2002/05/31 by Alexey V. Pan, Alexey V Pan, Sihai Zhou +3
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #cond-mat.supr-con
paper · pdf · doi:10.1088/0953-2048/16/10/101
published as Supercond. Sci. Technol. 16, L33-L36 (2003) · 4 pages, 3 figures
arxiv created 2003/06/03 · openalex publication_date 2003/09/09 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
Local magneto-optical imaging and global magnetization measurement techniques were used in order to visualize shielding effects in the superconducting core of MgB 2 wires sheathed by ferromagnetic iron (Fe). The magnetic shielding can provide a Meissner-like state in the superconducting core in applied magnetic fields up to ∼1 T. The maximum shielding fields are shown to correlate with the saturation fields of magnetization in Fe-sheaths. The shielding has been found to facilitate the appearance of an overcritical state, which is capable of achieving a critical current density ( J c ) in the core which is larger than J c in the same wire without the sheath by a factor of ∼2. Other effects caused by the magnetic interaction between the sheath and the superconducting core are discussed.