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On the use of STM superconducting tips at very low temperatures

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  • J. Rodrigo
  • H. Suderow
  • S. Vieira

Abstract

We report on high quality local tunnel spectroscopy measurements in superconductors using in-situ fabricated superconducting tips as counterelectrode. The experiments were made at very low temperatures using a dilution refrigerator and a 3 He cryostat. Spectra obtained with superconducting tip and sample of Al show that the spectroscopic resolution of our set-up is of 15 μeV. Following the observation of Josephson current in tunnelling regime (with tips of Pb and of Al), we discuss the feasibility of Scanning Josephson Spectroscopy with atomic size resolution. Experiments showing new applications of these superconducting tips under applied external magnetic fields are also reported. Copyright Springer-Verlag Berlin/Heidelberg 2004

Suggested Citation

  • J. Rodrigo & H. Suderow & S. Vieira, 2004. "On the use of STM superconducting tips at very low temperatures," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 40(4), pages 483-488, August.
    • Handle: RePEc:spr:eurphb:v:40:y:2004:i:4:p:483-488
    DOI: 10.1140/epjb/e2004-00273-y
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