Josephson Effect in Pb/I/NbSe2 Scanning Tunneling Microscope Junctions

Abstract

We have developed a method for the reproducible fabrication of superconducting scanning tunneling microscope (STM) tips. We use these tips to form superconductor/insulator/superconductor tunnel junctions with the STM tip as one of the electrodes. We show that such junctions exhibit fluctuation dominated Josephson effects, and describe how the Josephson product IcRn can be inferred from the junctions' tunneling characteristics in this regime. This is first demonstrated for tunneling into Pb films, and then applied in studies of single crystals of NbSe2. We find that in NbSe2, IcRn is lower than expected, which could be attributed to the interplay between superconductivity and the coexisting charge density wave in this material.

3 pages, 2 figures. Presented at the New3SC-4 meeting, San Diego, Jan. 16-21 2003

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• Subharmonic gap structure in superconducting scanning tunneling microscope junctions
• Friedel oscillations and Majorana zero modes in inhomogeneous superconductors
• Josephson Effect in NbS${}_2$ van der Waals Junctions
• Josephson scanning tunneling microscopy: A local and direct probe of the superconducting order parameter