Electrodynamics of Bechgaard Salts: Optical Properties of One-Dimensional Metals
Figure 15
Frequency-dependent conductivity of measured above and below the spin-density-wave transition at K. The single-particle gap around 30 obtained from dc measurements is indicated by the arrow. The Drude-like conductivity collapses in the insulating state, but there remains a finite frequency pinned-mode resonance ascribed to the collective spin-density-wave excitation (reproduced from [42]).
