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.
@article{arxiv.1110.4940,
title = {Lateral imaging of the superconducting vortex lattice using Doppler-modulated scanning tunneling microscopy},
author = {I. Fridman and C. Kloc and C. Petrovic and J. Y. T. Wei},
journal= {arXiv preprint arXiv:1110.4940},
year = {2015}
}
Comments
3 pages, 3 figures, to appear in Applied Physics Letters