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Pseudogap in a thin film of a conventional superconductor

Author

Listed:
  • Benjamin Sacépé

    (SPSMS, UMR-E 9001, CEA-INAC/UJF-Grenoble 1
    Present address: Institut Néel, CNRS & Université Joseph Fourier, BP 166, 38042 Grenoble Cedex 9, France.)

  • Claude Chapelier

    (SPSMS, UMR-E 9001, CEA-INAC/UJF-Grenoble 1)

  • Tatyana I. Baturina

    (A.V. Rzhanov Institute of Semiconductor Physics SB RAS)

  • Valerii M. Vinokur

    (Argonne National Laboratory)

  • Mikhail R. Baklanov

    (IMEC Kapeldreef 75)

  • Marc Sanquer

    (SPSMS, UMR-E 9001, CEA-INAC/UJF-Grenoble 1)

Abstract

A superconducting state is characterized by the gap in the electronic density of states, which vanishes at the superconducting transition temperature Tc. It was discovered that in high-temperature superconductors, a noticeable depression in the density of states, the pseudogap, still remains even at temperatures above Tc. Here, we show that a pseudogap exists in a conventional superconductor, ultrathin titanium nitride films, over a wide range of temperatures above Tc. Our study reveals that this pseudogap state is induced by superconducting fluctuations and favoured by two-dimensionality and by the proximity to the transition to the insulating state. A general character of the observed phenomenon provides a powerful tool to discriminate between fluctuations as the origin of the pseudogap state and other contributions in the layered high-temperature superconductor compounds.

Suggested Citation

  • Benjamin Sacépé & Claude Chapelier & Tatyana I. Baturina & Valerii M. Vinokur & Mikhail R. Baklanov & Marc Sanquer, 2010. "Pseudogap in a thin film of a conventional superconductor," Nature Communications, Nature, vol. 1(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:1:y:2010:i:1:d:10.1038_ncomms1140
    DOI: 10.1038/ncomms1140
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