IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Nanometer Structures Tuesday Sessions
       Session NS-TuA

Paper NS-TuA3
Tunneling Spectroscopy of Superconducting Quasiparticles by Scanning Tunneling Microscope with a Bulk NbN Tip

Tuesday, October 30, 2001, 2:40 pm, Room 133

Session: Novel Surface Nanoprobes
Presenter: H. Bando, National Institute of Advanced Industrial Science and Technology, Japan
Authors: H. Bando, National Institute of Advanced Industrial Science and Technology, Japan
Y. Aiura, National Institute of Advanced Industrial Science and Technology, Japan
K. Mitsugi, National Institute of Advanced Industrial Science and Technology, Japan
K. Oguchi, Ibaraki University, Japan
Y. Nishihara, Ibaraki University, Japan
Y. Kumashiro, Yokohama National University, Japan
Correspondent: Click to Email
Use of superconducting tip is expected to extend the capability of scanning tunneling microsopy by allowing detection of superconducting quasiparticles in the atomic resolution. A few groups have succeeded in the measurements with supercunducting tips made of Nb or Ag/Pb coated PtIr, however, technically there remain challenges as for the cleaning of tip apex etc. We employed bulk NbN crystals, whose surface is chemically stable, and prepared tips by fracuture. Results of topographic measurements, SIN tunneling on Au, and SIS' tunneling on NbN films with the tunneling resistance varied for orders of magnitute are presented.