New Superstructure on the Surface of 2H-NbSe2 and Tunneling Spectra at 4.2 K.

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  • Komori Fumio
    Institute for Solid State Physics, The University of Tokyo, Roppongi, Minato–ku, Tokyo 106
  • Iwaki Takao
    Institute for Solid State Physics, The University of Tokyo, Roppongi, Minato–ku, Tokyo 106
  • Hattori Ken
    Institute for Solid State Physics, The University of Tokyo, Roppongi, Minato–ku, Tokyo 106
  • Shiino Osamu
    Faculty of Engineering, The University of Tokyo, Hongo, Bunkyo–ku, Tokyo 113
  • Hasegawa Tetsuya
    Faculty of Engineering, The University of Tokyo, Hongo, Bunkyo–ku, Tokyo 113

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  • New Superstructure on the Surface of 2H
  • New Superstructure on the Surface of 2H-NbSe<b><sub>2</sub></b>and Tunneling Spectra at 4.2 K

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The atomic structure and tunneling spectra of a cleaved surface of a 2H-NbSe2 single crystal were studied by scanning tunneling microscopy at 4.2 K. Small domains with √13 × √13 modulation were found adjacent to the flatsurface with a 3 × 3 intrinsic charge density wave (CDW). The surface atom arrangement in the domains is the same as that in the 2H-type surface.The density of states around the Fermi energy was measured at the domains by tunneling spectroscopy, and found to be lower than that at the 2H-type surface. The √13 × √13 modulation is considered to originate from another CDW, which can be expected to occur in 4H-NbSe2 clusters buried in a 2H-type crystal. The change of the tunneling spectrum across the boundary between the 2H-typesurface and a √13 × √13 modulated domain was also measured, and the proximity of superconductivity of 2H type to the modulated domain is discussed.

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