Nitrogen Vacancy Center Optical Magnetometry of a Barium-Iron-Cobalt Superconductor

Authors

William Setterberg, Macalester CollegeFollow

Abstract

Experimentally probing the intrinsic properties of superconductors—such as the London penetration depth λ and the critical fields H_c1 and H_c2—poses a difficult task. Various sample- and measurement-related factors can impact the efficacy of results obtained for λ or H_c1, such as perturbations to the magnetic properties of a superconducting sample or crystalline defects. One measurement technique that can minimize the impact of both of these issues is known as Nitrogen Vacancy (NV) center magnetometry. In this work, we use NV center magnetometry to perform minimally-invasive measurements of the lower critical field H_c1 and the London penetration depth λ on a sample of Ba(Fe_1−xCo_x)₂As₂, x = 7.4% (BaCo122).

Streaming Media

Recommended Citation

Setterberg, William (2020) "Nitrogen Vacancy Center Optical Magnetometry of a Barium-Iron-Cobalt Superconductor," Macalester Journal of Physics and Astronomy: Vol. 8: Iss. 1, Article 15.
Available at: https://digitalcommons.macalester.edu/mjpa/vol8/iss1/15