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

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

2011-10-22

arxiv.org/abs/1110.4940v1

Physics

Condensed Matter

Superconductivity

3 pages, 3 figures, to appear in Applied Physics Letters

Scientific paper

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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