Abstract
Scanning tunneling microscopy has been used to investigate the effects of hafnium impurities on the charge density wave (CDW) state in 1 T-TaS 2 at room temperature. The STM images have shown that Hf atom strongly affects the CDW state to destroy its long range order and the CDW state has changed to a characteristic one, which has a parallel-line structure in small regions. It suggests that the CDW state has become a single- q CDW state from a triple- q CDW state in the regions due to the strong pinning by Hf.
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