Scanning tunnelling spectroscopy of the vortex state in NbSe2 using a superconducting tip

TL;DR

This study employs superconducting tip scanning tunneling spectroscopy to investigate vortex electronic structures in NbSe2, revealing enhanced spectral features and enabling detailed imaging of vortex core states and Josephson currents.

Contribution

It introduces the use of a superconducting tip in STS to improve the observation of vortex states in NbSe2, providing richer spectral information and new imaging capabilities.

Findings

Enhanced features in tunneling conductance due to superconducting tip

Observation of complex electronic patterns around vortex cores

Simultaneous imaging of Josephson currents in vortex state

Abstract

The vortex electronic structure in the multiband superconductor NbSe2 is studied by means of Scanning Tunneling Spectroscopy (STS) using a superconducting tip. The use of a superconducting tip (Pb) as a probe provides an enhancement of the different features related to the DOS of NbSe2 in the tunneling conductance curves. This use allows the observation of rich patterns of electronic states in the conductance images around the vortex cores in a wide range of temperature, as well as the simultaneous acquisition of Josephson current images in the vortex state.