Scanning tunneling spectroscopy under large current flow through the sample

Maldonado, A.; Guillamón, I.; Suderow, H.; Vieira, S.
July 2011
Review of Scientific Instruments;Jul2011, Vol. 82 Issue 7, p073710
Academic Journal
We describe a method to make scanning tunneling microscopy/spectroscopy imaging at very low temperatures while driving a constant electric current up to some tens of mA through the sample. It gives a new local probe, which we term current driven scanning tunneling microscopy/spectroscopy . We show spectroscopic and topographic measurements under the application of a current in superconducting Al and NbSe2 at 100 mK. Perspective of applications of this local imaging method includes local vortex motion experiments, and Doppler shift local density of states studies.


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