Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Metal-insulator transition in the low-dimensional organic conductor
  (TMTSF)2FSO3 probed by infrared microspectroscopy   We present measurements of the infrared response of the quasi-one-dimensional
organic conductor (TMTSF)2$SO3 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. Also we 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 FSO3 anion is proposed, in order to explain the anomalous behavior of
the new mode.

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The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int