2022/08/29 by P. Gierlowski, Gierlowski, P., Bruno Cury Camargo +13
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Iron-based superconductors research #Magnetic and transport properties of perovskites and related materials #Rare-earth and actinide compounds #Superconductivity (cond-mat.supr-con)
paper · pdf · doi:10.48550/arxiv.2208.13577
openalex publication_date 2022/08/29 · openalex created_date 2022/08/31 · openalex updated_date 2026/07/28
We have characterized an electron-irradiated Ba1-xKxFe2As2 (x = 0.53) single-crystal using two different experimental techniques: magneto-optic measurements 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 deg C and 180 deg C, and measured after each annealing step. Most microwave measurements were performed by means of a copper cavity, taking advantage of the TE011 and TM110 modes, allowing for the determination of the London penetration depths changes δλab(T) and δλc(T), i.e. perpendicular and parallel to the sample c-axis. Appropriate equations, based on perturbation theory, were derived to calculate the penetration depths changes δλab and δλc for a rectangular prism geometry. The sample showed a full recovery of its Tc, however the observed behavior of δλc and δλab was not monotonic vs annealing temperature, displaying a minimum of δλc and δλab at 120 deg C. This finding was confirmed by magneto-optic measurements, where besides verifying the sample uniformity and the absence of visible defects, the lower critical field Hc1 of the Ba1-xKxFe2As2 single-crystal was obtained and the London penetration depth λab(0) was calculated.