Abstract
The scanning tunneling microscope (STM) has been used to study the effects of Fe doping on the charge-density wave (CDW) structure in NbSe 3 and IT-TaS 2. In NbSe 3 small amounts of Fe reduce both CDW gaps by 25%–30% and change the relative CDW amplitudes of the high- and low-temperature CDWs. The CDW amplitudes remain strong on all three chains of the surface commensurate transition is removed. The STM in both the image and spectroscopy modes can detect subtle changes in CDW structure due to impurities.
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