CHARGE-DENSITY-WAVE PARACONDUCTIVITY IN K0.3MOO3

The dynamic conductivity has been measured in K0.3MoO3 single crystals in the conducting phase (above 180 K), for the first time over a broad frequency range 1-10(5) cm-1, using a combination of different spectroscopic techniques. Together with a pseudogap, clearly pronounced excitations are observed below 50 cm-1 for E over arrow pointing right parallel-to b, the direction along which the charge density wave develops. We associate these excitations with charge-density-wave fluctuations which exist even at room temperature and give a collective contribution to the conductivity. For the transverse polarization, E over arrow pointing right perpendicular-to b, a usual single-particle Drude behavior of the conductivity is observed.