London penetration depth of electron-irradiated Ba0.47K0.53Fe2As2

• Published in: Physica. C, Superconductivity Superconductivity, 2023-10, Vol.613, Article 1354347
• Main Authors: Gierłowski, P., Cury Camargo, B., Abaloszewa, I., Abaloszew, A., Jaworski, M., Cho, K., Prozorov, R., Liu, Y., Lograsso, T.A., Konczykowski, M.
• Format: Article
• Language: English
• Subjects: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Electron-irradiation; Iron-based superconductors; Microwave penetration depth; Superconductivity; Uemura relation
• ISSN: 0921-4534; 1873-2143
• DOI: 10.1016/j.physc.2023.1354347

We have characterized an electron-irradiated Ba0.47K0.53Fe2As2 single-crystal using two different techniques: magneto-optic and microwave measurements. The crystal has been measured before as well as after the 2.5 MeV electron irradiation process. After irradiation it was annealed in a number of steps, between 90 °C and 180 °C. At each step, we employ a resonant microwave cavity technique to determine the London penetration depth changes δλab and δλc of the sample. Equations based on perturbation theory were derived to calculate δλab and δλc for a rectangular prism geometry. A procedure to correct the magneto-optic measurements was introduced. We have demonstrated that the superconducting properties of Ba0.47K0.53Fe2As2, degraded by intense electron beam irradiation, can be restored by a simple annealing procedure and the corresponding Uemura plot is in the vicinity of data for hole-doped copper oxides. •Uemura plot of 122 BaKFe2As2 superconductor.•Magneto-optic technique.•Microwave cavity measurements of TE- and TM-modes.