Abstract
single crystal were studied at 4.2 K in an ultra-high vacuum using scanning tunneling microscopy. Small domains with \(\)×\(\) surface modulation were found adjacent to the flat 2H-type surface with the 3×3 intrinsic charge density wave (CDW). Using tunneling spectroscopy, density of states around the Fermi energy at the domains was found to be lower than that at the 2H-type surface. The \(\)×\(\) modulation is considered to originate from another type of CDW. The observed proximity of superconductivity of 2H-crystal to the highly modulated domain was very small. These results suggest that the crystal structure of the highly-modulated domain is the 4Hd polytype.
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