We report a reproducible technique for the fabrication of sharp superconducting Nb tips for scanning tunneling microscopy (STM) and scanning tunneling spectroscopy. Sections of Nb wire with 250 μm diameter are dry etched in an SF6 plasma in a Reactive Ion Etcher. The gas pressure, etching time and applied power are chosen to produce a self-sharpening effect to obtain the desired tip shape. The resulting tips are atomically sharp, with radii of less than 100 nm, and generate good STM images and spectroscopy on single crystal samples of Au(111), Au(100), and Nb(100), as well as a doped topological insulator Bi2Se3 at temperatures ranging from 30 mK to 9 K.
@article{arxiv.1404.5370,
title = {Plasma etching of superconducting Niobium tips for scanning tunneling microscopy},
author = {A. Roychowdhury and R. Dana and M. Dreyer and J. R. Anderson and C. J. Lobb and F. C. Wellstood},
journal= {arXiv preprint arXiv:1404.5370},
year = {2015}
}
Comments
See supplemental file for conductance map linked to Fig. 5(b)