Vortex pinning of Ba 0.62 K 0.38 BiO 3 investigated by magneto-optical Kerr-effect and magnetization measurements
This study investigated vortex pinning in Ba1–xKxBiO3 (BKBO) using magneto-optical Kerr effect (MOKE) and magnetization measurements. The research found that zero-field MOKE signals show magnetic history dependence matching trapped vortices, which is well described by Bean’s critical-state model. This confirms MOKE as a viable optical probe for studying vortex pinning in this superconductor.