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We introduce a mode of operation for studying the vortex phase insuperconductors using scanning tunnelling microscopy (STM). While in theconventional STM method, the tip is scanned over a sample in which a fixedvortex pattern is prepared, in our "Lazy Fisherman" method the STM tip is keptfixed at a selected location while the vortices are being moved by varying theapplied magnetic field. By continuously acquiring the local tunnellingconductance spectra, dI/dV(V), we detect the changes in the local density ofstates under the tip due to the vortex motion. With no need for scanning, themethod permits one to extend the study of vortices to samples in which scanningis difficult or even impossible due to surface nonuniformity and allows one tostudy vortex dynamics. Using a statistical analysis of the spectra, wereconstruct the single vortex zero bias conductance profile. We apply themethod to the c-axis face of an MgB$_2$ single crystal sample and obtain avortex profile with a coherence length, xi of 57+-2 nm.

Superconducting vortex profile from fixed point measurements the “Lazy Fisherman” tunneling microscopy method