Abstract
We report microwave surface impedance measurements performed in the relaxed state of the quasi-one-dimensional organic conductor $(\mathrm{TMTSF}{)}_{2}{\mathrm{ClO}}_{4}$ at 16.5 GHz in a magnetic field applied along the hard axis ${(c}^{*})$ direction. The transition from the metallic to the field-induced spin-density-wave (FISDW) state is not as sharp as it is generally observed in the dc regime, but the phase diagram is in very good agreement with existing data. An enhanced ac conductivity is measured in the FISDW phases, which should reflect the contribution of the collective mode. The rapid oscillations of the microwave magnetoresistivity appear in both the metallic state and/or in the FISDW phase. The deduced frequency (260 T) and the temperature dependence of the rapid oscillation amplitude in the normal and condensed states are consistent with reported dc results. A frequency dampening of the amplitude that is different in the two phases is, however, observed compared to dc data; its possible origin is discussed and confirms the different origin of the two mechanisms.
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