Charge-density waves observed with a tunneling microscope

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Abstract
Charge-density waves on cleaved surfaces of 1T-TaS2 appeared at 77 K as hexagonal arrays of mounds with spacings of (3.5±0.3)a0, where a0=3.346 Å is the lattice spacing of the 1T-TaS2. In contrast, cleaved surfaces of 2H-TaSe2 at 77 K showed only atoms. The tunneling microscope was operated under liquid nitrogen with a Pt0.8 Ir0.2 tip for both types of samples.

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