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    • Keywords


      Proximity effect; density of states; Andreev reflection

    • Abstract


      In contact with a superconductor, the Andreev reflection of the electrons locally modifies the N metal electronic properties, including the local density of states (LDOS). We investigated the LDOS in superconductor-normal metal (Nb-Au) bilayers using a very low temperature (60 mK) STM on the normal metal side. High resolution tunneling spectra measured on the Au surface show a clear proximity effect with an energy gap of reduced amplitude compared to the bulk Nb gap. The dependence of this mini-gap width with the normal metal thickness is discussed in terms of the Thouless energy. Within the mini-gap, the density of states does not reach zero and shows clear sub-gap features. We compare the experimental spectra with the well-established quasi-classical theory.

    • Author Affiliations


      A K Gupta1 L Crétinon2 B Pannetier2 H Courtois2

      1. Department of Physics, Indian Institute of Technology Kanpur, Kanpur - 208 016, India
      2. Centre de Recherches sur les Très Basses Températures, C.N.R.S. associé à l’Université Joseph Fourier, 25 Avenue des Martyrs, Grenoble - 38042, France
    • Dates

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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