Optical and infrared properties of tetramethyltetraselenafulvalene [(TMTSF)2X] and tetramethyltetrathiafulvalene [(

Abstract

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Theory of the ferroelectric phase in organic conductors: From physics of solitons to optics

“…[27,28,29], the optical absorption edge is not a two particle gap E g = 2∆ but rather the collective mode gaped at ω t ≈ πγ∆ < 2∆. (Here and below we simplify some relations as for γ ≪ 1, see [20].)…”

One Dimensional Organic Superconductors

“…at decreasing temperatures from top to bottom with the light polarized along a or the b' transverse axis. A transverse plasma edge is observed at low temperature [56].…”

“…An other striking feature of the optical conductivity has been noticed when the Kramers-Krönig transformation of the reflectance is performed in a broad frequency domain for between transport lifetime and plasma frequency data (the plasma frequency has been found nearly temperature independent [88,56]) and the measured resistance ratio for a ρ of about 800 between RT and 2K obtained in good quality measurements, the Drude conductivity in the frequency range SbF as an evidence for a hidden zero frequency mode. This mode is actually so narrow that it escapes a direct determination from K-K analysis of the reflectance which is limited to the frequency domain above [90].…”

“…, a plasma edge for a light polarized along the transverse b-axis becomes observable only below 100K [55,56] and therefore suppresses the relevance of 1 -D physics restricted to the high temperature limit, see fig.10. The situation is more delicate for 6 …”

“…The confirmation of a very long scattering time for the DC conduction has also been brought by the rapid suppression of Tc by non-magnetic defects in the non conventional superconductor at low temperature [91] meaning that the electron lifetime at low temperature is actually much longer than the value inferred from a Drude description. , it has also been shown that the narrow mode carries only a small fraction (a few percent) of the total spectral weight [83,56] but it is this mode which explains the very large value of the DC conduction observed at low temperature [47].…”