Various techniques have been applied to visualize superconducting vortices, providing clues to their electromagnetic response. Here, we present a wide-field, quantitative imaging of the stray field of the vortices in a superconducting thin film using perfectly aligned diamond quantum sensors. Our analysis, which mitigates the influence of the sensor inhomogeneities, visualizes the magnetic flux of single vortices in YBa₂Cu₃O_7−δ with an accuracy of ±10%. The obtained vortex shape is consistent with the theoretical model, and penetration depth and its temperature dependence agree with previous studies, proving our technique's accuracy and broad applicability. This wide-field imaging, which in principle works even under extreme conditions, allows the characterization of various superconductors.

See below for more information.

• Aritcle URL : https://pubs.aip.org/aip/apl/article/123/11/112603/2911530/Wide-field-quantitative-magnetic-imaging-of
• Kobayashi Lab. : https://meso.phys.s.u-tokyo.ac.jp/en/