Unconventional Electrodynamic Response of the Quasi-One-Dimensional Organic Conductor (TMTSF)₂ClO₄

Organic Superconductors: When Correlations and Magnetism Walk in

“…Below this deconfinement temperature charge excitations lose their 1D character and resemble more and more what is expected in Fermi liquids (quasiparticles), leading in turn to a quadratic temperature dependence for the longitudinal resistivity. However, electron excitations of this "Fermi liquid" retain a low energy gap in the far infra-red spectrum in which most of the oscillator strength is carried by states above the gap coexisting with a very narrow and intense zero frequency peak in the conductivity [82,83].…”

Superconductivity and antiferromagnetism in quasi-one-dimensional organic conductors (Review Article)

“…However, the frequency dependence of the optical conductivity is inconsistent with a Drude-like metallic state. 33,34,23 The lowenergy peak carries only 1% of the total spectral weight and is too narrow to be interpreted as a Drude peak with a frequency-independent scattering time. It has been proposed that this peak is due to a collective mode that bears some similarities with the sliding of a charge-density wave -an interpretation supported by the new phonon features that emerge at low temperature.…”

“…It has been proposed that this peak is due to a collective mode that bears some similarities with the sliding of a charge-density wave -an interpretation supported by the new phonon features that emerge at low temperature. 33 Furthermore, 99% of the total spectral weight is found in a finite energy peak around 200 cm −1 . It has been suggested that this peak is a remnant of a 1 4 -filled Mott gap ∆ ρ , observed in the less metallic Fabre salts at ambient pressure.…”

“…24 Besides the presence of spin fluctuations at low temperature, charge fluctuations have also been observed in the normal phase via optical conductivity measurements. 33 …”

“…2.2.). 53,54,33 Within the framework of an extended anisotropic Hubbard model, recent RPA calculations have shown that the triplet f -wave pairing can overcome the singlet d x 2 −y 2 -wave pairing when the intrachain interactions are chosen such as to boost the CDW fluctuations with respect to the SDW ones. 126,127,128 In a half-filled model, this however requires the nearest-neighbor (intrachain) interaction V to exceed U/2.…”