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arXiv · 1110.4940

Lateral imaging of the superconducting vortex lattice using Doppler-modulated scanning tunneling microscopy

I. Fridman·C. Kloc·C. Petrovic·J. Y. T. Wei
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Abstract

By spatially mapping the Doppler effect of an in-plane magnetic field on the quasiparticle tunneling spectrum, we have laterally imaged the vortex lattice in superconducting 2H-NbSe2. Cryomagnetic scanning tunneling spectroscopy was performed at 300 mK on the ab-surface oriented parallel to the field H. Conductance images at zero bias show stripe patterns running along H, with the stripe separation varying as H^-0.5. Regions of higher zero-bias conductance show lower gap-edge conductance, consistent with spectral redistribution by spatially-modulated superfluid momentum. Our results are interpreted in terms of the interaction between vortical and screening currents, and demonstrate a general method for probing subsurface vortices.

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I. Fridman, C. Kloc, C. Petrovic, J. Y. T. Wei. 2011-10-22. Lateral imaging of the superconducting vortex lattice using Doppler-modulated scanning tunneling microscopy. https://doi.org/10.1063/1.3659412

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