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We report real-space evidence for an in-plane vortex lattice (VL) transitionin the multiband superconductor 2H-NbSe2, observed by laterally imagingsubsurface vortices with scanning tunneling spectroscopy. With magnetic fieldapplied || ab-surface up to 6.5 T at 300 mK, spatial maps of the zero-biasconductance revealed a stripe pattern whose dominant periodicity showed adiscrete shift near 0.7 T. The stripes can be interpreted as the surfaceprojection of a distorted hexagonal VL that undergoes a first-orderreorientation transition. This transition occurs for field || [100] but not[110], and is correlated with the multigap characteristics seen in the heatcapacity and thermal transport data. These results implicate the multibandpairing of 2H-NbSe2 in the VL transition we observed.

Observation of an in-plane vortex lattice transition in the multiband superconductor 2H-NbSe2 using scanning tunneling spectroscopy