Effect of Fe-doping on CDW state in 1T-TaS2 investigated by STM/STS

Y. Fujisawa, T. Shimabukuro, H. Kojima, K. Kobayashi, S. Demura, H. Sakata

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3 Citations (Scopus)


1T-TaS2 has been known to undergo Mott transition from nearly commensurate charge density wave (CDW) state to commensurate CDW state at about 200 K. Recently, Fe doping was found to suppress the Mott transition and induce superconductivity. In this study, we report on the scanning tunneling microscopy (STM) and spectroscopy (STS) study on Fe doped 1T-TaS2 with different Fe concentration. STM observations reveal that the CDW superlattice becomes irregular as increasing Fe concentration. STS measurements uncover the spatial change in the local density of state (LDOS). We find two types of David-star: one has symmetric LDOS with respect to Fermi energy, and the other has asymmetric one. We identify that the asymmetric spectrum is due to an Fe dopant.

Original languageEnglish
Article number012003
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 26 Jul 2017
Externally publishedYes
Event29th International Symposium on Superconductivity, ISS 2016 - Tokyo, Japan
Duration: 13 Dec 201615 Dec 2016


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