Correlating Josephson supercurrents and Shiba states in quantum spins unconventionally coupled to superconductors.

ABSTRACT: Local spins coupled to superconductors give rise to several emerging phenomena directly linked to the competition between Cooper pair formation and magnetic exchange. These effects are generally scrutinized using a spectroscopic approach which relies on detecting the in-gap bound modes arising from Cooper pair breaking, the so-called Yu-Shiba-Rusinov (YSR) states. However, the impact of local magnetic impurities on the superconducting order parameter remains largely unexplored. Here, we use scanning Josephson spectroscopy to directly visualize the effect of magnetic perturbations on Cooper pair tunneling between superconducting electrodes at the atomic scale. By increasing the magnetic impurity orbital occupation by adding one electron at a time, we reveal the existence of a direct correla

SUBMITTER: Kuster F 

PROVIDER: S-EPMC7889868 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature