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Flux Distribution In Fe-Based Superconducting Materials By Magneto-Optical Imaging, Zhi Wei Lin, Jian Guo Zhu, You Guang Guo, Xiaolin Wang, S X. Dou, Tom H. Johansen, Xun Shi, K Y. Choi

Australian Institute for Innovative Materials - Papers

"This paper presents the magnetic flux distributions in Fe-based superconducting materials including single crystal of Ba(Fe_1.9Ni_0.1)As₂ and Ba(Fe_1.8Co_0.2)As₂, as well as polycrystalline SmFeO_0.75F_0.2As by means of magneto-optical imaging (MOI) technique. The single crystals were grown out of FeAs flux while polycrystalline sample was grown by hot-press. A MOI film with in-plan magnetization was used to visualize flux distributions at the sample surface. A series of magneto-optical images was taken when the samples were zero-field cooled and field cooled. The flux behavior, including penetration into and …