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We have developed a method for the reproducible fabrication ofsuperconducting scanning tunneling microscope (STM) tips. We use these tips toform superconductor/insulator/superconductor tunnel junctions with the STM tipas one of the electrodes. We show that such junctions exhibit fluctuationdominated Josephson effects, and describe how the Josephson product IcRn can beinferred from the junctions' tunneling characteristics in this regime. This isfirst demonstrated for tunneling into Pb films, and then applied in studies ofsingle crystals of NbSe2. We find that in NbSe2, IcRn is lower than expected,which could be attributed to the interplay between superconductivity and thecoexisting charge density wave in this material.Comment: 3 pages, 2 figures. Presented at the New3SC-4 meeting, San Diego,  Jan. 16-21 200

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

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