The sliding motion of CDW was investigated with the STM observation in a K0.3MoO3single crystal. For bias current exceeding the threshold value for CDW depinning, sharp peak was found in the spectra of tunneling current with fixing the tunneling tip position. The peak frequency increased with the current carried by the CDW condensate. This peak was explained by the modulation of tunneling current due to the sliding motion of CDW; the sliding motion of CDW at the surface was observed for the first time. The sliding velocity was obtained directly. It was confirmed that the CDW begins to slide at the surface just above the threshold current with much higher velocity than the interior of sample. © 1989.
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