.Kuntscher C.A.
Ewha Authors
강원
SCOPUS Author ID
강원scopus
Issue Date
2007
Journal Title
European Physical Journal B
ISSN
1434-6028JCR Link
Citation
vol. 56, no. 4, pp. 285 - 290
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
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. © EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007.
DOI
10.1140/epjb/e2007-00121-8
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자연과학대학 > 물리학전공 > Journal papers
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